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same, a physical rotation (movement) of −45° is not the same as a rotation of 315° (for example, the rotation of a person holding a broom resting on a dusty floor would leave visually different traces of swept regions on the floor). In three-dimensional geometry, "clockwise" and "anticlockwise" have no absolute meaning, so the direction of positive and negative angles must be defined relative to some reference, which is typically a vector passing through the angle's vertex and perpendicular to the plane in which the rays of the angle lie. In navigation, bearings or azimuth are measured relative to north. By convention, viewed from above, bearing angles are positive clockwise, so a bearing of 45° corresponds to a north-east orientation. Negative bearings are not used in navigation, so a north-west orientation corresponds to a bearing of 315°. Alternative ways of measuring the size of an angle There are several alternatives to measuring the size of an angle by the angle of rotation. The slope or gradient is equal to the tangent of the angle, or sometimes (rarely) the sine; a gradient is often expressed as a percentage. For very small values (less than 5%), the grade of a slope is approximately the measure of the angle in radians. In rational geometry the spread between two lines is defined as the square of the sine of the angle between the lines. As the sine of an angle and the sine of its supplementary angle are the same, any angle of rotation that maps one of the lines into the other leads to the same value for the spread between the lines. Astronomical approximations Astronomers measure angular separation of objects in degrees from their point of observation. 0.5° is approximately the width of the sun or moon. 1° is approximately the width of a little finger at arm's length. 10° is approximately the width of a closed fist at arm's length. 20° is approximately the width of a handspan at arm's length. These measurements clearly depend on the individual subject, and the above should be treated as rough rule of thumb approximations only. In astronomy, right ascension and declination are usually measured in angular units, expressed in terms of time, based on a 24-hour day. Measurements that are not angular units Not all angle measurements are angular units, for an angular measurement, it is definitional that the angle addition postulate holds. Some angle measurements where the angle addition postulate does not hold include: Trigonometric functions Slope Angles between curves The angle between a line and a curve (mixed angle) or between two intersecting curves (curvilinear angle) is defined to be the angle between the tangents at the point of intersection. Various names (now rarely, if ever, used) have been given to particular cases:—amphicyrtic (Gr. , on both sides, κυρτός, convex) or cissoidal (Gr. κισσός, ivy), biconvex; xystroidal or sistroidal (Gr. ξυστρίς, a tool for scraping), concavo-convex; amphicoelic (Gr. κοίλη, a hollow) or angulus lunularis, biconcave. Bisecting and trisecting angles The ancient Greek mathematicians knew how to bisect an angle (divide it into two angles of equal measure) using only a compass and straightedge, but could only trisect certain angles. In 1837, Pierre Wantzel showed that for most angles this construction cannot be performed. Dot product and generalisations In the Euclidean space, the angle θ between two Euclidean vectors u and v is related to their dot product and their lengths by the formula This formula supplies an easy method to find the angle between two planes (or curved surfaces) from their normal vectors and between skew lines from their vector equations. Inner product To define angles in an abstract real inner product space, we replace the Euclidean dot product ( · ) by the inner product , i.e. In a complex inner product space, the expression for the cosine above may give non-real values, so it is replaced with or, more commonly, using the absolute value, with The latter definition ignores the direction of the vectors and thus describes the angle between one-dimensional subspaces and spanned by the vectors and correspondingly. Angles between subspaces The definition of the angle between one-dimensional subspaces and given by in a Hilbert space can be extended to subspaces of any finite dimensions. Given two subspaces , with , this leads to a definition of angles called canonical or principal angles between subspaces. Angles in Riemannian geometry In Riemannian geometry, the metric tensor is used to define the angle between two tangents. Where U and V are tangent vectors and gij are the components of the metric tensor G, Hyperbolic angle A hyperbolic angle is an argument of a hyperbolic function just as the circular angle is the argument of a circular function. The comparison can be visualized as the size of the openings of a hyperbolic sector and a circular sector since the areas of these sectors correspond to the angle magnitudes in each case. Unlike the circular angle, the hyperbolic angle is unbounded. When the circular and hyperbolic functions are viewed as infinite series in their angle argument, the circular ones are just alternating series forms of the hyperbolic functions. This weaving of the two types of angle and function was explained by Leonhard Euler in Introduction to the Analysis of the Infinite. Angles in geography and astronomy In geography, the location of any point on the Earth can be identified using a geographic coordinate system. This system specifies the latitude and longitude of any location in terms of angles subtended at the center of the Earth, using the equator and (usually) the Greenwich meridian as references. In astronomy, a given point on the celestial sphere (that is, the apparent position of an astronomical object) can be identified using any of several astronomical coordinate systems, where the references vary according to the particular system. Astronomers measure the angular separation of two stars by imagining two lines through the center of the Earth, each intersecting one of the stars. The angle between those lines can be measured and is the angular separation between the two stars. In both geography and astronomy, a sighting direction can be specified in terms of a vertical angle such as altitude /elevation with respect to the horizon as well as the azimuth with respect to north. Astronomers also measure the apparent size of objects as an angular diameter. For example, the full moon has an angular diameter of approximately 0.5°, when viewed from Earth. One could say, "The Moon's diameter subtends an angle of half a degree." The small-angle formula can be used to convert such an angular measurement into a distance/size ratio. See also Angle measuring instrument Angular statistics (mean, standard deviation) Angle

to C, the anticlockwise angle from B to C, the clockwise angle from C to B, or the anticlockwise angle from C to B, where the direction in which the angle is measured determines its sign (see Positive and negative angles). However, in many geometrical situations, it is obvious from context that the positive angle less than or equal to 180 degrees is meant, in which case no ambiguity arises. Otherwise, a convention may be adopted so that ∠BAC always refers to the anticlockwise (positive) angle from B to C, and ∠CAB the anticlockwise (positive) angle from C to B. Types of angles Individual angles There is some common terminology for angles, whose measure is always non-negative (see ): An angle equal to 0° or not turned is called a zero angle. An angle smaller than a right angle (less than 90°) is called an acute angle ("acute" meaning "sharp"). An angle equal to turn (90° or radians) is called a right angle. Two lines that form a right angle are said to be normal, orthogonal, or perpendicular. An angle larger than a right angle and smaller than a straight angle (between 90° and 180°) is called an obtuse angle ("obtuse" meaning "blunt"). An angle equal to turn (180° or radians) is called a straight angle. An angle larger than a straight angle but less than 1 turn (between 180° and 360°) is called a reflex angle. An angle equal to 1 turn (360° or 2 radians) is called a full angle, complete angle, round angle or a perigon. An angle that is not a multiple of a right angle is called an oblique angle. The names, intervals, and measuring units are shown in the table below: Equivalence angle pairs Angles that have the same measure (i.e. the same magnitude) are said to be equal or congruent. An angle is defined by its measure and is not dependent upon the lengths of the sides of the angle (e.g. all right angles are equal in measure). Two angles that share terminal sides, but differ in size by an integer multiple of a turn, are called coterminal angles. A reference angle is the acute version of any angle determined by repeatedly subtracting or adding straight angle ( turn, 180°, or radians), to the results as necessary, until the magnitude of the result is an acute angle, a value between 0 and turn, 90°, or radians. For example, an angle of 30 degrees has a reference angle of 30 degrees, and an angle of 150 degrees also has a reference angle of 30 degrees (180–150). An angle of 750 degrees has a reference angle of 30 degrees (750–720). Vertical and adjacent angle pairs When two straight lines intersect at a point, four angles are formed. Pairwise these angles are named according to their location relative to each other. A pair of angles opposite each other, formed by two intersecting straight lines that form an "X"-like shape, are called vertical angles or opposite angles or vertically opposite angles. They are abbreviated as vert. opp. ∠s. The equality of vertically opposite angles is called the vertical angle theorem. Eudemus of Rhodes attributed the proof to Thales of Miletus. The proposition showed that since both of a pair of vertical angles are supplementary to both of the adjacent angles, the vertical angles are equal in measure. According to a historical note, when Thales visited Egypt, he observed that whenever the Egyptians drew two intersecting lines, they would measure the vertical angles to make sure that they were equal. Thales concluded that one could prove that all vertical angles are equal if one accepted some general notions such as: All straight angles are equal. Equals added to equals are equal. Equals subtracted from equals are equal. When two adjacent angles form a straight line, they are supplementary. Therefore, if we assume that the measure of angle A equals x, then the measure of angle C would be . Similarly, the measure of angle D would be . Both angle C and angle D have measures equal to and are congruent. Since angle B is supplementary to both angles C and D, either of these angle measures may be used to determine the measure of Angle B. Using the measure of either angle C or angle D, we find the measure of angle B to be . Therefore, both angle A and angle B have measures equal to x and are equal in measure. Adjacent angles, often abbreviated as adj. ∠s, are angles that share a common vertex and edge but do not share any interior points. In other words, they are angles that are side by side, or adjacent, sharing an "arm". Adjacent angles which sum to a right angle, straight angle, or full angle are special and are respectively called complementary, supplementary and explementary angles (see below). A transversal is a line that intersects a pair of (often parallel) lines, and is associated with alternate interior angles, corresponding angles, interior angles, and exterior angles. Combining angle pairs Three special angle pairs involve the summation of angles: Complementary angles are angle pairs whose measures sum to one right angle ( turn, 90°, or radians). If the two complementary angles are adjacent, their non-shared sides form a right angle. In Euclidean geometry, the two acute angles in a right triangle are complementary, because the sum of internal angles of a triangle is 180 degrees, and the right angle itself accounts for 90 degrees. The adjective complementary is from Latin complementum, associated with the verb complere, "to fill up". An acute angle is "filled up" by its complement to form a right angle. The difference between an angle and a right angle is termed the complement of the angle. If angles A and B are complementary, the following relationships hold: (The tangent of an angle equals the cotangent of its complement and its secant equals the cosecant of its complement.) The prefix "co-" in the names of some trigonometric ratios refers to the word "complementary". Two angles that sum to a straight angle ( turn, 180°, or radians) are called supplementary angles. If the two supplementary angles are adjacent (i.e. have a common vertex and share just one side), their non-shared sides form a straight line. Such angles are called a linear pair of angles. However, supplementary angles do not have to be on the same line, and can be separated in space. For example, adjacent angles of a parallelogram are supplementary, and opposite angles of a cyclic quadrilateral (one whose vertices all fall on a single circle) are supplementary. If a point P is exterior to a circle with center O, and if the tangent lines from P touch the circle at points T and Q, then ∠TPQ and ∠TOQ are supplementary. The sines of supplementary angles are equal. Their cosines and tangents (unless undefined) are equal in magnitude but have opposite signs. In Euclidean geometry, any sum of two angles in a triangle is supplementary to the third, because the sum of internal angles of a triangle is a straight angle. Two angles that sum to a complete angle (1 turn, 360°, or 2 radians) are called explementary angles or conjugate angles. The difference between an angle and a complete angle is termed the explement of the angle or conjugate of an angle. Polygon-related angles An angle that is part of a simple polygon is called an interior angle if it lies on the inside of that simple polygon. A simple concave polygon has at least one interior angle that is a reflex angle. In Euclidean geometry, the measures of the interior angles of a triangle add up to radians, 180°, or turn; the measures of the interior angles of a simple convex quadrilateral add up to 2 radians, 360°, or 1 turn. In general, the measures of the interior angles of a simple convex polygon with n sides add up to (n − 2) radians, or (n − 2)180 degrees, (n − 2)2 right angles, or (n − 2) turn. The supplement of an interior angle is called an exterior angle, that is, an interior angle and an exterior angle form a linear pair of angles. There are two exterior angles at each vertex of the polygon, each determined by extending one of the two sides of the polygon that meet at the vertex; these two angles are vertical and hence are equal. An exterior angle measures the amount of rotation one has to make at a vertex to trace out the polygon. If the corresponding interior angle is a reflex angle, the exterior angle should be considered negative. Even in a non-simple polygon it may be possible to define the exterior angle, but one will have to pick an orientation of the plane (or surface) to decide the sign of the exterior angle measure. In Euclidean geometry, the sum of the exterior angles of a simple convex polygon, if only one of the two exterior angles is assumed at each vertex, will be one full turn (360°). The exterior angle here could be called a supplementary exterior angle. Exterior angles are commonly used in Logo Turtle programs when drawing regular polygons. In a triangle, the bisectors of two exterior angles and the bisector of the other interior angle are concurrent (meet at a single point). In a triangle, three intersection points, each of an external angle bisector with the opposite extended side, are collinear. In a triangle, three intersection points, two of them between an interior angle bisector and the opposite side, and the third between the other exterior angle bisector and the opposite side extended, are collinear. Some authors use the name exterior angle of a simple polygon to simply mean the explement exterior angle (not supplement!) of the interior angle. This conflicts with the above usage. Plane-related angles The angle between two planes (such as two adjacent faces of a polyhedron) is called a dihedral angle. It may be defined as the acute angle between two lines normal to the planes. The angle between a plane and an intersecting straight line is equal to ninety

Salo (born 1980) Asa of Judah, third king of the Kingdom of Judah Asa people, an ethnic group of Tanzania Places Asa, Iran, in South Khorasan Province Asa, Kwara State, a Local Government Area in Kwara State, Nigeria Asa, Hardoi, a village in Uttar Pradesh, India Asa River (disambiguation), various rivers Other Asa (album), 2013 Falkenbach album Asa (raga), Indian format of musical rules Åsa IF, a Swedish football club located in Åsa Asa language, of the Asa people Asa Station, Japanese railway station in San'yō-Onoda, Yamaguchi Ása, genitive of Æsir, the

Asa, Hardoi, a village in Uttar Pradesh, India Asa River (disambiguation), various rivers Other Asa (album), 2013 Falkenbach album Asa (raga), Indian format of musical rules Åsa IF, a Swedish football club located in Åsa Asa language, of the Asa people Asa Station, Japanese railway station in San'yō-Onoda, Yamaguchi Ása, genitive of Æsir, the predominant group among the Norse gods Asa, or naboot, a staff used in Egyptian stick fencing Aša or Asha, the Avestan language term for

experience as "higher pitched" or "lower pitched" sounds are pressure vibrations having a higher or lower number of cycles per second. In a common technique of acoustic measurement, acoustic signals are sampled in time, and then presented in more meaningful forms such as octave bands or time frequency plots. Both of these popular methods are used to analyze sound and better understand the acoustic phenomenon. The entire spectrum can be divided into three sections: audio, ultrasonic, and infrasonic. The audio range falls between 20 Hz and 20,000 Hz. This range is important because its frequencies can be detected by the human ear. This range has a number of applications, including speech communication and music. The ultrasonic range refers to the very high frequencies: 20,000 Hz and higher. This range has shorter wavelengths which allow better resolution in imaging technologies. Medical applications such as ultrasonography and elastography rely on the ultrasonic frequency range. On the other end of the spectrum, the lowest frequencies are known as the infrasonic range. These frequencies can be used to study geological phenomena such as earthquakes. Analytic instruments such as the spectrum analyzer facilitate visualization and measurement of acoustic signals and their properties. The spectrogram produced by such an instrument is a graphical display of the time varying pressure level and frequency profiles which give a specific acoustic signal its defining character. Transduction in acoustics A transducer is a device for converting one form of energy into another. In an electroacoustic context, this means converting sound energy into electrical energy (or vice versa). Electroacoustic transducers include loudspeakers, microphones, particle velocity sensors, hydrophones and sonar projectors. These devices convert a sound wave to or from an electric signal. The most widely used transduction principles are electromagnetism, electrostatics and piezoelectricity. The transducers in most common loudspeakers (e.g. woofers and tweeters), are electromagnetic devices that generate waves using a suspended diaphragm driven by an electromagnetic voice coil, sending off pressure waves. Electret microphones and condenser microphones employ electrostatics—as the sound wave strikes the microphone's diaphragm, it moves and induces a voltage change. The ultrasonic systems used in medical ultrasonography employ piezoelectric transducers. These are made from special ceramics in which mechanical vibrations and electrical fields are interlinked through a property of the material itself. Acoustician An acoustician is an expert in the science of sound. Education There are many types of acoustician, but they usually have a Bachelor's degree or higher qualification. Some possess a degree in acoustics, while others enter the discipline via studies in fields such as physics or engineering. Much work in acoustics requires a good grounding in Mathematics and science. Many acoustic scientists work in research and development. Some conduct basic research to advance our knowledge of the perception (e.g. hearing, psychoacoustics or neurophysiology) of speech, music and noise. Other acoustic scientists advance understanding of how sound is affected as it moves through environments, e.g. underwater acoustics, architectural acoustics or structural acoustics. Other areas of work are listed under subdisciplines below. Acoustic scientists work in government, university and private industry laboratories. Many go on to work in Acoustical Engineering. Some positions, such as Faculty (academic staff) require a Doctor of Philosophy. Subdisciplines Archaeoacoustics Archaeoacoustics, also known as the archaeology of sound, is one of the only ways to experience the past with senses other than our eyes. Archaeoacoustics is studied by testing the acoustic properties of prehistoric sites, including caves. Iegor Rezkinoff, a sound archaeologist, studies the acoustic properties of caves through natural sounds like humming and whistling. Archaeological theories of acoustics are focused around ritualistic purposes as well as a way of echolocation in the caves. In archaeology, acoustic sounds and rituals directly correlate as specific sounds were meant to bring ritual participants closer to a spiritual awakening. Parallels can also be drawn between cave wall paintings and the acoustic properties of the cave; they are both dynamic. Because archaeoacoustics is a fairly new archaeological subject, acoustic sound is still being tested in these prehistoric sites today. Aeroacoustics Aeroacoustics is the study of noise generated by air movement, for instance via turbulence, and the movement of sound through the fluid air. This knowledge is applied in acoustical engineering to study how to quieten aircraft. Aeroacoustics is important for understanding how wind musical instruments work. Acoustic signal processing Acoustic signal processing is the electronic manipulation of acoustic signals. Applications include: active noise control; design for hearing aids or cochlear implants; echo cancellation; music information retrieval, and perceptual coding (e.g. MP3 or Opus). Architectural acoustics Architectural acoustics (also known as building acoustics) involves the scientific understanding of how to achieve good sound within a building. It typically involves the study of speech intelligibility, speech privacy, music quality, and vibration reduction in the built environment. Commonly studied environments are hospitals, classrooms, dwellings, performance venues, recording and broadcasting studios. Focus considerations include room acoustics, airborne and impact transmission in building structures, airborne and structure-borne noise control, noise control of building systems and electroacoustic systems . Bioacoustics Bioacoustics is the scientific study of the hearing and calls of animal calls, as well as how animals are affected by the acoustic and sounds of their habitat. Electroacoustics This subdiscipline is concerned with the recording, manipulation and reproduction of audio using electronics. This might include products such as mobile phones, large scale public address systems or virtual reality systems in research laboratories. Environmental noise and soundscapes Environmental acoustics is concerned with noise and vibration caused by railways, road traffic, aircraft, industrial equipment and recreational activities. The main aim of these studies is to reduce levels of environmental noise and vibration. Research work now also has a focus on the positive use of sound in urban environments: soundscapes and tranquility. Musical acoustics Musical acoustics is the study of the physics of acoustic instruments; the audio signal processing used in electronic music; the computer analysis of music and composition, and the perception and cognitive neuroscience of music. Noise The goal this acoustics sub-discipline is to reduce the impact of unwanted sound. Scope of noise studies includes the generation, propagation, and impact on structures, objects, and people. Innovative model development Measurement techniques Mitigation strategies Inupt to the establishment of standards and regulations Noise research investigates the impact of noise on humans and animals to include work in definitions, abatement, transportation noise, hearing protection, Jet and rocket noise, building system noise and vibration, atmospheric sound propagation, soundscapes, and low-frequency sound. Psychoacoustics Many studies have been conducted to identify the relationship between acoustics and cognition, or more commonly known as psychoacoustics, in which what one hears is a combination of perception and biological aspects. The information intercepted by the passage of sound waves through the ear is understood and interpreted through the brain, emphasizing the connection between the mind and acoustics. Psychological changes have been seen as brain waves slow down or speed up as a result of varying auditory stimulus which can in turn affect the way one thinks, feels, or even behaves. This correlation can be viewed in normal, everyday situations in which listening to an upbeat or

the archaeology of sound, is one of the only ways to experience the past with senses other than our eyes. Archaeoacoustics is studied by testing the acoustic properties of prehistoric sites, including caves. Iegor Rezkinoff, a sound archaeologist, studies the acoustic properties of caves through natural sounds like humming and whistling. Archaeological theories of acoustics are focused around ritualistic purposes as well as a way of echolocation in the caves. In archaeology, acoustic sounds and rituals directly correlate as specific sounds were meant to bring ritual participants closer to a spiritual awakening. Parallels can also be drawn between cave wall paintings and the acoustic properties of the cave; they are both dynamic. Because archaeoacoustics is a fairly new archaeological subject, acoustic sound is still being tested in these prehistoric sites today. Aeroacoustics Aeroacoustics is the study of noise generated by air movement, for instance via turbulence, and the movement of sound through the fluid air. This knowledge is applied in acoustical engineering to study how to quieten aircraft. Aeroacoustics is important for understanding how wind musical instruments work. Acoustic signal processing Acoustic signal processing is the electronic manipulation of acoustic signals. Applications include: active noise control; design for hearing aids or cochlear implants; echo cancellation; music information retrieval, and perceptual coding (e.g. MP3 or Opus). Architectural acoustics Architectural acoustics (also known as building acoustics) involves the scientific understanding of how to achieve good sound within a building. It typically involves the study of speech intelligibility, speech privacy, music quality, and vibration reduction in the built environment. Commonly studied environments are hospitals, classrooms, dwellings, performance venues, recording and broadcasting studios. Focus considerations include room acoustics, airborne and impact transmission in building structures, airborne and structure-borne noise control, noise control of building systems and electroacoustic systems . Bioacoustics Bioacoustics is the scientific study of the hearing and calls of animal calls, as well as how animals are affected by the acoustic and sounds of their habitat. Electroacoustics This subdiscipline is concerned with the recording, manipulation and reproduction of audio using electronics. This might include products such as mobile phones, large scale public address systems or virtual reality systems in research laboratories. Environmental noise and soundscapes Environmental acoustics is concerned with noise and vibration caused by railways, road traffic, aircraft, industrial equipment and recreational activities. The main aim of these studies is to reduce levels of environmental noise and vibration. Research work now also has a focus on the positive use of sound in urban environments: soundscapes and tranquility. Musical acoustics Musical acoustics is the study of the physics of acoustic instruments; the audio signal processing used in electronic music; the computer analysis of music and composition, and the perception and cognitive neuroscience of music. Noise The goal this acoustics sub-discipline is to reduce the impact of unwanted sound. Scope of noise studies includes the generation, propagation, and impact on structures, objects, and people. Innovative model development Measurement techniques Mitigation strategies Inupt to the establishment of standards and regulations Noise research investigates the impact of noise on humans and animals to include work in definitions, abatement, transportation noise, hearing protection, Jet and rocket noise, building system noise and vibration, atmospheric sound propagation, soundscapes, and low-frequency sound. Psychoacoustics Many studies have been conducted to identify the relationship between acoustics and cognition, or more commonly known as psychoacoustics, in which what one hears is a combination of perception and biological aspects. The information intercepted by the passage of sound waves through the ear is understood and interpreted through the brain, emphasizing the connection between the mind and acoustics. Psychological changes have been seen as brain waves slow down or speed up as a result of varying auditory stimulus which can in turn affect the way one thinks, feels, or even behaves. This correlation can be viewed in normal, everyday situations in which listening to an upbeat or uptempo song can cause one's foot to start tapping or a slower song can leave one feeling calm and serene. In a deeper biological look at the phenomenon of psychoacoustics, it was discovered that the central nervous system is activated by basic acoustical characteristics of music. By observing how the central nervous system, which includes the brain and spine, is influenced by acoustics, the pathway in which acoustic affects the mind, and essentially the body, is evident. Speech Acousticians study the production, processing and perception of speech. Speech recognition and Speech synthesis are two important areas of speech processing using computers. The subject also overlaps with the disciplines of physics, physiology, psychology, and linguistics. Structural Vibration and Dynamics Structural acoustics is the study of motions and interactions of mechanical systems with their environments and the methods of their measurement, analysis, and control . There are several sub-disciplines found within this regime: Modal Analysis Material characterization Structural health monitoring Acoustic Metamaterials Friction Acoustics Applications might include: ground vibrations from railways; vibration isolation to reduce vibration in operating theatres; studying how vibration can damage health (vibration white finger); vibration control to protect a building from earthquakes, or measuring how structure-borne sound moves through buildings. Ultrasonics Ultrasonics deals with sounds at frequencies too high to be heard by humans. Specialisms include medical ultrasonics (including medical ultrasonography), sonochemistry, ultrasonic testing, material characterisation and underwater acoustics (sonar). Underwater acoustics Underwater acoustics is the scientific study of natural and man-made sounds underwater. Applications include sonar to locate submarines, underwater communication by whales, climate change monitoring by measuring sea temperatures acoustically, sonic weapons, and marine bioacoustics. Professional societies The Acoustical Society of America (ASA) Australian Acoustical Society (AAS) The European Acoustics Association (EAA) Institute of Electrical and Electronics Engineers (IEEE) Institute of Acoustics (IoA UK) The Audio Engineering Society (AES) American Society of Mechanical Engineers, Noise Control and Acoustics Division (ASME-NCAD) International Commission for Acoustics (ICA) American Institute of Aeronautics and Astronautics, Aeroacoustics (AIAA) International Computer Music Association (ICMA) Academic journals Acta Acustica united with Acustica Applied Acoustics Journal of the Acoustical Society of America (JASA) Journal of the Acoustical Society of America, Express Letters (JASA-EL) Journal of the Audio Engineering Society Journal of Sound and Vibration (JSV) Journal of Vibration and Acoustics American Society of Mechanical Engineers Ultrasonics (journal) See also Outline of acoustics Acoustic attenuation Acoustic emission Acoustic engineering Acoustic impedance Acoustic levitation Acoustic location Acoustic phonetics Acoustic streaming Acoustic tags Acoustic thermometry Acoustic wave Audiology Auditory illusion Diffraction Doppler effect Fisheries acoustics Friction acoustics Helioseismology Lamb wave Linear elasticity The Little Red Book of Acoustics (in the UK) Longitudinal wave Musicology Music therapy Noise pollution One-Way Wave Equation Phonon Picosecond ultrasonics Rayleigh wave Shock wave Seismology Sonification Sonochemistry Soundproofing Soundscape Sonic boom Sonoluminescence Surface acoustic wave Thermoacoustics Transverse wave Wave equation References

majority of the time they are. By this consideration atomic physics provides the underlying theory in plasma physics and atmospheric physics, even though both deal with very large numbers of atoms. Electronic configuration Electrons form notional shells around the nucleus. These are normally in a ground state but can be excited by the absorption of energy from light (photons), magnetic fields, or interaction with a colliding particle (typically ions or other electrons). Electrons that populate a shell are said to be in a bound state. The energy necessary to remove an electron from its shell (taking it to infinity) is called the binding energy. Any quantity of energy absorbed by the electron in excess of this amount is converted to kinetic energy according to the conservation of energy. The atom is said to have undergone the process of ionization. If the electron absorbs a quantity of energy less than the binding energy, it will be transferred to an excited state. After a certain time, the electron in an excited state will "jump" (undergo a transition) to a lower state. In a neutral atom, the system will emit a photon of the difference in energy, since energy is conserved. If an inner electron has absorbed more than the binding energy (so that the atom ionizes), then a more outer electron may undergo a transition to fill the inner orbital. In this case, a visible photon or a characteristic x-ray is emitted, or a phenomenon known as the Auger effect may take place, where the released energy is transferred to another bound electron, causing it to go into the continuum. The Auger effect allows one to multiply ionize an atom with a single photon. There are rather strict selection rules as to the electronic configurations that can be reached by excitation by light — however there are no such rules for excitation by collision processes. History and developments One of the earliest steps towards atomic physics was the recognition that matter was composed of atoms. It forms a part of the texts written in 6th century BC to 2nd

atomic processes that are generally considered. This means that the individual atoms can be treated as if each were in isolation, as the vast majority of the time they are. By this consideration atomic physics provides the underlying theory in plasma physics and atmospheric physics, even though both deal with very large numbers of atoms. Electronic configuration Electrons form notional shells around the nucleus. These are normally in a ground state but can be excited by the absorption of energy from light (photons), magnetic fields, or interaction with a colliding particle (typically ions or other electrons). Electrons that populate a shell are said to be in a bound state. The energy necessary to remove an electron from its shell (taking it to infinity) is called the binding energy. Any quantity of energy absorbed by the electron in excess of this amount is converted to kinetic energy according to the conservation of energy. The atom is said to have undergone the process of ionization. If the electron absorbs a quantity of energy less than the binding energy, it will be transferred to an excited state. After a certain time, the electron in an excited state will "jump" (undergo a transition) to a lower state. In a neutral atom, the system will emit a photon of the difference in energy, since energy is conserved. If an inner electron has absorbed more than the binding energy (so that the atom ionizes), then a more outer electron may undergo a transition to fill the inner orbital. In this case, a visible photon or a characteristic x-ray is emitted, or a phenomenon known as the Auger effect may take place, where the released energy is transferred to another bound electron, causing it to go into the continuum. The Auger effect allows one to multiply ionize an atom with a single photon. There are rather strict selection rules as to the electronic configurations that can be reached by excitation by light — however there are no such rules for excitation by collision processes. History and developments One of the earliest steps towards atomic physics was the recognition that matter was composed of atoms. It forms a part of the texts written in 6th century BC to 2nd century BC such as those of Democritus or Vaisheshika Sutra written by Kanad. This theory was later developed in the modern sense

after ASD, and knowledge of ASL spread to those schools. In addition, the rise of Deaf community organizations bolstered the continued use of ASL. Societies such as the National Association of the Deaf and the National Fraternal Society of the Deaf held national conventions that attracted signers from across the country. All of that contributed to ASL's wide use over a large geographical area, atypical of a sign language. Up to the 1950s, the predominant method in deaf education was oralism, acquiring oral language comprehension and production. Linguists did not consider sign language to be true "language" but as something inferior. Recognition of the legitimacy of ASL was achieved by William Stokoe, a linguist who arrived at Gallaudet University in 1955 when that was still the dominant assumption. Aided by the Civil Rights Movement of the 1960s, Stokoe argued for manualism, the use of sign language in deaf education. Stokoe noted that sign language shares the important features that oral languages have as a means of communication, and even devised a transcription system for ASL. In doing so, Stokoe revolutionized both deaf education and linguistics. In the 1960s, ASL was sometimes referred to as "Ameslan", but that term is now considered obsolete. Population Counting the number of ASL signers is difficult because ASL users have never been counted by the American census. The ultimate source for current estimates of the number of ASL users in the United States is a report for the National Census of the Deaf Population (NCDP) by Schein and Delk (1974). Based on a 1972 survey of the NCDP, Schein and Delk provided estimates consistent with a signing population between 250,000 and 500,000. The survey did not distinguish between ASL and other forms of signing; in fact, the name "ASL" was not yet in widespread use. Incorrect figures are sometimes cited for the population of ASL users in the United States based on misunderstandings of known statistics. Demographics of the deaf population have been confused with those of ASL use since adults who become deaf late in life rarely use ASL in the home. That accounts for currently-cited estimations that are greater than 500,000; such mistaken estimations can reach as high as 15,000,000. A 100,000-person lower bound has been cited for ASL users; the source of that figure is unclear, but it may be an estimate of prelingual deafness, which is correlated with but not equivalent to signing. ASL is sometimes incorrectly cited as the third- or fourth-most-spoken language in the United States. Those figures misquote Schein and Delk (1974), who actually concluded that ASL speakers constituted the third-largest population "requiring an interpreter in court". Although that would make ASL the third-most used language among monolinguals other than English, it does not imply that it is the fourth-most-spoken language in the United States since speakers of other languages may also speak English. Geographic distribution ASL is used throughout Anglo-America. That contrasts with Europe, where a variety of sign languages are used within the same continent. The unique situation of ASL seems to have been caused by the proliferation of ASL through schools influenced by the American School for the Deaf, wherein ASL originated, and the rise of community organizations for the Deaf. Throughout West Africa, ASL-based sign languages are signed by educated Deaf adults. Such languages, imported by boarding schools, are often considered by associations to be the official sign languages of their countries and are named accordingly, such as Nigerian Sign Language, Ghanaian Sign Language. Such signing systems are found in Benin, Burkina Faso, Ivory Coast, Ghana, Liberia, Mauritania, Mali, Nigeria, and Togo. Due to lack of data, it is still an open question how similar those sign languages are to the variety of ASL used in America. In addition to the aforementioned West African countries, ASL is reported to be used as a first language in Barbados, Bolivia, Cambodia (alongside Cambodian Sign Language), the Central African Republic, Chad, China (Hong Kong), the Democratic Republic of the Congo, Gabon, Jamaica, Kenya, Madagascar, the Philippines, Singapore, and Zimbabwe. ASL is also used as a lingua franca throughout the deaf world, widely learned as a second language. Regional variation Sign production Sign production can often vary according to location. Signers from the South tend to sign with more flow and ease. Native signers from New York have been reported as signing comparatively more quickly and sharply. Sign production of native Californian signers has also been reported as being fast as well. Research on that phenomenon often concludes that the fast-paced production for signers from the coasts could be due to the fast-paced nature of living in large metropolitan areas. That conclusion also supports how the ease with which Southern sign could be caused by the easygoing environment of the South in comparison to that of the coasts. Sign production can also vary depending on age and native language. For example, sign production of letters may vary in older signers. Slight differences in finger spelling production can be a signal of age. Additionally, signers who learned American Sign Language as a second language vary in production. For Deaf signers who learned a different sign language before learning American Sign Language, qualities of their native language may show in their ASL production. Some examples of that varied production include finger spelling towards the body, instead of away from it, and signing certain movement from bottom to top, instead of top to bottom. Hearing people who learn American Sign Language also have noticeable differences in signing production. The most notable production difference of hearing people learning American Sign Language is their rhythm and arm posture. Sign variants Most popularly, there are variants of the signs for English words such as "birthday", "pizza", "Halloween", "early", and "soon", just a sample of the most commonly recognized signs with variant based on regional change. The sign for "school" is commonly varied between black and white signers. The variation between sign produced by black and white signers is sometimes referred to as Black American Sign Language. History and implications The prevalence of residential Deaf schools can account for much of the regional variance of signs and sign productions across the United States. Deaf schools often serve students of the state in which the school resides. That limited access to signers from other regions, combined with the residential quality of Deaf Schools promoted specific use of certain sign variants. Native signers did not have much access to signers from other regions during the beginning years of their education. It is hypothesized that because of that seclusion, certain variants of a sign prevailed over others due to the choice of variant used by the student of the school/signers in the community. However, American Sign Language does not appear to be vastly varied in comparison to other signed languages. That is because when Deaf education was beginning in the United States, many educators flocked to the American School for the Deaf in Hartford, Connecticut, whose central location for the first generation of educators in Deaf education to learn American Sign Language allows ASL to be more standardized than its variant. Varieties Varieties of ASL are found throughout the world. There is little difficulty in comprehension among the varieties of the United States and Canada. Mutual intelligibility among those ASL varieties is high, and the variation is primarily lexical. For example, there are three different words for English about in Canadian ASL; the standard way, and two regional variations (Atlantic and Ontario). Variation may also be phonological, meaning that the same sign may be signed in a different way depending on the region. For example, an extremely common type of variation is between the handshapes /1/, /L/, and /5/ in signs with one handshape. There is also a distinct variety of ASL used by the Black Deaf community. Black ASL evolved as a result of racially segregated schools in some states, which included the residential schools for the deaf. Black ASL differs from standard ASL in vocabulary, phonology, and some grammatical structure. While African American English (AAE) is generally viewed as more innovating than standard English, Black ASL is more conservative than standard ASL, preserving older forms of many signs. Black sign language speakers use more two-handed signs than in mainstream ASL, are less likely to show assimilatory lowering of signs produced on the forehead (e.g. KNOW) and use a wider signing space. Modern Black ASL borrows a number of idioms from AAE; for instance, the AAE idiom "I feel you" is calqued into Black ASL. ASL is used internationally as a lingua franca, and a number of closely related sign languages derived from ASL are used in many different countries. Even so, there have been varying degrees of divergence from standard ASL in those imported ASL varieties. Bolivian Sign Language is reported to be a dialect of ASL, no more divergent than other acknowledged dialects. On the other hand, it is also known that some imported ASL varieties have diverged to the extent of being separate languages. For example, Malaysian Sign Language, which has ASL origins, is no longer mutually comprehensible with ASL and must be considered its own language. For some imported ASL varieties, such as those used in West Africa, it is still an open question how similar they are to American ASL. When communicating with hearing English speakers, ASL-speakers often use what is commonly called Pidgin Signed English (PSE) or 'contact signing', a blend of English structure with ASL vocabulary. Various types of PSE exist, ranging from highly English-influenced PSE (practically relexified English) to PSE which is quite close to ASL lexically and grammatically, but may alter some subtle features of ASL grammar. Fingerspelling may be used more often in PSE than it is normally used in ASL. There have been some constructed sign languages, known as Manually Coded English (MCE), which match English grammar exactly and simply replace spoken words with signs; those systems are not considered to be varieties of ASL. Tactile ASL (TASL) is a variety of ASL used throughout the United States by and with the deaf-blind. It is particularly common among those with Usher's syndrome. It results in deafness from birth followed by loss of vision later in life; consequently, those with Usher's syndrome often grow up in the Deaf community using ASL, and later transition to TASL. TASL differs from ASL in that signs are produced by touching the palms, and there are some grammatical differences from standard ASL in order to compensate for the lack of non-manual signing. Stigma In 2013, the White House published a response to a petition that gained over 37,000 signatures to officially recognize American Sign Language as a community language and a language of instruction in schools. The response is titled "there shouldn't be any stigma about American Sign Language" and addressed that ASL is a vital language for the Deaf and hard of hearing. Stigmas associated with sign languages and the use of sign for educating children often lead to the absence of sign during periods in children's lives when they can access languages most effectively. Scholars such as Beth S. Benedict advocate not only for bilingualism (using ASL and English training) but also for early childhood intervention for children who are deaf. York University psychologist Ellen Bialystok has also campaigned for bilingualism, arguing that those who are bilingual acquire cognitive skills that may help to prevent dementia later in life. Most children born to deaf parents are hearing. Known as CODAs ("Children Of Deaf Adults"), they are often more culturally Deaf than deaf children, most of whom are born to hearing parents. Unlike many deaf children, CODAs acquire ASL as well as Deaf cultural values and behaviors from birth. Such bilingual hearing children may be mistakenly labeled as being "slow learners" or as having "language difficulties" because of preferential attitudes towards spoken language. Writing systems Although there is no well-established writing system for ASL, written sign language dates back almost two centuries. The first systematic writing system for a sign language seems to be that of Roch-Ambroise Auguste Bébian, developed in 1825. However, written sign language remained marginal among the public. In the 1960s, linguist William Stokoe created Stokoe notation specifically for ASL. It is alphabetic, with a letter or diacritic for every phonemic (distinctive) hand shape, orientation, motion, and position, though it lacks any representation of facial expression, and is better suited for individual words than for extended passages of text. Stokoe used that system for his 1965 A Dictionary of American Sign Language on Linguistic Principles. SignWriting, proposed in 1974 by Valerie Sutton, is the first writing system to gain use among the public and the first writing

also vary depending on age and native language. For example, sign production of letters may vary in older signers. Slight differences in finger spelling production can be a signal of age. Additionally, signers who learned American Sign Language as a second language vary in production. For Deaf signers who learned a different sign language before learning American Sign Language, qualities of their native language may show in their ASL production. Some examples of that varied production include finger spelling towards the body, instead of away from it, and signing certain movement from bottom to top, instead of top to bottom. Hearing people who learn American Sign Language also have noticeable differences in signing production. The most notable production difference of hearing people learning American Sign Language is their rhythm and arm posture. Sign variants Most popularly, there are variants of the signs for English words such as "birthday", "pizza", "Halloween", "early", and "soon", just a sample of the most commonly recognized signs with variant based on regional change. The sign for "school" is commonly varied between black and white signers. The variation between sign produced by black and white signers is sometimes referred to as Black American Sign Language. History and implications The prevalence of residential Deaf schools can account for much of the regional variance of signs and sign productions across the United States. Deaf schools often serve students of the state in which the school resides. That limited access to signers from other regions, combined with the residential quality of Deaf Schools promoted specific use of certain sign variants. Native signers did not have much access to signers from other regions during the beginning years of their education. It is hypothesized that because of that seclusion, certain variants of a sign prevailed over others due to the choice of variant used by the student of the school/signers in the community. However, American Sign Language does not appear to be vastly varied in comparison to other signed languages. That is because when Deaf education was beginning in the United States, many educators flocked to the American School for the Deaf in Hartford, Connecticut, whose central location for the first generation of educators in Deaf education to learn American Sign Language allows ASL to be more standardized than its variant. Varieties Varieties of ASL are found throughout the world. There is little difficulty in comprehension among the varieties of the United States and Canada. Mutual intelligibility among those ASL varieties is high, and the variation is primarily lexical. For example, there are three different words for English about in Canadian ASL; the standard way, and two regional variations (Atlantic and Ontario). Variation may also be phonological, meaning that the same sign may be signed in a different way depending on the region. For example, an extremely common type of variation is between the handshapes /1/, /L/, and /5/ in signs with one handshape. There is also a distinct variety of ASL used by the Black Deaf community. Black ASL evolved as a result of racially segregated schools in some states, which included the residential schools for the deaf. Black ASL differs from standard ASL in vocabulary, phonology, and some grammatical structure. While African American English (AAE) is generally viewed as more innovating than standard English, Black ASL is more conservative than standard ASL, preserving older forms of many signs. Black sign language speakers use more two-handed signs than in mainstream ASL, are less likely to show assimilatory lowering of signs produced on the forehead (e.g. KNOW) and use a wider signing space. Modern Black ASL borrows a number of idioms from AAE; for instance, the AAE idiom "I feel you" is calqued into Black ASL. ASL is used internationally as a lingua franca, and a number of closely related sign languages derived from ASL are used in many different countries. Even so, there have been varying degrees of divergence from standard ASL in those imported ASL varieties. Bolivian Sign Language is reported to be a dialect of ASL, no more divergent than other acknowledged dialects. On the other hand, it is also known that some imported ASL varieties have diverged to the extent of being separate languages. For example, Malaysian Sign Language, which has ASL origins, is no longer mutually comprehensible with ASL and must be considered its own language. For some imported ASL varieties, such as those used in West Africa, it is still an open question how similar they are to American ASL. When communicating with hearing English speakers, ASL-speakers often use what is commonly called Pidgin Signed English (PSE) or 'contact signing', a blend of English structure with ASL vocabulary. Various types of PSE exist, ranging from highly English-influenced PSE (practically relexified English) to PSE which is quite close to ASL lexically and grammatically, but may alter some subtle features of ASL grammar. Fingerspelling may be used more often in PSE than it is normally used in ASL. There have been some constructed sign languages, known as Manually Coded English (MCE), which match English grammar exactly and simply replace spoken words with signs; those systems are not considered to be varieties of ASL. Tactile ASL (TASL) is a variety of ASL used throughout the United States by and with the deaf-blind. It is particularly common among those with Usher's syndrome. It results in deafness from birth followed by loss of vision later in life; consequently, those with Usher's syndrome often grow up in the Deaf community using ASL, and later transition to TASL. TASL differs from ASL in that signs are produced by touching the palms, and there are some grammatical differences from standard ASL in order to compensate for the lack of non-manual signing. Stigma In 2013, the White House published a response to a petition that gained over 37,000 signatures to officially recognize American Sign Language as a community language and a language of instruction in schools. The response is titled "there shouldn't be any stigma about American Sign Language" and addressed that ASL is a vital language for the Deaf and hard of hearing. Stigmas associated with sign languages and the use of sign for educating children often lead to the absence of sign during periods in children's lives when they can access languages most effectively. Scholars such as Beth S. Benedict advocate not only for bilingualism (using ASL and English training) but also for early childhood intervention for children who are deaf. York University psychologist Ellen Bialystok has also campaigned for bilingualism, arguing that those who are bilingual acquire cognitive skills that may help to prevent dementia later in life. Most children born to deaf parents are hearing. Known as CODAs ("Children Of Deaf Adults"), they are often more culturally Deaf than deaf children, most of whom are born to hearing parents. Unlike many deaf children, CODAs acquire ASL as well as Deaf cultural values and behaviors from birth. Such bilingual hearing children may be mistakenly labeled as being "slow learners" or as having "language difficulties" because of preferential attitudes towards spoken language. Writing systems Although there is no well-established writing system for ASL, written sign language dates back almost two centuries. The first systematic writing system for a sign language seems to be that of Roch-Ambroise Auguste Bébian, developed in 1825. However, written sign language remained marginal among the public. In the 1960s, linguist William Stokoe created Stokoe notation specifically for ASL. It is alphabetic, with a letter or diacritic for every phonemic (distinctive) hand shape, orientation, motion, and position, though it lacks any representation of facial expression, and is better suited for individual words than for extended passages of text. Stokoe used that system for his 1965 A Dictionary of American Sign Language on Linguistic Principles. SignWriting, proposed in 1974 by Valerie Sutton, is the first writing system to gain use among the public and the first writing system for sign languages to be included in the Unicode Standard. SignWriting consists of more than 5000 distinct iconic graphs/glyphs. Currently, it is in use in many schools for the Deaf, particularly in Brazil, and has been used in International Sign forums with speakers and researchers in more than 40 countries, including Brazil, Ethiopia, France, Germany, Italy, Portugal, Saudi Arabia, Slovenia, Tunisia, and the United States. Sutton SignWriting has both a printed and an electronically produced form so that persons can use the system anywhere that oral languages are written (personal letters, newspapers, and media, academic research). The systematic

game collections that allowed players to compete against live opponents in real-time. An applet could also be a text area only, providing, for instance, a cross platform command-line interface to some remote system. If needed, an applet could leave the dedicated area and run as a separate window. However, applets had very little control over web page content outside the applet dedicated area, so they were less useful for improving the site appearance in general (while applets like news tickers or WYSIWYG editors are also known). Applets could also play media in formats that are not natively supported by the browser. HTML pages could embed parameters that were passed to the applet. Hence the same applet could appear differently depending on the parameters that were passed. Examples of Web-based Applets include: QuickTime movies Flash movies Windows Media Player applets, used to display embedded video files in Internet Explorer (and other browsers that supported the plugin) 3D modeling display applets, used to rotate and zoom a model Browser games that were applet-based, though some developed into fully functional applications that required installation. Applet Vs. Subroutine A larger application distinguishes its applets through several features: Applets execute only on the "client" platform environment of a system, as contrasted from "servlet". As such, an applet provides functionality or performance beyond the default capabilities of its container (the browser). The container restricts applets' capabilities. Applets are written in a language different from the scripting or HTML language that invokes it. The applet is written in a compiled language, whereas the scripting language of the container is an interpreted language, hence the greater performance or functionality of the applet. Unlike a subroutine, a complete web component can be implemented as an applet. Java applets A Java applet is a Java program that is launched from HTML and run in a web browser.It takes code from server and run in a web browser.It can provide web applications with interactive features that cannot be provided by HTML. Since Java's bytecode is platform-independent, Java applets can be executed by browsers running under many platforms, including Windows, Unix, macOS, and Linux. When a Java technology-enabled web browser processes a page that contains an applet, the applet's code is transferred to the client's system and executed by the browser's Java Virtual Machine (JVM). An HTML page references an applet either via the deprecated tag or via its replacement, the tag. Security Recent developments in the coding of applications including mobile and embedded systems have led to the awareness of the security of applets.

as an extension of other software In some cases, an applet does not run independently. These applets must run either in a container provided by a host program, through a plugin, or a variety of other applications including mobile devices that support the applet programming model. Web-based Applets Applets were used to provide interactive features to web applications that historically could not be provided by HTML alone. They could capture mouse input and also had controls like buttons or check boxes. In response to the user action an applet could change the provided graphic content. This made applets well suitable for demonstration, visualization, and teaching. There were online applet collections for studying various subjects, from physics to heart physiology. Applets were also used to create online game collections that allowed players to compete against live opponents in real-time. An applet could also be a text area only, providing, for instance, a cross platform command-line interface to some remote system. If needed, an applet could leave the dedicated area and run as a separate window. However, applets had very little control over web page content outside the applet dedicated area, so they were less useful for improving the site appearance in general (while applets like news tickers or WYSIWYG editors are also known). Applets could also play media in formats that are not natively supported by the browser. HTML pages could embed parameters that were passed to the applet. Hence the same applet could appear differently depending on the parameters that were passed. Examples of Web-based Applets include: QuickTime movies Flash movies Windows Media Player applets, used to display embedded video files in Internet Explorer (and other browsers that supported the plugin) 3D modeling display applets, used to rotate and zoom a model Browser games that were applet-based, though some developed into fully functional applications that required installation. Applet Vs. Subroutine A larger application distinguishes its applets through several features: Applets execute only on the "client" platform environment of a system, as contrasted from "servlet". As such, an applet provides functionality or performance beyond the default capabilities of its container (the browser). The container restricts applets' capabilities. Applets are written in a language different from the scripting or HTML language that invokes it. The applet is written in a compiled language, whereas the scripting language of the container is an interpreted language, hence the greater performance or functionality of the applet. Unlike a subroutine, a complete web component can be implemented as an applet. Java

a small American town into an alternative version of the US run by believers in a form of Christianity known as Gnosticism, who are engaged in a bitter war with the "Spanish" in Mexico (the chief scientist at the laboratory where the experiment occurred is described as a Gnostic, and references to Christian Gnosticism appear repeatedly in the book). In Time for Patriots by retired astronomer Thomas Wm. Hamilton (4897 Tomhamilton) a town and military academy on Long Island are transported back to 1770, where they shorten the American Revolution, rewrite the Constitution, prolong Mozart's life, battle Barbary pirates, and have other adventures. Although not dealing in physical time travel, in his alt-history novel Marx Returns, Jason Barker introduces anachronisms into the life and times of Karl Marx, such as when his wife Jenny sings a verse from the Sex Pistols's song "Anarchy in the U.K.", or in the games of chess she plays with the Marxes' housekeeper Helene Demuth, which on one occasion involves a Caro–Kann Defence. In her review of the novel, Nina Power writes of "Jenny’s 'utopian' desire for an end to time", an attitude which, according to Power, is inspired by her husband's co-authored book The German Ideology. However, in keeping with the novel's anachronisms, the latter was not published until 1932. By contrast, the novel's timeline ends in 1871. In fantasy genre Many works of straight fantasy and science fantasy take place in historical settings, though with the addition of, for example, magic or mythological beasts. Some present a secret history in which the modern day world no longer believes that these elements ever existed. Many ambiguous alternate/secret histories are set in Renaissance or pre-Renaissance times, and may explicitly include a "retreat" from the world, which would explain the current absence of such phenomena. Other stories make plan a divergence of some kind. In Poul Anderson's Three Hearts and Three Lions in which the Matter of France is history and the fairy folk are real and powerful. The same author's A Midsummer Tempest, occurs in a world in which the plays of William Shakespeare (called here "the Great Historian"), presented the literal truth in every instance. The novel itself takes place in the era of Oliver Cromwell and Charles I. Here, the English Civil War had a different outcome, and the Industrial Revolution has occurred early. Randall Garrett's "Lord Darcy" series presents a point of divergence: a monk systemizes magic rather than science, so the use of foxglove to treat heart disease is regarded as superstition. Another point of divergence occurs in 1199, when Richard the Lionheart survives the Siege of Chaluz and returns to England and makes the Angevin Empire so strong that it survives into the 20th century. Jonathan Strange & Mr Norrell by Susanna Clarke takes place in an England where a separate Kingdom ruled by the Raven King and founded on magic existed in Northumbria for over 300 years. In Patricia Wrede's Regency fantasies, Great Britain has a Royal Society of Wizards. The Tales of Alvin Maker series by Orson Scott Card (a parallel to the life of Joseph Smith, founder of the Latter Day Saint movement) takes place in an alternate America, beginning in the early 19th century. Prior to that time, a POD occurred: England, under the rule of Oliver Cromwell, had banished "makers", or anyone else demonstrating "knacks" (an ability to perform seemingly supernatural feats) to the North American continent. Thus the early American colonists embraced as perfectly ordinary these gifts, and counted on them as a part of their daily lives. The political division of the continent is considerably altered, with two large English colonies bookending a smaller "American" nation, one aligned with England, and the other governed by exiled Cavaliers. Actual historical figures are seen in a much different light: Ben Franklin is revered as the continent's finest "maker", George Washington was executed after being captured, and "Tom" Jefferson is the first president of "Appalachia", the result of a compromise between the Continentals and the British Crown. On the other hand, when the "Old Ones" (fairies) still manifest themselves in England in Keith Roberts's Pavane, which takes place in a technologically backward world after a Spanish assassination of Elizabeth I allowed the Spanish Armada to conquer England, the possibility that the fairies were real but retreated from modern advances makes the POD possible: the fairies really were present all along, in a secret history. Again, in the English Renaissance fantasy Armor of Light by Melissa Scott and Lisa A. Barnett, the magic used in the book, by Dr. John Dee and others, actually was practiced in the Renaissance; positing a secret history of effective magic makes this an alternate history with a point of departure. Sir Philip Sidney survives the Battle of Zutphen in 1586, and shortly thereafter saving the life of Christopher Marlowe. When the magical version of our world's history is set in contemporary times, the distinction becomes clear between alternate history on the one hand and contemporary fantasy, using in effect a form of secret history (as when Josepha Sherman's Son of Darkness has an elf living in New York City, in disguise) on the other. In works such as Robert A. Heinlein's Magic, Incorporated where a construction company can use magic to rig up stands at a sporting event and Poul Anderson's Operation Chaos and its sequel Operation Luna, where djinns are serious weapons of war—with atomic bombs—the use of magic throughout the United States and other modern countries makes it clear that this is not secret history—although references in Operation Chaos to degaussing the effects of cold iron make it possible that it is the result of a POD. The sequel clarifies this as the result of a collaboration of Einstein and Planck in 1901, resulting in the theory of "rhea tics". Henry Moseley applies this theory to "degauss the effects of cold iron and release the goetic forces." This results in the suppression of ferromagnetism and the re-emergence of magic and magical creatures. Alternate history shades off into other fantasy subgenres when the use of actual, though altered, history and geography decreases, although a culture may still be clearly the original source; Barry Hughart's Bridge of Birds and its sequels take place in a fantasy world, albeit one clearly based on China, and with allusions to actual Chinese history, such as the Empress Wu. Richard Garfinkle's Celestial Matters incorporates ancient Chinese physics and Greek Aristotelian physics, using them as if factual. Alternate history has long been a staple of Japanese speculative fiction with such authors as Futaro Yamada and Ryō Hanmura writing novels set in recognizable historical settings withaddded supernatural or science fiction elements. Ryō Hanmura's 1973 Musubi no Yama Hiroku which recreated 400 years of Japan's history from the perspective of a secret magical family with psychic abilities. The novel has since come to be recognized as a masterpiece of Japanese speculative fiction. Twelve years later, author Hiroshi Aramata wrote the groundbreaking Teito Monogatari which reimagined the history of Tokyo across the 20th century in a world heavily influenced by the supernatural. Television The TV show Sliders explores different possible alternate realities by having the protagonist "slide" into different parallel dimensions of the same planet Earth. Another TV show Motherland: Fort Salem explores a female-dominated world in which witchcraft is real. Its world diverged from our timeline when the Salem witch trials are resolved by an agreement between witches and ungifted humans. The anime Fena: Pirate Princess featured an alternate 18th century. The TV show The Man in the High Castle is an adaptation of the novel with the same name that ran for four seasons. Video games For the same reasons that this genre is explored by role-playing games, alternate history is also an intriguing backdrop for the storylines of many video games. A famous example of an alternate history game is Command & Conquer: Red Alert. Released in 1996, the game presents a point of divergence in 1946 in which Albert Einstein goes back in time to prevent World War II from ever taking place by erasing Adolf Hitler from time after he is released from Landsberg Prison in 1924. Einstein is successful in his mission, but in the process, he allows Joseph Stalin and the Soviet Union to become powerful enough to launch a massive campaign to conquer Europe. In the Civilization series, the player guides a civilization from prehistory to the present and creates radically altered versions of history on a long time scale. Several scenarios recreate a particular period, which becomes the "point of divergence" in an alternate history shaped by the player's actions. Popular examples in Sid Meier's Civilization IV include Desert War, set in the Mediterranean theatre of World War II and featuring scripted events tied to possible outcomes of battles; Broken Star, set in a hypothetical Russian civil war in 2010; and Rhye's and Fall of Civilization, an 'Earth simulator' designed to mirror a history as closely as possible but incorporating unpredictable elements to provide realistic alternate settings. In some games such as the Metal Gear and Resident Evil series, events that were originally intended to represent the near future when the games were originally released later ended up becoming alternate histories in later entries in those franchises. For example, Metal Gear 2: Solid Snake (1990), set in 1999, depicted a near future that ended up becoming an alternate history in Metal Gear Solid (1998). Likewise, Resident Evil (1996) and Resident Evil 2 (1998), both set in 1998, depicted near-future events that had later become an alternative history by the time Resident Evil 4 (2005) was released. In the 2009 steampunk shooter, Damnation is set on an alternate version of planet Earth, in the early 20th century after the American Civil War, which had spanned over several decades, and steam engines replace combustion engines. The game sees the protagonists fighting off a rich industrialist who wants to do away with both the Union and the Confederacy in one swift movement and turn the United States of America into a country called the "American Empire" with a totalitarian dictatorship. Crimson Skies is one example of an alternate history spawning multiple interpretations in multiple genres. The stories and games in Crimson Skies take place in an alternate 1930s United States in which the nation crumbled into many hostile states following the effects of the Great Depression, the Great War, and Prohibition. With the road and railway system destroyed, commerce took to the skies, which led to the emergence of air pirate gangs who plunder the aerial commerce. The game Freedom Fighters portrays a situation similar to that of the movie Red Dawn and Red Alert 2 but less comically than the latter. The point of divergence is during World War II in which the Soviet Union develops an atomic bomb first and uses it on Berlin. With the balance of power and influence tipped in Russia's favor, history diverges. Brief summaries at the beginning of the game inform the player of the Communist bloc's complete takeover of Europe by 1953, a different ending to the Cuban Missile Crisis, and the spread of Soviet influence into South America and Mexico. Similarly, the 2007 video game World in Conflict is set in 1989, with the Soviet Union on the verge of collapse. The point of divergence is several months before the opening of the game, when Warsaw Pact forces staged a desperate invasion of Western Europe. As the game begins, a Soviet invasion force lands in Seattle and takes advantage of the fact that most of the US military is in Europe. The game Battlestations: Pacific, released in 2008, offered in alternate history campaign for the Imperial Japanese Navy in which Japan destroys all three carriers in the Battle of Midway, which is followed by a successful invasion of the island. That causes the United States to lack any sort of aerial power to fight the Japanese and to be continuously forced onto the defense. Turning Point: Fall of Liberty, released in February 2008, is an alternate history first-person shooter in which Winston Churchill died in 1931 from being struck by a taxi cab. Therefore, Great Britain lacks the charismatic leader needed to keep the country together and allows it to be successfully conquered by Nazi Germany during Operation Sea Lion in 1940. Germany later conquers the rest of Europe, as well as North Africa and the Middle East, and produces a massive number of Wunderwaffe. The Axis powers launch a surprise invasion of the isolationist United States in the Eastern Seaboard in 1953, which forces the country to surrender and submit to a puppet government. Another alternate history game involving Nazis is War Front: Turning Point in which Hitler died during the early days of World War II and so a much more effective leadership rose to power. Under the command of a new Führer (who is referred to as "Chancellor", with his real name never being revealed), Operation Sealion succeeds, and the Nazis successfully conquer Britain and spark a cold war between them and the Allied Powers. The Fallout series of role-playing games is set in a divergent US, whose history after World War II diverges from the real world to follow a retro-futuristic timeline. For example, fusion power was invented quite soon after the end of the war, but the transistor was never developed. The result was a future that has a 1950s "World of Tomorrow" feel to it, with extremely high technology like artificial intelligence implemented with thermionic valves and other technologies that are now considered obsolete. Many game series by the Swedish developer Paradox Interactive start at a concise point in history and allow the player to immerse in the role of a contemporary leader and alter the course of in-game history. The most prominent game with that setting is Crusader Kings II. S.T.A.L.K.E.R. games have an alternate history at the Chernobyl Exclusion Zone in which a special area called "The Zone" is formed. Wolfenstein: The New Order is set in an alternate 1960 in which the Nazis won World War II and do so also by acquiring high technology. The sequel Wolfenstein II: The New Colossus continues that but is set in the conquered United States of America. A game made by Paradox Interactive, "Alternate WWII: The Game" was supposed to release in June 2021, but was canceled. It was mostly secret but announced to the public when cancelled. Online Fans of alternate history have made use of the internet from a very early point to showcase their own works and provide useful tools for those fans searching for anything alternate history, first in mailing lists and usenet groups, later in web databases and forums. The "Usenet Alternate History List" was first posted on April 11, 1991, to the Usenet newsgroup rec.arts.sf-lovers. In May 1995, the dedicated newsgroup soc.history.what-if was created for showcasing and discussing alternate histories. Its prominence declined with the general migration from unmoderated usenet to moderated web forums, most prominently AlternateHistory.com, the self-described "largest gathering of alternate history fans on the internet" with over 10,000 active members. In addition to these discussion forums, in 1997 Uchronia: The Alternate History List was created as an online repository, now containing over 2,900 alternate history novels, stories, essays, and other printed materials in several different languages. Uchronia was selected as the Sci Fi Channel's "Sci Fi Site of the Week" twice. See also 20th century in science fiction Alien space bats Alternate ending Alternative

writing it was to set out his social and political ideas, the plot serving mainly as a vehicle to expound them. This book introduced the idea of a person being transported from a point in our familiar world to the precise geographical equivalent point in an alternate world in which history had gone differently. The protagonists undergo various adventures in the alternate world, and then are finally transported back to our world, again to the precise geographical equivalent point. Since then, that has become a staple of the alternate history genre. A number of alternate history stories and novels appeared in the late 19th and early 20th centuries (see, for example, Joseph Edgar Chamberlin's The Ifs of History [1907] and Charles Petrie's If: A Jacobite Fantasy [1926]). In 1931, British historian Sir John Squire collected a series of essays from some of the leading historians of the period for his anthology If It Had Happened Otherwise. In that work, scholars from major universities, as well as important non-academic authors, turned their attention to such questions as "If the Moors in Spain Had Won" and "If Louis XVI Had Had an Atom of Firmness". The essays range from serious scholarly efforts to Hendrik Willem van Loon's fanciful and satiric portrayal of an independent 20th-century New Amsterdam, a Dutch city-state on the island of Manhattan. Among the authors included were Hilaire Belloc, André Maurois, and Winston Churchill. One of the entries in Squire's volume was Churchill's "If Lee Had Not Won the Battle of Gettysburg", written from the viewpoint of a historian in a world in which the Confederacy had won the American Civil War. The entry considers what would have happened if the North had been victorious (in other words, a character from an alternate world imagines a world more like the real one we live in, although it is not identical in every detail). Speculative work that narrates from the point of view of an alternate history is variously known as "recursive alternate history", a "double-blind what-if", or an "alternate-alternate history". Churchill's essay was one of the influences behind Ward Moore's alternate history novel Bring the Jubilee in which General Robert E. Lee won the Battle of Gettysburg and paved the way for the eventual victory of the Confederacy in the American Civil War (named the "War of Southron Independence" in this timeline). The protagonist, the autodidact Hodgins Backmaker, travels back to the aforementioned battle and inadvertently changes history, which results in the emergence of our own timeline and the consequent victory of the Union instead. The American humorist author James Thurber parodied alternate history stories about the American Civil War in his 1930 story "If Grant Had Been Drinking at Appomattox", which he accompanied with this very brief introduction: "Scribner's magazine is publishing a series of three articles: 'If Booth Had Missed Lincoln', 'If Lee Had Won the Battle of Gettysburg', and 'If Napoleon Had Escaped to America'. This is the fourth". Another example of alternate history from this period (and arguably the first that explicitly posited cross-time travel from one universe to another as anything more than a visionary experience) is H.G. Wells' Men Like Gods (1923) in which the London-based journalist Mr. Barnstable, along with two cars and their passengers, is mysteriously teleported into "another world", which the "Earthlings" call Utopia. Being far more advanced than Earth, Utopia is some 3000 years ahead of humanity in its development. Wells describes a multiverse of alternative worlds, complete with the paratime travel machines that would later become popular with American pulp writers. However, since his hero experiences only a single alternate world, the story is not very different from conventional alternate history. In the 1930s, alternate history moved into a new arena. The December 1933 issue of Astounding published Nat Schachner's "Ancestral Voices", which was quickly followed by Murray Leinster's "Sidewise in Time". While earlier alternate histories examined reasonably-straightforward divergences, Leinster attempted something completely different. In his "World gone mad", pieces of Earth traded places with their analogs from different timelines. The story follows Professor Minott and his students from a fictitious Robinson College as they wander through analogues of worlds that followed a different history. A somewhat similar approach was taken by Robert A. Heinlein in his 1941 novelette Elsewhen in which a professor trains his mind to move his body across timelines. He then hypnotizes his students so that they can explore more of them. Eventually, each settles into the reality that is most suitable for him or her. Some of the worlds they visit are mundane, some are very odd, and others follow science fiction or fantasy conventions. World War II produced alternate history for propaganda: both British and American authors wrote works depicting Nazi invasions of their respective countries as cautionary tales. Time travel to create historical divergences The period around World War II also saw the publication of the time travel novel Lest Darkness Fall by L. Sprague de Camp in which an American academic travels to Italy at the time of the Byzantine invasion of the Ostrogoths. De Camp's time traveler, Martin Padway, is depicted as making permanent historical changes and implicitly forming a new time branch, thereby making the work an alternate history. In William Tenn's short story Brooklyn Project (1948), a tyrannical US Government brushes aside the warnings of scientists about the dangers of time travel and goes on with a planned experiment - with the result that minor changes to the prehistoric past cause Humanity to never have existed, its place taken by tentacled underwater intelligent creatures - who also have a tyrannical government which also insists on experimenting with time-travel. Time travel as the cause of a point of divergence (POD), which can denote either the bifurcation of a historical timeline or a simple replacement of the future that existed before the time-travelling event, has continued to be a popular theme. In Ward Moore's Bring the Jubilee, the protagonist lives in an alternate history in which the Confederacy has won the American Civil War. He travels backward through time and brings about a Union victory at the Battle of Gettysburg. When a story's assumptions about the nature of time travel lead to the complete replacement of the visited time's future, rather than just the creation of an additional time line, the device of a "time patrol" is often used where guardians move through time to preserve the "correct" history. A more recent example is Making History by Stephen Fry in which a time machine is used to alter history so that Adolf Hitler was never born. That ironically results in a more competent leader of Nazi Germany and results in the country's ascendancy and longevity in the altered timeline. Cross-time stories H.G. Wells' "cross-time" or "many universes" variant (see above) was fully developed by Murray Leinster in his 1934 short story "Sidewise in Time", in which sections of the Earth's surface begin changing places with their counterparts in alternate timelines. Fredric Brown employed this subgenre to satirize the science fiction pulps and their adolescent readers—and fears of foreign invasion—in the classic What Mad Universe (1949). In Clifford D. Simak's Ring Around the Sun (1953), the hero ends up in an alternate earth of thick forests in which humanity never developed but a band of mutants is establishing a colony; the story line appears to frame the author's anxieties regarding McCarthyism and the Cold War. Quantum theory of many worlds While many justifications for alternate histories involve a multiverse, the "many world" theory would naturally involve many worlds, in fact a continually exploding array of universes. In quantum theory, new worlds would proliferate with every quantum event, and even if the writer uses human decisions, every decision that could be made differently would result in a different timeline. A writer's fictional multiverse may, in fact, preclude some decisions as humanly impossible, as when, in Night Watch, Terry Pratchett depicts a character informing Vimes that while anything that can happen, has happened, nevertheless there is no history whatsoever in which Vimes has ever murdered his wife. When the writer explicitly maintains that all possible decisions are made in all possible ways, one possible conclusion is that the characters were neither brave, nor clever, nor skilled, but simply lucky enough to happen on the universe in which they did not choose the cowardly route, take the stupid action, fumble the crucial activity, etc.; few writers focus on this idea, although it has been explored in stories such as Larry Niven's story All the Myriad Ways, where the reality of all possible universes leads to an epidemic of suicide and crime because people conclude their choices have no moral import. In any case, even if it is true that every possible outcome occurs in some world, it can still be argued that traits such as bravery and intelligence might still affect the relative frequency of worlds in which better or worse outcomes occurred (even if the total number of worlds with each type of outcome is infinite, it is still possible to assign a different measure to different infinite sets). The physicist David Deutsch, a strong advocate of the many-worlds interpretation of quantum mechanics, has argued along these lines, saying that "By making good choices, doing the right thing, we thicken the stack of universes in which versions of us live reasonable lives. When you succeed, all the copies of you who made the same decision succeed too. What you do for the better increases the portion of the multiverse where good things happen." This view is perhaps somewhat too abstract to be explored directly in science fiction stories, but a few writers have tried, such as Greg Egan in his short story The Infinite Assassin, where an agent is trying to contain reality-scrambling "whirlpools" that form around users of a certain drug, and the agent is constantly trying to maximize the consistency of behavior among his alternate selves, attempting to compensate for events and thoughts he experiences, he guesses are of low measure relative to those experienced by most of his other selves. Many writers—perhaps the majority—avoid the discussion entirely. In one novel of this type, H. Beam Piper's Lord Kalvan of Otherwhen, a Pennsylvania State Police officer, who knows how to make gunpowder, is transported from our world to an alternate universe where the recipe for gunpowder is a tightly held secret and saves a country that is about to be conquered by its neighbors. The paratime patrol members are warned against going into the timelines immediately surrounding it, where the country will be overrun, but the book never depicts the slaughter of the innocent thus entailed, remaining solely in the timeline where the country is saved. The cross-time theme was further developed in the 1960s by Keith Laumer in the first three volumes of his Imperium sequence, which would be completed in Zone Yellow (1990). Piper's politically more sophisticated variant was adopted and adapted by Michael Kurland and Jack Chalker in the 1980s; Chalker's G.O.D. Inc trilogy (1987–89), featuring paratime detectives Sam and Brandy Horowitz, marks the first attempt at merging the paratime thriller with the police procedural. Kurland's Perchance (1988), the first volume of the never-completed "Chronicles of Elsewhen", presents a multiverse of secretive cross-time societies that utilize a variety of means for cross-time travel, ranging from high-tech capsules to mutant powers. Harry Turtledove has launched the Crosstime Traffic series for teenagers featuring a variant of H. Beam Piper's paratime trading empire. Rival paratime worlds The concept of a cross-time version of a world war, involving rival paratime empires, was developed in Fritz Leiber's Change War series, starting with the Hugo Award winning The Big Time (1958); followed by Richard C. Meredith's Timeliner trilogy in the 1970s, Michael McCollum's A Greater Infinity (1982) and John Barnes' Timeline Wars trilogy in the 1990s. Such "paratime" stories may include speculation that the laws of nature can vary from one universe to the next, providing a science fictional explanation—or veneer—for what is normally fantasy. Aaron Allston's Doc Sidhe and Sidhe Devil take place between our world, the "grim world" and an alternate "fair world" where the Sidhe retreated to. Although technology is clearly present in both worlds, and the "fair world" parallels our history, about fifty years out of step, there is functional magic in the fair world. Even with such explanation, the more explicitly the alternate world resembles a normal fantasy world, the more likely the story is to be labelled fantasy, as in Poul Anderson's "House Rule" and "Loser's Night". In both science fiction and fantasy, whether a given parallel universe is an alternate history may not be clear. The writer might allude to a POD only to explain the existence and make no use of the concept, or may present the universe without explanation of its existence. Major writers explore alternate histories Isaac Asimov's short story "What If—" (1952) is about a couple who can explore alternate realities by means of a television-like device. This idea can also be found in Asimov's novel The End of Eternity (1955), in which the "Eternals" can change the realities of the world, without people being aware of it. Poul Anderson's Time Patrol stories feature conflicts between forces intent on changing history and the Patrol who work to preserve it. One story, Delenda Est, describes a world in which Carthage triumphed over the Roman Republic. The Big Time, by Fritz Leiber, describes a Change War ranging across all of history. Keith Laumer's Worlds of the Imperium is one of the earliest alternate history novels; it was published by Fantastic Stories of the Imagination in 1961, in magazine form, and reprinted by Ace Books in 1962 as one half of an Ace Double. Besides our world, Laumer describes a world ruled by an Imperial aristocracy formed by the merger of European empires, in which the American Revolution never happened, and a third world in post-war chaos ruled by the protagonist's doppelganger. Philip K. Dick's novel, The Man in the High Castle (1962), is an alternate history in which Nazi Germany and Imperial Japan won World War II. This book contains an example of "alternate-alternate" history, in that one of its characters authored a book depicting a reality in which the Allies won the war, itself divergent from real-world history in several aspects. The several characters live within a divided United States, in which the Empire of Japan takes the Pacific states, governing them as a puppet, Nazi Germany takes the East Coast of the United States and parts of the Midwest, with the remnants of the old United States' government as the Neutral Zone, a buffer state between the two superpowers. The book has inspired an Amazon series of the same name. Vladimir Nabokov's novel, Ada or Ardor: A Family Chronicle (1969), is a story of incest that takes place within an alternate North America settled in part by Czarist Russia and that borrows from Dick's idea of "alternate-alternate" history (the world of Nabokov's hero is wracked by rumors of a "counter-earth" that apparently is ours). Some critics believe that the references to a counter-earth suggest that the world portrayed in Ada is a delusion in the mind of the hero (another favorite theme of Dick's novels). Strikingly, the characters in Ada seem to acknowledge their own world as the copy or negative version, calling it "Anti-Terra", while its mythical twin is the real "Terra". Like history, science has followed a divergent path on Anti-Terra: it boasts all the same technology as our world, but all based on water instead of electricity; e.g., when a character in Ada makes a long-distance call, all the toilets in the house flush at once to provide hydraulic power. Guido Morselli described the defeat of Italy (and subsequently France) in World War I in his novel, Past Conditional (1975; ), wherein the static Alpine front line which divided Italy from Austria during that war collapses when the Germans and the Austrians forsake trench warfare and adopt blitzkrieg twenty years in advance. Kingsley Amis set his novel, The Alteration (1976), in the 20th century, but major events in the Reformation did not take place, and Protestantism is limited to the breakaway Republic of New England. Martin Luther was reconciled to the Roman Catholic Church and later became Pope Germanian I. In Nick Hancock and Chris England's 1997 book What Didn't Happen Next: An Alternative History of Football it is suggested that, had Gordon Banks been fit to play in the 1970 FIFA World Cup quarter-final, there would have been no Thatcherism and the post-war consensus would have continued indefinitely. Kim Stanley Robinson's novel, The Years of Rice and Salt (2002), starts at the point of divergence with Timur turning his army away from Europe, and the Black Death has killed 99% of Europe's population, instead of only a third. Robinson explores world history from that point in AD 1405 (807 AH) to about AD 2045 (1467 AH). Rather than following the great man theory of history, focusing on leaders, wars, and major events, Robinson writes more about social history, similar to the Annales School of history theory and Marxist historiography, focusing on the lives of ordinary people living in their time and place. Philip Roth's novel, The Plot Against America (2004), looks at an America where Franklin D. Roosevelt is defeated in 1940 in his bid for a third term as President of the United States, and Charles Lindbergh is elected, leading to a US that features increasing fascism and anti-Semitism. Michael Chabon, occasionally an author of speculative fiction, contributed to the genre with his novel The Yiddish Policemen's Union (2007), which explores a world in which the State of Israel was destroyed in its infancy and many of the world's Jews instead live in a small strip of Alaska set aside by the US government for Jewish settlement. The story follows a Jewish detective solving a murder case in the Yiddish-speaking semi-autonomous city state of Sitka. Stylistically, Chabon borrows heavily from the noir and detective fiction genres, while exploring social issues related to Jewish history and culture. Apart from the alternate history of the Jews and Israel, Chabon also plays with other common tropes of alternate history fiction; in the book, Germany actually loses the war even harder than they did in reality, getting hit with a nuclear bomb instead of just simply losing a ground war (subverting the common "what if Germany won WWII?" trope). Contemporary alternate history in popular literature The late 1980s and the 1990s saw a boom in popular-fiction versions of alternate history, fueled by the emergence of the prolific alternate history author Harry Turtledove, as well as the development of the steampunk genre and two series of anthologies—the What Might Have Been series edited by Gregory Benford and the Alternate ... series edited by Mike Resnick. This period also saw alternate history works by S. M. Stirling, Kim Stanley Robinson, Harry Harrison, Howard Waldrop, Peter Tieryas, and others. In 1986, a sixteen-part epic comic book series called Captain Confederacy began examining a world where the Confederate States of America won the American Civil War. In the series, the Captain and others heroes are staged government propaganda events featuring the feats of these superheroes. Since the late 1990s, Harry Turtledove has been the most prolific practitioner of alternate history and has been given the title "Master of Alternate History" by some. His books include those of Timeline 191 (a.k.a. Southern Victory, also known as TL-191), in which, while the Confederate States of America won the American Civil War, the Union and Imperial Germany defeat the Entente Powers in the two "Great War"s of the 1910s and 1940s (with a Nazi-esque Confederate government attempting to exterminate its Black population), and the Worldwar series, in which aliens invaded Earth during World War II. Other stories by Turtledove include A Different Flesh, in which America was not colonized from Asia during the last ice age; In the Presence of Mine Enemies, in which the Nazis won World War II; and Ruled Britannia, in which the Spanish Armada succeeded in conquering England in the Elizabethan era, with William Shakespeare being given the task of writing the play that will motivate the Britons to rise up against their Spanish conquerors. He also co-authored a book with actor Richard Dreyfuss, The Two Georges, in which the United Kingdom retained the American colonies, with George Washington and King George III making peace. He did a two-volume series in which the Japanese not only bombed Pearl Harbor but also invaded and occupied the Hawaiian Islands. Perhaps the most incessantly explored theme in popular alternate history focuses on worlds in which the Nazis won World War Two. In some versions, the Nazis and/or Axis Powers conquer the entire world; in others, they conquer most of the world but a "Fortress America" exists under siege; while in others, there is a Nazi/Japanese Cold War comparable to the US/Soviet equivalent in 'our' timeline. Fatherland (1992), by Robert Harris, is set in Europe following the Nazi victory. The novel Dominion by C.J. Sansom (2012) is similar in concept but is set in England, with Churchill the leader of an anti-German Resistance and other historic persons in various fictional roles. In the Mecha Samurai Empire series (2016), Peter Tieryas focuses on the

1s (pronounced as the individual numbers and letters: "'one' 'ess'") is the lowest energy level () and has an angular quantum number of , denoted as s. Orbitals with are denoted as p, d and f respectively. The set of orbitals for a given n and is called a subshell, denoted . The exponent y shows the number of electrons in the subshell. For example, the notation 2p4 indicates that the 2p subshell of an atom contains 4 electrons. This subshell has 3 orbitals, each with n = 2 and = 1. X-ray notation There is also another, less common system still used in X-ray science known as X-ray notation, which is a continuation of the notations used before orbital theory was well understood. In this system, the principal quantum number is given a letter associated with it. For , the letters associated with those numbers are K, L, M, N, O, ... respectively. Hydrogen-like orbitals The simplest atomic orbitals are those that are calculated for systems with a single electron, such as the hydrogen atom. An atom of any other element ionized down to a single electron is very similar to hydrogen, and the orbitals take the same form. In the Schrödinger equation for this system of one negative and one positive particle, the atomic orbitals are the eigenstates of the Hamiltonian operator for the energy. They can be obtained analytically, meaning that the resulting orbitals are products of a polynomial series, and exponential and trigonometric functions. (see hydrogen atom). For atoms with two or more electrons, the governing equations can only be solved with the use of methods of iterative approximation. Orbitals of multi-electron atoms are qualitatively similar to those of hydrogen, and in the simplest models, they are taken to have the same form. For more rigorous and precise analysis, numerical approximations must be used. A given (hydrogen-like) atomic orbital is identified by unique values of three quantum numbers: , , and . The rules restricting the values of the quantum numbers, and their energies (see below), explain the electron configuration of the atoms and the periodic table. The stationary states (quantum states) of the hydrogen-like atoms are its atomic orbitals. However, in general, an electron's behavior is not fully described by a single orbital. Electron states are best represented by time-depending "mixtures" (linear combinations) of multiple orbitals. See Linear combination of atomic orbitals molecular orbital method. The quantum number first appeared in the Bohr model where it determines the radius of each circular electron orbit. In modern quantum mechanics however, determines the mean distance of the electron from the nucleus; all electrons with the same value of n lie at the same average distance. For this reason, orbitals with the same value of n are said to comprise a "shell". Orbitals with the same value of n and also the same value of are even more closely related, and are said to comprise a "subshell". Quantum numbers Because of the quantum mechanical nature of the electrons around a nucleus, atomic orbitals can be uniquely defined by a set of integers known as quantum numbers. These quantum numbers only occur in certain combinations of values, and their physical interpretation changes depending on whether real or complex versions of the atomic orbitals are employed. Complex orbitals In physics, the most common orbital descriptions are based on the solutions to the hydrogen atom, where orbitals are given by the product between a radial function and a pure spherical harmonic. The quantum numbers, together with the rules governing their possible values, are as follows: The principal quantum number describes the energy of the electron and is always a positive integer. In fact, it can be any positive integer, but for reasons discussed below, large numbers are seldom encountered. Each atom has, in general, many orbitals associated with each value of n; these orbitals together are sometimes called electron shells. The azimuthal quantum number describes the orbital angular momentum of each electron and is a non-negative integer. Within a shell where is some integer , ranges across all (integer) values satisfying the relation . For instance, the shell has only orbitals with , and the shell has only orbitals with , and . The set of orbitals associated with a particular value of are sometimes collectively called a subshell. The magnetic quantum number, , describes the magnetic moment of an electron in an arbitrary direction, and is also always an integer. Within a subshell where is some integer , ranges thus: . The above results may be summarized in the following table. Each cell represents a subshell, and lists the values of available in that subshell. Empty cells represent subshells that do not exist. Subshells are usually identified by their - and -values. is represented by its numerical value, but is represented by a letter as follows: 0 is represented by 's', 1 by 'p', 2 by 'd', 3 by 'f', and 4 by 'g'. For instance, one may speak of the subshell with and as a '2s subshell'. Each electron also has a spin quantum number, s, which describes the spin of each electron (spin up or spin down). The number s can be + or −. The Pauli exclusion principle states that no two electrons in an atom can have the same values of all four quantum numbers. If there are two electrons in an orbital with given values for three quantum numbers, (, , ), these two electrons must differ in their spin. The above conventions imply a preferred axis (for example, the z direction in Cartesian coordinates), and they also imply a preferred direction along this preferred axis. Otherwise there would be no sense in distinguishing from . As such, the model is most useful when applied to physical systems that share these symmetries. The Stern–Gerlach experiment — where an atom is exposed to a magnetic field — provides one such example. Real orbitals In addition to the complex orbitals described above, it is common, especially in the chemistry literature, to utilize real atomic orbitals. These real orbitals arise from simple linear combinations of the complex orbitals. Using the Condon-Shortley phase convention, the real atomic orbitals are related to the complex atomic orbitals in the same way that the real spherical harmonics are related to the complex spherical harmonics. Letting denote a complex atomic orbital with quantum numbers , , and , we define the real atomic orbitals by If , with the radial part of the orbital, this definition is equivalent to where is the real spherical harmonic related to either the real or imaginary part of the complex spherical harmonic . Real spherical harmonics are physically relevant when an atom is embedded in a crystalline solid, in which case there are multiple preferred symmetry axes but no single preferred direction . Real atomic orbitals are also more frequently encountered in introductory chemistry textbooks and shown in common orbital visualizations. In the real hydrogen-like orbitals, the quantum numbers and have the same interpretation and significance as their complex counterparts, but is no longer a good quantum number (though its absolute value is). Some real atomic orbitals are given specific names beyond the simple designation. Orbitals with quantum number equal to are referred to as orbitals. With this it already possible to assigns names to complex orbitals such as where the first symbol is the quantum number, the second number is the symbol for that particular quantum number and the subscript is the quantum number. As an example of how the full orbital names are generated for real orbitals, we may calculate . From the table of spherical harmonics, we have that with . We then have Likewise we have . As a more complicated example, we also have In all of these cases we generate a Cartesian label for the orbital by examining, and abbreviating, the polynomial in , , and appearing in the numerator. We ignore any terms in the polynomial except for the term with the highest exponent in . We then use the abbreviated polynomial as a subscript label for the atomic state, using the same nomenclature as above to indicate the and quantum numbers. Note that the expression above all use the Condon-Shortley phase convention which is favored by quantum physicists. Other conventions for the phase of the spherical harmonics exists. Under these different conventions the and orbitals may appear, for example, as the sum and difference of and , contrary to what is shown above. Below is a tabulation of these Cartesian polynomial names for the atomic orbitals. Note that there does not seem to be reference in the literature as to how to abbreviate the lengthy Cartesian spherical harmonic polynomials for so there does not seem be consensus as to the naming of orbitals or higher according to this nomenclature. Shapes of orbitals Simple pictures showing orbital shapes are intended to describe the angular forms of regions in space where the electrons occupying the orbital are likely to be found. The diagrams cannot show the entire region where an electron can be found, since according to quantum mechanics there is a non-zero probability of finding the electron (almost) anywhere in space. Instead the diagrams are approximate representations of boundary or contour surfaces where the probability density has a constant value, chosen so that there is a certain probability (for example 90%) of finding the electron within the contour. Although as the square of an absolute value is everywhere non-negative, the sign of the wave function is often indicated in each subregion of the orbital picture. Sometimes the function will be graphed to show its phases, rather than the which shows probability density but has no phases (which have been lost in the process of taking the absolute value, since is a complex number). orbital graphs tend to have less spherical, thinner lobes than graphs, but have the same number of lobes in the same places, and otherwise are recognizable. This article, in order to show wave function phases, shows mostly graphs. The lobes can be viewed as standing wave interference patterns between the two counter rotating, ring resonant travelling wave "" and "" modes, with the projection of the orbital onto the xy plane having a resonant "" wavelengths around the circumference. Though rarely depicted, the travelling wave solutions can be viewed as rotating banded tori, with the bands representing phase information. For each there are two standing wave solutions and . For the case where the orbital is vertical, counter rotating information is unknown, and the orbital is z-axis symmetric. For the case where there are no counter rotating modes. There are only radial modes and the shape is spherically symmetric. For any given , the smaller is, the more radial nodes there are. For any given , the smaller is, the fewer radial nodes there are (zero for whichever first has that orbital). Loosely speaking is energy, is analogous to eccentricity, and is orientation. In the classical case, a ring resonant travelling wave, for example in a circular transmission line, unless actively forced, will spontaneously decay into a ring resonant standing wave because reflections will build up over time at even the smallest imperfection or discontinuity. Generally speaking, the number determines the size and energy of the orbital for a given nucleus: as increases, the size of the orbital increases. When comparing different elements, the higher nuclear charge of heavier elements causes their orbitals to contract by comparison to lighter ones, so that the overall size of the whole atom remains very roughly constant, even as the number of electrons in heavier elements (higher ) increases. Also in general terms, determines an orbital's shape, and its orientation. However, since some orbitals are described by equations in complex numbers, the shape sometimes depends on also. Together, the whole set of orbitals for a given and fill space as symmetrically as possible, though with increasingly complex sets of lobes and nodes. The single s-orbitals () are shaped like spheres. For it is roughly a solid ball (it is most dense at the center and fades exponentially outwardly), but for or more, each single s-orbital is composed of spherically symmetric surfaces which are nested shells (i.e., the "wave-structure" is radial, following a sinusoidal radial component as well). See illustration of a cross-section of these nested shells, at right. The s-orbitals for all numbers are the only orbitals with an anti-node (a region of high wave function density) at the center of the nucleus. All other orbitals (p, d, f, etc.) have angular momentum, and thus avoid the nucleus (having a wave node at the nucleus). Recently, there has been an effort to experimentally image the 1s and 2p orbitals in a SrTiO3 crystal using scanning transmission electron microscopy with energy dispersive x-ray spectroscopy. Because the imaging was conducted using an electron beam, Coulombic beam-orbital interaction that is often termed as the impact parameter effect is included in the final outcome (see the figure at right). The shapes of p, d and f-orbitals are described verbally here and shown graphically in the Orbitals table below. The three p-orbitals for have the form of two ellipsoids with a point of tangency at the nucleus (the two-lobed shape is sometimes referred to as a "dumbbell"—there are two lobes pointing in opposite directions from each other). The three p-orbitals in each shell are oriented at right angles to each other, as determined by their respective linear combination of values of . The overall result is a lobe pointing along each direction of the primary axes. Four of the five d-orbitals for look similar, each with four pear-shaped lobes, each lobe tangent at right angles to two others, and the centers of all four lying in one plane. Three of these planes are the xy-, xz-, and yz-planes—the lobes are between the pairs of primary axes—and the fourth has the centre along the x and y axes themselves. The fifth and final d-orbital consists of three regions of high probability density: a torus in between two pear-shaped regions placed symmetrically on its z axis. The overall total of 18 directional lobes point in every primary axis direction and between every pair. There are seven f-orbitals, each with shapes more complex than those of the d-orbitals. Additionally, as is the case with the s orbitals, individual p, d, f and g orbitals with values higher than the lowest possible value, exhibit an additional radial node structure which is reminiscent of harmonic waves of the same type, as compared with the lowest (or fundamental) mode of the wave. As with s orbitals, this phenomenon provides p, d, f, and g orbitals at the next higher possible value of (for example, 3p orbitals vs. the fundamental 2p), an additional node in each lobe. Still higher values of further increase the number of radial nodes, for each type of orbital. The shapes of atomic orbitals in one-electron atom are related to 3-dimensional spherical harmonics. These shapes are not unique, and any linear combination is valid, like a transformation to cubic harmonics, in fact it is possible to generate sets where all the d's are the same shape, just like the and are the same shape. Although individual orbitals are most often shown independent of each other, the orbitals coexist around the nucleus at the same time. Also, in 1927, Albrecht Unsöld proved that if one sums the electron density of all orbitals of a particular azimuthal quantum number of the same shell (e.g. all three 2p orbitals, or all five 3d orbitals) where each orbital is occupied by an electron or each is occupied by an electron pair, then all angular dependence disappears; that is, the resulting total density of all the atomic orbitals in that subshell (those with the same ) is spherical. This is known as Unsöld's theorem. Orbitals table This table shows all orbital configurations for the real hydrogen-like wave functions up to 7s, and therefore covers the simple electronic configuration for all elements in the periodic table up to radium. "ψ" graphs are shown with − and + wave function phases shown in two different colors (arbitrarily

an orbital visualization heavily influenced by the Hartree–Fock approximation, which is one way to reduce the complexities of molecular orbital theory. Types of orbitals Atomic orbitals can be the hydrogen-like "orbitals" which are exact solutions to the Schrödinger equation for a hydrogen-like "atom" (i.e., an atom with one electron). Alternatively, atomic orbitals refer to functions that depend on the coordinates of one electron (i.e., orbitals) but are used as starting points for approximating wave functions that depend on the simultaneous coordinates of all the electrons in an atom or molecule. The coordinate systems chosen for atomic orbitals are usually spherical coordinates in atoms and Cartesian in polyatomic molecules. The advantage of spherical coordinates (for atoms) is that an orbital wave function is a product of three factors each dependent on a single coordinate: . The angular factors of atomic orbitals generate s, p, d, etc. functions as real combinations of spherical harmonics (where and are quantum numbers). There are typically three mathematical forms for the radial functions which can be chosen as a starting point for the calculation of the properties of atoms and molecules with many electrons: The hydrogen-like atomic orbitals are derived from the exact solutions of the Schrödinger Equation for one electron and a nucleus, for a hydrogen-like atom. The part of the function that depends on the distance r from the nucleus has nodes (radial nodes) and decays as . The Slater-type orbital (STO) is a form without radial nodes but decays from the nucleus as does the hydrogen-like orbital. The form of the Gaussian type orbital (Gaussians) has no radial nodes and decays as . Although hydrogen-like orbitals are still used as pedagogical tools, the advent of computers has made STOs preferable for atoms and diatomic molecules since combinations of STOs can replace the nodes in hydrogen-like atomic orbital. Gaussians are typically used in molecules with three or more atoms. Although not as accurate by themselves as STOs, combinations of many Gaussians can attain the accuracy of hydrogen-like orbitals. History The term "orbital" was coined by Robert Mulliken in 1932 as an abbreviation for one-electron orbital wave function. However, the idea that electrons might revolve around a compact nucleus with definite angular momentum was convincingly argued at least 19 years earlier by Niels Bohr, and the Japanese physicist Hantaro Nagaoka published an orbit-based hypothesis for electronic behavior as early as 1904. Explaining the behavior of these electron "orbits" was one of the driving forces behind the development of quantum mechanics. Early models With J. J. Thomson's discovery of the electron in 1897, it became clear that atoms were not the smallest building blocks of nature, but were rather composite particles. The newly discovered structure within atoms tempted many to imagine how the atom's constituent parts might interact with each other. Thomson theorized that multiple electrons revolved in orbit-like rings within a positively charged jelly-like substance, and between the electron's discovery and 1909, this "plum pudding model" was the most widely accepted explanation of atomic structure. Shortly after Thomson's discovery, Hantaro Nagaoka predicted a different model for electronic structure. Unlike the plum pudding model, the positive charge in Nagaoka's "Saturnian Model" was concentrated into a central core, pulling the electrons into circular orbits reminiscent of Saturn's rings. Few people took notice of Nagaoka's work at the time, and Nagaoka himself recognized a fundamental defect in the theory even at its conception, namely that a classical charged object cannot sustain orbital motion because it is accelerating and therefore loses energy due to electromagnetic radiation. Nevertheless, the Saturnian model turned out to have more in common with modern theory than any of its contemporaries. Bohr atom In 1909, Ernest Rutherford discovered that the bulk of the atomic mass was tightly condensed into a nucleus, which was also found to be positively charged. It became clear from his analysis in 1911 that the plum pudding model could not explain atomic structure. In 1913, Rutherford's post-doctoral student, Niels Bohr, proposed a new model of the atom, wherein electrons orbited the nucleus with classical periods, but were only permitted to have discrete values of angular momentum, quantized in units h/2π. This constraint automatically permitted only certain values of electron energies. The Bohr model of the atom fixed the problem of energy loss from radiation from a ground state (by declaring that there was no state below this), and more importantly explained the origin of spectral lines. After Bohr's use of Einstein's explanation of the photoelectric effect to relate energy levels in atoms with the wavelength of emitted light, the connection between the structure of electrons in atoms and the emission and absorption spectra of atoms became an increasingly useful tool in the understanding of electrons in atoms. The most prominent feature of emission and absorption spectra (known experimentally since the middle of the 19th century), was that these atomic spectra contained discrete lines. The significance of the Bohr model was that it related the lines in emission and absorption spectra to the energy differences between the orbits that electrons could take around an atom. This was, however, not achieved by Bohr through giving the electrons some kind of wave-like properties, since the idea that electrons could behave as matter waves was not suggested until eleven years later. Still, the Bohr model's use of quantized angular momenta and therefore quantized energy levels was a significant step towards the understanding of electrons in atoms, and also a significant step towards the development of quantum mechanics in suggesting that quantized restraints must account for all discontinuous energy levels and spectra in atoms. With de Broglie's suggestion of the existence of electron matter waves in 1924, and for a short time before the full 1926 Schrödinger equation treatment of hydrogen-like atoms, a Bohr electron "wavelength" could be seen to be a function of its momentum, and thus a Bohr orbiting electron was seen to orbit in a circle at a multiple of its half-wavelength. The Bohr model for a short time could be seen as a classical model with an additional constraint provided by the 'wavelength' argument. However, this period was immediately superseded by the full three-dimensional wave mechanics of 1926. In our current understanding of physics, the Bohr model is called a semi-classical model because of its quantization of angular momentum, not primarily because of its relationship with electron wavelength, which appeared in hindsight a dozen years after the Bohr model was proposed. The Bohr model was able to explain the emission and absorption spectra of hydrogen. The energies of electrons in the n = 1, 2, 3, etc. states in the Bohr model match those of current physics. However, this did not explain similarities between different atoms, as expressed by the periodic table, such as the fact that helium (two electrons), neon (10 electrons), and argon (18 electrons) exhibit similar chemical inertness. Modern quantum mechanics explains this in terms of electron shells and subshells which can each hold a number of electrons determined by the Pauli exclusion principle. Thus the n = 1 state can hold one or two electrons, while the n = 2 state can hold up to eight electrons in 2s and 2p subshells. In helium, all n = 1 states are fully occupied; the same is true for n = 1 and n = 2 in neon. In argon, the 3s and 3p subshells are similarly fully occupied by eight electrons; quantum mechanics also allows a 3d subshell but this is at higher energy than the 3s and 3p in argon (contrary to the situation in the hydrogen atom) and remains empty. Modern conceptions and connections to the Heisenberg uncertainty principle Immediately after Heisenberg discovered his uncertainty principle, Bohr noted that the existence of any sort of wave packet implies uncertainty in the wave frequency and wavelength, since a spread of frequencies is needed to create the packet itself. In quantum mechanics, where all particle momenta are associated with waves, it is the formation of such a wave packet which localizes the wave, and thus the particle, in space. In states where a quantum mechanical particle is bound, it must be localized as a wave packet, and the existence of the packet and its minimum size implies a spread and minimal value in particle wavelength, and thus also momentum and energy. In quantum mechanics, as a particle is localized to a smaller region in space, the associated compressed wave packet requires a larger and larger range of momenta, and thus larger kinetic energy. Thus the binding energy to contain or trap a particle in a smaller region of space increases without bound as the region of space grows smaller. Particles cannot be restricted to a geometric point in space, since this would require an infinite particle momentum. In chemistry, Schrödinger, Pauling, Mulliken and others noted that the consequence of Heisenberg's relation was that the electron, as a wave packet, could not be considered to have an exact location in its orbital. Max Born suggested that the electron's position needed to be described by a probability distribution which was connected with finding the electron at some point in the wave-function which described its associated wave packet. The new quantum mechanics did not give exact results, but only the probabilities for the occurrence of a variety of possible such results. Heisenberg held that the path of a moving particle has no meaning if we cannot observe it, as we cannot with electrons in an atom. In the quantum picture of Heisenberg, Schrödinger and others, the Bohr atom number n for each orbital became known as an n-sphere in a three-dimensional atom and was pictured as the most probable energy of the probability cloud of the electron's wave packet which surrounded the atom. Orbital names Orbital notation and subshells Orbitals have been given names, which are usually given in the form: where X is the energy level corresponding to the principal quantum number ; type is a lower-case letter denoting the shape or subshell of the orbital, corresponding to the angular momentum quantum number . For example, the orbital 1s (pronounced as the individual numbers and letters: "'one' 'ess'") is the lowest energy level () and has an angular quantum number of , denoted as s. Orbitals with are denoted as p, d and f respectively. The set of orbitals for a given n and is called a subshell, denoted . The exponent y shows the number of electrons in the subshell. For example, the notation 2p4 indicates that the 2p subshell of an atom contains 4 electrons. This subshell has 3 orbitals, each with n = 2 and = 1. X-ray notation There is also another, less common system still used in X-ray science known as X-ray notation, which is a continuation of the notations used before orbital theory was well understood. In this system, the principal quantum number is given a letter associated with it. For , the letters associated with those numbers are K, L, M, N, O, ... respectively. Hydrogen-like orbitals The simplest atomic orbitals are those that are calculated for systems with a single electron, such as the hydrogen atom. An atom of any other element ionized down to a single electron is very similar to hydrogen, and the orbitals take the same form. In the Schrödinger equation for this system of one negative and one positive particle, the atomic orbitals are the eigenstates of the Hamiltonian operator for the energy. They can be obtained analytically, meaning that the resulting orbitals are products of a polynomial series, and exponential and trigonometric functions. (see hydrogen atom). For atoms with two or more electrons, the governing equations can only be solved with the use of methods of iterative approximation. Orbitals of multi-electron atoms are qualitatively similar to those of hydrogen, and in the simplest models, they are taken to have the same form. For more rigorous and precise analysis, numerical approximations must be used. A given (hydrogen-like) atomic orbital is identified by unique values of three quantum numbers: , , and . The rules restricting the values of the quantum numbers, and their energies (see below), explain the electron configuration of the atoms and the periodic table. The stationary states (quantum states) of the hydrogen-like atoms are its atomic orbitals. However, in general, an electron's behavior is not fully described by a single orbital. Electron states are best represented by time-depending "mixtures" (linear combinations) of multiple orbitals. See Linear combination of atomic orbitals molecular orbital method. The quantum number first appeared in the Bohr model where it determines the radius of each circular electron orbit. In modern quantum mechanics however, determines the mean distance of the electron from the nucleus; all electrons with the same value of n lie at the same average distance. For this reason, orbitals with the same value of n are said to comprise a "shell". Orbitals with the same value of n and also the same value of are even more closely related, and are said to comprise a "subshell". Quantum numbers Because of the quantum mechanical nature of the electrons around a nucleus, atomic orbitals can be uniquely defined by a set of integers known as quantum numbers. These quantum numbers only occur in certain combinations of values, and their physical interpretation changes depending on whether real or complex versions of the atomic orbitals are employed. Complex orbitals In physics, the most common orbital descriptions are based on the solutions to the hydrogen atom, where orbitals are given by the product between a radial function and a pure spherical harmonic. The quantum numbers, together with the rules governing their possible values, are as follows: The principal quantum number describes the energy of the electron and is always a positive integer. In fact, it can be any positive integer, but for reasons discussed below, large numbers are seldom encountered. Each atom has, in general, many orbitals associated with each value of n; these orbitals together are sometimes called electron shells. The azimuthal quantum number describes the orbital angular momentum of each electron and is a non-negative integer. Within a shell where is some integer , ranges across all (integer) values satisfying the relation . For instance, the shell has only orbitals with , and the shell has only orbitals with , and . The set of orbitals associated with a particular value of are sometimes collectively called a subshell. The magnetic quantum number, , describes the magnetic moment of an electron in an arbitrary direction, and is also always an integer. Within a subshell where is some integer , ranges thus: . The above results may be summarized in the following table. Each cell represents a subshell, and lists the values of available in that subshell. Empty cells represent subshells that do not exist. Subshells are usually identified by their - and -values. is represented by its numerical value, but is represented by a letter as follows: 0 is represented by 's', 1 by 'p', 2 by 'd', 3 by 'f', and 4 by 'g'. For instance, one may speak of the subshell with and as a '2s subshell'. Each electron also has a spin quantum number, s, which describes the spin of each electron (spin up or spin down). The number s can be + or −. The Pauli exclusion principle states that no two electrons in an atom can have the same values of all four quantum numbers. If there are two electrons in an orbital with given values for three quantum numbers, (, , ), these two electrons must differ in their spin. The above conventions imply a preferred axis (for example, the z direction in Cartesian coordinates), and they also imply a preferred direction along this preferred axis. Otherwise there would be no sense in distinguishing from . As such, the model is most useful when applied to physical systems that share these symmetries. The Stern–Gerlach experiment — where an atom is exposed to a magnetic field — provides one such example. Real orbitals In addition to the complex orbitals described above, it is common, especially in the chemistry literature, to utilize real atomic orbitals. These real orbitals arise from simple linear combinations of the complex orbitals. Using the Condon-Shortley phase convention, the real atomic orbitals are related to the complex atomic orbitals in the same way that the real spherical harmonics are related to the complex spherical harmonics. Letting denote a complex atomic orbital with quantum numbers , , and , we define the real atomic orbitals by If , with the radial part of the orbital, this definition is equivalent to where is the real spherical harmonic related to either the real or imaginary part of the complex spherical harmonic . Real spherical harmonics are physically relevant when an atom is embedded in a crystalline solid, in which case there are multiple preferred symmetry axes but no single preferred direction . Real atomic orbitals are also more frequently encountered in introductory chemistry textbooks and shown in common orbital visualizations. In the real hydrogen-like orbitals, the quantum numbers and have the same interpretation and significance as their complex counterparts, but is no longer a good quantum number (though its absolute value is). Some real atomic orbitals are given specific names beyond the simple designation. Orbitals with quantum number equal to are referred to as orbitals. With this it already possible to assigns names to complex orbitals such as where the first symbol is the quantum number, the second number is the symbol for that particular quantum number and the subscript is the quantum number. As an example of how the full orbital names are generated for real orbitals, we may calculate . From the table of spherical harmonics, we have that with . We then have Likewise we have . As a more complicated example, we also have In all of these cases we generate a Cartesian label for the orbital by examining, and abbreviating, the polynomial in , , and appearing in the numerator. We ignore any terms in the polynomial except for the term with the highest exponent in . We then use the abbreviated polynomial as a subscript label for the atomic state, using the same nomenclature as above to indicate the and quantum numbers. Note that the expression above all use the Condon-Shortley phase convention which is favored by quantum physicists. Other conventions for the phase of the spherical harmonics exists. Under these different conventions the and orbitals may appear, for example, as the sum and difference of and , contrary to what is shown above. Below is a tabulation of these Cartesian polynomial names for the atomic orbitals. Note that there does not seem to be reference in the literature as to how to abbreviate the lengthy Cartesian spherical harmonic polynomials for so there does not seem be consensus as to the naming of orbitals or higher according to this nomenclature. Shapes of orbitals Simple pictures showing orbital shapes are intended to describe the angular forms of regions in space where the electrons occupying the orbital are likely to be found. The diagrams cannot show

charged form , but this positive charge needs to be balanced by the state with just one C-terminal carboxylate group is negatively charged. This occurs halfway between the two carboxylate pKa values: pI = (pKa1 + pKa(R)), where pKa(R) is the side chain pKa. Similar considerations apply to other amino acids with ionizable side-chains, including not only glutamate (similar to aspartate), but also cysteine, histidine, lysine, tyrosine and arginine with positive side chains Amino acids have zero mobility in electrophoresis at their isoelectric point, although this behaviour is more usually exploited for peptides and proteins than single amino acids. Zwitterions have minimum solubility at their isoelectric point, and some amino acids (in particular, with nonpolar side chains) can be isolated by precipitation from water by adjusting the pH to the required isoelectric point. Physicochemical properties of amino acids The ca. 20 canonical amino acids can be classified according to their properties. Important factors are charge, hydrophilicity or hydrophobicity, size, and functional groups. These properties influence protein structure and protein–protein interactions. The water-soluble proteins tend to have their hydrophobic residues (Leu, Ile, Val, Phe, and Trp) buried in the middle of the protein, whereas hydrophilic side chains are exposed to the aqueous solvent. (Note that in biochemistry, a residue refers to a specific monomer within the polymeric chain of a polysaccharide, protein or nucleic acid.) The integral membrane proteins tend to have outer rings of exposed hydrophobic amino acids that anchor them into the lipid bilayer. Some peripheral membrane proteins have a patch of hydrophobic amino acids on their surface that locks onto the membrane. In similar fashion, proteins that have to bind to positively charged molecules have surfaces rich with negatively charged amino acids like glutamate and aspartate, while proteins binding to negatively charged molecules have surfaces rich with positively charged chains like lysine and arginine. For example, lysine and arginine are highly enriched in low complexity regions of nucleic-acid binding proteins. There are various hydrophobicity scales of amino acid residues. Some amino acids have special properties such as cysteine, that can form covalent disulfide bonds to other cysteine residues, proline that forms a cycle to the polypeptide backbone, and glycine that is more flexible than other amino acids. Furthermore, glycine and proline are highly enriched within low complexity regions of eukaryotic and prokaryotic proteins, whereas the opposite (under-represented) has been observed for highly reactive, or complex, or hydrophobic amino acids, such as cysteine, phenylalanine, tryptophan, methionine, valine, leucine, isoleucine. Many proteins undergo a range of posttranslational modifications, whereby additional chemical groups are attached to the amino acid side chains. Some modifications can produce hydrophobic lipoproteins, or hydrophilic glycoproteins. These type of modification allow the reversible targeting of a protein to a membrane. For example, the addition and removal of the fatty acid palmitic acid to cysteine residues in some signaling proteins causes the proteins to attach and then detach from cell membranes. Table of standard amino acid abbreviations and properties Although one-letter symbols are included in the table, IUPAC–IUBMB recommend that "Use of the one-letter symbols should be restricted to the comparison of long sequences". Two additional amino acids are in some species coded for by codons that are usually interpreted as stop codons: In addition to the specific amino acid codes, placeholders are used in cases where chemical or crystallographic analysis of a peptide or protein cannot conclusively determine the identity of a residue. They are also used to summarise conserved protein sequence motifs. The use of single letters to indicate sets of similar residues is similar to the use of abbreviation codes for degenerate bases. Unk is sometimes used instead of Xaa, but is less standard. Ter or * (from termination) is used in notation for mutations in proteins when a stop codon occurs. It correspond to no amino acid at all. In addition, many nonstandard amino acids have a specific code. For example, several peptide drugs, such as Bortezomib and MG132, are artificially synthesized and retain their protecting groups, which have specific codes. Bortezomib is Pyz–Phe–boroLeu, and MG132 is Z–Leu–Leu–Leu–al. To aid in the analysis of protein structure, photo-reactive amino acid analogs are available. These include photoleucine (pLeu) and photomethionine (pMet). Occurrence and functions in biochemistry Amino acids which have the amine group attached to the (alpha-) carbon atom next to the carboxyl group have particular importance. They are known as 2-, alpha-, or α-amino acids (generic formula in most cases, where R is an organic substituent known as a "side chain"); often the term "amino acid" is used to refer specifically to these. They include the 22 proteinogenic ("protein-building") amino acids, which combine into peptide chains ("polypeptides") to form the building blocks of a vast array of proteins. These are all L-stereoisomers ("left-handed" enantiomers), although a few D-amino acids ("right-handed") occur in bacterial envelopes, as a neuromodulator (D-serine), and in some antibiotics. Many proteinogenic and non-proteinogenic amino acids have biological functions. For example, in the human brain, glutamate (standard glutamic acid) and gamma-aminobutyric acid ("GABA", nonstandard gamma-amino acid) are, respectively, the main excitatory and inhibitory neurotransmitters. Hydroxyproline, a major component of the connective tissue collagen, is synthesised from proline. Glycine is a biosynthetic precursor to porphyrins used in red blood cells. Carnitine is used in lipid transport. Nine proteinogenic amino acids are called "essential" for humans because they cannot be produced from other compounds by the human body and so must be taken in as food. Others may be conditionally essential for certain ages or medical conditions. Essential amino acids may also vary from species to species. Because of their biological significance, amino acids are important in nutrition and are commonly used in nutritional supplements, fertilizers, feed, and food technology. Industrial uses include the production of drugs, biodegradable plastics, and chiral catalysts. Proteinogenic amino acids Amino acids are the precursors to proteins. They join by condensation reactions to form short polymer chains called peptides or longer chains called either polypeptides or proteins. These chains are linear and unbranched, with each amino acid residue within the chain attached to two neighboring amino acids. In Nature, the process of making proteins encoded by DNA/RNA genetic material is called translation and involves the step-by-step addition of amino acids to a growing protein chain by a ribozyme that is called a ribosome. The order in which the amino acids are added is read through the genetic code from an mRNA template, which is an RNA copy of one of the organism's genes. Twenty-two amino acids are naturally incorporated into polypeptides and are called proteinogenic or natural amino acids. Of these, 20 are encoded by the universal genetic code. The remaining 2, selenocysteine and pyrrolysine, are incorporated into proteins by unique synthetic mechanisms. Selenocysteine is incorporated when the mRNA being translated includes a SECIS element, which causes the UGA codon to encode selenocysteine instead of a stop codon. Pyrrolysine is used by some methanogenic archaea in enzymes that they use to produce methane. It is coded for with the codon UAG, which is normally a stop codon in other organisms. This UAG codon is followed by a PYLIS downstream sequence. Several independent evolutionary studies have suggested that Gly, Ala, Asp, Val, Ser, Pro, Glu, Leu, Thr may belong to a group of amino acids that constituted the early genetic code, whereas Cys, Met, Tyr, Trp, His, Phe may belong to a group of amino acids that constituted later additions of the genetic code. Standard vs nonstandard amino acids The 20 amino acids that are encoded directly by the codons of the universal genetic code are called standard or canonical amino acids. A modified form of methionine (N-formylmethionine) is often incorporated in place of methionine as the initial amino acid of proteins in bacteria, mitochondria and chloroplasts. Other amino acids are called nonstandard or non-canonical. Most of the nonstandard amino acids are also non-proteinogenic (i.e. they cannot be incorporated into proteins during translation), but two of them are proteinogenic, as they can be incorporated translationally into proteins by exploiting information not encoded in the universal genetic code. The two nonstandard proteinogenic amino acids are selenocysteine (present in many non-eukaryotes as well as most eukaryotes, but not coded directly by DNA) and pyrrolysine (found only in some archaea

initial amino acid of proteins in bacteria, mitochondria and chloroplasts. Other amino acids are called nonstandard or non-canonical. Most of the nonstandard amino acids are also non-proteinogenic (i.e. they cannot be incorporated into proteins during translation), but two of them are proteinogenic, as they can be incorporated translationally into proteins by exploiting information not encoded in the universal genetic code. The two nonstandard proteinogenic amino acids are selenocysteine (present in many non-eukaryotes as well as most eukaryotes, but not coded directly by DNA) and pyrrolysine (found only in some archaea and at least one bacterium). The incorporation of these nonstandard amino acids is rare. For example, 25 human proteins include selenocysteine in their primary structure, and the structurally characterized enzymes (selenoenzymes) employ selenocysteine as the catalytic moiety in their active sites. Pyrrolysine and selenocysteine are encoded via variant codons. For example, selenocysteine is encoded by stop codon and SECIS element. N-formylmethionine (which is often the initial amino acid of proteins in bacteria, mitochondria, and chloroplasts) is generally considered as a form of methionine rather than as a separate proteinogenic amino acid. Codon–tRNA combinations not found in nature can also be used to "expand" the genetic code and form novel proteins known as alloproteins incorporating non-proteinogenic amino acids. Non-proteinogenic amino acids Aside from the 22 proteinogenic amino acids, many non-proteinogenic amino acids are known. Those either are not found in proteins (for example carnitine, GABA, levothyroxine) or are not produced directly and in isolation by standard cellular machinery (for example, hydroxyproline and selenomethionine). Non-proteinogenic amino acids that are found in proteins are formed by post-translational modification, which is modification after translation during protein synthesis. These modifications are often essential for the function or regulation of a protein. For example, the carboxylation of glutamate allows for better binding of calcium cations, and collagen contains hydroxyproline, generated by hydroxylation of proline. Another example is the formation of hypusine in the translation initiation factor EIF5A, through modification of a lysine residue. Such modifications can also determine the localization of the protein, e.g., the addition of long hydrophobic groups can cause a protein to bind to a phospholipid membrane. Some non-proteinogenic amino acids are not found in proteins. Examples include 2-aminoisobutyric acid and the neurotransmitter gamma-aminobutyric acid. Non-proteinogenic amino acids often occur as intermediates in the metabolic pathways for standard amino acids – for example, ornithine and citrulline occur in the urea cycle, part of amino acid catabolism (see below). A rare exception to the dominance of α-amino acids in biology is the β-amino acid beta alanine (3-aminopropanoic acid), which is used in plants and microorganisms in the synthesis of pantothenic acid (vitamin B5), a component of coenzyme A. In human nutrition When taken up into the human body from the diet, the 20 standard amino acids either are used to synthesize proteins, other biomolecules, or are oxidized to urea and carbon dioxide as a source of energy. The oxidation pathway starts with the removal of the amino group by a transaminase; the amino group is then fed into the urea cycle. The other product of transamidation is a keto acid that enters the citric acid cycle. Glucogenic amino acids can also be converted into glucose, through gluconeogenesis. Of the 20 standard amino acids, nine (His, Ile, Leu, Lys, Met, Phe, Thr, Trp and Val) are called essential amino acids because the human body cannot synthesize them from other compounds at the level needed for normal growth, so they must be obtained from food. In addition, cysteine, tyrosine, and arginine are considered semiessential amino acids, and taurine a semiessential aminosulfonic acid in children. The metabolic pathways that synthesize these monomers are not fully developed. The amounts required also depend on the age and health of the individual, so it is hard to make general statements about the dietary requirement for some amino acids. Dietary exposure to the nonstandard amino acid BMAA has been linked to human neurodegenerative diseases, including ALS. Non-protein functions In humans, non-protein amino acids also have important roles as metabolic intermediates, such as in the biosynthesis of the neurotransmitter gamma-aminobutyric acid (GABA). Many amino acids are used to synthesize other molecules, for example: Tryptophan is a precursor of the neurotransmitter serotonin. Tyrosine (and its precursor phenylalanine) are precursors of the catecholamine neurotransmitters dopamine, epinephrine and norepinephrine and various trace amines. Phenylalanine is a precursor of phenethylamine and tyrosine in humans. In plants, it is a precursor of various phenylpropanoids, which are important in plant metabolism. Glycine is a precursor of porphyrins such as heme. Arginine is a precursor of nitric oxide. Ornithine and S-adenosylmethionine are precursors of polyamines. Aspartate, glycine, and glutamine are precursors of nucleotides. However, not all of the functions of other abundant nonstandard amino acids are known. Some nonstandard amino acids are used as defenses against herbivores in plants. For example, canavanine is an analogue of arginine that is found in many legumes, and in particularly large amounts in Canavalia gladiata (sword bean). This amino acid protects the plants from predators such as insects and can cause illness in people if some types of legumes are eaten without processing. The non-protein amino acid mimosine is found in other species of legume, in particular Leucaena leucocephala. This compound is an analogue of tyrosine and can poison animals that graze on these plants. Uses in industry Amino acids are used for a variety of applications in industry, but their main use is as additives to animal feed. This is necessary, since many of the bulk components of these feeds, such as soybeans, either have low levels or lack some of the essential amino acids: lysine, methionine, threonine, and tryptophan are most important in the production of these feeds. In this industry, amino acids are also used to chelate metal cations in order to improve the absorption of minerals from supplements, which may be required to improve the health or productivity of these animals. The food industry is also a major consumer of amino acids, in particular, glutamic acid, which is used as a flavor enhancer, and aspartame (aspartylphenylalanine 1-methyl ester) as a low-calorie artificial sweetener. Similar technology to that used for animal nutrition is employed in the human nutrition industry to alleviate symptoms of mineral deficiencies, such as anemia, by improving mineral absorption and reducing negative side effects from inorganic mineral supplementation. The chelating ability of amino acids has been used in fertilizers for agriculture to facilitate the delivery of minerals to plants in order to correct mineral deficiencies, such as iron chlorosis. These fertilizers are also used to prevent deficiencies from occurring and to improve the overall health of the plants. The remaining production of amino acids is used in the synthesis of drugs and cosmetics. Similarly, some amino acids derivatives are used in pharmaceutical industry. They include 5-HTP (5-hydroxytryptophan) used for experimental treatment of depression, L-DOPA (L-dihydroxyphenylalanine) for Parkinson's treatment, and eflornithine drug that inhibits ornithine decarboxylase and used in the treatment of sleeping sickness. Expanded genetic code Since 2001, 40 non-natural amino acids have been added into protein by creating a unique codon (recoding) and a corresponding transfer-RNA:aminoacyl – tRNA-synthetase pair to encode it with diverse physicochemical and biological properties in order to be used as a tool to exploring protein structure and function or to create novel or enhanced proteins. Nullomers Nullomers are codons that in theory code for an amino acid, however, in nature there is a selective bias against using this codon in favor of another, for example bacteria prefer to use CGA instead of AGA to code for arginine. This creates some sequences that do not appear in the genome. This characteristic can be taken advantage of and used to create new selective cancer-fighting drugs and to prevent cross-contamination of DNA samples from crime-scene investigations. Chemical building blocks Amino acids are important as low-cost feedstocks. These compounds are used in chiral pool synthesis as enantiomerically pure building blocks. Amino acids have been investigated as precursors chiral catalysts, such as for asymmetric hydrogenation reactions, although no commercial applications exist. Biodegradable plastics Amino acids have been considered as components of biodegradable polymers, which have applications as environmentally friendly packaging and in medicine in drug delivery and the construction of prosthetic implants. An interesting example of such materials is polyaspartate, a water-soluble biodegradable polymer that may have applications in disposable diapers and agriculture. Due to its solubility and ability to chelate metal ions, polyaspartate is also being used as a biodegradable antiscaling agent and a corrosion inhibitor. In addition, the aromatic amino acid tyrosine has been considered as a possible replacement for phenols such as bisphenol A in the manufacture of polycarbonates. Synthesis Chemical synthesis The commercial production of amino acids usually relies on mutant bacteria that overproduce individual amino acids using glucose as a carbon source. Some amino acids are produced by enzymatic conversions of synthetic intermediates. 2-Aminothiazoline-4-carboxylic acid is an intermediate in one industrial synthesis of L-cysteine for example. Aspartic acid is produced by the addition of ammonia to fumarate using a lyase. Biosynthesis In plants, nitrogen is first assimilated into organic compounds in the form of glutamate, formed from alpha-ketoglutarate and ammonia in the mitochondrion. For other amino acids, plants use transaminases to move the amino group from glutamate to another alpha-keto acid. For example, aspartate aminotransferase converts glutamate and oxaloacetate to alpha-ketoglutarate and aspartate. Other organisms use transaminases for amino acid synthesis, too. Nonstandard amino acids are usually formed through modifications to standard amino acids. For example, homocysteine is formed through the transsulfuration pathway or by the demethylation of methionine via the intermediate metabolite S-adenosylmethionine, while hydroxyproline is made by a post translational modification of proline. Microorganisms and plants synthesize many uncommon amino acids. For example, some microbes make 2-aminoisobutyric acid and lanthionine, which is a sulfide-bridged derivative of alanine. Both of these amino acids are found in peptidic lantibiotics such as alamethicin. However, in plants, 1-aminocyclopropane-1-carboxylic acid is a small disubstituted cyclic amino acid that is an intermediate in the production of the plant hormone ethylene. Reactions Amino acids undergo the reactions expected of the constituent functional groups. Peptide bond formation As both the amine and carboxylic acid groups of amino acids can react to form amide bonds, one amino acid molecule can react with another and become joined through an amide linkage. This polymerization of amino acids is what creates proteins. This condensation reaction yields the newly formed peptide bond and a molecule of water. In cells, this reaction does not occur directly; instead, the amino acid is first activated by attachment to a transfer RNA molecule through an ester bond. This aminoacyl-tRNA is produced in an ATP-dependent reaction carried out by an aminoacyl tRNA synthetase. This aminoacyl-tRNA is then a substrate for the ribosome, which catalyzes the attack of the amino group of the elongating protein chain on the ester bond. As a result of this mechanism, all proteins made by ribosomes are synthesized starting at their N-terminus and moving toward their C-terminus. However, not all peptide bonds are formed in this way. In a few cases, peptides are synthesized by specific enzymes. For example, the tripeptide glutathione is an essential part of the defenses of cells against oxidative stress. This peptide is synthesized in two steps from free amino acids. In the first step, gamma-glutamylcysteine synthetase condenses cysteine and glutamic acid through a peptide bond formed between the side chain carboxyl of the glutamate (the gamma carbon of this side chain) and the amino group of the cysteine. This dipeptide is then condensed with glycine by glutathione synthetase to form glutathione. In chemistry, peptides are synthesized by a variety of reactions. One of the most-used in solid-phase peptide synthesis uses the aromatic oxime derivatives of amino acids as activated units. These are added in sequence onto the growing peptide chain, which is attached to a solid resin support. Libraries of peptides are used in drug discovery through high-throughput screening. The combination of functional groups allow amino acids to be effective polydentate ligands for metal–amino acid chelates.

scene from the Walt Disney film Snow White and the Seven Dwarfs (1937), his favourite fairy tale. Both men noted that (in Leavitt's words) he took "an especially keen pleasure in the scene where the Wicked Queen immerses her apple in the poisonous brew". Turing's remains were cremated at Woking Crematorium on 12 June 1954, and his ashes were scattered in the gardens of the crematorium, just as his father's had been. Philosopher Jack Copeland has questioned various aspects of the coroner's historical verdict. He suggested an alternative explanation for the cause of Turing's death: the accidental inhalation of cyanide fumes from an apparatus used to electroplate gold onto spoons. The potassium cyanide was used to dissolve the gold. Turing had such an apparatus set up in his tiny spare room. Copeland noted that the autopsy findings were more consistent with inhalation than with ingestion of the poison. Turing also habitually ate an apple before going to bed, and it was not unusual for the apple to be discarded half-eaten. Furthermore, Turing had reportedly borne his legal setbacks and hormone treatment (which had been discontinued a year previously) "with good humour" and had shown no sign of despondency prior to his death. He even set down a list of tasks that he intended to complete upon returning to his office after the holiday weekend. Turing's mother believed that the ingestion was accidental, resulting from her son's careless storage of laboratory chemicals. Biographer Andrew Hodges theorised that Turing arranged the delivery of the equipment to deliberately allow his mother plausible deniability with regard to any suicide claims. It has been suggested that Turing's belief in fortune-telling may have caused his depressed mood. As a youth, Turing had been told by a fortune-teller that he would be a genius. In mid-May 1954, shortly before his death, Turing again decided to consult a fortune-teller during a day-trip to St Annes-on-Sea with the Greenbaum family. According to the Greenbaums' daughter, Barbara: But it was a lovely sunny day and Alan was in a cheerful mood and off we went... Then he thought it would be a good idea to go to the Pleasure Beach at Blackpool. We found a fortune-teller's tent[,] and Alan said he'd like to go in[,] so we waited around for him to come back... And this sunny, cheerful visage had shrunk into a pale, shaking, horror-stricken face. Something had happened. We don't know what the fortune-teller said[,] but he obviously was deeply unhappy. I think that was probably the last time we saw him before we heard of his suicide. Government apology and pardon In August 2009, British programmer John Graham-Cumming started a petition urging the British government to apologise for Turing's prosecution as a homosexual. The petition received more than 30,000 signatures. The Prime Minister, Gordon Brown, acknowledged the petition, releasing a statement on 10 September 2009 apologising and describing the treatment of Turing as "appalling": In December 2011, William Jones and his Member of Parliament, John Leech, created an e-petition requesting that the British government pardon Turing for his conviction of "gross indecency": The petition gathered over 37,000 signatures, and was submitted to Parliament by the Manchester MP John Leech but the request was discouraged by Justice Minister Lord McNally, who said: John Leech, the MP for Manchester Withington (2005–15), submitted several bills to Parliament and led a high-profile campaign to secure the pardon. Leech made the case in the House of Commons that Turing's contribution to the war made him a national hero and that it was "ultimately just embarrassing" that the conviction still stood. Leech continued to take the bill through Parliament and campaigned for several years, gaining the public support of numerous leading scientists, including Stephen Hawking. At the British premiere of a film based on Turing's life, The Imitation Game, the producers thanked Leech for bringing the topic to public attention and securing Turing's pardon. Leech is now regularly described as the "architect" of Turing's pardon and subsequently the Alan Turing Law which went on to secure pardons for 75,000 other men and women convicted of similar crimes. On 26 July 2012, a bill was introduced in the House of Lords to grant a statutory pardon to Turing for offences under section 11 of the Criminal Law Amendment Act 1885, of which he was convicted on 31 March 1952. Late in the year in a letter to The Daily Telegraph, the physicist Stephen Hawking and 10 other signatories including the Astronomer Royal Lord Rees, President of the Royal Society Sir Paul Nurse, Lady Trumpington (who worked for Turing during the war) and Lord Sharkey (the bill's sponsor) called on Prime Minister David Cameron to act on the pardon request. The government indicated it would support the bill, and it passed its third reading in the House of Lords in October. At the bill's second reading in the House of Commons on 29 November 2013, Conservative MP Christopher Chope objected to the bill, delaying its passage. The bill was due to return to the House of Commons on 28 February 2014, but before the bill could be debated in the House of Commons, the government elected to proceed under the royal prerogative of mercy. On 24 December 2013, Queen Elizabeth II signed a pardon for Turing's conviction for "gross indecency", with immediate effect. Announcing the pardon, Lord Chancellor Chris Grayling said Turing deserved to be "remembered and recognised for his fantastic contribution to the war effort" and not for his later criminal conviction. The Queen officially pronounced Turing pardoned in August 2014. The Queen's action is only the fourth royal pardon granted since the conclusion of the Second World War. Pardons are normally granted only when the person is technically innocent, and a request has been made by the family or other interested party; neither condition was met in regard to Turing's conviction. In September 2016, the government announced its intention to expand this retroactive exoneration to other men convicted of similar historical indecency offences, in what was described as an "Alan Turing law". The Alan Turing law is now an informal term for the law in the United Kingdom, contained in the Policing and Crime Act 2017, which serves as an amnesty law to retroactively pardon men who were cautioned or convicted under historical legislation that outlawed homosexual acts. The law applies in England and Wales. Legacy Awards, honours, and tributes Turing was appointed an officer of the Order of the British Empire in 1946. He was also elected a Fellow of the Royal Society (FRS) in 1951. Turing has been honoured in various ways in Manchester, the city where he worked towards the end of his life. In 1994, a stretch of the A6010 road (the Manchester city intermediate ring road) was named "Alan Turing Way". A bridge carrying this road was widened, and carries the name Alan Turing Bridge. A statue of Turing was unveiled in Manchester on 23 June 2001 in Sackville Park, between the University of Manchester building on Whitworth Street and Canal Street. The memorial statue depicts the "father of computer science" sitting on a bench at a central position in the park. Turing is shown holding an apple. The cast bronze bench carries in relief the text 'Alan Mathison Turing 1912–1954', and the motto 'Founder of Computer Science' as it could appear if encoded by an Enigma machine: 'IEKYF ROMSI ADXUO KVKZC GUBJ'. However, the meaning of the coded message is disputed, as the 'u' in 'computer' matches up with the 'u' in 'ADXUO'. As a letter encoded by an enigma machine cannot appear as itself, the actual message behind the code is uncertain. A plaque at the statue's feet reads 'Father of computer science, mathematician, logician, wartime codebreaker, victim of prejudice'. There is also a Bertrand Russell quotation: "Mathematics, rightly viewed, possesses not only truth, but supreme beauty—a beauty cold and austere, like that of sculpture." The sculptor buried his own old Amstrad computer under the plinth as a tribute to "the godfather of all modern computers". In 1999, Time magazine named Turing as one of the 100 Most Important People of the 20th century and stated, "The fact remains that everyone who taps at a keyboard, opening a spreadsheet or a word-processing program, is working on an incarnation of a Turing machine." A blue plaque was unveiled at King's College on the centenary of his birth on 23 June 2012 and is now installed at the college's Keynes Building on King's Parade. On 25 March 2021, the Bank of England publicly unveiled the design for a new £50 note, featuring Turing's portrait, before its official issue on 23 June, Turing's birthday. Turing was selected as the new face of the note in 2019 following a public nomination process. Centenary celebrations To mark the 100th anniversary of Turing's birth, the Turing Centenary Advisory Committee (TCAC) co-ordinated the Alan Turing Year in 2012, a year-long programme of events around the world honouring Turing's life and achievements. The TCAC, chaired by S. Barry Cooper with Turing's nephew Sir John Dermot Turing acting as Honorary President, worked with the University of Manchester faculty members and a broad spectrum of people from Cambridge University and Bletchley Park. Steel sculpture controversy In May 2020 it was reported by Gay Star News that a high steel sculpture, to honour Turing, designed by Sir Antony Gormley, was planned to be installed at King's College, Cambridge. Historic England, however, was quoted as saying that the abstract work of 19 steel slabs "... would be at odds with the existing character of the College. This would result in harm, of a less than substantial nature, to the significance of the listed buildings and landscape, and by extension the conservation area." References Sources Bruderer, Herbert: Konrad Zuse und die Schweiz. Wer hat den Computer erfunden? Charles Babbage, Alan Turing und John von Neumann Oldenbourg Verlag, München 2012, XXVI, 224 Seiten, in Petzold, Charles (2008). "The Annotated Turing: A Guided Tour through Alan Turing's Historic Paper on Computability and the Turing Machine". Indianapolis: Wiley Publishing. Smith, Roger (1997). Fontana History of the Human Sciences. London: Fontana. Weizenbaum, Joseph (1976). Computer Power and Human Reason. London: W.H. Freeman. and Turing's mother, who survived him by many years, wrote this 157-page biography of her son, glorifying his life. It was published in 1959, and so could not cover his war work. Scarcely 300 copies were sold (Sara Turing to Lyn Newman, 1967, Library of St John's College, Cambridge). The six-page foreword by Lyn Irvine includes reminiscences and is more frequently quoted. It was re-published by Cambridge University Press in 2012, to honour the centenary of his birth, and included a new foreword by Martin Davis, as well as a never-before-published memoir by Turing's older brother John F. Turing. This 1986 Hugh Whitemore play tells the story of Turing's life and death. In the original West End and Broadway runs, Derek Jacobi played Turing and he recreated the role in a 1997 television film based on the play made jointly by the BBC and WGBH, Boston. The play is published by Amber Lane Press, Oxford, ASIN: B000B7TM0Q Williams, Michael R. (1985) A History of Computing Technology, Englewood Cliffs, New Jersey: Prentice-Hall, Further reading Articles Books (originally published in 1983); basis of the film The Imitation Game (originally published in 1959 by W. Heffer & Sons, Ltd) External links Oral history interview with Nicholas C. Metropolis, Charles Babbage Institute, University of Minnesota. Metropolis was the first director of computing services at Los Alamos National Laboratory; topics include the relationship between Turing and John von Neumann How Alan Turing Cracked The Enigma Code Imperial War Museums Alan Turing RKBExplorer Alan Turing Year CiE 2012: Turing Centenary Conference Science in the Making Alan Turing's papers in the Royal Society's archives Alan Turing site maintained by Andrew Hodges including a short biography AlanTuring.net – Turing Archive for the History of Computing by Jack Copeland The Turing Archive – contains scans of some unpublished documents and material from the King's College, Cambridge archive Alan Turing Papers – University of Manchester Library, Manchester Sherborne School Archives – holds papers relating to Turing's time at Sherborne School Alan Turing plaques recorded on openplaques.org Alan Turing archive on New Scientist 1912 births 1954 deaths 1954 suicides 20th-century mathematicians 20th-century atheists 20th-century British scientists 20th-century English philosophers Academics of the University of Manchester Academics of the University of Manchester Institute of Science and Technology Alumni of King's College, Cambridge Artificial intelligence researchers Bayesian statisticians Bletchley Park people British anti-fascists British cryptographers British people of World War II Computability theorists Computer designers English atheists English computer scientists English inventors English logicians English male long-distance runners English mathematicians English

the 1926 General Strike, in Britain, but Turing was so determined to attend, that he rode his bicycle unaccompanied from Southampton to Sherborne, stopping overnight at an inn. Turing's natural inclination towards mathematics and science did not earn him respect from some of the teachers at Sherborne, whose definition of education placed more emphasis on the classics. His headmaster wrote to his parents: "I hope he will not fall between two stools. If he is to stay at public school, he must aim at becoming educated. If he is to be solely a Scientific Specialist, he is wasting his time at a public school". Despite this, Turing continued to show remarkable ability in the studies he loved, solving advanced problems in 1927 without having studied even elementary calculus. In 1928, aged 16, Turing encountered Albert Einstein's work; not only did he grasp it, but it is possible that he managed to deduce Einstein's questioning of Newton's laws of motion from a text in which this was never made explicit. Christopher Morcom At Sherborne, Turing formed a significant friendship with fellow pupil Christopher Collan Morcom (13 July 1911 – 13 February 1930), who has been described as Turing's "first love". Their relationship provided inspiration in Turing's future endeavours, but it was cut short by Morcom's death, in February 1930, from complications of bovine tuberculosis, contracted after drinking infected cow's milk some years previously. The event caused Turing great sorrow. He coped with his grief by working that much harder on the topics of science and mathematics that he had shared with Morcom. In a letter to Morcom's mother, Frances Isobel Morcom (née Swan), Turing wrote: Turing's relationship with Morcom's mother continued long after Morcom's death, with her sending gifts to Turing, and him sending letters, typically on Morcom's birthday. A day before the third anniversary of Morcom's death (13 February 1933), he wrote to Mrs. Morcom: Some have speculated that Morcom's death was the cause of Turing's atheism and materialism. Apparently, at this point in his life he still believed in such concepts as a spirit, independent of the body and surviving death. In a later letter, also written to Morcom's mother, Turing wrote: University and work on computability After Sherborne, Turing studied as an undergraduate from 1931 to 1934 at King's College, Cambridge, where he was awarded first-class honours in mathematics. In 1935, at the age of 22, he was elected a Fellow of King's College on the strength of a dissertation in which he proved the central limit theorem. Unknown to the committee, the theorem had already been proven, in 1922, by Jarl Waldemar Lindeberg. In 1936, Turing published his paper "On Computable Numbers, with an Application to the Entscheidungsproblem". It was published in the Proceedings of the London Mathematical Society journal in two parts, the first on 30 November and the second on 23 December. In this paper, Turing reformulated Kurt Gödel's 1931 results on the limits of proof and computation, replacing Gödel's universal arithmetic-based formal language with the formal and simple hypothetical devices that became known as Turing machines. The Entscheidungsproblem (decision problem) was originally posed by German mathematician David Hilbert in 1928. Turing proved that his "universal computing machine" would be capable of performing any conceivable mathematical computation if it were representable as an algorithm. He went on to prove that there was no solution to the decision problem by first showing that the halting problem for Turing machines is undecidable: it is not possible to decide algorithmically whether a Turing machine will ever halt. This paper has been called "easily the most influential math paper in history". Although Turing's proof was published shortly after Alonzo Church's equivalent proof using his lambda calculus, Turing's approach is considerably more accessible and intuitive than Church's. It also included a notion of a 'Universal Machine' (now known as a universal Turing machine), with the idea that such a machine could perform the tasks of any other computation machine (as indeed could Church's lambda calculus). According to the Church–Turing thesis, Turing machines and the lambda calculus are capable of computing anything that is computable. John von Neumann acknowledged that the central concept of the modern computer was due to Turing's paper. To this day, Turing machines are a central object of study in theory of computation. From September 1936 to July 1938, Turing spent most of his time studying under Church at Princeton University, in the second year as a Jane Eliza Procter Visiting Fellow. In addition to his purely mathematical work, he studied cryptology and also built three of four stages of an electro-mechanical binary multiplier. In June 1938, he obtained his PhD from the Department of Mathematics at Princeton; his dissertation, Systems of Logic Based on Ordinals, introduced the concept of ordinal logic and the notion of relative computing, in which Turing machines are augmented with so-called oracles, allowing the study of problems that cannot be solved by Turing machines. John von Neumann wanted to hire him as his postdoctoral assistant, but he went back to the United Kingdom. Career and research When Turing returned to Cambridge, he attended lectures given in 1939 by Ludwig Wittgenstein about the foundations of mathematics. The lectures have been reconstructed verbatim, including interjections from Turing and other students, from students' notes. Turing and Wittgenstein argued and disagreed, with Turing defending formalism and Wittgenstein propounding his view that mathematics does not discover any absolute truths, but rather invents them. Cryptanalysis During the Second World War, Turing was a leading participant in the breaking of German ciphers at Bletchley Park. The historian and wartime codebreaker Asa Briggs has said, "You needed exceptional talent, you needed genius at Bletchley and Turing's was that genius." From September 1938, Turing worked part-time with the Government Code and Cypher School (GC&CS), the British codebreaking organisation. He concentrated on cryptanalysis of the Enigma cipher machine used by Nazi Germany, together with Dilly Knox, a senior GC&CS codebreaker. Soon after the July 1939 meeting near Warsaw at which the Polish Cipher Bureau gave the British and French details of the wiring of Enigma machine's rotors and their method of decrypting Enigma machine's messages, Turing and Knox developed a broader solution. The Polish method relied on an insecure indicator procedure that the Germans were likely to change, which they in fact did in May 1940. Turing's approach was more general, using crib-based decryption for which he produced the functional specification of the bombe (an improvement on the Polish Bomba). On 4 September 1939, the day after the UK declared war on Germany, Turing reported to Bletchley Park, the wartime station of GC&CS. Like all others who came to Bletchley, he was required to sign the Official Secrets Act, in which he agreed not to disclose anything about his work at Bletchley, with severe legal penalties for violating the Act. Specifying the bombe was the first of five major cryptanalytical advances that Turing made during the war. The others were: deducing the indicator procedure used by the German navy; developing a statistical procedure dubbed Banburismus for making much more efficient use of the bombes; developing a procedure dubbed Turingery for working out the cam settings of the wheels of the Lorenz SZ 40/42 (Tunny) cipher machine and, towards the end of the war, the development of a portable secure voice scrambler at Hanslope Park that was codenamed Delilah. By using statistical techniques to optimise the trial of different possibilities in the code breaking process, Turing made an innovative contribution to the subject. He wrote two papers discussing mathematical approaches, titled The Applications of Probability to Cryptography and Paper on Statistics of Repetitions, which were of such value to GC&CS and its successor GCHQ that they were not released to the UK National Archives until April 2012, shortly before the centenary of his birth. A GCHQ mathematician, "who identified himself only as Richard," said at the time that the fact that the contents had been restricted under the Official Secrets Act for some 70 years demonstrated their importance, and their relevance to post-war cryptanalysis: Turing had a reputation for eccentricity at Bletchley Park. He was known to his colleagues as "Prof" and his treatise on Enigma was known as the "Prof's Book". According to historian Ronald Lewin, Jack Good, a cryptanalyst who worked with Turing, said of his colleague: Peter Hilton recounted his experience working with Turing in Hut 8 in his "Reminiscences of Bletchley Park" from A Century of Mathematics in America: Hilton echoed similar thoughts in the Nova PBS documentary Decoding Nazi Secrets. While working at Bletchley, Turing, who was a talented long-distance runner, occasionally ran the to London when he was needed for meetings, and he was capable of world-class marathon standards. Turing tried out for the 1948 British Olympic team, but he was hampered by an injury. His tryout time for the marathon was only 11 minutes slower than British silver medallist Thomas Richards' Olympic race time of 2 hours 35 minutes. He was Walton Athletic Club's best runner, a fact discovered when he passed the group while running alone. When asked why he ran so hard in training he replied: Due to the problems of counterfactual history, it is hard to estimate the precise effect Ultra intelligence had on the war. However, official war historian Harry Hinsley estimated that this work shortened the war in Europe by more than two years and saved over 14 million lives. At the end of the war, a memo was sent to all those who had worked at Bletchley Park, reminding them that the code of silence dictated by the Official Secrets Act did not end with the war but would continue indefinitely. Thus, even though Turing was appointed an Officer of the Order of the British Empire (OBE) in 1946 by King George VI for his wartime services, his work remained secret for many years. Bombe Within weeks of arriving at Bletchley Park, Turing had specified an electromechanical machine called the bombe, which could break Enigma more effectively than the Polish bomba kryptologiczna, from which its name was derived. The bombe, with an enhancement suggested by mathematician Gordon Welchman, became one of the primary tools, and the major automated one, used to attack Enigma-enciphered messages. The bombe searched for possible correct settings used for an Enigma message (i.e., rotor order, rotor settings and plugboard settings) using a suitable crib: a fragment of probable plaintext. For each possible setting of the rotors (which had on the order of 1019 states, or 1022 states for the four-rotor U-boat variant), the bombe performed a chain of logical deductions based on the crib, implemented electromechanically. The bombe detected when a contradiction had occurred and ruled out that setting, moving on to the next. Most of the possible settings would cause contradictions and be discarded, leaving only a few to be investigated in detail. A contradiction would occur when an enciphered letter would be turned back into the same plaintext letter, which was impossible with the Enigma. The first bombe was installed on 18 March 1940. By late 1941, Turing and his fellow cryptanalysts Gordon Welchman, Hugh Alexander and Stuart Milner-Barry were frustrated. Building on the work of the Poles, they had set up a good working system for decrypting Enigma signals, but their limited staff and bombes meant they could not translate all the signals. In the summer, they had considerable success, and shipping losses had fallen to under 100,000 tons a month; however, they badly needed more resources to keep abreast of German adjustments. They had tried to get more people and fund more bombes through the proper channels, but had failed. On 28 October they wrote directly to Winston Churchill explaining their difficulties, with Turing as the first named. They emphasised how small their need was compared with the vast expenditure of men and money by the forces and compared with the level of assistance they could offer to the forces. As Andrew Hodges, biographer of Turing, later wrote, "This letter had an electric effect." Churchill wrote a memo to General Ismay, which read: "ACTION THIS DAY. Make sure they have all they want on extreme priority and report to me that this has been done." On 18 November, the chief of the secret service reported that every possible measure was being taken. The cryptographers at Bletchley Park did not know of the Prime Minister's response, but as Milner-Barry recalled, "All that we did notice was that almost from that day the rough ways began miraculously to be made smooth." More than two hundred bombes were in operation by the end of the war. Hut 8 and the naval Enigma Turing decided to tackle the particularly difficult problem of German naval Enigma "because no one else was doing anything about it and I could have it to myself". In December 1939, Turing solved the essential part of the naval indicator system, which was more complex than the indicator systems used by the other services. That same night, he also conceived of the idea of Banburismus, a sequential statistical technique (what Abraham Wald later called sequential analysis) to assist in breaking the naval Enigma, "though I was not sure that it would work in practice, and was not, in fact, sure until some days had actually broken." For this, he invented a measure of weight of evidence that he called the ban. Banburismus could rule out certain sequences of the Enigma rotors, substantially reducing the time needed to test settings on the bombes. Later this sequential process of accumulating sufficient weight of evidence using decibans (one tenth of a ban) was used in Cryptanalysis of the Lorenz cipher. Turing travelled to the United States in November 1942 and worked with US Navy cryptanalysts on the naval Enigma and bombe construction in Washington; he also visited their Computing Machine Laboratory in Dayton, Ohio. Turing's reaction to the American bombe design was far from enthusiastic: During this trip, he also assisted at Bell Labs with the development of secure speech devices. He returned to Bletchley Park in March 1943. During his absence, Hugh Alexander had officially assumed the position of head of Hut 8, although Alexander had been de facto head for some time (Turing having little interest in the day-to-day running of the section). Turing became a general consultant for cryptanalysis at Bletchley Park. Alexander wrote of Turing's contribution: Turingery In July 1942, Turing devised a technique termed Turingery (or jokingly Turingismus) for use against the Lorenz cipher messages produced by the Germans' new Geheimschreiber (secret writer) machine. This was a teleprinter rotor cipher attachment codenamed Tunny at Bletchley Park. Turingery was a method of wheel-breaking, i.e., a procedure for working out the cam settings of Tunny's wheels. He also introduced the Tunny team to Tommy Flowers who, under the guidance of Max Newman, went on to build the Colossus computer, the world's first programmable digital electronic computer, which replaced a simpler prior machine (the Heath Robinson), and whose superior speed allowed the statistical decryption techniques to be applied usefully to the messages. Some have mistakenly said that Turing was a key figure in the design of the Colossus computer. Turingery and the statistical approach of Banburismus undoubtedly fed into the thinking about cryptanalysis of the Lorenz cipher, but he was not directly involved in the Colossus development. Delilah Following his work at Bell Labs in the US, Turing pursued the idea of electronic enciphering of speech in the telephone system. In the latter part of the war, he moved to work for the Secret Service's Radio Security Service (later HMGCC) at Hanslope Park. At the park, he further developed his knowledge of electronics with the assistance of engineer Donald Bayley. Together they undertook the design and construction of a portable secure voice communications machine codenamed Delilah. The machine was intended for different applications, but it lacked the capability for use with long-distance radio transmissions. In any case, Delilah was completed too late to be used during the war. Though the system worked fully, with Turing demonstrating it to officials by encrypting and decrypting a recording of a Winston Churchill speech, Delilah was not adopted for use. Turing also consulted with Bell Labs on the development of SIGSALY, a secure voice system that was used in the later years of the war. Early computers and the

is in M and S is congruent to T then T is also in M and a(S) = a(T). Every rectangle R is in M. If the rectangle has length h and breadth k then a(R) = hk. Let Q be a set enclosed between two step regions S and T. A step region is formed from a finite union of adjacent rectangles resting on a common base, i.e. S ⊆ Q ⊆ T. If there is a unique number c such that a(S) ≤ c ≤ a(T) for all such step regions S and T, then a(Q) = c. It can be proved that such an area function actually exists. Units Every unit of length has a corresponding unit of area, namely the area of a square with the given side length. Thus areas can be measured in square metres (m2), square centimetres (cm2), square millimetres (mm2), square kilometres (km2), square feet (ft2), square yards (yd2), square miles (mi2), and so forth. Algebraically, these units can be thought of as the squares of the corresponding length units. The SI unit of area is the square metre, which is considered an SI derived unit. Conversions Calculation of the area of a square whose length and width are 1 metre would be: 1 metre × 1 metre = 1 m2 and so, a rectangle with different sides (say length of 3 metres and width of 2 metres) would have an area in square units that can be calculated as: 3 metres × 2 metres = 6 m2. This is equivalent to 6 million square millimetres. Other useful conversions are: 1 square kilometre = 1,000,000 square metres 1 square metre = 10,000 square centimetres = 1,000,000 square millimetres 1 square centimetre = 100 square millimetres. Non-metric units In non-metric units, the conversion between two square units is the square of the conversion between the corresponding length units. 1 foot = 12 inches, the relationship between square feet and square inches is 1 square foot = 144 square inches, where 144 = 122 = 12 × 12. Similarly: 1 square yard = 9 square feet 1 square mile = 3,097,600 square yards = 27,878,400 square feet In addition, conversion factors include: 1 square inch = 6.4516 square centimetres 1 square foot = square metres 1 square yard = square metres 1 square mile = square kilometres Other units including historical There are several other common units for area. The are was the original unit of area in the metric system, with: 1 are = 100 square metres Though the are has fallen out of use, the hectare is still commonly used to measure land: 1 hectare = 100 ares = 10,000 square metres = 0.01 square kilometres Other uncommon metric units of area include the tetrad, the hectad, and the myriad. The acre is also commonly used to measure land areas, where 1 acre = 4,840 square yards = 43,560 square feet. An acre is approximately 40% of a hectare. On the atomic scale, area is measured in units of barns, such that: 1 barn = 10−28 square meters. The barn is commonly used in describing the cross-sectional area of interaction in nuclear physics. In India, 20 dhurki = 1 dhur 20 dhur = 1 khatha 20 khata = 1 bigha 32 khata = 1 acre History Circle area In the 5th century BCE, Hippocrates of Chios was the first to show that the area of a disk (the region enclosed by a circle) is proportional to the square of its diameter, as part of his quadrature of the lune of Hippocrates, but did not identify the constant of proportionality. Eudoxus of Cnidus, also in the 5th century BCE, also found that the area of a disk is proportional to its radius squared. Subsequently, Book I of Euclid's Elements dealt with equality of areas between two-dimensional figures. The mathematician Archimedes used the tools of Euclidean geometry to show that the area inside a circle is equal to that of a right triangle whose base has the length of the circle's circumference and whose height equals the circle's radius, in his book Measurement of a Circle. (The circumference is 2r, and the area of a triangle is half the base times the height, yielding the area r2 for the disk.) Archimedes approximated the value of π (and hence the area of a unit-radius circle) with his doubling method, in which he inscribed a regular triangle in a circle and noted its area, then doubled the number of sides to give a regular hexagon, then repeatedly doubled the number of sides as the polygon's area got closer and closer to that of the circle (and did the same with circumscribed polygons). Swiss scientist Johann Heinrich Lambert in 1761 proved that π, the ratio of a circle's area to its squared radius, is irrational, meaning it is not equal to the quotient of any two whole numbers. In 1794, French mathematician Adrien-Marie Legendre proved that π2 is irrational; this also proves that π is irrational. In 1882, German mathematician Ferdinand von Lindemann proved that π is transcendental (not the solution of any polynomial equation with rational coefficients), confirming a conjecture made by both Legendre and Euler. Triangle area Heron (or Hero) of Alexandria found what is known as Heron's formula for the area of a triangle in terms of its sides, and a proof can be found in his book, Metrica, written around 60 CE. It has been suggested that Archimedes knew the formula over two centuries earlier, and since Metrica is a collection of the mathematical knowledge available in the ancient world, it is possible that the formula predates the reference given in that work. In 499 Aryabhata, a great mathematician-astronomer from the classical age of Indian mathematics and Indian astronomy, expressed the area of a triangle as one-half the base times the height in the Aryabhatiya (section 2.6). A formula equivalent to Heron's was discovered by the Chinese independently of the Greeks. It was published in 1247 in Shushu Jiuzhang ("Mathematical Treatise in Nine Sections"), written by Qin Jiushao. Quadrilateral area In the 7th century CE, Brahmagupta developed a formula, now known as Brahmagupta's formula, for the area of a cyclic quadrilateral (a quadrilateral inscribed in a circle) in terms of its sides. In 1842, the German mathematicians Carl Anton Bretschneider and Karl Georg Christian von Staudt independently found a formula, known as Bretschneider's formula, for the area of any quadrilateral. General polygon area The development of Cartesian coordinates by René Descartes in the 17th century allowed the development of the surveyor's formula for the area of any polygon with known vertex locations by Gauss in the 19th century. Areas determined using calculus The development of integral calculus in the late 17th century provided tools that could subsequently be used for computing more complicated areas, such as the area of an ellipse and the surface areas of various curved three-dimensional objects. Area formulas Polygon formulas For a non-self-intersecting (simple) polygon, the Cartesian coordinates (i=0, 1, ..., n-1) of whose n vertices are known, the area is given by the surveyor's formula: where when i=n-1, then i+1 is expressed as modulus n and so refers to 0. Rectangles The most basic area formula is the formula for the area of a rectangle. Given a rectangle with length and width , the formula for the area is: (rectangle). That is, the area of the rectangle

three such squares. In mathematics, the unit square is defined to have area one, and the area of any other shape or surface is a dimensionless real number. There are several well-known formulas for the areas of simple shapes such as triangles, rectangles, and circles. Using these formulas, the area of any polygon can be found by dividing the polygon into triangles. For shapes with curved boundary, calculus is usually required to compute the area. Indeed, the problem of determining the area of plane figures was a major motivation for the historical development of calculus. For a solid shape such as a sphere, cone, or cylinder, the area of its boundary surface is called the surface area. Formulas for the surface areas of simple shapes were computed by the ancient Greeks, but computing the surface area of a more complicated shape usually requires multivariable calculus. Area plays an important role in modern mathematics. In addition to its obvious importance in geometry and calculus, area is related to the definition of determinants in linear algebra, and is a basic property of surfaces in differential geometry. In analysis, the area of a subset of the plane is defined using Lebesgue measure, though not every subset is measurable. In general, area in higher mathematics is seen as a special case of volume for two-dimensional regions. Area can be defined through the use of axioms, defining it as a function of a collection of certain plane figures to the set of real numbers. It can be proved that such a function exists. Formal definition An approach to defining what is meant by "area" is through axioms. "Area" can be defined as a function from a collection M of a special kinds of plane figures (termed measurable sets) to the set of real numbers, which satisfies the following properties: For all S in M, a(S) ≥ 0. If S and T are in M then so are S ∪ T and S ∩ T, and also a(S∪T) = a(S) + a(T) − a(S∩T). If S and T are in M with S ⊆ T then T − S is in M and a(T−S) = a(T) − a(S). If a set S is in M and S is congruent to T then T is also in M and a(S) = a(T). Every rectangle R is in M. If the rectangle has length h and breadth k then a(R) = hk. Let Q be a set enclosed between two step regions S and T. A step region is formed from a finite union of adjacent rectangles resting on a common base, i.e. S ⊆ Q ⊆ T. If there is a unique number c such that a(S) ≤ c ≤ a(T) for all such step regions S and T, then a(Q) = c. It can be proved that such an area function actually exists. Units Every unit of length has a corresponding unit of area, namely the area of a square with the given side length. Thus areas can be measured in square metres (m2), square centimetres (cm2), square millimetres (mm2), square kilometres (km2), square feet (ft2), square yards (yd2), square miles (mi2), and so forth. Algebraically, these units can be thought of as the squares of the corresponding length units. The SI unit of area is the square metre, which is considered an SI derived unit. Conversions Calculation of the area of a square whose length and width are 1 metre would be: 1 metre × 1 metre = 1 m2 and so, a rectangle with different sides (say length of 3 metres and width of 2 metres) would have an area in square units that can be calculated as: 3 metres × 2 metres = 6 m2. This is equivalent to 6 million square millimetres. Other useful conversions are: 1 square kilometre = 1,000,000 square metres 1 square metre = 10,000 square centimetres = 1,000,000 square millimetres 1 square centimetre = 100 square millimetres. Non-metric units In non-metric units, the conversion between two square units is the square of the conversion between the corresponding length units. 1 foot = 12 inches, the relationship between square feet and square inches is 1 square foot = 144 square inches, where 144 = 122 = 12 × 12. Similarly: 1 square yard = 9 square feet 1 square mile = 3,097,600 square yards = 27,878,400 square feet In addition, conversion factors include: 1 square inch = 6.4516 square centimetres 1 square foot = square metres 1 square yard = square metres 1 square mile = square kilometres Other units including historical There are several other common units for area. The are was the original unit of area in the metric system, with: 1 are = 100 square metres Though the are has fallen out of use, the hectare is still commonly used to measure land: 1 hectare = 100 ares = 10,000 square metres = 0.01 square kilometres Other uncommon metric units of area include the tetrad, the hectad, and the myriad. The acre is also commonly used to measure land areas, where 1 acre = 4,840 square yards = 43,560 square feet. An acre is approximately 40% of a hectare. On the atomic scale, area is measured in units of barns, such that: 1 barn = 10−28 square meters. The barn is commonly used in describing the cross-sectional area of interaction in nuclear physics. In India, 20 dhurki = 1 dhur 20 dhur = 1 khatha 20 khata = 1 bigha 32 khata = 1 acre History Circle area In the 5th century BCE, Hippocrates of Chios was the first to show that the area of a disk (the region enclosed by a circle) is proportional to the square of its diameter, as part of his quadrature of the lune of Hippocrates, but did not identify the constant of proportionality. Eudoxus of Cnidus, also in the 5th century BCE, also found that the area of a disk is proportional to its radius squared. Subsequently, Book I of Euclid's Elements dealt with equality of areas between two-dimensional figures. The mathematician Archimedes used the tools of Euclidean geometry to show that the area inside a circle is equal to that of a right triangle whose base has the length of the circle's circumference and whose height equals the circle's radius, in his book Measurement of a Circle. (The circumference is 2r, and the area of a triangle is half the base times the height, yielding the area r2 for the disk.) Archimedes approximated the value of π (and hence the area of a unit-radius circle) with his doubling method, in which he inscribed a regular triangle in a circle and noted its area, then doubled the number of sides to give a regular hexagon, then repeatedly doubled the number of sides as the polygon's area got closer and closer to that of the circle (and did the same with circumscribed polygons). Swiss scientist Johann Heinrich Lambert in 1761 proved that π, the ratio of a circle's area to its squared radius, is irrational, meaning it is not equal to the quotient of any two whole numbers. In 1794, French mathematician Adrien-Marie Legendre proved that π2 is irrational; this also proves that π is irrational. In 1882, German mathematician Ferdinand von Lindemann proved that π is transcendental (not the solution of any polynomial equation with rational coefficients), confirming a conjecture made by both Legendre and Euler. Triangle area Heron (or Hero) of Alexandria found what is known as Heron's formula for the area of a triangle in terms of its sides, and a proof can be found in his book, Metrica, written around 60 CE. It has been suggested that Archimedes knew the formula over two centuries earlier, and since Metrica is a collection of the mathematical knowledge available in the ancient world, it is possible that the formula predates the reference given in that work. In 499 Aryabhata, a great mathematician-astronomer from the classical age of Indian mathematics and Indian astronomy, expressed the area of a triangle as one-half the base times the height in the Aryabhatiya (section 2.6). A formula

precision the calculations require adjustment for things such as the motions of the probe and object while the photons are transiting. In addition, the measurement of the time itself must be translated to a standard scale that accounts for relativistic time dilation. Comparison of the ephemeris positions with time measurements expressed in Barycentric Dynamical Time (TDB) leads to a value for the speed of light in astronomical units per day (of ). By 2009, the IAU had updated its standard measures to reflect improvements, and calculated the speed of light at (TDB). In 1983, the CIPM modified the International System of Units (SI) to make the metre defined as the distance travelled in a vacuum by light in 1 / second. This replaced the previous definition, valid between 1960 and 1983, which was that the metre equalled a certain number of wavelengths of a certain emission line of krypton-86. (The reason for the change was an improved method of measuring the speed of light.) The speed of light could then be expressed exactly as c0 = , a standard also adopted by the IERS numerical standards. From this definition and the 2009 IAU standard, the time for light to traverse an astronomical unit is found to be τA = , which is slightly more than 8 minutes 19 seconds. By multiplication, the best IAU 2009 estimate was A = c0τA = , based on a comparison of Jet Propulsion Laboratory and IAA–RAS ephemerides. In 2006, the BIPM reported a value of the astronomical unit as . In the 2014 revision of the SI Brochure, the BIPM recognised the IAU's 2012 redefinition of the astronomical unit as . This estimate was still derived from observation and measurements subject to error, and based on techniques that did not yet standardize all relativistic effects, and thus were not constant for all observers. In 2012, finding that the equalization of relativity alone would make the definition overly complex, the IAU simply used the 2009 estimate to redefine the astronomical unit as a conventional unit of length directly tied to the metre (exactly ). The new definition also recognizes as a consequence that the astronomical unit is now to play a role of reduced importance, limited in its use to that of a convenience in some applications. {| |- |rowspan=7 valign=top|1 astronomical unit |= metres (by definition) |- |= (exactly) |- |≈ |- |≈ light-seconds |- |≈ light-minutes |- |≈ |- |≈ |} This definition makes the speed of light, defined as exactly , equal to exactly × ÷ or about au/d, some 60 parts per trillion less than the 2009 estimate. Usage and significance With the definitions used before 2012, the astronomical unit was dependent on the heliocentric gravitational constant, that is the product of the gravitational constant, G, and the solar mass, . Neither G nor can be measured to high accuracy separately, but the value of their product is known very precisely from observing the relative positions of planets (Kepler's Third Law expressed in terms of Newtonian gravitation). Only the product is required to calculate planetary positions for an ephemeris, so ephemerides are calculated in astronomical units and not in SI units. The calculation of ephemerides also requires a consideration of the effects of general relativity. In particular, time intervals measured on Earth's surface (Terrestrial Time, TT) are not constant when compared with the motions of the planets: the terrestrial second (TT) appears to be longer near January and shorter near July when compared with the "planetary second" (conventionally measured in TDB). This is because the distance between Earth and the Sun is not fixed (it varies between and ) and, when Earth is closer to the Sun (perihelion), the Sun's gravitational field is stronger and Earth is moving faster along its orbital path. As the metre is defined in terms of the second and the speed of light is constant for all observers, the terrestrial metre appears to change in length compared with the "planetary metre" on a periodic basis. The metre is defined to be a unit of proper length, but the SI definition does not specify the metric tensor to be used in determining it. Indeed, the International Committee for Weights and Measures (CIPM) notes that "its definition applies only within a spatial extent sufficiently small that the effects of the non-uniformity of the gravitational field can be ignored". As such, the metre is undefined for the purposes of measuring distances within the Solar System. The 1976 definition of the astronomical unit was incomplete because it did not specify the frame of reference in which time is to be measured, but proved practical for the calculation of ephemerides: a fuller definition that is consistent with general relativity was proposed, and "vigorous debate" ensued until August 2012 when the IAU adopted the current definition of 1 astronomical unit = metres. The astronomical unit is typically used for stellar system scale distances, such as the size of a protostellar disk or the heliocentric distance of an asteroid, whereas other units are used for other distances in astronomy. The astronomical unit is too small to be convenient for interstellar distances, where the parsec and light-year are widely used. The parsec (parallax arcsecond) is defined in terms of the astronomical unit, being the distance of an object with a parallax of . The light-year is often used in popular works, but is not an approved non-SI unit and is rarely used by professional astronomers. When simulating a numerical model of the Solar System, the astronomical unit provides an appropriate scale that minimizes (overflow, underflow and truncation) errors in floating point calculations. History The book On the Sizes and Distances of the Sun and Moon, which is ascribed to Aristarchus, says the distance to the Sun is 18 to 20 times the distance to the Moon, whereas the true ratio is about . The latter estimate was based on the angle between the half-moon and the Sun, which he estimated as (the true value being close to ). Depending on the distance that van Helden assumes Aristarchus used for the distance to the Moon, his calculated distance to the Sun would fall between and Earth radii. According to Eusebius of Caesarea in the Praeparatio Evangelica (Book XV, Chapter 53), Eratosthenes found the distance to the Sun to be "σταδιων μυριαδας τετρακοσιας και οκτωκισμυριας" (literally "of stadia myriads 400 and ) but with the additional note that in the Greek text the grammatical agreement is between myriads (not stadia) on the one hand and both 400 and on the other, as in Greek, unlike English, all three (or all four if one were to include stadia) words are inflected. This has been translated either as stadia (1903 translation by Edwin Hamilton Gifford), or as stadia (edition of , dated 1974–1991). Using the Greek stadium of 185 to 190 metres, the former translation comes to to , which is far too low, whereas the second translation comes to 148.7 to 152.8 million kilometres (accurate within 2%). Hipparchus also gave an estimate of the distance of Earth from the Sun, quoted by Pappus as equal to 490 Earth radii. According to the conjectural reconstructions of Noel Swerdlow and G. J. Toomer, this was derived from his assumption of a "least perceptible" solar parallax of . A Chinese mathematical treatise, the Zhoubi Suanjing (c. 1st century BCE), shows how the distance to the Sun can be computed geometrically, using the different lengths of the noontime shadows observed at three places li apart and the assumption that Earth is flat. In the 2nd century CE, Ptolemy estimated the mean distance of the Sun as times Earth's radius. To determine this value, Ptolemy started by measuring the Moon's parallax, finding what amounted to a horizontal lunar parallax of 1° 26′, which was much too large. He then derived a maximum lunar distance of Earth radii. Because of cancelling errors in his parallax figure, his theory of the Moon's orbit, and other factors, this figure was approximately correct. He then measured the apparent sizes of the Sun and the Moon and concluded that the apparent diameter of the Sun was equal to the apparent diameter of the Moon at the Moon's greatest distance, and from records of lunar eclipses, he estimated this apparent diameter, as well as the apparent diameter of the shadow cone of Earth traversed by the Moon during a lunar eclipse. Given these data, the distance of the Sun from Earth can be trigonometrically computed to be Earth radii. This gives a ratio of solar to lunar distance of approximately 19, matching Aristarchus's figure.

appears to be longer near January and shorter near July when compared with the "planetary second" (conventionally measured in TDB). This is because the distance between Earth and the Sun is not fixed (it varies between and ) and, when Earth is closer to the Sun (perihelion), the Sun's gravitational field is stronger and Earth is moving faster along its orbital path. As the metre is defined in terms of the second and the speed of light is constant for all observers, the terrestrial metre appears to change in length compared with the "planetary metre" on a periodic basis. The metre is defined to be a unit of proper length, but the SI definition does not specify the metric tensor to be used in determining it. Indeed, the International Committee for Weights and Measures (CIPM) notes that "its definition applies only within a spatial extent sufficiently small that the effects of the non-uniformity of the gravitational field can be ignored". As such, the metre is undefined for the purposes of measuring distances within the Solar System. The 1976 definition of the astronomical unit was incomplete because it did not specify the frame of reference in which time is to be measured, but proved practical for the calculation of ephemerides: a fuller definition that is consistent with general relativity was proposed, and "vigorous debate" ensued until August 2012 when the IAU adopted the current definition of 1 astronomical unit = metres. The astronomical unit is typically used for stellar system scale distances, such as the size of a protostellar disk or the heliocentric distance of an asteroid, whereas other units are used for other distances in astronomy. The astronomical unit is too small to be convenient for interstellar distances, where the parsec and light-year are widely used. The parsec (parallax arcsecond) is defined in terms of the astronomical unit, being the distance of an object with a parallax of . The light-year is often used in popular works, but is not an approved non-SI unit and is rarely used by professional astronomers. When simulating a numerical model of the Solar System, the astronomical unit provides an appropriate scale that minimizes (overflow, underflow and truncation) errors in floating point calculations. History The book On the Sizes and Distances of the Sun and Moon, which is ascribed to Aristarchus, says the distance to the Sun is 18 to 20 times the distance to the Moon, whereas the true ratio is about . The latter estimate was based on the angle between the half-moon and the Sun, which he estimated as (the true value being close to ). Depending on the distance that van Helden assumes Aristarchus used for the distance to the Moon, his calculated distance to the Sun would fall between and Earth radii. According to Eusebius of Caesarea in the Praeparatio Evangelica (Book XV, Chapter 53), Eratosthenes found the distance to the Sun to be "σταδιων μυριαδας τετρακοσιας και οκτωκισμυριας" (literally "of stadia myriads 400 and ) but with the additional note that in the Greek text the grammatical agreement is between myriads (not stadia) on the one hand and both 400 and on the other, as in Greek, unlike English, all three (or all four if one were to include stadia) words are inflected. This has been translated either as stadia (1903 translation by Edwin Hamilton Gifford), or as stadia (edition of , dated 1974–1991). Using the Greek stadium of 185 to 190 metres, the former translation comes to to , which is far too low, whereas the second translation comes to 148.7 to 152.8 million kilometres (accurate within 2%). Hipparchus also gave an estimate of the distance of Earth from the Sun, quoted by Pappus as equal to 490 Earth radii. According to the conjectural reconstructions of Noel Swerdlow and G. J. Toomer, this was derived from his assumption of a "least perceptible" solar parallax of . A Chinese mathematical treatise, the Zhoubi Suanjing (c. 1st century BCE), shows how the distance to the Sun can be computed geometrically, using the different lengths of the noontime shadows observed at three places li apart and the assumption that Earth is flat. In the 2nd century CE, Ptolemy estimated the mean distance of the Sun as times Earth's radius. To determine this value, Ptolemy started by measuring the Moon's parallax, finding what amounted to a horizontal lunar parallax of 1° 26′, which was much too large. He then derived a maximum lunar distance of Earth radii. Because of cancelling errors in his parallax figure, his theory of the Moon's orbit, and other factors, this figure was approximately correct. He then measured the apparent sizes of the Sun and the Moon and concluded that the apparent diameter of the Sun was equal to the apparent diameter of the Moon at the Moon's greatest distance, and from records of lunar eclipses, he estimated this apparent diameter, as well as the apparent diameter of the shadow cone of Earth traversed by the Moon during a lunar eclipse. Given these data, the distance of the Sun from Earth can be trigonometrically computed to be Earth radii. This gives a ratio of solar to lunar distance of approximately 19, matching Aristarchus's figure. Although Ptolemy's procedure is theoretically workable, it is very sensitive to small changes in the data, so much so that changing a measurement by a few per cent can make the solar distance infinite. After Greek astronomy was transmitted to the medieval Islamic world, astronomers made some changes to Ptolemy's cosmological model, but did not greatly change his estimate of the Earth–Sun distance. For example, in his introduction to Ptolemaic astronomy, al-Farghānī gave a mean solar distance of Earth radii, whereas in his zij, al-Battānī used a mean solar distance of Earth radii. Subsequent astronomers, such as al-Bīrūnī, used similar values. Later in Europe, Copernicus and Tycho Brahe also used comparable figures ( and Earth radii), and so Ptolemy's approximate Earth–Sun distance survived through the 16th century. Johannes Kepler was the first to realize that Ptolemy's estimate must be significantly too low (according to Kepler, at least by a factor of three) in his Rudolphine Tables (1627). Kepler's laws of planetary motion allowed astronomers to calculate the relative distances of the planets from the Sun, and rekindled interest in measuring the absolute value for Earth (which could then be applied to the other planets). The invention of the telescope allowed far more accurate measurements of angles than is possible with the naked eye. Flemish astronomer Godefroy Wendelin repeated Aristarchus’ measurements

work regarded as mere manual labour. The word art derives from the Latin "ars" (stem art-), which, although literally defined means "skill method" or "technique", also conveys a connotation of beauty. During the Middle Ages the word artist already existed in some countries such as Italy, but the meaning was something resembling craftsman, while the word artesan was still unknown. An artist was someone able to do a work better than others, so the skilled excellency was underlined, rather than the activity field. In this period some "artisanal" products (such as textiles) were much more precious and expensive than paintings or sculptures. The first division into major and minor arts dates back at least to the works of Leon Battista Alberti (1404–1472): De re aedificatoria, De statua, De pictura, which focused on the importance of the intellectual skills of the artist rather than the manual skills (even if in other forms of art there was a project behind). With the Academies in Europe (second half of 16th century) the gap between fine and applied arts was definitely set. Many contemporary definitions of "artist" and "art" are highly contingent on culture, resisting aesthetic prescription, in much the same way that the features constituting beauty and the beautiful cannot be standardized easily without moving into kitsch. Training and employment The US Bureau of Labor Statistics classifies many visual artists as either craft artists or fine artists. A craft artist makes handmade functional works of art, such as pottery or clothing. A fine artist makes paintings, illustrations (such as book illustrations or medical illustrations), sculptures, or similar artistic works primarily for their aesthetic value. The main source of skill for both craft artists and fine artists is long-term repetition and practice. Many fine artists have studied their art form at university and some have a master's degree in fine arts. Artists may also study on their own or receive on-the-job training from an experienced artist. The number of available jobs as an artist is increasing more slowly than other fields. About half of US artists are self-employed. Others work in a variety of industries. For example, a pottery manufacturer will employ craft artists, and book publishers will hire illustrators. In the US, fine artists have a median income of approximately US$50,000 per year, and craft artists have a median income of approximately US$33,000 per year. This compares to US$61,000 for all art-related fields, including related jobs such as graphic designers, multimedia artists, animators, and fashion designers. Many artists work part-time as artists and hold a second job. See

and mostly restricted to contexts like used in criticism. Dictionary definitions The Oxford English Dictionary defines the older broad meanings of the term "artist": A learned person or Master of Arts. One who pursues a practical science, traditionally medicine, astrology, alchemy, chemistry. A follower of a pursuit in which skill comes by study or practice. A follower of a manual art, such as a mechanic. One who makes their craft a fine art. One who cultivates one of the fine arts – traditionally the arts presided over by the muses. History of the term The Greek word "techně", often translated as "art," implies mastery of any sort of craft. The adjectival Latin form of the word, "technicus", became the source of the English words technique, technology, technical. In Greek culture each of the nine Muses oversaw a different field of human creation: Calliope (the 'beautiful of speech'): chief of the muses and muse of epic or heroic poetry Clio (the 'glorious one'): muse of history Erato (the 'amorous one'): muse of love or erotic poetry, lyrics, and marriage songs Euterpe (the 'well-pleasing'): muse of music and lyric poetry Melpomene (the 'chanting one'): muse of tragedy Polyhymnia or Polymnia (the '[singer] of many hymns'): muse of sacred song, oratory, lyric, singing, and rhetoric Terpsichore (the '[one who] delights

Names of dogs Notes: Names of dogs were verified to correspond to the list given in Ovid's text where the names were already transliterated. ? = Seven listed names of dogs in Hyginus' Fabulae, was probably misread or misinterpreted by later authors because it does not correspond to the exact numbers and names given by Ovid: Arcas signifies Arcadia, place of origin of three dogs namely Pamphagos, Dorceus and Oribasus Cyprius means Cyprus, where the dogs Lysisca and Harpalos originated Gnosius can be read as Knossus in Crete, which signify that Ichnobates was a Knossian breed of dog Echnobas, Elion, Aura and Therodanapis were probably place names or adjectives defining the characteristics of dogs The "bed of Actaeon" In the second century AD, the traveller Pausanias was shown a spring on the road in Attica leading to Plataea from Eleutherae, just beyond Megara "and a little farther on a rock. It is called the bed of Actaeon, for it is said that he slept thereon when weary with hunting and that into this spring he looked while Artemis was bathing in it." Parallels in Akkadian and Ugarit poems In the standard version of the Epic of Gilgamesh (tablet vi) there is a parallel, in the series of examples Gilgamesh gives Ishtar of her mistreatment of her serial lovers: You loved the herdsman, shepherd and chief shepherd Who was always heaping up the glowing ashes for you, And cooked ewe-lambs for you every day. But you hit him and turned him into a wolf, His own herd-boys hunt him down And his dogs tear at his haunches. Actaeon, torn apart by dogs incited by Artemis, finds another Near Eastern parallel in the Ugaritic hero Aqht, torn apart by eagles incited by Anath who wanted his hunting bow. The virginal Artemis of classical times is not directly comparable to Ishtar of the many lovers, but the mytheme of Artemis shooting Orion, was linked to her punishment of Actaeon by T.C.W. Stinton;<ref>Stinton "Euripides and the Judgement of Paris" (London, 1965:45 note 14) reprinted in Stinton, Collected Papers on Greek Tragedy (London, 1990:51 note 14).</ref> the Greek context of the mortal's reproach to the amorous goddess is translated to the episode of Anchises and Aphrodite. Daphnis too was a herdsman loved by a goddess and punished by her: see Theocritus' First Idyll. Symbolism regarding Actaeon In Greek Mythology, Actaeon is widely thought to symbolize ritual human sacrifice in attempt to please a God or Goddess: the dogs symbolize the sacrificers and Actaeon symbolizes the sacrifice. Actaeon may symbolize human curiosity or irreverence. The myth is seen by Jungian psychologist Wolfgang Giegerich as a symbol of spiritual transformation and/or enlightenment. Actaeon often symbolizes a cuckold, as when he is turned into a stag, he becomes "horned". This is alluded to in Shakespeare's Merry Wives, Robert Burton's Anatomy of Melancholy, and others.Gordon Williams, A Dictionary of Sexual Language and Imagery in Shakespearean and Stuart Literature, 2001, , p. 8-9 Cultural depictions The two main scenes are Actaeon surprising Artemis/Diana, and his death. In classical art Actaeon is normally shown as fully human, even as his hounds are killing him (sometimes he has small horns), but in Renaissance art he is often given a deer's head with antlers even in the scene with Diana, and by the time he is killed he has at the least this head, and has often completely transformed into the shape of a deer. Aeschylus and other tragic poets made use of the story, which was a favourite subject in ancient works of art. There is a well-known small marble group in the British Museum illustrative of the story, in gallery 83/84. Two paintings by the 16th century painter Titian (Death of Actaeon and Diana and Actaeon).Actéon, an operatic pastorale by Marc-Antoine Charpentier. Percy Bysshe Shelley suggests a parallel between his alter-ego and Actaeon in his elegy for John Keats, Adonais, stanza 31 ('[he] had gazed on Nature's naked loveliness/ Actaeon-like, and now he fled astray/ .../ And his own thoughts, along that rugged way,/ Pursued, like raging hounds, their father and their prey.') The aria "Oft she visits this lone mountain" from Purcell's Dido and Aeneas, first performed in 1689 or earlier. Giordano Bruno, "Gli Eroici Furori". In canto V of Giambattista Marino's poem "Adone" the protagonist goes to theater to see a tragedy representing the myth of Actaeon. This episode foreshadows the protagonist's violent death at the end of the book. In Act I Scene 2 of Jacques Offenbach's Orpheus in the Underworld, Actaeon is Diana (Artemis)'s lover, and it is Jupiter who turns him into a stag, which puts Diana off hunting. His story is relinquished at this point, in favour of the other plots. Ted Hughes wrote a version of the story in his Tales from Ovid. In Alexandre Dumas' novel La Reine Margot, Charles IX of France, fond of the hunt, has a much-loved and ill-fated hunting dog named Actaeon. Diane and Actéon Pas de Deux from Marius Petipa's ballet, Le Roi Candaule, to the music by Riccardo Drigo and Cesare Pugni, later incorporated into the second act of La Esmeralda (ballet). In Twelfth Night by William Shakespeare, Orsino compares his unrequited love for Olivia to the fate of Actaeon. "O, when mine eyes did see Olivia first, Methought she purged the air of pestilence, That instant was I turned into a hart, and my desires like fell and cruel hounds e'er since pursue me." Act 1 Scene 1. In Christopher Marlowe's play Edward II, courtier Piers Gaveston seeks to entertain his lover, King Edward II of England, by presenting a play based on the Actaeon myth. In Gaveston's version, Diane is played by a naked boy holding an olive branch to hide his loins, and it is the boy-Diane who transforms Actaeon into a hart and lets him be devoured by the hounds. Thus, Gaveston's (and Marlowe's) interpretation adds a strong element of homoeroticism, absent from the original myth. Paul Manship in 1925 created a set of copper statute of Diane and Actaeon, which in the Luce Lunder Smithsonian Institution. Diana at Her Bath by Pierre Klossovski (1956) Aktaion Energy is

at the least this head, and has often completely transformed into the shape of a deer. Aeschylus and other tragic poets made use of the story, which was a favourite subject in ancient works of art. There is a well-known small marble group in the British Museum illustrative of the story, in gallery 83/84. Two paintings by the 16th century painter Titian (Death of Actaeon and Diana and Actaeon).Actéon, an operatic pastorale by Marc-Antoine Charpentier. Percy Bysshe Shelley suggests a parallel between his alter-ego and Actaeon in his elegy for John Keats, Adonais, stanza 31 ('[he] had gazed on Nature's naked loveliness/ Actaeon-like, and now he fled astray/ .../ And his own thoughts, along that rugged way,/ Pursued, like raging hounds, their father and their prey.') The aria "Oft she visits this lone mountain" from Purcell's Dido and Aeneas, first performed in 1689 or earlier. Giordano Bruno, "Gli Eroici Furori". In canto V of Giambattista Marino's poem "Adone" the protagonist goes to theater to see a tragedy representing the myth of Actaeon. This episode foreshadows the protagonist's violent death at the end of the book. In Act I Scene 2 of Jacques Offenbach's Orpheus in the Underworld, Actaeon is Diana (Artemis)'s lover, and it is Jupiter who turns him into a stag, which puts Diana off hunting. His story is relinquished at this point, in favour of the other plots. Ted Hughes wrote a version of the story in his Tales from Ovid. In Alexandre Dumas' novel La Reine Margot, Charles IX of France, fond of the hunt, has a much-loved and ill-fated hunting dog named Actaeon. Diane and Actéon Pas de Deux from Marius Petipa's ballet, Le Roi Candaule, to the music by Riccardo Drigo and Cesare Pugni, later incorporated into the second act of La Esmeralda (ballet). In Twelfth Night by William Shakespeare, Orsino compares his unrequited love for Olivia to the fate of Actaeon. "O, when mine eyes did see Olivia first, Methought she purged the air of pestilence, That instant was I turned into a hart, and my desires like fell and cruel hounds e'er since pursue me." Act 1 Scene 1. In Christopher Marlowe's play Edward II, courtier Piers Gaveston seeks to entertain his lover, King Edward II of England, by presenting a play based on the Actaeon myth. In Gaveston's version, Diane is played by a naked boy holding an olive branch to hide his loins, and it is the boy-Diane who transforms Actaeon into a hart and lets him be devoured by the hounds. Thus, Gaveston's (and Marlowe's) interpretation adds a strong element of homoeroticism, absent from the original myth. Paul Manship in 1925 created a set of copper statute of Diane and Actaeon, which in the Luce Lunder Smithsonian Institution. Diana at Her Bath by Pierre Klossovski (1956) Aktaion Energy is the name of a local conglomerate with ties to the Dome event and The Hounds of Diana is a Dome conspiracy/Aktaion Energy watchdog website run by a member of Aktaion's IT department who goes by the alias Dromas. French based collective LFKs and his film/theatre director, writer and visual artist Jean Michel Bruyere produced a series of 600 shorts and "medium" films, an interactive 360°

aimed to control innovations in worship. This only made the dilemma more acute, with consequent continual litigation in the secular and ecclesiastical courts. Over the same period, Anglican churches engaged vigorously in Christian missions, resulting in the creation, by the end of the century, of over ninety colonial bishoprics, which gradually coalesced into new self-governing churches on the Canadian and American models. However, the case of John Colenso, Bishop of Natal, reinstated in 1865 by the English Judicial Committee of the Privy Council over the heads of the Church in South Africa, demonstrated acutely that the extension of episcopacy had to be accompanied by a recognised Anglican ecclesiology of ecclesiastical authority, distinct from secular power. Consequently, at the instigation of the bishops of Canada and South Africa, the first Lambeth Conference was called in 1867; to be followed by further conferences in 1878 and 1888, and thereafter at ten-year intervals. The various papers and declarations of successive Lambeth Conferences have served to frame the continued Anglican debate on identity, especially as relating to the possibility of ecumenical discussion with other churches. This ecumenical aspiration became much more of a possibility, as other denominational groups rapidly followed the example of the Anglican Communion in founding their own transnational alliances: the Alliance of Reformed Churches, the Ecumenical Methodist Council, the International Congregational Council, and the Baptist World Alliance. Theories Anglicanism was seen as a middle way, or via media, between two branches of Protestantism, Lutheranism and Reformed Christianity. In their rejection of absolute parliamentary authority, the Tractarians – and in particular John Henry Newman – looked back to the writings of 17th-century Anglican divines, finding in these texts the idea of the English church as a via media between the Protestant and Catholic traditions. This view was associated – especially in the writings of Edward Bouverie Pusey – with the theory of Anglicanism as one of three "branches" (alongside the Roman Catholic Church and the Orthodox Church) historically arising out of the common tradition of the earliest ecumenical councils. Newman himself subsequently rejected his theory of the via media, as essentially historicist and static and hence unable to accommodate any dynamic development within the church. Nevertheless, the aspiration to ground Anglican identity in the writings of the 17th-century divines and in faithfulness to the traditions of the Church Fathers reflects a continuing theme of Anglican ecclesiology, most recently in the writings of Henry Robert McAdoo. The Tractarian formulation of the theory of the via media between Protestantism and Roman Catholicism was essentially a party platform, and not acceptable to Anglicans outside the confines of the Oxford Movement. However, this theory of the via media was reworked in the ecclesiological writings of Frederick Denison Maurice, in a more dynamic form that became widely influential. Both Maurice and Newman saw the Church of England of their day as sorely deficient in faith; but whereas Newman had looked back to a distant past when the light of faith might have appeared to burn brighter, Maurice looked forward to the possibility of a brighter revelation of faith in the future. Maurice saw the Protestant and Catholic strands within the Church of England as contrary but complementary, both maintaining elements of the true church, but incomplete without the other; such that a true catholic and evangelical church might come into being by a union of opposites. Central to Maurice's perspective was his belief that the collective elements of family, nation, and church represented a divine order of structures through which God unfolds his continuing work of creation. Hence, for Maurice, the Protestant tradition had maintained the elements of national distinction which were amongst the marks of the true universal church, but which had been lost within contemporary Roman Catholicism in the internationalism of centralised papal authority. Within the coming universal church that Maurice foresaw, national churches would each maintain the six signs of Catholicity: baptism, Eucharist, the creeds, Scripture, an episcopal ministry, and a fixed liturgy (which could take a variety of forms in accordance with divinely ordained distinctions in national characteristics). Not surprisingly, this vision of a becoming universal church as a congregation of autonomous national churches proved highly congenial in Anglican circles; and Maurice's six signs were adapted to form the Chicago-Lambeth Quadrilateral of 1888. In the latter decades of the 20th century, Maurice's theory, and the various strands of Anglican thought that derived from it, have been criticised by Stephen Sykes, who argues that the terms Protestant and Catholic as used in these approaches are synthetic constructs denoting ecclesiastic identities unacceptable to those to whom the labels are applied. Hence, the Catholic Church does not regard itself as a party or strand within the universal church – but rather identifies itself as the universal church. Moreover, Sykes criticises the proposition, implicit in theories of via media, that there is no distinctive body of Anglican doctrines, other than those of the universal church; accusing this of being an excuse not to undertake systematic doctrine at all. Contrariwise, Sykes notes a high degree of commonality in Anglican liturgical forms and in the doctrinal understandings expressed within those liturgies. He proposes that Anglican identity might rather be found within a shared consistent pattern of prescriptive liturgies, established and maintained through canon law, and embodying both a historic deposit of formal statements of doctrine, and also framing the regular reading and proclamation of scripture. Sykes nevertheless agrees with those heirs of Maurice who emphasise the incompleteness of Anglicanism as a positive feature, and quotes with qualified approval the words of Michael Ramsey: Doctrine "Catholic and reformed" The distinction between Reformed and Catholic, and the coherence of the two, is a matter of debate within the Anglican Communion. The Oxford Movement of the mid-19th century revived and extended doctrinal, liturgical, and pastoral practices similar to those of Roman Catholicism. This extends beyond the ceremony of high church services to even more theologically significant territory, such as sacramental theology (see Anglican sacraments). While Anglo-Catholic practices, particularly liturgical ones, have become more common within the tradition over the last century, there are also places where practices and beliefs resonate more closely with the evangelical movements of the 1730s (see Sydney Anglicanism). Guiding principles For high-church Anglicans, doctrine is neither established by a magisterium, nor derived from the theology of an eponymous founder (such as Calvinism), nor summed up in a confession of faith beyond the ecumenical creeds (such as the Lutheran Book of Concord). For them, the earliest Anglican theological documents are its prayer books, which they see as the products of profound theological reflection, compromise, and synthesis. They emphasise the Book of Common Prayer as a key expression of Anglican doctrine. The principle of looking to the prayer books as a guide to the parameters of belief and practice is called by the Latin name lex orandi, lex credendi ("the law of prayer is the law of belief"). Within the prayer books are the fundamentals of Anglican doctrine: the Apostles' and Nicene creeds, the Athanasian Creed (now rarely used), the scriptures (via the lectionary), the sacraments, daily prayer, the catechism, and apostolic succession in the context of the historic threefold ministry. For some low-church and evangelical Anglicans, the 16th-century Reformed Thirty-Nine Articles form the basis of doctrine. Distinctives of Anglican belief The Thirty-Nine Articles played a significant role in Anglican doctrine and practice. Following the passing of the 1604 canons, all Anglican clergy had to formally subscribe to the articles. Today, however, the articles are no longer binding, but are seen as a historical document which has played a significant role in the shaping of Anglican identity. The degree to which each of the articles has remained influential varies. On the doctrine of justification, for example, there is a wide range of beliefs within the Anglican Communion, with some Anglo-Catholics arguing for a faith with good works and the sacraments. At the same time, however, some evangelical Anglicans ascribe to the Reformed emphasis on sola fide ("faith alone") in their doctrine of justification (see Sydney Anglicanism). Still other Anglicans adopt a nuanced view of justification, taking elements from the early Church Fathers, Catholicism, Protestantism, liberal theology, and latitudinarian thought. Arguably, the most influential of the original articles has been Article VI on the "sufficiency of scripture", which says that "Scripture containeth all things necessary to salvation: so that whatsoever is not read therein, nor may be proved thereby, is not to be required of any man, that it should be believed as an article of the Faith, or be thought requisite or necessary to salvation." This article has informed Anglican biblical exegesis and hermeneutics since earliest times. Anglicans look for authority in their "standard divines" (see below). Historically, the most influential of these – apart from Cranmer – has been the 16th-century cleric and theologian Richard Hooker, who after 1660 was increasingly portrayed as the founding father of Anglicanism. Hooker's description of Anglican authority as being derived primarily from scripture, informed by reason (the intellect and the experience of God) and tradition (the practices and beliefs of the historical church), has influenced Anglican self-identity and doctrinal reflection perhaps more powerfully than any other formula. The analogy of the "three-legged stool" of scripture, reason, and tradition is often incorrectly attributed to Hooker. Rather, Hooker's description is a hierarchy of authority, with scripture as foundational and reason and tradition as vitally important, but secondary, authorities. Finally, the extension of Anglicanism into non-English cultures, the growing diversity of prayer books, and the increasing interest in ecumenical dialogue have led to further reflection on the parameters of Anglican identity. Many Anglicans look to the Chicago-Lambeth Quadrilateral of 1888 as the sine qua non of communal identity. In brief, the quadrilateral's four points are the scriptures as containing all things necessary to salvation; the creeds (specifically, the Apostles' and Nicene Creeds) as the sufficient statement of Christian faith; the dominical sacraments of Baptism and Holy Communion; and the historic episcopate. Divines Within the Anglican tradition, "divines" are clergy of the Church of England whose theological writings have been considered standards for faith, doctrine, worship, and spirituality, and whose influence has permeated the Anglican Communion in varying degrees through the years. While there is no authoritative list of these Anglican divines, there are some whose names would likely be found on most lists – those who are commemorated in lesser feasts of the Anglican churches and those whose works are frequently anthologised. The corpus produced by Anglican divines is diverse. What they have in common is a commitment to the faith as conveyed by scripture and the Book of Common Prayer, thus regarding prayer and theology in a manner akin to that of the Apostolic Fathers. On the whole, Anglican divines view the via media of Anglicanism not as a compromise, but as "a positive position, witnessing to the universality of God and God's kingdom working through the fallible, earthly ecclesia Anglicana". These theologians regard scripture as interpreted through tradition and reason as authoritative in matters concerning salvation. Reason and tradition, indeed, is extant in and presupposed by scripture, thus implying co-operation between God and humanity, God and nature, and between the sacred and secular. Faith is thus regarded as incarnational and authority as dispersed. Amongst the early Anglican divines of the 16th and 17th centuries, the names of Thomas Cranmer, John Jewel, Matthew Parker, Richard Hooker, Lancelot Andrewes, and Jeremy Taylor predominate. The influential character of Hooker's Of the Laws of Ecclesiastical Polity cannot be overestimated. Published in 1593 and subsequently, Hooker's eight-volume work is primarily a treatise on church-state relations, but it deals comprehensively with issues of biblical interpretation, soteriology, ethics, and sanctification. Throughout the work, Hooker makes clear that theology involves prayer and is concerned with ultimate issues and that theology is relevant to the social mission of the church. The 18th century saw the rise of two important movements in Anglicanism: Cambridge Platonism, with its mystical understanding of reason as the "candle of the Lord", and the evangelical revival, with its emphasis on the personal experience of the Holy Spirit. The Cambridge Platonist movement evolved into a school called Latitudinarianism, which emphasised reason as the barometer of discernment and took a stance of indifference towards doctrinal and ecclesiological differences. The evangelical revival, influenced by such figures as John Wesley and Charles Simeon, re-emphasised the importance of justification through faith and the consequent importance of personal conversion. Some in this movement, such as Wesley and George Whitefield, took the message to the United States, influencing the First Great Awakening and creating an Anglo-American movement called Methodism that would eventually break away, structurally, from the Anglican churches after the American Revolution. By the 19th century, there was a renewed interest in pre-Reformation English religious thought and practice. Theologians such as John Keble, Edward Bouverie Pusey, and John Henry Newman had widespread influence in the realm of polemics, homiletics and theological and devotional works, not least because they largely repudiated the old high-church tradition and replaced it with a dynamic appeal to antiquity which looked beyond the Reformers and Anglican formularies. Their work is largely credited with the development of the Oxford Movement, which sought to reassert Catholic identity and practice in Anglicanism. In contrast to this movement, clergy such as the Bishop of Liverpool, J. C. Ryle, sought to uphold the distinctly Reformed identity of the Church of England. He was not a servant of the status quo, but argued for a lively religion which emphasised grace, holy and charitable living, and the plain use of the 1662 Book of Common Prayer (interpreted in a partisan evangelical way) without additional rituals. Frederick Denison Maurice, through such works as The Kingdom of Christ, played a pivotal role in inaugurating another movement, Christian socialism. In this, Maurice transformed Hooker's emphasis on the incarnational nature of Anglican spirituality to an imperative for social justice. In the 19th century, Anglican biblical scholarship began to assume a distinct character, represented by the so-called "Cambridge triumvirate" of Joseph Lightfoot, F. J. A. Hort, and Brooke Foss Westcott. Their orientation is best summed up by Westcott's observation that "Life which Christ is and which Christ communicates, the life which fills our whole beings as we realise its capacities, is active fellowship with God." The earlier part of the 20th century is marked by Charles Gore, with his emphasis on natural revelation, and William Temple's focus on Christianity and society, while, from outside England, Robert Leighton, Archbishop of Glasgow, and several clergy from the United States have been suggested, such as William Porcher DuBose, John Henry Hobart (1775–1830, Bishop of New York 1816–30), William Meade, Phillips Brooks, and Charles Brent. Churchmanship Churchmanship can be defined as the manifestation of theology in the realms of liturgy, piety and, to some extent, spirituality. Anglican diversity in this respect has tended to reflect the diversity in the tradition's Reformed and Catholic identity. Different individuals, groups, parishes, dioceses and provinces may identify more closely with one or the other, or some mixture of the two. The range of Anglican belief and practice became particularly divisive during the 19th century, when some clergy were disciplined and even imprisoned on charges of introducing illegal ritual while, at the same time, others were criticised for engaging in public worship services with ministers of Reformed churches. Resistance to the growing acceptance and restoration of traditional Catholic ceremonial by the mainstream of Anglicanism ultimately led to the formation of small breakaway churches such as the Free Church of England in England (1844) and the Reformed Episcopal Church in North America (1873). Anglo-Catholic (and some broad-church) Anglicans celebrate public liturgy in ways that understand worship to be something very special and of utmost importance. Vestments are worn by the clergy, sung settings are often used, and incense may be used. Nowadays, in most Anglican churches, the Eucharist is celebrated in a manner similar to the usage of Roman Catholics and some Lutherans, though, in many churches, more traditional, "pre–Vatican II" models of worship are common (e.g., an "eastward orientation" at the altar). Whilst many Anglo-Catholics derive much of their liturgical practice from that of the pre-Reformation English church, others more closely follow traditional Roman Catholic practices. The Eucharist may sometimes be celebrated in the form known as High Mass, with a priest, deacon and subdeacon (usually actually a layperson) dressed in traditional vestments, with incense and sanctus bells and prayers adapted from the Roman Missal or other sources by the celebrant. Such churches may also have forms of eucharistic adoration such as Benediction of the Blessed Sacrament. In terms of personal piety, some Anglicans may recite the Rosary and Angelus, be involved in a devotional society dedicated to "Our Lady" (the Blessed Virgin Mary) and seek the intercession of the saints. In recent decades, the prayer books of several provinces have, out of deference to a greater agreement with Eastern Conciliarism (and a perceived greater respect accorded Anglicanism by Eastern Orthodoxy than by Roman Catholicism), instituted a number of historically Eastern and Oriental Orthodox elements in their liturgies, including introduction of the Trisagion and deletion of the filioque clause from the Nicene Creed. For their part, those evangelical (and some broad-church) Anglicans who emphasise the more Protestant aspects of the Church stress the Reformation theme of salvation by grace through faith. They emphasise the two dominical sacraments of Baptism and Eucharist, viewing the other five as "lesser rites". Some evangelical Anglicans may even tend to take the inerrancy of scripture literally, adopting the view of Article VI that it contains all things necessary to salvation in an explicit sense. Worship in churches influenced by these principles tends to be significantly less elaborate, with greater emphasis on the Liturgy of the Word (the reading of the scriptures, the sermon, and the intercessory prayers). The Order for Holy Communion may be celebrated bi-weekly or monthly (in preference to the daily offices), by priests attired in choir habit, or more regular clothes, rather than Eucharistic vestments. Ceremony may be in keeping with their view of the provisions of the 17th-century Puritans – being a Reformed interpretation of the Ornaments Rubric – no candles, no incense, no bells, and a minimum of manual actions by the presiding celebrant (such as touching the elements at the Words of Institution). In recent decades, there has been a growth of charismatic worship among Anglicans. Both Anglo-Catholics and evangelicals have been affected by this movement such that it is not uncommon to find typically charismatic postures, music, and other themes evident during the services of otherwise Anglo-Catholic or evangelical parishes. The spectrum of Anglican beliefs and practice is too large to be fit into these labels. Many Anglicans locate themselves somewhere in the spectrum of the broad-church tradition and consider themselves an amalgam of evangelical and Catholic. Such Anglicans stress that Anglicanism is the via media (middle way) between the two major strains of Western Christianity and that Anglicanism is like a "bridge" between the two strains. Sacramental doctrine and practice In accord with its prevailing self-identity as a via media or "middle path" of Western Christianity, Anglican sacramental theology expresses elements in keeping with its status as being both a church in the Catholic tradition as well as a Reformed church. With respect to sacramental theology, the Catholic heritage is perhaps most strongly asserted in the importance Anglicanism places on the sacraments as a means of grace, sanctification, and salvation, as expressed in the church's liturgy and doctrine. Of the seven sacraments, all Anglicans recognise Baptism and the Eucharist as being directly instituted by Christ. The other five – Confession/Absolution, Matrimony, Confirmation, Holy Orders (also called Ordination), and Anointing of the Sick (also called Unction) – are regarded variously as full sacraments by Anglo-Catholics and many high church and some broad-church Anglicans, but merely as "sacramental rites" by other broad-church and low-church Anglicans, especially evangelicals associated with Reform UK and the Diocese of Sydney. Eucharistic theology Anglican eucharistic theology is divergent in practice, reflecting the essential comprehensiveness of the tradition. A few low-church Anglicans take a strictly memorialist (Zwinglian) view of the sacrament. In other words, they see Holy Communion as a memorial to Christ's suffering, and participation in the Eucharist as both a re-enactment of the Last Supper and a foreshadowing of the heavenly banquet – the fulfilment of the eucharistic promise. Other low-church Anglicans believe in the real presence of Christ in the Eucharist but deny that the presence of Christ is carnal or is necessarily localised in the bread and wine. Despite explicit criticism in the Thirty-Nine Articles, many high-church or Anglo-Catholic Anglicans hold, more or less, the Catholic view of the real presence as expressed in the doctrine of transubstantiation, seeing the Eucharist as a liturgical representation of Christ's atoning sacrifice with the elements actually transformed into Christ's body and blood. The majority of Anglicans, however, have in common a belief in the real presence, defined in one way or another. To that extent, they are in the company of the continental reformer Martin Luther and Calvin rather than Ulrich Zwingli. The Catechism of the American BCP of 1976 repeats the standard Anglican view ("The outward and visible sign in the Eucharist is the bread and wine"..."The inward and spiritual grace in the Holy Communion is the Body and Blood of Christ given to his people, and received by faith") without further definition. It should be remembered that Anglicanism has no official doctrine on this matter, believing it is wiser to leave the Presence a mystery. The faithful can believe privately whatever explanation they favor, be it transubstantiation, consubstantiation, receptionism, or virtualism (the two most congenial to Anglicans for centuries until the Oxford Movement), each of which espouses belief in the real presence in one way or another, or memorialism, which has never been an option with Anglicans. A famous Anglican aphorism regarding Christ's presence in the sacrament, commonly misattributed to Queen Elizabeth I, is first found in print in a poem by John Donne: He was the word that spake it, He took the bread and brake it: And what that word did make it, I do believe and take it. An Anglican position on the eucharistic sacrifice ("Sacrifice of the Mass") was expressed in the response Saepius officio of the Archbishops of Canterbury and York to Pope Leo XIII's Papal Encyclical Apostolicae curae: viz. that the Prayer Book contained a strong sacrificial theology. Later revisions of the Prayer Book influenced by the Scottish Canon of 1764 first adopted by the Protestant Episcopal Church in 1789 made this assertion quite evident: "we do make and celebrate before thy Divine Majesty with these thy holy gifts, which we now OFFER unto thee, the memorial thy Son has commanded us to make", which is repeated in the 1929 English BCP and included in such words or others such as "present" or "show forth" in subsequent revisions. Anglican and Roman Catholic representatives declared that they had "substantial agreement on the doctrine of the Eucharist" in the Windsor Statement on Eucharistic Doctrine by the Anglican-Roman Catholic International Consultation (1971) and the Elucidation of the ARCIC Windsor Statement (1979). The final response (1991) to these documents by the Vatican made it plain that it did not consider the degree of agreement reached to be satisfactory. Practices In Anglicanism, there is a distinction between liturgy, which is the formal public and communal worship of the Church, and personal prayer and devotion, which may be public or private. Liturgy is regulated by the prayer books and consists of the Holy Eucharist (some call it Holy Communion or Mass), the other six Sacraments, and the Divine Office or Liturgy of the Hours. Book of Common Prayer The Book of Common Prayer (BCP) is the foundational prayer book of Anglicanism. The original book of 1549 (revised in 1552) was one of the instruments of the English Reformation, replacing the various "uses" or rites in Latin that had been used in different parts of the country with a single compact volume in the language of the people, so that "now from henceforth all the Realm shall have but one use". Suppressed under Queen Mary I, it was revised in 1559, and then again in 1662, after the Restoration of Charles II. This version was made mandatory in England and Wales by the Act of Uniformity and was in

1888, and thereafter at ten-year intervals. The various papers and declarations of successive Lambeth Conferences have served to frame the continued Anglican debate on identity, especially as relating to the possibility of ecumenical discussion with other churches. This ecumenical aspiration became much more of a possibility, as other denominational groups rapidly followed the example of the Anglican Communion in founding their own transnational alliances: the Alliance of Reformed Churches, the Ecumenical Methodist Council, the International Congregational Council, and the Baptist World Alliance. Theories Anglicanism was seen as a middle way, or via media, between two branches of Protestantism, Lutheranism and Reformed Christianity. In their rejection of absolute parliamentary authority, the Tractarians – and in particular John Henry Newman – looked back to the writings of 17th-century Anglican divines, finding in these texts the idea of the English church as a via media between the Protestant and Catholic traditions. This view was associated – especially in the writings of Edward Bouverie Pusey – with the theory of Anglicanism as one of three "branches" (alongside the Roman Catholic Church and the Orthodox Church) historically arising out of the common tradition of the earliest ecumenical councils. Newman himself subsequently rejected his theory of the via media, as essentially historicist and static and hence unable to accommodate any dynamic development within the church. Nevertheless, the aspiration to ground Anglican identity in the writings of the 17th-century divines and in faithfulness to the traditions of the Church Fathers reflects a continuing theme of Anglican ecclesiology, most recently in the writings of Henry Robert McAdoo. The Tractarian formulation of the theory of the via media between Protestantism and Roman Catholicism was essentially a party platform, and not acceptable to Anglicans outside the confines of the Oxford Movement. However, this theory of the via media was reworked in the ecclesiological writings of Frederick Denison Maurice, in a more dynamic form that became widely influential. Both Maurice and Newman saw the Church of England of their day as sorely deficient in faith; but whereas Newman had looked back to a distant past when the light of faith might have appeared to burn brighter, Maurice looked forward to the possibility of a brighter revelation of faith in the future. Maurice saw the Protestant and Catholic strands within the Church of England as contrary but complementary, both maintaining elements of the true church, but incomplete without the other; such that a true catholic and evangelical church might come into being by a union of opposites. Central to Maurice's perspective was his belief that the collective elements of family, nation, and church represented a divine order of structures through which God unfolds his continuing work of creation. Hence, for Maurice, the Protestant tradition had maintained the elements of national distinction which were amongst the marks of the true universal church, but which had been lost within contemporary Roman Catholicism in the internationalism of centralised papal authority. Within the coming universal church that Maurice foresaw, national churches would each maintain the six signs of Catholicity: baptism, Eucharist, the creeds, Scripture, an episcopal ministry, and a fixed liturgy (which could take a variety of forms in accordance with divinely ordained distinctions in national characteristics). Not surprisingly, this vision of a becoming universal church as a congregation of autonomous national churches proved highly congenial in Anglican circles; and Maurice's six signs were adapted to form the Chicago-Lambeth Quadrilateral of 1888. In the latter decades of the 20th century, Maurice's theory, and the various strands of Anglican thought that derived from it, have been criticised by Stephen Sykes, who argues that the terms Protestant and Catholic as used in these approaches are synthetic constructs denoting ecclesiastic identities unacceptable to those to whom the labels are applied. Hence, the Catholic Church does not regard itself as a party or strand within the universal church – but rather identifies itself as the universal church. Moreover, Sykes criticises the proposition, implicit in theories of via media, that there is no distinctive body of Anglican doctrines, other than those of the universal church; accusing this of being an excuse not to undertake systematic doctrine at all. Contrariwise, Sykes notes a high degree of commonality in Anglican liturgical forms and in the doctrinal understandings expressed within those liturgies. He proposes that Anglican identity might rather be found within a shared consistent pattern of prescriptive liturgies, established and maintained through canon law, and embodying both a historic deposit of formal statements of doctrine, and also framing the regular reading and proclamation of scripture. Sykes nevertheless agrees with those heirs of Maurice who emphasise the incompleteness of Anglicanism as a positive feature, and quotes with qualified approval the words of Michael Ramsey: Doctrine "Catholic and reformed" The distinction between Reformed and Catholic, and the coherence of the two, is a matter of debate within the Anglican Communion. The Oxford Movement of the mid-19th century revived and extended doctrinal, liturgical, and pastoral practices similar to those of Roman Catholicism. This extends beyond the ceremony of high church services to even more theologically significant territory, such as sacramental theology (see Anglican sacraments). While Anglo-Catholic practices, particularly liturgical ones, have become more common within the tradition over the last century, there are also places where practices and beliefs resonate more closely with the evangelical movements of the 1730s (see Sydney Anglicanism). Guiding principles For high-church Anglicans, doctrine is neither established by a magisterium, nor derived from the theology of an eponymous founder (such as Calvinism), nor summed up in a confession of faith beyond the ecumenical creeds (such as the Lutheran Book of Concord). For them, the earliest Anglican theological documents are its prayer books, which they see as the products of profound theological reflection, compromise, and synthesis. They emphasise the Book of Common Prayer as a key expression of Anglican doctrine. The principle of looking to the prayer books as a guide to the parameters of belief and practice is called by the Latin name lex orandi, lex credendi ("the law of prayer is the law of belief"). Within the prayer books are the fundamentals of Anglican doctrine: the Apostles' and Nicene creeds, the Athanasian Creed (now rarely used), the scriptures (via the lectionary), the sacraments, daily prayer, the catechism, and apostolic succession in the context of the historic threefold ministry. For some low-church and evangelical Anglicans, the 16th-century Reformed Thirty-Nine Articles form the basis of doctrine. Distinctives of Anglican belief The Thirty-Nine Articles played a significant role in Anglican doctrine and practice. Following the passing of the 1604 canons, all Anglican clergy had to formally subscribe to the articles. Today, however, the articles are no longer binding, but are seen as a historical document which has played a significant role in the shaping of Anglican identity. The degree to which each of the articles has remained influential varies. On the doctrine of justification, for example, there is a wide range of beliefs within the Anglican Communion, with some Anglo-Catholics arguing for a faith with good works and the sacraments. At the same time, however, some evangelical Anglicans ascribe to the Reformed emphasis on sola fide ("faith alone") in their doctrine of justification (see Sydney Anglicanism). Still other Anglicans adopt a nuanced view of justification, taking elements from the early Church Fathers, Catholicism, Protestantism, liberal theology, and latitudinarian thought. Arguably, the most influential of the original articles has been Article VI on the "sufficiency of scripture", which says that "Scripture containeth all things necessary to salvation: so that whatsoever is not read therein, nor may be proved thereby, is not to be required of any man, that it should be believed as an article of the Faith, or be thought requisite or necessary to salvation." This article has informed Anglican biblical exegesis and hermeneutics since earliest times. Anglicans look for authority in their "standard divines" (see below). Historically, the most influential of these – apart from Cranmer – has been the 16th-century cleric and theologian Richard Hooker, who after 1660 was increasingly portrayed as the founding father of Anglicanism. Hooker's description of Anglican authority as being derived primarily from scripture, informed by reason (the intellect and the experience of God) and tradition (the practices and beliefs of the historical church), has influenced Anglican self-identity and doctrinal reflection perhaps more powerfully than any other formula. The analogy of the "three-legged stool" of scripture, reason, and tradition is often incorrectly attributed to Hooker. Rather, Hooker's description is a hierarchy of authority, with scripture as foundational and reason and tradition as vitally important, but secondary, authorities. Finally, the extension of Anglicanism into non-English cultures, the growing diversity of prayer books, and the increasing interest in ecumenical dialogue have led to further reflection on the parameters of Anglican identity. Many Anglicans look to the Chicago-Lambeth Quadrilateral of 1888 as the sine qua non of communal identity. In brief, the quadrilateral's four points are the scriptures as containing all things necessary to salvation; the creeds (specifically, the Apostles' and Nicene Creeds) as the sufficient statement of Christian faith; the dominical sacraments of Baptism and Holy Communion; and the historic episcopate. Divines Within the Anglican tradition, "divines" are clergy of the Church of England whose theological writings have been considered standards for faith, doctrine, worship, and spirituality, and whose influence has permeated the Anglican Communion in varying degrees through the years. While there is no authoritative list of these Anglican divines, there are some whose names would likely be found on most lists – those who are commemorated in lesser feasts of the Anglican churches and those whose works are frequently anthologised. The corpus produced by Anglican divines is diverse. What they have in common is a commitment to the faith as conveyed by scripture and the Book of Common Prayer, thus regarding prayer and theology in a manner akin to that of the Apostolic Fathers. On the whole, Anglican divines view the via media of Anglicanism not as a compromise, but as "a positive position, witnessing to the universality of God and God's kingdom working through the fallible, earthly ecclesia Anglicana". These theologians regard scripture as interpreted through tradition and reason as authoritative in matters concerning salvation. Reason and tradition, indeed, is extant in and presupposed by scripture, thus implying co-operation between God and humanity, God and nature, and between the sacred and secular. Faith is thus regarded as incarnational and authority as dispersed. Amongst the early Anglican divines of the 16th and 17th centuries, the names of Thomas Cranmer, John Jewel, Matthew Parker, Richard Hooker, Lancelot Andrewes, and Jeremy Taylor predominate. The influential character of Hooker's Of the Laws of Ecclesiastical Polity cannot be overestimated. Published in 1593 and subsequently, Hooker's eight-volume work is primarily a treatise on church-state relations, but it deals comprehensively with issues of biblical interpretation, soteriology, ethics, and sanctification. Throughout the work, Hooker makes clear that theology involves prayer and is concerned with ultimate issues and that theology is relevant to the social mission of the church. The 18th century saw the rise of two important movements in Anglicanism: Cambridge Platonism, with its mystical understanding of reason as the "candle of the Lord", and the evangelical revival, with its emphasis on the personal experience of the Holy Spirit. The Cambridge Platonist movement evolved into a school called Latitudinarianism, which emphasised reason as the barometer of discernment and took a stance of indifference towards doctrinal and ecclesiological differences. The evangelical revival, influenced by such figures as John Wesley and Charles Simeon, re-emphasised the importance of justification through faith and the consequent importance of personal conversion. Some in this movement, such as Wesley and George Whitefield, took the message to the United States, influencing the First Great Awakening and creating an Anglo-American movement called Methodism that would eventually break away, structurally, from the Anglican churches after the American Revolution. By the 19th century, there was a renewed interest in pre-Reformation English religious thought and practice. Theologians such as John Keble, Edward Bouverie Pusey, and John Henry Newman had widespread influence in the realm of polemics, homiletics and theological and devotional works, not least because they largely repudiated the old high-church tradition and replaced it with a dynamic appeal to antiquity which looked beyond the Reformers and Anglican formularies. Their work is largely credited with the development of the Oxford Movement, which sought to reassert Catholic identity and practice in Anglicanism. In contrast to this movement, clergy such as the Bishop of Liverpool, J. C. Ryle, sought to uphold the distinctly Reformed identity of the Church of England. He was not a servant of the status quo, but argued for a lively religion which emphasised grace, holy and charitable living, and the plain use of the 1662 Book of Common Prayer (interpreted in a partisan evangelical way) without additional rituals. Frederick Denison Maurice, through such works as The Kingdom of Christ, played a pivotal role in inaugurating another movement, Christian socialism. In this, Maurice transformed Hooker's emphasis on the incarnational nature of Anglican spirituality to an imperative for social justice. In the 19th century, Anglican biblical scholarship began to assume a distinct character, represented by the so-called "Cambridge triumvirate" of Joseph Lightfoot, F. J. A. Hort, and Brooke Foss Westcott. Their orientation is best summed up by Westcott's observation that "Life which Christ is and which Christ communicates, the life which fills our whole beings as we realise its capacities, is active fellowship with God." The earlier part of the 20th century is marked by Charles Gore, with his emphasis on natural revelation, and William Temple's focus on Christianity and society, while, from outside England, Robert Leighton, Archbishop of Glasgow, and several clergy from the United States have been suggested, such as William Porcher DuBose, John Henry Hobart (1775–1830, Bishop of New York 1816–30), William Meade, Phillips Brooks, and Charles Brent. Churchmanship Churchmanship can be defined as the manifestation of theology in the realms of liturgy, piety and, to some extent, spirituality. Anglican diversity in this respect has tended to reflect the diversity in the tradition's Reformed and Catholic identity. Different individuals, groups, parishes, dioceses and provinces may identify more closely with one or the other, or some mixture of the two. The range of Anglican belief and practice became particularly divisive during the 19th century, when some clergy were disciplined and even imprisoned on charges of introducing illegal ritual while, at the same time, others were criticised for engaging in public worship services with ministers of Reformed churches. Resistance to the growing acceptance and restoration of traditional Catholic ceremonial by the mainstream of Anglicanism ultimately led to the formation of small breakaway churches such as the Free Church of England in England (1844) and the Reformed Episcopal Church in North America (1873). Anglo-Catholic (and some broad-church) Anglicans celebrate public liturgy in ways that understand worship to be something very special and of utmost importance. Vestments are worn by the clergy, sung settings are often used, and incense may be used. Nowadays, in most Anglican churches, the Eucharist is celebrated in a manner similar to the usage of Roman Catholics and some Lutherans, though, in many churches, more traditional, "pre–Vatican II" models of worship are common (e.g., an "eastward orientation" at the altar). Whilst many Anglo-Catholics derive much of their liturgical practice from that of the pre-Reformation English church, others more closely follow traditional Roman Catholic practices. The Eucharist may sometimes be celebrated in the form known as High Mass, with a priest, deacon and subdeacon (usually actually a layperson) dressed in traditional vestments, with incense and sanctus bells and prayers adapted from the Roman Missal or other sources by the celebrant. Such churches may also have forms of eucharistic adoration such as Benediction of the Blessed Sacrament. In terms of personal piety, some Anglicans may recite the Rosary and Angelus, be involved in a devotional society dedicated to "Our Lady" (the Blessed Virgin Mary) and seek the intercession of the saints. In recent decades, the prayer books of several provinces have, out of deference to a greater agreement with Eastern Conciliarism (and a perceived greater respect accorded Anglicanism by Eastern Orthodoxy than by Roman Catholicism), instituted a number of historically Eastern and Oriental Orthodox elements in their liturgies, including introduction of the Trisagion and deletion of the filioque clause from the Nicene Creed. For their part, those evangelical (and some broad-church) Anglicans who emphasise the more Protestant aspects of the Church stress the Reformation theme of salvation by grace through faith. They emphasise the two dominical sacraments of Baptism and Eucharist, viewing the other five as "lesser rites". Some evangelical Anglicans may even tend to take the inerrancy of scripture literally, adopting the view of Article VI that it contains all things necessary to salvation in an explicit sense. Worship in churches influenced by these principles tends to be significantly less elaborate, with greater emphasis on the Liturgy of the Word (the reading of the scriptures, the sermon, and the intercessory prayers). The Order for Holy Communion may be celebrated bi-weekly or monthly (in preference to the daily offices), by priests attired in choir habit, or more regular clothes, rather than Eucharistic vestments. Ceremony may be in keeping with their view of the provisions of the 17th-century Puritans – being a Reformed interpretation of the Ornaments Rubric – no candles, no incense, no bells, and a minimum of manual actions by the presiding celebrant (such as touching the elements at the Words of Institution). In recent decades, there has been a growth of charismatic worship among Anglicans. Both Anglo-Catholics and evangelicals have been affected by this movement such that it is not uncommon to find typically charismatic postures, music, and other themes evident during the services of otherwise Anglo-Catholic or evangelical parishes. The spectrum of Anglican beliefs and practice is too large to be fit into these labels. Many Anglicans locate themselves somewhere in the spectrum of the broad-church tradition and consider themselves an amalgam of evangelical and Catholic. Such Anglicans stress that Anglicanism is the via media (middle way) between the two major strains of Western Christianity and that Anglicanism is like a "bridge" between the two strains. Sacramental doctrine and practice In accord with its prevailing self-identity as a via media or "middle path" of Western Christianity, Anglican sacramental theology expresses elements in keeping with its status as being both a church in the Catholic tradition as well as a Reformed church. With respect to sacramental theology, the Catholic heritage is perhaps most strongly asserted in the importance Anglicanism places on the sacraments as a means of grace, sanctification, and salvation, as expressed in the church's liturgy and doctrine. Of the seven sacraments, all Anglicans recognise Baptism and the Eucharist as being directly instituted by Christ. The other five – Confession/Absolution, Matrimony, Confirmation, Holy Orders (also called Ordination), and Anointing of the Sick (also called Unction) – are regarded variously as full sacraments by Anglo-Catholics and many high church and some broad-church Anglicans, but merely as "sacramental rites" by other broad-church and low-church Anglicans, especially evangelicals associated with Reform UK and the Diocese of Sydney. Eucharistic theology Anglican eucharistic theology is divergent in practice, reflecting the essential comprehensiveness of the tradition. A few low-church Anglicans take a strictly memorialist (Zwinglian) view of the sacrament. In other words, they see Holy Communion as a memorial to Christ's suffering, and participation in the Eucharist as both a re-enactment of the Last Supper and a foreshadowing of the heavenly banquet – the fulfilment of the eucharistic promise. Other low-church Anglicans believe in the real presence of Christ in the Eucharist but deny that the presence of Christ is carnal or is necessarily localised in the bread and wine. Despite explicit criticism in the Thirty-Nine Articles, many high-church or Anglo-Catholic Anglicans hold, more or less, the Catholic view of the real presence as expressed in the doctrine of transubstantiation, seeing the Eucharist as a liturgical representation of Christ's atoning sacrifice with the elements actually transformed into Christ's body and blood. The majority of Anglicans, however, have in common a belief in the real presence, defined in one way or another. To that extent, they are in the company of the continental reformer Martin Luther and Calvin rather than Ulrich Zwingli. The Catechism of the American BCP of 1976 repeats the standard Anglican view ("The outward and visible sign in the Eucharist is the bread and wine"..."The inward and spiritual grace in the Holy Communion is the Body and Blood of Christ given to his people, and received by faith") without further definition. It should be remembered that Anglicanism has no official doctrine on this matter, believing it is wiser to leave the Presence a mystery. The faithful can believe privately whatever explanation they favor, be it transubstantiation, consubstantiation, receptionism, or virtualism (the two most congenial to Anglicans for centuries until the Oxford Movement), each of which espouses belief in the real presence in one way or another, or memorialism, which has never been an option with Anglicans. A famous Anglican aphorism regarding Christ's presence in the sacrament, commonly misattributed to Queen Elizabeth I, is first found in print in a poem by John Donne: He was the word that spake it, He took the bread and brake it: And what that word did make it, I do believe and take it. An Anglican position on the eucharistic sacrifice ("Sacrifice of the Mass") was expressed in the response Saepius officio of the Archbishops of Canterbury and York to Pope Leo XIII's Papal Encyclical Apostolicae curae: viz. that the Prayer Book contained a strong sacrificial theology. Later revisions of the Prayer Book influenced by the Scottish Canon of 1764 first adopted by the Protestant Episcopal Church in 1789 made this assertion quite evident: "we do make and celebrate before thy Divine Majesty with these thy holy gifts, which we now OFFER unto thee, the memorial thy Son has commanded us to make", which is repeated in the 1929 English BCP and included in such words or others such as "present" or "show forth" in subsequent revisions. Anglican and Roman Catholic representatives declared that they had "substantial agreement on the doctrine of the Eucharist" in the Windsor Statement on Eucharistic Doctrine by the Anglican-Roman Catholic International Consultation (1971) and the Elucidation of the ARCIC Windsor Statement (1979). The final response (1991) to these documents by the Vatican made it plain that it did not consider the degree of agreement reached to be satisfactory. Practices In Anglicanism, there is a distinction between liturgy, which is the formal public and communal worship of the Church, and personal prayer and devotion, which may be public or private. Liturgy is regulated by the prayer books and consists of the Holy Eucharist (some call it Holy Communion or Mass), the other six Sacraments, and the Divine Office or Liturgy of the Hours. Book of Common Prayer The Book of Common Prayer (BCP) is the foundational prayer book of Anglicanism. The original book of 1549 (revised in 1552) was one of the instruments of the English Reformation, replacing the various "uses" or rites in Latin that had been used in different parts of the country with a single compact volume in the language of the people, so that "now from henceforth all the Realm shall have but one use". Suppressed under Queen Mary I, it was revised in 1559, and then again in 1662, after the Restoration of Charles II. This version was made mandatory in England and Wales by the Act of Uniformity and was in standard use until the mid-20th century. With British colonial expansion from the 17th century onwards, Anglican churches were planted around the globe. These churches at first used and then revised the Book of Common Prayer until they, like their parent church, produced prayer books which took into account the developments in liturgical study and practice in the 19th and 20th centuries, which come under the general heading of the Liturgical Movement. Worship Anglican worship services are open to all visitors. Anglican worship originates principally in the reforms of Thomas Cranmer, who aimed to create a set order of service like that of the pre-Reformation church but less complex in its seasonal variety and said in English rather than Latin. This use of a set order of service is not unlike the Catholic tradition. Traditionally, the pattern was that laid out in the Book of Common Prayer. Although many Anglican churches now use a wide range of modern service books written in the local language, the structures of the Book of Common Prayer are largely retained. Churches which call themselves Anglican will have identified themselves so because they use some form or variant of the Book of Common Prayer in the shaping of their worship. Anglican worship, however, is as diverse as Anglican theology. A contemporary "low-church" service may differ little from the worship of many mainstream non-Anglican Protestant churches. The service is constructed around a sermon focused on Biblical exposition and opened with one or more Bible readings and closed by a series of prayers (both set and extemporised) and hymns or songs. A "high church" or Anglo-Catholic service, by contrast, is usually a more formal liturgy celebrated by

Athens area and Athens itself between 14–17 February 2021, when snow blanketed the entire city and its suburbs from the north to the furthest south, coastal suburbs, with depth ranges up to in Central Athens., and with even the Acropolis of Athens completely covered with snow. The National Meteorological Service (EMY) described it was one of the most intense snow storms over the past 40 years. Heavy snow was also reported in Athens on January 24, 2022, with reported locally in the higher elevations. Athens is affected by the urban heat island effect in some areas which is caused by human activity, altering its temperatures compared to the surrounding rural areas, and leaving detrimental effects on energy usage, expenditure for cooling, and health. The urban heat island of the city has also been found to be partially responsible for alterations of the climatological temperature time-series of specific Athens meteorological stations, because of its impact on the temperatures and the temperature trends recorded by some meteorological stations. On the other hand, specific meteorological stations, such as the National Garden station and Thiseio meteorological station, are less affected or do not experience the urban heat island. Athens holds the World Meteorological Organization record for the highest temperature ever recorded in Europe, at , which was recorded in the Elefsina and Tatoi suburbs of Athens on 10 July 1977. Locations Neighbourhoods of the center of Athens (Municipality of Athens) The Municipality of Athens, the City Centre of the Athens Urban Area, is divided into several districts: Omonoia, Syntagma, Exarcheia, Agios Nikolaos, Neapolis, Lykavittos, Lofos Strefi, Lofos Finopoulou, Lofos Filopappou, Pedion Areos, Metaxourgeio, Aghios Kostantinos, Larissa Station, Kerameikos, Psiri, Monastiraki, Gazi, Thission, Kapnikarea, Aghia Irini, Aerides, Anafiotika, Plaka, Acropolis, Pnyka, Makrygianni, Lofos Ardittou, Zappeion, Aghios Spyridon, Pangrati, Kolonaki, Dexameni, Evaggelismos, Gouva, Aghios Ioannis, Neos Kosmos, Koukaki, Kynosargous, Fix, Ano Petralona, Kato Petralona, Rouf, Votanikos, Profitis Daniil, Akadimia Platonos, Kolonos, Kolokynthou, Attikis Square, Lofos Skouze, Sepolia, Kypseli, Aghios Meletios, Nea Kypseli, Gyzi, Polygono, Ampelokipoi, Panormou-Gerokomeio, Pentagono, Ellinorosson, Nea Filothei, Ano Kypseli, Tourkovounia-Lofos Patatsou, Lofos Elikonos, Koliatsou, Thymarakia, Kato Patisia, Treis Gefyres, Aghios Eleftherios, Ano Patisia, Kypriadou, Menidi, Prompona, Aghios Panteleimonas, Pangrati, Goudi, Vyronas and Ilisia. Omonoia, Omonoia Square, () is the oldest square in Athens. It is surrounded by hotels and fast food outlets, and contains a metro station, named Omonia station. The square is the focus for celebration of sporting victories, as seen after the country's winning of the Euro 2004 and the EuroBasket 2005 tournaments. Metaxourgeio () is a neighborhood of Athens. The neighborhood is located north of the historical centre of Athens, between Kolonos to the east and Kerameikos to the west, and north of Gazi. Metaxourgeio is frequently described as a transition neighborhood. After a long period of abandonment in the late 20th century, the area is acquiring a reputation as an artistic and fashionable neighborhood following the opening of art galleries, museums, restaurants and cafés. [1] Local efforts to beautify and invigorate the neighborhood have reinforced a sense of community and artistic expression. Anonymous art pieces containing quotes and statements in both English and Ancient Greek have sprung up throughout the neighborhood, bearing statements such as "Art for art's sake" (Τέχνη τέχνης χάριν). Guerrilla gardening has also helped to beautify the area. Psiri – The reviving Psiri () neighbourhood – also known as Athens's "meat packing district" – is dotted with renovated former mansions, artists' spaces, and small gallery areas. A number of its renovated buildings also host fashionable bars, making it a hotspot for the city in the last decade, while live music restaurants known as "rebetadika", after rebetiko, a unique form of music that blossomed in Syros and Athens from the 1920s until the 1960s, are to be found. Rebetiko is admired by many, and as a result rebetadika are often crammed with people of all ages who will sing, dance and drink till dawn. The Gazi () area, one of the latest in full redevelopment, is located around a historic gas factory, now converted into the Technopolis cultural multiplex, and also includes artists' areas, small clubs, bars and restaurants, as well as Athens's "Gay village". The metro's expansion to the western suburbs of the city has brought easier access to the area since spring 2007, as the line 3 now stops at Gazi (Kerameikos station). Syntagma, Syntagma Square, (/Constitution Square), is the capital's central and largest square, lying adjacent to the Greek Parliament (the former Royal Palace) and the city's most notable hotels. Ermou Street, an approximately pedestrian road connecting Syntagma Square to Monastiraki, is a consumer paradise for both Athenians and tourists. Complete with fashion shops and shopping centres promoting most international brands, it now finds itself in the top five most expensive shopping streets in Europe, and the tenth most expensive retail street in the world. Nearby, the renovated Army Fund building in Panepistimiou Street includes the "Attica" department store and several upmarket designer stores. Plaka, Monastiraki, and Thission – Plaka (), lying just beneath the Acropolis, is famous for its plentiful neoclassical architecture, making up one of the most scenic districts of the city. It remains a prime tourist destination with tavernas, live performances and street salesmen. Nearby Monastiraki (), for its part, is known for its string of small shops and markets, as well as its crowded flea market and tavernas specialising in souvlaki. Another district known for its student-crammed, stylish cafés is Theseum or Thission (), lying just west of Monastiraki. Thission is home to the ancient Temple of Hephaestus, standing atop a small hill. This area also has a picturesque 11th-century Byzantine church, as well as a 15th-century Ottoman mosque. Exarcheia (), located north of Kolonaki, often regarded as the city's anarchist scene and as a student quarter with cafés, bars and bookshops. Exarcheia is home to the Athens Polytechnic and the National Archaeological Museum; it also contains important buildings of several 20th-century styles: Neoclassicism, Art Deco and Early Modernism (including Bauhaus influences). Kolonaki () is the area at the base of Lycabettus hill, full of boutiques catering to well-heeled customers by day, and bars and more fashionable restaurants by night, with galleries and museums. This is often regarded as one of the more prestigious areas of the capital. Parks and zoos Parnitha National Park is punctuated by well-marked paths, gorges, springs, torrents and caves dotting the protected area. Hiking and mountain-biking in all four mountains are popular outdoor activities for residents of the city. The National Garden of Athens was completed in 1840 and is a green refuge of 15.5 hectares in the centre of the Greek capital. It is to be found between the Parliament and Zappeion buildings, the latter of which maintains its own garden of seven hectares. Parts of the City Centre have been redeveloped under a masterplan called the Unification of Archeological Sites of Athens, which has also gathered funding from the EU to help enhance the project. The landmark Dionysiou Areopagitou Street has been pedestrianised, forming a scenic route. The route starts from the Temple of Olympian Zeus at Vasilissis Olgas Avenue, continues under the southern slopes of the Acropolis near Plaka, and finishes just beyond the Temple of Hephaestus in Thiseio. The route in its entirety provides visitors with views of the Parthenon and the Agora (the meeting point of ancient Athenians), away from the busy City Centre. The hills of Athens also provide green space. Lycabettus, Philopappos hill and the area around it, including Pnyx and Ardettos hill, are planted with pines and other trees, with the character of a small forest rather than typical metropolitan parkland. Also to be found is the Pedion tou Areos (Field of Mars) of 27.7 hectares, near the National Archaeological Museum. Athens' largest zoo is the Attica Zoological Park, a 20-hectare (49-acre) private zoo located in the suburb of Spata. The zoo is home to around 2000 animals representing 400 species, and is open 365 days a year. Smaller zoos exist within public gardens or parks, such as the zoo within the National Garden of Athens. Urban and suburban municipalities The Athens Metropolitan Area consists of 58 densely populated municipalities, sprawling around the Municipality of Athens (the City Centre) in virtually all directions. For the Athenians, all the urban municipalities surrounding the City Centre are called suburbs. According to their geographic location in relation to the City of Athens, the suburbs are divided into four zones; the northern suburbs (including Agios Stefanos, Dionysos, Ekali, Nea Erythraia, Kifissia, Kryoneri, Maroussi, Pefki, Lykovrysi, Metamorfosi, Nea Ionia, Nea Filadelfeia, Irakleio, Vrilissia, Melissia, Penteli, Chalandri, Agia Paraskevi, Gerakas, Pallini, Galatsi, Psychiko and Filothei); the southern suburbs (including Alimos, Nea Smyrni, Moschato, Tavros, Agios Ioannis Rentis, Kallithea, Piraeus, Agios Dimitrios, Palaio Faliro, Elliniko, Glyfada, Lagonisi, Saronida, Argyroupoli, Ilioupoli, Varkiza, Voula, Vari and Vouliagmeni); the eastern suburbs (including Zografou, Dafni, Vyronas, Kaisariani, Cholargos and Papagou); and the western suburbs (including Peristeri, Ilion, Egaleo, Koridallos, Agia Varvara, Keratsini, Perama, Nikaia, Drapetsona, Chaidari, Petroupoli, Agioi Anargyroi, Ano Liosia, Aspropyrgos, Eleusina, Acharnes and Kamatero). The Athens city coastline, extending from the major commercial port of Piraeus to the southernmost suburb of Varkiza for some , is also connected to the City Centre by tram. In the northern suburb of Maroussi, the upgraded main Olympic Complex (known by its Greek acronym OAKA) dominates the skyline. The area has been redeveloped according to a design by the Spanish architect Santiago Calatrava, with steel arches, landscaped gardens, fountains, futuristic glass, and a landmark new blue glass roof which was added to the main stadium. A second Olympic complex, next to the sea at the beach of Palaio Faliro, also features modern stadia, shops and an elevated esplanade. Work is underway to transform the grounds of the old Athens Airport – named Elliniko – in the southern suburbs, into one of the largest landscaped parks in Europe, to be named the Hellenikon Metropolitan Park. Many of the southern suburbs (such as Alimos, Palaio Faliro, Elliniko, Glyfada, Voula, Vouliagmeni and Varkiza) known as the Athens Riviera, host a number of sandy beaches, most of which are operated by the Greek National Tourism Organisation and require an entrance fee. Casinos operate on both Mount Parnitha, some from downtown Athens (accessible by car or cable car), and the nearby town of Loutraki (accessible by car via the Athens – Corinth National Highway, or the suburban rail service Proastiakos). Administration The large City Centre () of the Greek capital falls directly within the Municipality of Athens or Athens Municipality ()—also City of Athens. Athens Municipality is the largest in population size in Greece. Piraeus also forms a significant city centre on its own, within the Athens Urban Area and it is the second largest in population size within it, with Peristeri, Kallithea and Kypseli following. Athens Urban Area The Athens Urban Area (), also known as Urban Area of the Capital () or Greater Athens (), today consists of 40 municipalities, 35 of which make up what was referred to as the former Athens Prefecture municipalities, located within 4 regional units (North Athens, West Athens, Central Athens, South Athens); and a further 5 municipalities, which make up the former Piraeus Prefecture municipalities, located within the regional unit of Piraeus as mentioned above. The densely built up urban area of the Greek capital sprawls across throughout the Attica Basin and has a total population of 3,074,160 (in 2011). The Athens Municipality forms the core and center of Greater Athens, which in its turn consists of the Athens Municipality and 40 more municipalities, divided in four regional units (Central, North, South and West Athens), accounting for 2,641,511 people (in 2011) within an area of . Until 2010, which made up the abolished Athens Prefecture and the municipality of Piraeus, the historic Athenian port, with 4 other municipalities make up the regional unit of Piraeus. The regional units of Central Athens, North Athens, South Athens, West Athens and Piraeus with part of East and West Attica regional units combined make up the continuous Athens Urban Area, also called the "Urban Area of the Capital" or simply "Athens" (the most common use of the term), spanning over , with a population of 3,090,508 people as of 2011. The Athens Urban Area is considered to form the city of Athens as a whole, despite its administrative divisions, which is the largest in Greece and one of the most populated urban areas in Europe. Athens Metropolitan Area The Athens Metropolitan Area () spans within the Attica region and includes a total of 58 municipalities, which are organized in seven regional units (those outlined above, along with East Attica and West Attica), having reached a population of 3,737,550 based on the preliminary results of the 2011 census. Athens and Piraeus municipalities serve as the two metropolitan centres of the Athens Metropolitan Area. There are also some inter-municipal centres serving specific areas. For example, Kifissia and Glyfada serve as inter-municipal centres for northern and southern suburbs respectively. Demographics Population in modern times The Municipality of Athens has an official population of 664,046 people. The four regional units that make up what is referred to as Greater Athens have a combined population of 2,640,701. They together with the regional unit of Piraeus (Greater Piraeus) make up the dense Athens Urban Area which reaches a total population of 3,090,508 inhabitants (in 2011). According to Eurostat, in 2013 the functional urban area of Athens had 3,828,434 inhabitants, being apparently decreasing compared with the pre-economic crisis date of 2009 (4,164,175) The municipality (Center) of Athens is the most populous in Greece, with a population of 664,046 people (in 2011) and an area of , forming the core of the Athens Urban Area within the Attica Basin. The incumbent Mayor of Athens is Kostas Bakoyannis of New Democracy. The municipality is divided into seven municipal districts which are mainly used for administrative purposes. As of the 2011 census, the population for each of the seven municipal districts of Athens is as follows: 1st: 75,810 2nd: 103,004 3rd: 46,508 4th: 85,629 5th: 98,665 6th: 130,582 7th: 123,848 For the Athenians the most popular way of dividing the downtown is through its neighbourhoods such as Pagkrati, Ambelokipi, Goudi, Exarcheia, Patissia, Ilissia, Petralona, Plaka, Anafiotika, Koukaki, Kolonaki and Kypseli, each with its own distinct history and characteristics. Population of the Athens Metropolitan Area The Athens Metropolitan Area, with an area of and inhabited by 3,753,783 people in 2011, consists of the Athens Urban Area with the addition of the towns and villages of East and West Attica, which surround the dense urban area of the Greek capital. It actually sprawls over the whole peninsula of Attica, which is the best part of the region of Attica, excluding the islands. Population in ancient times Mycenean Athens in 1600–1100 BC could have equalled the size of Tiryns, with an estimated population of up to 10,000–15,000. During the Greek Dark Ages the population of Athens was around 4,000 people, rising to an estimated 10,000 by 700 BC. During the Classical period Athens denotes both the urban area of the city proper and its subject territory (the Athenian city-state) extending across most of the modern Attica region except the territory of the city-state of Megaris and the island section. In 500 BC the Athenian territory probably contained around 200,000 people. Thucydides indicates a 5th-century total of 150,000-350,000 and up to 610,000. A census ordered by Demetrius of Phalerum in 317 BC is said to have recorded 21,000 free citizens, 10,000 resident aliens and 400,000 slaves, a total population of 431,000, but this figure is highly suspect because of the improbably high number of slaves and does not include free women and children and resident foreigners. An estimate based on Thucydides is 40,000 male citizens, 100,000 family members, 70,000 metics (resident foreigners) and 150,000-400,000 slaves, though modern historians again hesitate to take such high numbers at face value, most estimates now preferring a total in the 200–350,000 range. The urban area of Athens proper (excluding the port of Piraeus) covered less than a thousandth of the area of the city-state, though its population density was of course far higher: modern estimates for the population of the built-up area tend to indicate around 35–45,000 inhabitants, though density of occupation, household size and whether there was a significant suburban population beyond the walls remain uncertain. The ancient site of the main city is centred on the rocky hill of the acropolis. In the whole of Athenian territory they existed many towns. Acharnae, Afidnes, Cytherus, Colonus, Corydallus, Cropia, Decelea, Euonymos, Vravron among others was important towns in Athenian countryside. The new port of Piraeus was a prototype harbour with the infrastructure and housing located in the site between modern passenger section of the port (named Kantharos in ancient times) and the Pasalimani harbour (named Zea in ancient times). The old one Phaliro was in the site of modern Palaio Faliro and gradually declined after the construction of the new prototype port but remained as a minor port and important settlement with historic significance in late Classical times. The rapid expansion of the modern city, which continues to this day, took off with industrial growth in the 1950s and 1960s. The expansion is now particularly toward the East and North East (a tendency greatly related to the new Eleftherios Venizelos International Airport and the Attiki Odos, the freeway that cuts across Attica). By this process Athens has engulfed many former suburbs and villages in Attica, and continues to do so. The table below shows the historical population of Athens in recent times. Government and politics Athens became the capital of Greece in 1834, following Nafplion, which was the provisional capital from 1829. The municipality (City) of Athens is also the capital of the Attica region. The term Athens can refer either to the Municipality of Athens, to Greater Athens or urban area, or to the entire Athens Metropolitan Area. International relations and influence Twin towns – sister cities Athens is twinned with: Partnerships Belgrade, Serbia (1966) Paris, France (2000) Ljubljana, Slovenia Naples, Italy Yerevan, Armenia (1993) Other locations named after Athens United States Canada Athens Township, Ontario (pop. 3,086) Costa Rica Atenas (pop. 7,716) Atenas (canton) (pop. 23,743) Germany Athenstedt, Saxony-Anhalt (pop. 431) Honduras Atenas De San Cristóbal, Atlántida Italy Atena Lucana, Province of Salerno, Campania (pop. 2,344) Atina, Province of Frosinone, Lazio (pop. 4,480) Poland Ateny, Podlaskie Voivodeship (pop. 40) Ukraine Afini (Zoria – Зоря), Donetsk (pop. 200) Economy and infrastructure Athens is the financial capital of Greece. According to data from 2014, Athens as a metropolitan economic area produced 130 billion US-dollars as GDP in PPP, which consists nearly a half of the production for the whole country. Athens was ranked 102nd in that year's list of global economic metropolises, while GDP per capita for the same year was 32,000 US-dollars. Athens is one of the major economic centres in south-eastern Europe and is considered a regional economic power. The port of Piraeus, where big investments by COSCO have already been delivered during the recent decade, the completion of the new Cargo Centre in Thriasion, the expansion of the Athens Metro and the Athens Tram, as well as the Hellenikon metropolitan park redevelopment in Elliniko and other urban projects, are the economic landmarks of the upcoming years. Prominent Greek companies such as Hellas Sat, Hellenic Aerospace Industry, Mytilineos Holdings, Titan Cement, Hellenic Petroleum, Papadopoulos E.J., Folli Follie, Jumbo S.A., OPAP, and Cosmote have their headquarters in the metropolitan area of Athens. Multinational companies such as Ericsson, Sony, Siemens, Motorola, Samsung, Microsoft, Novartis, Mondelez and Coca-Cola also have their regional research and development headquarters in the city. The banking sector is represented by National Bank of Greece, Alpha Bank, Eurobank, and Piraeus Bank, while the Bank of Greece is also situated in the City Centre. The Athens Stock Exchange was severely hit by the Greek government-debt crisis and the decision of the government to proceed into capital controls during summer 2015. As a whole the economy of Athens and Greece was strongly affected, while data showed a change from long recession to growth of 1.4% from 2017 onwards. Tourism is also a leading contributor to the economy of the city, as one of Europe's top destinations for city-break tourism, and also the gateway for excursions to both the islands and other parts of the mainland. Greece attracted 26.5 million visitors in 2015, 30.1 million visitors in 2017, and over 33 million in 2018, making Greece one of the most visited countries in Europe and the world, and contributing 18% to the country's GDP. Athens welcomed more than 5 million tourists in 2018, and 1.4 million were "city-breakers" ; this was an increase by over a million city-breakers since 2013. Transport Athens is the country's major transportation hub. The city has Greece's largest airport and its largest port ; Piraeus, too, is the largest container transport port in the Mediterranean, and the largest passenger port in Europe. Athens is a major national hub for Intercity (Ktel) and international buses, as well as for domestic and international rail transport. Public transport is serviced by a variety of transportation means, making up the country's largest mass transit system. The Athens Mass Transit System consists of a large bus and trolleybus fleet, the city's Metro, a commuter rail service and a tram network, connecting the southern suburbs to the city centre. Bus transport OSY () (Odikes Sygkoinonies S.A.), a subsidiary company of OASA (Athens urban transport organisation), is the main operator of buses and trolleybuses in Athens. As of 2017, its network consists of around 322 bus lines, spanning the Athens Metropolitan Area, and making up a fleet of 2,375 buses buses and trolleybuses. Of those 2,375, 619 buses run on compressed natural gas, making up the largest fleet of natural gas-powered buses in Europe, and 354 are electric-powered (trolleybuses). All of the 354 trolleybuses are equipped to run on diesel in case of power failure. International links are provided by a number of private companies. National and regional bus links are provided by KTEL from two InterCity Bus Terminals ; Kifissos Bus Terminal A and Liosion Bus Terminal B, both located in the north-western part of the city. Kifissos provides connections towards Peloponnese, North Greece, West Greece and some Ionian Islands, whereas Liosion is used for most of Central Greece. Athens Metro The Athens Metro is

quality in Athens all year round. Damage to the park has led to worries over a stalling in the improvement of air quality in the city. The major waste management efforts undertaken in the last decade (particularly the plant built on the small island of Psytalia) have greatly improved water quality in the Saronic Gulf, and the coastal waters of Athens are now accessible again to swimmers. Safety Athens ranks in the lowest percentage for the risk on frequency and severity of terrorist attacks according to the EU Global Terrorism Database (EIU 2007–2016 calculations). The city also ranked 35th in Digital Security, 21st on Health Security, 29th on Infrastructure Security and 41st on Personal Security globally in a 2017 The Economist Intelligence Unit report. It also ranks as a very safe city (39th globally out of 162 cities overall) on the ranking of the safest and most dangerous countries. A 2019 crime index from Numbeo places Athens at 130th position, rating safer than Tampa, Florida or Dublin, Ireland. According to a Mercer 2019 Quality of Living Survey, Athens ranks 89th on the Mercer Quality of Living Survey ranking. Climate Athens has a hot-summer Mediterranean climate (Köppen climate classification: Csa). The dominant feature of Athens' climate is alternation between prolonged hot and dry summers because of the dry and hot winds blowing from the Sahara, and mild, wetter winters with moderate rainfall, due to the westerly winds. With an average of of yearly precipitation, rainfall occurs largely between the months of October and April. July and August are the driest months when thunderstorms occur sparsely. Furthermore, some coastal areas such as Piraeus in the Athens Riviera, have a hot semi-arid climate (BSh) according to the climate atlas published by the Hellenic National Meteorological Service. However, places like Elliniko, which are classified as hot semi-arid (BSh) because of the low annual rainfall, have not recorded temperatures as high as other places in the city. This occurs due to the moderating influence of the sea, and lower levels of industrialisation compared to other regions of the city. Owing to the rain shadow of the Pindus Mountains, annual precipitation of Athens is lower than most other parts of Greece, especially western Greece. As an example, Ioannina receives around per year, and Agrinio around per year. Daily average highs for July have been measured around in downtown Athens, but some parts of the city may be even hotter for the higher density of buildings, and the lower density of vegetation, such as the center, in particular, western areas due to a combination of industrialization and a number of natural factors, knowledge of which has existed since the mid-19th century. Due to the large area covered by Athens Metropolitan Area, there are notable climatic differences between parts of the urban conglomeration. The northern suburbs tend to be wetter and cooler in winter, whereas the southern suburbs are some of the driest locations in Greece and record very high minimum temperatures in summer. Heavy snowfall is not infrequent. Heavy snow fell in the Greater Athens area and Athens itself between 14–17 February 2021, when snow blanketed the entire city and its suburbs from the north to the furthest south, coastal suburbs, with depth ranges up to in Central Athens., and with even the Acropolis of Athens completely covered with snow. The National Meteorological Service (EMY) described it was one of the most intense snow storms over the past 40 years. Heavy snow was also reported in Athens on January 24, 2022, with reported locally in the higher elevations. Athens is affected by the urban heat island effect in some areas which is caused by human activity, altering its temperatures compared to the surrounding rural areas, and leaving detrimental effects on energy usage, expenditure for cooling, and health. The urban heat island of the city has also been found to be partially responsible for alterations of the climatological temperature time-series of specific Athens meteorological stations, because of its impact on the temperatures and the temperature trends recorded by some meteorological stations. On the other hand, specific meteorological stations, such as the National Garden station and Thiseio meteorological station, are less affected or do not experience the urban heat island. Athens holds the World Meteorological Organization record for the highest temperature ever recorded in Europe, at , which was recorded in the Elefsina and Tatoi suburbs of Athens on 10 July 1977. Locations Neighbourhoods of the center of Athens (Municipality of Athens) The Municipality of Athens, the City Centre of the Athens Urban Area, is divided into several districts: Omonoia, Syntagma, Exarcheia, Agios Nikolaos, Neapolis, Lykavittos, Lofos Strefi, Lofos Finopoulou, Lofos Filopappou, Pedion Areos, Metaxourgeio, Aghios Kostantinos, Larissa Station, Kerameikos, Psiri, Monastiraki, Gazi, Thission, Kapnikarea, Aghia Irini, Aerides, Anafiotika, Plaka, Acropolis, Pnyka, Makrygianni, Lofos Ardittou, Zappeion, Aghios Spyridon, Pangrati, Kolonaki, Dexameni, Evaggelismos, Gouva, Aghios Ioannis, Neos Kosmos, Koukaki, Kynosargous, Fix, Ano Petralona, Kato Petralona, Rouf, Votanikos, Profitis Daniil, Akadimia Platonos, Kolonos, Kolokynthou, Attikis Square, Lofos Skouze, Sepolia, Kypseli, Aghios Meletios, Nea Kypseli, Gyzi, Polygono, Ampelokipoi, Panormou-Gerokomeio, Pentagono, Ellinorosson, Nea Filothei, Ano Kypseli, Tourkovounia-Lofos Patatsou, Lofos Elikonos, Koliatsou, Thymarakia, Kato Patisia, Treis Gefyres, Aghios Eleftherios, Ano Patisia, Kypriadou, Menidi, Prompona, Aghios Panteleimonas, Pangrati, Goudi, Vyronas and Ilisia. Omonoia, Omonoia Square, () is the oldest square in Athens. It is surrounded by hotels and fast food outlets, and contains a metro station, named Omonia station. The square is the focus for celebration of sporting victories, as seen after the country's winning of the Euro 2004 and the EuroBasket 2005 tournaments. Metaxourgeio () is a neighborhood of Athens. The neighborhood is located north of the historical centre of Athens, between Kolonos to the east and Kerameikos to the west, and north of Gazi. Metaxourgeio is frequently described as a transition neighborhood. After a long period of abandonment in the late 20th century, the area is acquiring a reputation as an artistic and fashionable neighborhood following the opening of art galleries, museums, restaurants and cafés. [1] Local efforts to beautify and invigorate the neighborhood have reinforced a sense of community and artistic expression. Anonymous art pieces containing quotes and statements in both English and Ancient Greek have sprung up throughout the neighborhood, bearing statements such as "Art for art's sake" (Τέχνη τέχνης χάριν). Guerrilla gardening has also helped to beautify the area. Psiri – The reviving Psiri () neighbourhood – also known as Athens's "meat packing district" – is dotted with renovated former mansions, artists' spaces, and small gallery areas. A number of its renovated buildings also host fashionable bars, making it a hotspot for the city in the last decade, while live music restaurants known as "rebetadika", after rebetiko, a unique form of music that blossomed in Syros and Athens from the 1920s until the 1960s, are to be found. Rebetiko is admired by many, and as a result rebetadika are often crammed with people of all ages who will sing, dance and drink till dawn. The Gazi () area, one of the latest in full redevelopment, is located around a historic gas factory, now converted into the Technopolis cultural multiplex, and also includes artists' areas, small clubs, bars and restaurants, as well as Athens's "Gay village". The metro's expansion to the western suburbs of the city has brought easier access to the area since spring 2007, as the line 3 now stops at Gazi (Kerameikos station). Syntagma, Syntagma Square, (/Constitution Square), is the capital's central and largest square, lying adjacent to the Greek Parliament (the former Royal Palace) and the city's most notable hotels. Ermou Street, an approximately pedestrian road connecting Syntagma Square to Monastiraki, is a consumer paradise for both Athenians and tourists. Complete with fashion shops and shopping centres promoting most international brands, it now finds itself in the top five most expensive shopping streets in Europe, and the tenth most expensive retail street in the world. Nearby, the renovated Army Fund building in Panepistimiou Street includes the "Attica" department store and several upmarket designer stores. Plaka, Monastiraki, and Thission – Plaka (), lying just beneath the Acropolis, is famous for its plentiful neoclassical architecture, making up one of the most scenic districts of the city. It remains a prime tourist destination with tavernas, live performances and street salesmen. Nearby Monastiraki (), for its part, is known for its string of small shops and markets, as well as its crowded flea market and tavernas specialising in souvlaki. Another district known for its student-crammed, stylish cafés is Theseum or Thission (), lying just west of Monastiraki. Thission is home to the ancient Temple of Hephaestus, standing atop a small hill. This area also has a picturesque 11th-century Byzantine church, as well as a 15th-century Ottoman mosque. Exarcheia (), located north of Kolonaki, often regarded as the city's anarchist scene and as a student quarter with cafés, bars and bookshops. Exarcheia is home to the Athens Polytechnic and the National Archaeological Museum; it also contains important buildings of several 20th-century styles: Neoclassicism, Art Deco and Early Modernism (including Bauhaus influences). Kolonaki () is the area at the base of Lycabettus hill, full of boutiques catering to well-heeled customers by day, and bars and more fashionable restaurants by night, with galleries and museums. This is often regarded as one of the more prestigious areas of the capital. Parks and zoos Parnitha National Park is punctuated by well-marked paths, gorges, springs, torrents and caves dotting the protected area. Hiking and mountain-biking in all four mountains are popular outdoor activities for residents of the city. The National Garden of Athens was completed in 1840 and is a green refuge of 15.5 hectares in the centre of the Greek capital. It is to be found between the Parliament and Zappeion buildings, the latter of which maintains its own garden of seven hectares. Parts of the City Centre have been redeveloped under a masterplan called the Unification of Archeological Sites of Athens, which has also gathered funding from the EU to help enhance the project. The landmark Dionysiou Areopagitou Street has been pedestrianised, forming a scenic route. The route starts from the Temple of Olympian Zeus at Vasilissis Olgas Avenue, continues under the southern slopes of the Acropolis near Plaka, and finishes just beyond the Temple of Hephaestus in Thiseio. The route in its entirety provides visitors with views of the Parthenon and the Agora (the meeting point of ancient Athenians), away from the busy City Centre. The hills of Athens also provide green space. Lycabettus, Philopappos hill and the area around it, including Pnyx and Ardettos hill, are planted with pines and other trees, with the character of a small forest rather than typical metropolitan parkland. Also to be found is the Pedion tou Areos (Field of Mars) of 27.7 hectares, near the National Archaeological Museum. Athens' largest zoo is the Attica Zoological Park, a 20-hectare (49-acre) private zoo located in the suburb of Spata. The zoo is home to around 2000 animals representing 400 species, and is open 365 days a year. Smaller zoos exist within public gardens or parks, such as the zoo within the National Garden of Athens. Urban and suburban municipalities The Athens Metropolitan Area consists of 58 densely populated municipalities, sprawling around the Municipality of Athens (the City Centre) in virtually all directions. For the Athenians, all the urban municipalities surrounding the City Centre are called suburbs. According to their geographic location in relation to the City of Athens, the suburbs are divided into four zones; the northern suburbs (including Agios Stefanos, Dionysos, Ekali, Nea Erythraia, Kifissia, Kryoneri, Maroussi, Pefki, Lykovrysi, Metamorfosi, Nea Ionia, Nea Filadelfeia, Irakleio, Vrilissia, Melissia, Penteli, Chalandri, Agia Paraskevi, Gerakas, Pallini, Galatsi, Psychiko and Filothei); the southern suburbs (including Alimos, Nea Smyrni, Moschato, Tavros, Agios Ioannis Rentis, Kallithea, Piraeus, Agios Dimitrios, Palaio Faliro, Elliniko, Glyfada, Lagonisi, Saronida, Argyroupoli, Ilioupoli, Varkiza, Voula, Vari and Vouliagmeni); the eastern suburbs (including Zografou, Dafni, Vyronas, Kaisariani, Cholargos and Papagou); and the western suburbs (including Peristeri, Ilion, Egaleo, Koridallos, Agia Varvara, Keratsini, Perama, Nikaia, Drapetsona, Chaidari, Petroupoli, Agioi Anargyroi, Ano Liosia, Aspropyrgos, Eleusina, Acharnes and Kamatero). The Athens city coastline, extending from the major commercial port of Piraeus to the southernmost suburb of Varkiza for some , is also connected to the City Centre by tram. In the northern suburb of Maroussi, the upgraded main Olympic Complex (known by its Greek acronym OAKA) dominates the skyline. The area has been redeveloped according to a design by the Spanish architect Santiago Calatrava, with steel arches, landscaped gardens, fountains, futuristic glass, and a landmark new blue glass roof which was added to the main stadium. A second Olympic complex, next to the sea at the beach of Palaio Faliro, also features modern stadia, shops and an elevated esplanade. Work is underway to transform the grounds of the old Athens Airport – named Elliniko – in the southern suburbs, into one of the largest landscaped parks in Europe, to be named the Hellenikon Metropolitan Park. Many of the southern suburbs (such as Alimos, Palaio Faliro, Elliniko, Glyfada, Voula, Vouliagmeni and Varkiza) known as the Athens Riviera, host a number of sandy beaches, most of which are operated by the Greek National Tourism Organisation and require an entrance fee. Casinos operate on both Mount Parnitha, some from downtown Athens (accessible by car or cable car), and the nearby town of Loutraki (accessible by car via the Athens – Corinth National Highway, or the suburban rail service Proastiakos). Administration The large City Centre () of the Greek capital falls directly within the Municipality of Athens or Athens Municipality ()—also City of Athens. Athens Municipality is the largest in population size in Greece. Piraeus also forms a significant city centre on its own, within the Athens Urban Area and it is the second largest in population size within it, with Peristeri, Kallithea and Kypseli following. Athens Urban Area The Athens Urban Area (), also known as Urban Area of the Capital () or Greater Athens (), today consists of 40 municipalities, 35 of which make up what was referred to as the former Athens Prefecture municipalities, located within 4 regional units (North Athens, West Athens, Central Athens, South Athens); and a further 5 municipalities, which make up the former Piraeus Prefecture municipalities, located within the regional unit of Piraeus as mentioned above. The densely built up urban area of the Greek capital sprawls across throughout the Attica Basin and has a total population of 3,074,160 (in 2011). The Athens Municipality forms the core and center of Greater Athens, which in its turn consists of the Athens Municipality and 40 more municipalities, divided in four regional units (Central, North, South and West Athens), accounting for 2,641,511 people (in 2011) within an area of . Until 2010, which made up the abolished Athens Prefecture and the municipality of Piraeus, the historic Athenian port, with 4 other municipalities make up the regional unit of Piraeus. The regional units of Central Athens, North Athens, South Athens, West Athens and Piraeus with part of East and West Attica regional units combined make up the continuous Athens Urban Area, also called the "Urban Area of the Capital" or simply "Athens" (the most common use of the term), spanning over , with a population of 3,090,508 people as of 2011. The Athens Urban Area is considered to form the city of Athens as a whole, despite its administrative divisions, which is the largest in Greece and one of the most populated urban areas in Europe. Athens Metropolitan Area The Athens Metropolitan Area () spans within the Attica region and includes a total of 58 municipalities, which are organized in seven regional units (those outlined above, along with East Attica and West Attica), having reached a population of 3,737,550 based on the preliminary results of the 2011 census. Athens and Piraeus municipalities serve as the two metropolitan centres of the Athens Metropolitan Area. There are also some inter-municipal centres serving specific areas. For example, Kifissia and Glyfada serve as inter-municipal centres for northern and southern suburbs respectively. Demographics Population in modern times The Municipality of Athens has an official population of 664,046 people. The four regional units that make up what is referred to as Greater Athens have a combined population of 2,640,701. They together with the regional unit of Piraeus (Greater Piraeus) make up the dense Athens Urban Area which reaches a total population of 3,090,508 inhabitants (in 2011). According to Eurostat, in 2013 the functional urban area of Athens had 3,828,434 inhabitants, being apparently decreasing compared with the pre-economic crisis date of 2009 (4,164,175) The municipality (Center) of Athens is the most populous in Greece, with a population of 664,046 people (in 2011) and an area of , forming the core of the Athens Urban Area within the Attica Basin. The incumbent Mayor of Athens is Kostas Bakoyannis of New Democracy. The municipality is divided into seven municipal districts which are mainly used for administrative purposes. As of the 2011 census, the population for each of the seven municipal districts of Athens is as follows: 1st: 75,810 2nd: 103,004 3rd: 46,508 4th: 85,629 5th: 98,665 6th: 130,582 7th: 123,848 For the Athenians the most popular way of dividing the downtown is through its neighbourhoods such as Pagkrati, Ambelokipi, Goudi, Exarcheia, Patissia, Ilissia, Petralona, Plaka, Anafiotika, Koukaki, Kolonaki and Kypseli, each with its own distinct history and characteristics. Population of the Athens Metropolitan Area The Athens Metropolitan Area, with an area of and inhabited by 3,753,783 people in 2011, consists of the Athens Urban Area with the addition of the towns and villages of East and West Attica, which surround the dense urban area of the Greek capital. It actually sprawls over the whole peninsula of Attica, which is the best part of the region of Attica, excluding the islands. Population in ancient times Mycenean Athens in 1600–1100 BC could have equalled the size of Tiryns, with an estimated population of up to 10,000–15,000. During the Greek Dark Ages the population of Athens was around 4,000 people, rising to an estimated 10,000 by 700 BC. During the Classical period Athens denotes both the urban area of the city proper and its subject territory (the Athenian city-state) extending across most of the modern Attica region except the territory of the city-state of Megaris and the island section. In 500 BC the Athenian territory probably contained around 200,000 people. Thucydides indicates a 5th-century total of 150,000-350,000 and up to 610,000. A census ordered by Demetrius of Phalerum in 317 BC is said to have recorded 21,000 free citizens, 10,000 resident aliens and 400,000 slaves, a total population of 431,000, but this figure is highly suspect because of the improbably high number of slaves and does not include free women and children and resident foreigners. An estimate based on Thucydides is 40,000 male citizens, 100,000 family members, 70,000 metics (resident foreigners) and 150,000-400,000 slaves, though modern historians again hesitate to take such high numbers at face value, most estimates now preferring a total in the 200–350,000 range. The urban area of Athens proper (excluding the port of Piraeus) covered less than a thousandth of the area of the city-state, though its population density was of course far higher: modern estimates for the population of the built-up area tend to indicate around 35–45,000 inhabitants, though density of occupation, household size and whether there was a significant suburban population beyond the walls remain uncertain. The ancient site of the main city is centred on the rocky hill of the acropolis. In the whole of Athenian territory they existed many towns. Acharnae, Afidnes, Cytherus, Colonus, Corydallus, Cropia, Decelea, Euonymos, Vravron among others was important towns in Athenian countryside. The new port of Piraeus was a prototype harbour with the infrastructure and housing located in the site between modern passenger section of the port (named Kantharos in ancient times) and the Pasalimani harbour (named Zea in ancient times). The old one Phaliro was in the site of modern Palaio Faliro and gradually declined after the construction of the new prototype port but remained as a minor port and important settlement with historic significance in late Classical times. The rapid expansion of the modern city, which continues to this day, took off with industrial growth in the 1950s and 1960s. The expansion is now particularly toward the East and North East (a tendency greatly related to the new Eleftherios Venizelos International Airport and the Attiki Odos, the freeway that cuts across Attica). By this process Athens has engulfed many former suburbs and villages in Attica, and continues to do so. The table below shows the historical population of Athens in recent times. Government and politics Athens became the capital of Greece in 1834, following Nafplion, which was the provisional capital from 1829. The municipality (City) of Athens is also the capital of the Attica region. The term Athens can refer either to the Municipality of Athens, to Greater Athens or urban area, or to the entire Athens Metropolitan Area. International relations and influence Twin towns – sister cities Athens is twinned with: Partnerships Belgrade, Serbia (1966) Paris, France (2000) Ljubljana, Slovenia Naples, Italy Yerevan, Armenia (1993) Other locations named after Athens United States Canada Athens Township, Ontario (pop. 3,086) Costa Rica Atenas (pop. 7,716) Atenas (canton) (pop. 23,743) Germany Athenstedt, Saxony-Anhalt (pop. 431) Honduras Atenas De San Cristóbal, Atlántida Italy Atena Lucana, Province of Salerno, Campania (pop. 2,344) Atina, Province of Frosinone, Lazio (pop. 4,480) Poland Ateny, Podlaskie Voivodeship (pop. 40) Ukraine Afini (Zoria – Зоря), Donetsk (pop. 200) Economy and infrastructure Athens is the financial capital of Greece. According to data from 2014, Athens as a metropolitan economic area produced 130 billion US-dollars as GDP in PPP, which consists nearly a half of the production for the whole country. Athens was ranked 102nd in that year's list of global economic metropolises, while GDP per capita for the same year was 32,000 US-dollars. Athens is one of the major economic centres in south-eastern Europe and is considered a regional economic power. The port of Piraeus, where big investments by COSCO have already been delivered during the recent decade, the completion of the new Cargo Centre in Thriasion, the expansion of the Athens Metro and the Athens Tram, as well as the Hellenikon metropolitan park redevelopment in Elliniko and other urban projects, are the economic landmarks of the upcoming years. Prominent Greek companies such as Hellas Sat, Hellenic Aerospace Industry, Mytilineos Holdings, Titan Cement, Hellenic Petroleum, Papadopoulos E.J., Folli Follie, Jumbo S.A., OPAP, and Cosmote have their headquarters in the metropolitan area of Athens. Multinational companies such as Ericsson, Sony, Siemens, Motorola, Samsung, Microsoft, Novartis, Mondelez and Coca-Cola also have their regional research and development headquarters in the city. The banking sector is represented by National Bank of Greece, Alpha Bank, Eurobank, and Piraeus Bank, while the Bank of Greece is also situated in the City Centre. The Athens Stock Exchange was severely hit by the Greek government-debt crisis and the decision of the government to proceed into capital controls during summer 2015. As a whole the economy of Athens and Greece was strongly affected, while data showed a change from long recession to growth of 1.4% from 2017 onwards. Tourism is also a leading contributor to the economy of the city, as one of Europe's top destinations for city-break tourism, and also the gateway for excursions to both the islands and other parts of the mainland. Greece attracted 26.5 million visitors in 2015, 30.1 million visitors in 2017, and over 33 million in 2018, making Greece one of the most visited countries in Europe and the world, and contributing 18% to the country's GDP. Athens welcomed more than 5 million tourists in 2018, and 1.4 million were "city-breakers" ; this was an increase by over a million city-breakers since 2013. Transport Athens is the country's major transportation hub. The city has Greece's largest airport and its largest port ; Piraeus, too, is the largest container transport port in the Mediterranean, and the largest passenger port in Europe. Athens is a major national hub for Intercity (Ktel) and international buses, as well as for domestic and international rail transport. Public transport is serviced by a variety of transportation means, making up the country's largest mass transit system. The Athens Mass Transit System consists of a large bus and trolleybus fleet, the city's Metro, a commuter rail service and a tram network, connecting the southern suburbs to the city centre. Bus transport OSY () (Odikes Sygkoinonies S.A.), a subsidiary company of OASA (Athens urban transport organisation), is the main operator of buses and trolleybuses in Athens. As of 2017, its network consists of around 322 bus lines, spanning the Athens Metropolitan Area, and making up a fleet of 2,375 buses buses and trolleybuses. Of those 2,375, 619 buses run on compressed natural gas, making up the largest fleet of natural gas-powered buses in Europe, and 354 are electric-powered (trolleybuses). All of the 354 trolleybuses are equipped to run on diesel in case of power failure. International links are provided by a number of private companies. National and regional bus links are provided by KTEL from two InterCity Bus Terminals ; Kifissos Bus Terminal A and Liosion Bus Terminal B, both located in the north-western part of the city. Kifissos provides connections towards Peloponnese, North Greece, West Greece and some Ionian Islands, whereas Liosion is used for most of Central Greece. Athens Metro The Athens Metro is operated by STASY S.A () (Statheres Sygkoinonies S.A), a subsidiary company of OASA (Athens urban transport organisation), which provides public transport throughout the Athens Urban Area. While its main purpose is transport, it also houses Greek artifacts found during construction of the system. The Athens Metro runs three metro lines, namely Line 1 (Green Line), Line 2 (Red Line) and Line 3 (Blue Line) lines, of which the first was constructed in 1869, and the other two largely during the 1990s, with the initial new sections opened in January 2000. Line 1 mostly runs at ground level and the other two (Line 2 & 3) routes run entirely underground. A fleet of 42 trains, using 252 carriages, operates on the network, with a daily occupancy of 1,353,000 passengers. Line 1 (Green Line) serves 24 stations, and is the oldest line of the Athens metro network. It runs from Piraeus station to Kifissia station and covers a distance of . There are transfer connections with the Blue Line 3 at Monastiraki station and with the Red Line 2 at Omonia and Attiki stations. Line 2 (Red Line) runs from Anthoupoli station to Elliniko station and covers a distance of {{convert|17.5|km|1|abbr=on}i}. The line connects the western suburbs of Athens with the southeast suburbs, passing through the center of Athens. The Red Line has transfer connections with the Green Line 1 at Attiki and Omonia stations. There are also transfer connections with the Blue Line 3 at Syntagma station and with the tram at Syntagma, Syngrou Fix and Neos Kosmos stations. Line 3 (Blue Line) runs from Nikaia station, through the central Monastiraki and Syntagma stations to Doukissis Plakentias avenue in the northeastern suburb of Halandri. It then ascends to ground level and continues to Athens International Airport Eleftherios Venizelos using the suburban railway infrastructure, extending its total length to . The spring 2007 extension from Monastiraki westwards to Egaleo connected some of the main night life hubs of the city, namely those of Gazi (Kerameikos station) with Psirri (Monastiraki station) and the city centre (Syntagma station). Extensions are under construction to the western and southwestern suburbs of Athens, as far as the Port of Piraeus. The new stations will be Maniatika, Piraeus and Dimotiko Theatro, and the completed extension will be ready in 2022, connecting the biggest port of Greece, the Port of Piraeus, with Athens International Airport, the biggest airport of Greece. Commuter/suburban rail (Proastiakos) The Athens commuter rail service, referred to as the "Proastiakós", connects Athens International Airport to the city of Kiato, west of Athens, via Larissa station, the city's central rail station and the port of Piraeus. The length of Athens's commuter rail network extends to , and is expected to stretch to by 2010. Tram The Athens Tram is operated by STASY S.A (Statheres Sygkoinonies S.A), a subsidiary company of OASA (Athens urban transport organisation). It has a fleet of 35 Sirio type vehicles which serve 48 stations, employ 345 people with an average daily occupancy of 65,000 passengers. The tram network spans a total length of and covers ten Athenian suburbs. The network runs from Syntagma Square to the southwestern suburb of Palaio Faliro, where the line splits in two branches; the first runs along the Athens coastline toward the southern suburb of Voula, while the other heads toward Neo Faliro. The network covers the majority of the Athens coastline. Further extension is under construction towards the major commercial port of Piraeus. The expansion to Piraeus will include 12 new stations, increase the overall length of tram route by , and increase the overall transportation network. Athens International Airport Athens is served by the Athens International Airport (ATH), located near the town of Spata, in the eastern Messoghia plain, some east of center of Athens. The airport, awarded the "European Airport of the Year 2004" Award, is intended as an expandable hub for air travel in southeastern Europe and was constructed in 51 months, costing 2.2 billion euros. It employs a staff of 14,000. The airport is served by the Metro, the suburban rail, buses to Piraeus port, Athens' City Centre, Liosion and Kifisos Intercity bus stations and Elliniko metro's line 2 southern terminal, and also taxis. The airport accommodates 65 landings and take-offs per hour, with its 24-passenger boarding bridges, 144 check-in counters and broader main terminal; and a commercial area of which includes cafés, duty-free shops, and a small museum. In 2018, the airport handled 24,135,736 passengers, a huge increase over the last 4 years. In 2014, the airport handled 15,196,369 passengers, an increase of 21.2% over the previous year of 2013. Of those 15,196,369 passengers, 5,267,593 passed through the airport for domestic flights, and 9,970,006 passengers travelled through for international flights. Beyond the dimensions of its passenger capacity, ATH handled 205,294 total flights in 2007, or approximately 562 flights per day. Railways and ferry connections Athens is the hub of the country's national railway system (OSE), connecting the capital with major cities across Greece and abroad (Istanbul, Sofia, Belgrade and Bucharest). The Port of Piraeus is the largest port in Greece and one of the largest in Europe. Rafina and Lavrio act as alternative ports of Athens, connects the city with numerous Greek islands of the Aegean Sea, Evia and Cesme in Turkey, while also serving the cruise ships that arrive. Motorways Two main motorways of Greece begin in Athens, namely the A1/E75, heading north towards Greece's second largest city, Thessaloniki; and the border crossing of Evzones and the A8/E94 heading west, towards Greece's third largest city, Patras, which incorporated the GR-8A. Before their completion much of the road traffic used the GR-1 and the GR-8. Athens' Metropolitan Area is served by the motorway network of the Attiki Odos toll-motorway (code: A6). Its main section extends from the western industrial suburb of Elefsina to Athens International Airport; while two beltways, namely the Aigaleo Beltway (A65) and the Hymettus Beltway (A64) serve parts of western and eastern Athens respectively. The span of the Attiki Odos in all its length is , making it the largest metropolitan motorway network in all of Greece. Motorways: A1/E75 N (Lamia, Larissa, Thessaloniki) A8 (GR-8A)/E94 W

British through Antigua; in 1825, it was placed under the administrative control of nearby Saint Kitts. Anguilla was federated with St Kitts and Nevis in 1882, against the wishes of many Anguillans. Economic stagnation, and the severe effects of several droughts in the 1890s and later the Great Depression of the 1930s led many Anguillans to emigrate for better prospects elsewhere. Full adult suffrage was introduced to Anguilla in 1952. After a brief period as part of the West Indies Federation (1958–62), the island of Anguilla became part of the associated state of Saint Kitts-Nevis-Anguilla with full internal autonomy in 1967. However many Anguillans had no wish to be a part of this union, and resented the dominance of St Kitts within it. On 30 May 1967 Anguillans forcibly ejected the St Kitts police force from the island and declared their separation from St Kitts following a referendum. The events, led by Atlin Harrigan and Ronald Webster among others, became known as the Anguillan Revolution; its goal was not independence per se, but rather independence from Saint Kitts and Nevis and a return to being a British colony. With negotiations failing to break the deadlock, a second referendum confirming Anguillans' desire for separation from St Kitts was held and the Republic of Anguilla was declared unilaterally, with Ronald Webster as president. Efforts by British envoy William Whitlock failed to break the impasse and 300 British troops were subsequently sent in March 1969. British authority was restored, and confirmed by the Anguilla Act of July 1971. In 1980, Anguilla was finally allowed to formally secede from Saint Kitts and Nevis and become a separate British Crown colony (now a British overseas territory). Since then, Anguilla has been politically stable, and has seen a large growth in its tourism and offshore financing sectors. Geography and geology Anguilla is a flat, low-lying island of coral and limestone in the Caribbean Sea, measuring some 16 miles (26 km) long and 3.5 miles (6 km) in width. It lies to the east of Puerto Rico and the Virgin Islands and directly north of Saint Martin, separated from that island by the Anguilla Channel. The soil is generally thin and poor, supporting scrub, tropical and forest vegetation. The terrain is generally low-lying, with the highest terrain located in the vicinity of The Valley; Crocus Hill, Anguilla's highest peak at , lies in the western regions of the town. Anguilla is noted for its ecologically important coral reefs and beaches. Apart from the main island of Anguilla itself, the territory includes a number of other smaller islands and cays, mostly tiny and uninhabited: Anguillita Blowing Rock Dog Island Little Scrub Island Prickly Pear Cays Scrub Island Seal Island Sombrero, also known as Hat Island Sandy Island Scilly Cay Geology Anguilla has a volcanic origin and has been submerged repeatedly from climate change. Climate Temperature Northeastern trade winds keep this tropical island relatively cool and dry. Average annual temperature is . July–October is its hottest period, December–February, its coolest. Rainfall Rainfall averages annually, although the figures vary from season to season and year to year. The island is subject to both sudden tropical storms and hurricanes, which occur in the period from July to November. The island suffered damage in 1995 from Hurricane Luis and severe flooding from Hurricane Lenny. Governance Political system Anguilla is an internally self-governing overseas territory of the United Kingdom. Its politics take place in a framework of a parliamentary representative democratic dependency, whereby the Premier is the head of government, and of a pluriform multi-party system. The United Nations Committee on Decolonization includes Anguilla on the United Nations list of Non-Self-Governing Territories. The territory's constitution is the Anguilla Constitutional Order 1 April 1982 (amended 1990). Executive power is exercised by the government, with legislative power being vested in both the government and the House of Assembly. The judiciary is independent of the executive and the legislature. Defence As a British overseas territory, the UK is responsible for Anguilla's military defence, although there are no active garrisons or armed forces present. Anguilla has a small marine police force, comprising around 32 personnel, which operates one VT Halmatic M160-class 52-foot fast patrol boat. Policing on the island is the responsibility of the Royal Anguilla Police Force. Population Demographics The majority of residents (90.08%) are black, most of whom are the descendants of enslaved people transported from Africa. Minorities include whites at 3.74% and people of mixed race at 4.65% (figures from 2001 census). 72% of the population is Anguillan while 28% is non-Anguillan (2001 census). Of the non-Anguillan population, many are citizens of the United States, United Kingdom, St Kitts & Nevis, the Dominican Republic, Jamaica and Nigeria. 2006 and 2007 saw an influx of large numbers of Chinese, Indian and Mexican workers, brought in as labour for major tourist developments due to the local population not being large enough to support the labour requirements. Religion Christian churches did not have a consistent or strong presence during the initial period of English colonisation; spiritual and religious practices of Europeans and Africans tended to reflect their regional origins. As early as 1813, Christian ministers formally ministered to enslaved Africans and promoted literacy among converts. The Wesleyan (Methodist) Missionary Society of England built churches and schools from 1817. According to the 2001 census, Christianity is Anguilla's predominant religion, with 29% of the population practising Anglicanism; another 23.9% are Methodist. Other churches on the island include Seventh-day Adventist, Baptist, Roman Catholic (served by the Diocese of Saint John's–Basseterre, with the See at Saint John on Antigua and Barbuda) and a small community of Jehovah's Witnesses (0.7%). Between 1992 and 2001, the number of followers of the Church of God and Pentecostals increased considerably. There are at least 15 churches on the island. Although a minority on the island, Anguilla is an important location to followers of Rastafarian religion as the birthplace of Robert Athlyi Rogers, author of the Holy Piby which had a strong influence on Rastafarian and other Africa-centre belief systems. More recently, a Muslim cultural centre has opened on the island. Languages Today most people in Anguilla speak a British-influenced variety of standard English. Other languages are also spoken on the island, including varieties of Spanish, Chinese and the languages of other immigrant communities. However, the most common language other than Standard English is the island's own English-lexifier Creole language (not to be confused with Antillean Creole ('French Creole'), spoken in French islands such as Martinique and Guadeloupe). It is referred to locally by terms such as "dialect" (pronounced "dialek"), Anguilla Talk or "Anguillian". It has its main roots in early varieties of English and West African languages, and is similar to the dialects spoken in English-speaking islands throughout the Eastern Caribbean in terms of its structural features. Linguists who are interested in the origins of Anguillan and other Caribbean Creoles point out that some of its grammatical features can be traced to African languages while others can be traced to European languages. Three areas have been identified as significant for the identification of the linguistic origins of those forced migrants who arrived before 1710: the Gold Coast, the Slave Coast and the Windward Coast. Sociohistorical information from Anguilla's archives suggest that Africans and Europeans formed two distinct, but perhaps overlapping speech communities in the early phases of the island's colonisation. "Anguillian" is believed to have emerged as the language of the masses as time passed, slavery was abolished and locals began to see themselves as "belonging" to Anguillan society. Education There are six government

There is a single library, the Edison L. Hughes Education & Library Complex of the Anguilla Public Library. A branch of the Saint James School of Medicine was established in 2011 in Anguilla. It is a private, for-profit medical school headquartered in Park Ridge, Illinois. There is a University of the West Indies Open campus site in the island. Culture The island's cultural history begins with the native Taino, Arawak and Carib. Their artefacts have been found around the island, telling of life before European settlers arrived. The Anguilla National Trust (ANT) was established in 1988 and opened its offices in 1993 charged with the responsibility of preserving the heritage of the island, including its cultural heritage. As throughout the Caribbean, holidays are a cultural fixture. Anguilla's most important holidays are of historic as much as cultural importance – particularly the anniversary of the emancipation (previously August Monday in the Park), celebrated as the Summer Festival, or Carnival. British festivities, such as the Queen's Birthday, are also celebrated. Cuisine Anguillan cuisine is influenced by native Caribbean, African, Spanish, French, and English cuisines. Seafood is abundant, including prawns, shrimp, crab, spiny lobster, conch, mahi-mahi, red snapper, marlin, and grouper. Salt cod is a staple food eaten on its own and used in stews, casseroles and soups. Livestock is limited due to the small size of the island and people there use poultry, pork, goat, and mutton, along with imported beef. Goat is the most commonly eaten meat, used in a variety of dishes. The official national food of Anguilla is pigeon peas and rice. A significant amount of the island's produce is imported due to limited land suitable for agriculture production; much of the soil is sandy and infertile. The agriculture produce of Anguilla includes tomatoes, peppers, limes and other citrus fruits, onion, garlic, squash, pigeon peas, and callaloo. Starch staple foods include imported rice and other foods that are imported or locally grown, including yams, sweet potatoes and breadfruit. Literature The Anguilla National Trust has programmes encouraging Anguillan writers and the preservation of the island's history. In 2015, Where I See The Sun – Contemporary Poetry in Anguilla A New Anthology by Lasana M. Sekou was published by House of Nehesi Publishers. Among the forty three poets in the collection are Rita Celestine-Carty, Bankie Banx, John T. Harrigan, Patricia J. Adams, Fabian Fahie, Dr. Oluwakemi Linda Banks, and Reuel Ben Lewi. Music Various Caribbean musical genres are popular on the island, such as reggae, soca and calypso. Sports Boat racing has deep roots in Anguillan culture and is the national sport. There are regular sailing regattas on national holidays, such as Carnival, which are contested by locally built and designed boats. These boats have names and have sponsors that print their logo on their sails. As in many other former British colonies, cricket is also a popular sport. Anguilla is the home of Omari Banks, who played for the West Indies Cricket Team, while Cardigan Connor played first-class cricket for English county side Hampshire and was 'chef de mission' (team manager) for Anguilla's Commonwealth Games team in 2002. Other noted players include Chesney Hughes, who played for Derbyshire County Cricket Club in England. Rugby union is represented in Anguilla by the Anguilla Eels RFC, who were formed in April 2006. The Eels have been finalists in the St. Martin tournament in November 2006 and semi-finalists in 2007, 2008, 2009 and Champions in 2010. The Eels were formed in 2006 by Scottish club national second row Martin Welsh, Club Sponsor and President of the AERFC Ms. Jacquie Ruan, and Canadian standout Scrumhalf Mark Harris (Toronto Scottish RFC). Anguilla is the birthplace of sprinter Zharnel Hughes who has represented Great Britain since 2015, and England at the 2018 Commonwealth Games. He won the 100 metres at the 2018 European Athletics Championships, the 4 x 100 metres at the same championships, and the 4 x 100 metres for England at the 2018 Commonwealth Games. He also won a silver medal on the 4x100 m relay for Great Britain at the 2020 Olympic Games. Shara Proctor, British Long Jump Silver Medalist in World Championships in Beijing first represented Anguilla in the event until 2010 when she began to represent Great Britain and England. Under the Anguillan Flag she achieved several medals in the NACAC games. Keith Connor, triple jumper, is also an Anguillan. He represented Great Britain and England and achieved several international titles including Commonwealth and European Games gold medals and an Olympic bronze medal. Keith later became Head Coach of Australia Athletics. Natural history Wildlife Anguilla has habitat for the Cuban tree frogs (Osteopilus septentrionalis). The red-footed tortoise (Chelonoidis carbonaria) is a species of tortoise found here, which originally came from South America. Hurricanes in the mid-90s led to over-water dispersal of the green iguanas (Iguana iguana) to Anguilla. All three animals are introductions. Five species of bats are known in the literature from Anguilla – the threatened insular single leaf bat (Monophyllus plethodon), the Antillean fruit-eating bat (Brachyphylla cavernarum), the Jamaican fruit bat (Artibeus jamaicensis), the Mexican funnel-eared bat (Natalus stramineus), and the velvety free-tailed bat (Molossus molossus). Notable people Shomari Kentish (born 1983), Anguillan football player Kelvin Liddie (born 1981), Anguillan football player Economy

use: 6,200 (2002) country comparison to the world: 212 Telephones – mobile cellular: 1,800 (2002) country comparison to the world: 211 Telephone system: Domestic: Modern internal telephone system International: EAST CARIBBEAN FIBRE SYSTEM ECFS (cable system) microwave radio relay to island of Saint Martin (Guadeloupe and Netherlands Antilles) Mobile phone (GSM) Mobile phone operators: FLOW (Anguilla) Ltd. – GSM and UMTS 850 and 1900 MHz, LTE 700 MHz with Island-wide coverage Digicel (Anguilla) Ltd. – GSM and UMTS 850 to 1900 MHz,

and UMTS 850 and 1900 MHz, LTE 700 MHz with Island-wide coverage Digicel (Anguilla) Ltd. – GSM and UMTS 850 to 1900 MHz, LTE 700 MHz Mobiles: ? (2007) Radio Radio broadcast stations: AM 3, FM 7, shortwave 0 (2007) Radios: 3,000 (1997) Television Television broadcast stations: 1 (1997) Televisions: 1,000 (1997) Internet Internet country code: .ai (Top level domain) Internet Service Providers (ISPs): 2 (FLOW – , Digicel Anguilla – ) Internet hosts: 269 (2012) country comparison to the world: 192

the Northern Territory. When self-government was granted to the Northern Territory on 1 July 1978, administration of Ashmore and Cartier Islands was retained by the Commonwealth. In 1983, the territory was declared a nature reserve under the National Parks and Wildlife Conservation Act 1975, now replaced by the Environment Protection and Biodiversity Conservation Act 1999. Cartier Island, which was a former bombing range, became a marine reserve in 2000. After the islands became a first point of contact with the Australian migration zone, in September 2001, the Australian government excised the Ashmore and Cartier Islands from the Australian migration zone. Indonesian heritage and memorandum Ashmore has been regularly visited and fished by Indonesian fishermen since the early eighteenth century. A 1974 Memorandum of Understanding (MOU) between Australia and Indonesia sets out arrangements by which traditional fishers can access resources in Australia's territorial sea in the region. This allows traditional Indonesian fishermen to access parts of Ashmore for shelter, freshwater and to visit grave sites. The area, known as the MOU Box, contains the Ashmore and Cartier Islands Territory. Governance Today, the Territory is administered from Canberra by the Department of Infrastructure, Regional Development and Cities, which is also responsible for the administration of the territories of Christmas Island, Cocos (Keeling) Islands, the Coral Sea Islands, Jervis Bay Territory and Norfolk Island. The Attorney-General's Department had been responsible for the administration of Australian territories until the 2010 federal election. In that year the responsibility for Australian territories was transferred to the then Department of Regional Australia, Local Government, Arts and Sport, and from 18 September 2013 the Department of Infrastructure and Regional Development has administered Australian territories. Defence of Ashmore and Cartier Islands is the responsibility of Australia, with periodic visits by the Royal Australian Navy, Royal Australian Air Force and Australian Customs and Border Protection Service. Nearby Hibernia Reef, northeast of Ashmore Reef, is not part of the Territory, but belongs to Western Australia. It has no permanently dry land area, although large parts of the reef become exposed during low tide. Environment and protection The Ashmore Reef Marine Park and Cartier Island Marine Park are both classed as strict nature reserves (IUCN Ia) and protect biodiverse areas of significant and international importance, as well as cultural heritage. Economy There is no economic activity in the Territory, Ashmore and Cartier Islands being uninhabited. Cartier Island is an unvegetated sand island. Access to Cartier Island is prohibited because of the risk of unexploded ordnances. There are no ports or harbours, only offshore anchorage. The Australian Border Force vessel is stationed off the reef for up to 300 days per year. The islands are also visited by seasonal caretakers and occasional scientific researchers. The area has been a traditional fishing ground of Indonesian fishermen for centuries, and continues. In the 1850s, American whalers operated in the region. Mining of phosphate deposits took place on Ashmore Island in the latter half of the 19th

an unvegetated sand island. Access to Cartier Island is prohibited because of the risk of unexploded ordnances. There are no ports or harbours, only offshore anchorage. The Australian Border Force vessel is stationed off the reef for up to 300 days per year. The islands are also visited by seasonal caretakers and occasional scientific researchers. The area has been a traditional fishing ground of Indonesian fishermen for centuries, and continues. In the 1850s, American whalers operated in the region. Mining of phosphate deposits took place on Ashmore Island in the latter half of the 19th century. Today, all the wells in the Territory are infected with cholera or contaminated and undrinkable. Petroleum extraction activities take place at the Jabiru and Challis oil fields, which are adjacent to the Territory, and which are administered by the Northern Territory Department of Mines and Energy on behalf of the Commonwealth. Migration As Ashmore Reef is the closest point of Australian territory to Indonesia, it was a popular target for people smugglers transporting asylum seekers en route to Australia. Once they had landed on Ashmore Island, asylum seekers could claim to have entered Australian migration zone and request to be processed as refugees. The use of Ashmore Island for this purpose created great notoriety during late 2001, when refugee arrivals became a major political issue in Australia. The Australian Government argued that as Australia was not the country of first asylum for these "boat people", Australia did not have a responsibility to accept them. A number of things were done to discourage the use of the Territory for this purpose, such as attempting to have the people smugglers arrested in Indonesia; the so-called Pacific Solution of processing them in third countries; the boarding and forced turnaround of the boats by Australian military forces; and finally excising the Territory and many other small islands from the Australian migration zone. Two boatloads of asylum seekers were each detained for several days in the lagoon at Ashmore Island after failed attempts by the Royal Australian Navy to turn them back to Indonesia in October 2001. See also Immigration detention in Australia Siev 36 References Notes External links Ashmore and Cartier Islands. The World Factbook. Central Intelligence Agency. Geoscience Australia—Ashmore and Cartier Islands Department of the Environment and Heritage—Ashmore Reef National Nature Reserve Department of the Environment and Heritage—Cartier Island Commonwealth Marine Reserve First on list of Australian islands "Ashmore Reef Belongs to Indonesia," posted on East Timor Action Network. "Ashmore Islands are member of ARABOSAI" Ramsar sites in Australia Important Bird Areas of Australian External Territories Immigration to Australia Territorial disputes

Noting that the equilibrium pressures and densities are constant, this simplifies to A Moving Medium Starting with We can have these equations work for a moving medium by setting , where is the constant velocity that the whole fluid is moving at before being disturbed (equivalent to a moving observer) and is the fluid velocity. In this case the equations look very similar: Note that setting returns the equations at rest. Linearized Waves Starting with the above given equations of motion for a medium at rest: Let us now take to all be small quantities. In the case that we keep terms to first order, for the continuity equation, we have the term going to 0. This similarly applies for the density perturbation times the time derivative of the velocity. Moreover, the spatial components of the material derivative go to 0. We thus have, upon rearranging the equilibrium density: Next, given that our sound wave occurs in an ideal fluid, the motion is adiabatic, and then we can relate the small change in the pressure to the small change in the density by Under this condition, we see that we now have Defining the speed of sound of the system: Everything becomes For Irrotational Fluids In the case that the fluid is irrotational, that is , we can then write and thus write our equations of motion as The second equation tells us that And the use of this equation in the continuity equation tells us that This simplifies to Thus the velocity potential obeys the wave equation in the limit of small disturbances. The boundary conditions required to solve for the potential come from the fact that the velocity of the fluid must be 0 normal to the fixed surfaces of the system. Taking the time derivative of this wave equation and multiplying all sides by the unperturbed density, and then using the fact that tells us that Similarly, we saw that . Thus we can multiply the above equation appropriately and see that Thus,

similarly applies for the density perturbation times the time derivative of the velocity. Moreover, the spatial components of the material derivative go to 0. We thus have, upon rearranging the equilibrium density: Next, given that our sound wave occurs in an ideal fluid, the motion is adiabatic, and then we can relate the small change in the pressure to the small change in the density by Under this condition, we see that we now have Defining the speed of sound of the system: Everything becomes For Irrotational Fluids In the case that the fluid is irrotational, that is , we can then write and thus write our equations of motion as The second equation tells us that And the use of this equation in the continuity equation tells us that This simplifies to Thus the velocity potential obeys the wave equation in the limit of small disturbances. The boundary conditions required to solve for the potential come from the fact that the velocity of the fluid must be 0 normal to the fixed surfaces of the system. Taking the time derivative of this wave equation

that leg. While in Kingston, Mackenzie became a vocal opponent of religious and political entitlement and corruption in government. Mackenzie married Helen Neil (1826–52) in 1845 and with her had three children, with only one girl, Mary, surviving infancy. Helen and he moved to Sarnia, Ontario (known as Canada West) in 1847 and Mary was born in 1848. They were soon joined from Scotland by the rest of Mackenzie's brothers and his mother. He began working as a general contractor, earning a reputation for being a hard-working, honest man, as well as having a working man's view on fiscal policy. Mackenzie helped construct many courthouses and jails across southern Ontario. A number of these still stand today, including the Sandwich Courthouse and Jail now known as the Mackenzie Hall Cultural Centre in Windsor, Ontario, and the Kent County Courthouse and Jail in Chatham, Ontario. He even bid, unsuccessfully, on the construction of the Parliament buildings in Ottawa in 1859. Helen died in 1852, finally succumbing to the effects of excessive doses of mercury-based calomel used to treat a fever while in Kingston. In 1853, he married Jane Sym (1825–93). Early political involvement Mackenzie involved himself in politics almost from the moment he arrived in Canada. He fought passionately for equality and the elimination of all forms of class distinction. In 1851, he became the secretary for the Reform Party for Lambton. After convincing him to run in Kent/Lambton, Mackenzie campaigned relentlessly for George Brown, owner of the Reformist paper The Globe in the 1851 election, helping Brown to win his first seat in the Legislative Assembly. Mackenzie and Brown remained the closest of friends and colleagues for the rest of their lives. In 1852, Mackenzie became editor of another reformist paper, the Lambton Shield. As an editor, Mackenzie was perhaps a little too vocal, leading the paper to a lawsuit for libel against the local conservative candidate. Because a key witness claimed Cabinet Confidence and would not testify, the paper lost the suit and was forced to fold due to financial hardship. After his brother, Hope Mackenzie, declined to run, Alexander was petitioned to run and won his first seat in the Legislative Assembly as a supporter of George Brown in 1861. When Brown resigned from the Great Coalition in 1865 over reciprocity negotiations with the United States, Mackenzie was invited to replace him as the president of the council. Wary of Macdonald's motivations and true to his principles, Mackenzie declined. He entered the House of Commons of Canada in 1867, representing the Lambton, Ontario, riding. No cohesive national Liberal Party of Canada existed at the time and with Brown not winning his seat, no official leader emerged. Mackenzie did not believe he was the best qualified for the position, and although he resisted offers of the position, he nevertheless sat as the de facto leader of the Official Opposition. Prime Minister (1873–1878) When the Macdonald government fell due to the Pacific Scandal in 1873, the Governor General, Lord Dufferin, called upon Mackenzie, who had been chosen as the leader of the Liberal Party a few months earlier, to form a new government. Mackenzie formed a government and asked the Governor General to call an election for January 1874. The Liberals won a majority of the seats in the House of Commons having garnered 40% of the popular vote. Mackenzie remained prime minister until the 1878 election when Macdonald's Conservatives returned to power with a majority government. For a man of Mackenzie's humble origins to attain such a position was unusual in an age which generally offered such opportunity only to the privileged. Lord Dufferin expressed early misgivings about a stonemason taking over government, but on meeting Mackenzie, Dufferin revised his opinions: Mackenzie served concurrently as Minister of Public Works and oversaw the completion of the Parliament buildings. While drawing up the plans for the West Block, he included a circular staircase leading directly from his office to the outside of the building, which allowed him to escape the patronage-seekers waiting for him in his ante-chamber. Proving Dufferin's reflections on his character to be true, Mackenzie disliked intensely the patronage inherent in politics. Nevertheless, he found it a necessary evil to maintain party unity and ensure the loyalty of his fellow Liberals. In keeping with his democratic ideals, Mackenzie refused the offer of a knighthood three times, and was thus the only one of Canada's first eight Prime Ministers not to be knighted. He also declined appointment to the UK Privy Council and hence does not bear the title "Right Honourable". His pride in his working class origins never left him. Once, while touring Fort Henry as prime minister, he asked the soldier accompanying him if he knew the thickness of the wall beside them. The embarrassed escort confessed that he didn't and Mackenzie replied, "I do. It is five feet, ten inches. I know, because I built it myself!" As Prime Minister, Alexander Mackenzie strove to reform and simplify the machinery of government, achieving a remarkable record of reform legislation. He introduced the secret ballot; advised the creation of the Supreme Court of Canada; the establishment of the Royal Military College of Canada in Kingston in 1874; and the creation of the Office of the Auditor General in 1878. He completed the Intercolonial Railway, but struggled to progress on the national railway due to a worldwide economic depression, almost coming to blows with the then Governor General Lord Dufferin over imperial interference. Mackenzie stood up for the rights of Canada as a nation and fought for the supremacy of Parliament and honesty in government. Above all else, he was known and loved for his honesty and integrity. However, his term was marked by economic depression that had grown out of the Panic of 1873, which Mackenzie's government was unable to alleviate. In 1874, Mackenzie negotiated a new free trade agreement with the United States, eliminating the high protective tariffs on Canadian goods in US markets. However, this action did not bolster the economy, and construction of the CPR slowed drastically due to lack of funding. In 1876, the Conservative opposition announced a National Policy of protective tariffs, which resonated with voters. When an election was held at the conclusion of Mackenzie's five-year term, the Conservatives were swept back into office in a landslide victory. Supreme Court appointments Mackenzie chose the following jurists to be appointed as justices of the Supreme Court of Canada by the Governor General: Sir William Buell Richards (Chief Justice) – September 30, 1875 Télesphore Fournier – September 30, 1875 William Alexander Henry – September 30, 1875 Sir William Johnstone Ritchie – September 30, 1875 Sir Samuel Henry Strong – September 30, 1875 Jean-Thomas Taschereau – September 30, 1875 Sir Henri Elzéar Taschereau – October 7, 1878 Later life After his government's defeat, Mackenzie remained Leader of the Opposition for another two years, until 1880. In 1881, he became the first president of The North American Life Assurance Company. He was soon struck with a mysterious ailment that sapped his strength and all but took his voice. Sitting in silence, he nevertheless remained an undefeated MP until his death in 1892 from a stroke that resulted from hitting his head during a fall. He died in Toronto and was buried in Lakeview Cemetery in Sarnia, Ontario. Character Mackenzie's first biography in 1892 referred to him as Canada's Stainless Statesman. He was a devout Baptist and teetotaller who found refuge in, and drew strength from, his family, friends, and faith. He was also a loyal friend and an incorrigible prankster (stuffed chimney on young in-laws; rolled boulder down Thunder Cape towards friend A. McKellar; burned Tory campaign placards in hotel woodstove early in morning). Unpretentious and down to earth, his public official austerity was in striking contrast to private compassion and giving nature. He was the soul of honour and integrity, a proud man who sought no recognition or personal enrichment and accepted gifts reluctantly. He preferred to follow than lead (unreferenced – many times he refused leadership offers) and often found duty outweighed heavy burden of office. He was uncompromising on his principles, perhaps too

today, including the Sandwich Courthouse and Jail now known as the Mackenzie Hall Cultural Centre in Windsor, Ontario, and the Kent County Courthouse and Jail in Chatham, Ontario. He even bid, unsuccessfully, on the construction of the Parliament buildings in Ottawa in 1859. Helen died in 1852, finally succumbing to the effects of excessive doses of mercury-based calomel used to treat a fever while in Kingston. In 1853, he married Jane Sym (1825–93). Early political involvement Mackenzie involved himself in politics almost from the moment he arrived in Canada. He fought passionately for equality and the elimination of all forms of class distinction. In 1851, he became the secretary for the Reform Party for Lambton. After convincing him to run in Kent/Lambton, Mackenzie campaigned relentlessly for George Brown, owner of the Reformist paper The Globe in the 1851 election, helping Brown to win his first seat in the Legislative Assembly. Mackenzie and Brown remained the closest of friends and colleagues for the rest of their lives. In 1852, Mackenzie became editor of another reformist paper, the Lambton Shield. As an editor, Mackenzie was perhaps a little too vocal, leading the paper to a lawsuit for libel against the local conservative candidate. Because a key witness claimed Cabinet Confidence and would not testify, the paper lost the suit and was forced to fold due to financial hardship. After his brother, Hope Mackenzie, declined to run, Alexander was petitioned to run and won his first seat in the Legislative Assembly as a supporter of George Brown in 1861. When Brown resigned from the Great Coalition in 1865 over reciprocity negotiations with the United States, Mackenzie was invited to replace him as the president of the council. Wary of Macdonald's motivations and true to his principles, Mackenzie declined. He entered the House of Commons of Canada in 1867, representing the Lambton, Ontario, riding. No cohesive national Liberal Party of Canada existed at the time and with Brown not winning his seat, no official leader emerged. Mackenzie did not believe he was the best qualified for the position, and although he resisted offers of the position, he nevertheless sat as the de facto leader of the Official Opposition. Prime Minister (1873–1878) When the Macdonald government fell due to the Pacific Scandal in 1873, the Governor General, Lord Dufferin, called upon Mackenzie, who had been chosen as the leader of the Liberal Party a few months earlier, to form a new government. Mackenzie formed a government and asked the Governor General to call an election for January 1874. The Liberals won a majority of the seats in the House of Commons having garnered 40% of the popular vote. Mackenzie remained prime minister until the 1878 election when Macdonald's Conservatives returned to power with a majority government. For a man of Mackenzie's humble origins to attain such a position was unusual in an age which generally offered such opportunity only to the privileged. Lord Dufferin expressed early misgivings about a stonemason taking over government, but on meeting Mackenzie, Dufferin revised his opinions: Mackenzie served concurrently as Minister of Public Works and oversaw the completion of the Parliament buildings. While drawing up the plans for the West Block, he included a circular staircase leading directly from his office to the outside of the building, which allowed him to escape the patronage-seekers waiting for him in his ante-chamber. Proving Dufferin's reflections on his character to be true, Mackenzie disliked intensely the patronage inherent in politics. Nevertheless, he found it a necessary evil to maintain party unity and ensure the loyalty of his fellow Liberals. In keeping with his democratic ideals, Mackenzie refused the offer of a knighthood three times, and was thus the only one of Canada's first eight Prime Ministers not to be knighted. He also declined appointment to the UK Privy Council and hence does not bear the title "Right Honourable". His pride in his working class origins never left him. Once, while touring Fort Henry as prime minister, he asked the soldier accompanying him if he knew the thickness of the wall beside them. The embarrassed escort confessed that he didn't and Mackenzie replied, "I do. It is five feet, ten inches. I know, because I built it myself!" As Prime Minister, Alexander Mackenzie strove to reform and simplify the machinery of government, achieving a remarkable record of reform legislation. He introduced the secret ballot; advised the creation of the Supreme Court of Canada; the establishment of the Royal Military College of Canada in Kingston in 1874; and the creation of the Office of the Auditor General in 1878. He completed the Intercolonial Railway, but struggled to progress on the national railway due to a worldwide economic depression, almost coming to blows with the then Governor General Lord Dufferin over imperial interference. Mackenzie stood up for the rights of Canada as a nation and fought for the supremacy of Parliament and honesty in government. Above all else, he was known and loved for his honesty and integrity. However, his term was marked by economic depression that had grown out of the Panic of 1873, which Mackenzie's government was unable to alleviate. In 1874, Mackenzie negotiated a new free trade agreement with the United States, eliminating the high protective tariffs on Canadian goods in US markets. However, this action did not bolster the economy, and construction of the CPR slowed drastically due to lack of funding. In 1876, the Conservative opposition announced a National Policy of protective tariffs, which resonated with voters. When an election was held at the conclusion of Mackenzie's five-year term, the Conservatives were swept back into office in a landslide victory. Supreme Court appointments Mackenzie chose the following jurists to be appointed as justices of the Supreme Court of Canada by the Governor General: Sir William Buell Richards (Chief Justice) – September 30, 1875 Télesphore Fournier – September 30, 1875 William Alexander Henry – September 30, 1875 Sir William Johnstone Ritchie – September 30, 1875 Sir Samuel Henry Strong – September 30, 1875 Jean-Thomas Taschereau – September 30, 1875 Sir Henri Elzéar Taschereau – October 7, 1878 Later life After his government's defeat, Mackenzie remained Leader of the Opposition for another two years, until 1880. In 1881, he became the first president of The North American Life Assurance Company. He was soon struck with a mysterious ailment that sapped his strength and all but took his voice. Sitting in silence, he nevertheless remained an undefeated MP until his death in 1892 from a stroke that resulted from hitting his head during a fall. He died in Toronto and was buried in Lakeview Cemetery in Sarnia, Ontario. Character Mackenzie's first biography in 1892 referred to him as Canada's Stainless Statesman. He was a devout Baptist and teetotaller who found refuge in, and drew strength from, his family, friends, and faith. He was also a loyal friend and an incorrigible prankster (stuffed chimney on young in-laws; rolled boulder down Thunder Cape towards friend A. McKellar; burned Tory campaign placards in hotel woodstove early in morning). Unpretentious and down to earth, his public official austerity was in striking contrast to private compassion and giving nature. He was the soul of honour and integrity, a proud man who sought no recognition or personal enrichment

may have encamped at Rupnath, where his inscription has been found. According to the Sri Lankan tradition, Ashoka visited Vidisha, where he fell in love with a beautiful woman on his way to Ujjain. According to the Dipamvamsa and Mahamvamsa, the woman was Devi – the daughter of a merchant. According to the Mahabodhi-vamsa, she was Vidisha-Mahadevi and belonged to the Shakya clan of Gautama Buddha. The Buddhist chroniclers may have fabricated the Shakya connection to connect Ashoka's family to Buddha. The Buddhist texts allude to her being a Buddhist in her later years but do not describe her conversion to Buddhism. Therefore, it is likely that she was already a Buddhist when she met Ashoka. The Mahavamsa states that Devi gave birth to Ashoka's son Mahinda in Ujjain, and two years later, to a daughter named Sanghamitta. According to the Mahavamsa, Ashoka's son Mahinda was ordained at the age of 20 years, during the sixth year of Ashoka's reign. That means Mahinda must have been 14 years old when Ashoka ascended the throne. Even if Mahinda was born when Ashoka was as young as 20 years old, Ashoka must have ascended the throne at 34 years, which means he must have served as a viceroy for several years. Ascension to the throne Legends suggest that Ashoka was not the crown prince, and his ascension on the throne was disputed. Ashokavadana states that Bindusara's eldest son Susima once slapped a bald minister on his head in jest. The minister worried that after ascending the throne, Susima may jokingly hurt him with a sword. Therefore, he instigated five hundred ministers to support Ashoka's claim to the throne when the time came, noting that Ashoka was predicted to become a chakravartin (universal ruler). Sometime later, Takshashila rebelled again, and Bindusara dispatched Susima to curb the rebellion. Shortly after, Bindusara fell ill and was expected to die soon. Susima was still in Takshashila, having been unsuccessful in suppressing the rebellion. Bindusara recalled him to the capital and asked Ashoka to march to Takshashila. However, the ministers told him that Ashoka was ill and suggested that he temporarily install Ashoka on the throne until Susmia's return from Takshashila. When Bindusara refused to do so, Ashoka declared that if the throne were rightfully his, the gods would crown him as the next king. At that instance, the gods did so, Bindusara died, and Ashoka's authority extended to the entire world, including the Yaksha territory located above the earth and the Naga territory located below the earth. When Susima returned to the capital, Ashoka's newly appointed prime minister Radhagupta tricked him into a pit of charcoal. Susima died a painful death, and his general Bhadrayudha became a Buddhist monk. The Mahavamsa states that when Bindusara fell sick, Ashoka returned to Pataliputra from Ujjain and gained control of the capital. After his father's death, Ashoka had his eldest brother killed and ascended the throne. The text also states that Ashoka killed ninety-nine of his half-brothers, including Sumana. The Dipavamsa states that he killed a hundred of his brothers and was crowned four years later. The Vamsatthapakasini adds that an Ajivika ascetic had predicted this massacre based on the interpretation of a dream of Ashoka's mother. According to these accounts, only Ashoka's uterine brother Tissa was spared. Other sources name the surviving brother Vitashoka, Vigatashoka, Sudatta (So-ta-to in A-yi-uang-chuan), or Sugatra (Siu-ka-tu-lu in Fen-pie-kung-te-hun). The figures such as 99 and 100 are exaggerated and seem to be a way of stating that Ashoka killed several of his brothers. Taranatha states that Ashoka, who was an illegitimate son of his predecessor, killed six legitimate princes to ascend the throne. It is possible that Ashoka was not the rightful heir to the throne and killed a brother (or brothers) to acquire the throne. However, the Buddhist sources have exaggerated the story, which attempts to portray him as evil before his conversion to Buddhism. Ashoka's Rock Edict No. 5 mentions officers whose duties include supervising the welfare of "the families of his brothers, sisters, and other relatives". This suggests that more than one of his brothers survived his ascension. However, some scholars oppose this suggestion, arguing that the inscription talks only about the families of his brothers, not the brothers themselves. Date of ascension According to the Sri Lankan texts Mahavamsa and the Dipavamsa, Ashoka ascended the throne 218 years after the death of Gautama Buddha and ruled for 37 years. The date of the Buddha's death is itself a matter of debate, and the North Indian tradition states that Ashoka ruled a hundred years after the Buddha's death, which has led to further debates about the date. Assuming that the Sri Lankan tradition is correct, and assuming that the Buddha died in 483 BCE – a date proposed by several scholars – Ashoka must have ascended the throne in 265 BCE. The Puranas state that Ashoka's father Bindusara reigned for 25 years, not 28 years as specified in the Sri Lankan tradition. If this is true, Ashoka's ascension can be dated three years earlier, to 268 BCE. Alternatively, if the Sri Lankan tradition is correct, but if we assume that the Buddha died in 486 BCE (a date supported by the Cantonese Dotted Record), Ashoka's ascension can be dated to 268 BCE. The Mahavamsa states that Ashoka consecrated himself as the king four years after becoming a sovereign. This interregnum can be explained assuming that he fought a war of succession with other sons of Bindusara during these four years. The Ashokavadana contains a story about Ashoka's minister Yashas hiding the sun with his hand. Professor P. H. L. Eggermont theorised that this story was a reference to a partial solar eclipse that was seen in northern India on 4 May 249 BCE. According to the Ashokavadana, Ashoka went on a pilgrimage to various Buddhist sites sometime after this eclipse. Ashoka's Rummindei pillar inscription states that he visited Lumbini during his 21st regnal year. Assuming this visit was a part of the pilgrimage described in the text, and assuming that Ashoka visited Lumbini around 1–2 years after the solar eclipse, the ascension date of 268–269 BCE seems more likely. However, this theory is not universally accepted. For example, according to John S. Strong, the event described in the Ashokavadana has nothing to do with chronology, and Eggermont's interpretation grossly ignores the literary and religious context of the legend. Reign before Buddhist influence Both Sri Lankan and North Indian traditions assert that Ashoka was a violent person before Buddhism. Taranatha also states that Ashoka was initially called "Kamashoka" because he spent many years in pleasurable pursuits (kama); he was then called "Chandashoka" ("Ashoka the fierce") because he spent some years performing evil deeds; and finally, he came to be known as Dhammashoka ("Ashoka the righteous") after his conversion to Buddhism. The Ashokavadana also calls him "Chandashoka", and describes several of his cruel acts: The ministers who had helped him ascend the throne started treating him with contempt after his ascension. To test their loyalty, Ashoka gave them the absurd order of cutting down every flower-and fruit-bearing tree. When they failed to carry out this order, Ashoka personally cut off the heads of 500 ministers. One day, during a stroll at a park, Ashoka and his concubines came across a beautiful Ashoka tree. The sight put him in a sensual mood, but the women did not enjoy caressing his rough skin. Sometime later, when Ashoka fell asleep, the resentful women chopped the flowers and the branches of his namesake tree. After Ashoka woke up, he burnt 500 of his concubines to death as a punishment. Alarmed by the king's involvement in such massacres, prime minister Radha-Gupta proposed hiring an executioner to carry out future mass killings to leave the king unsullied. Girika, a Magadha village boy who boasted that he could execute the whole of Jambudvipa, was hired for the purpose. He came to be known as Chandagirika ("Girika the fierce"), and on his request, Ashoka built a jail in Pataliputra. Called Ashoka's Hell, the jail looked lovely from outside, but inside it, Girika brutally tortured the prisoners. The 5th-century Chinese traveller Faxian states that Ashoka personally visited the underworld to study torture methods there and then invented his methods. The 7th-century traveller Xuanzang claims to have seen a pillar marking the site of Ashoka's "Hell". The Mahavamsa also briefly alludes to Ashoka's cruelty, stating that Ashoka was earlier called Chandashoka because of his evil deeds but came to be called Dharmashoka because of his pious acts after his conversion to Buddhism. However, unlike the north Indian tradition, the Sri Lankan texts do not mention any specific evil deeds performed by Ashoka, except his killing of 99 of his brothers. Such descriptions of Ashoka as an evil person before his conversion to Buddhism appear to be a fabrication of the Buddhist authors, who attempted to present the change that Buddhism brought to him as a miracle. In an attempt to dramatise this change, such legends exaggerate Ashoka's past wickedness and his piousness after the conversion. Kalinga war and conversion to Buddhism Ashoka's inscriptions mention that he conquered the Kalinga region during his 8th regnal year: the destruction caused during the war made him repent violence, and in the subsequent years, he was drawn towards Buddhism. Edict 13 of the Edicts of Ashoka Rock Inscriptions expresses the great remorse the king felt after observing the destruction of Kalinga: On the other hand, the Sri Lankan tradition suggests that Ashoka was already a devoted Buddhist by his 8th regnal year, converted to Buddhism during his 4th regnal year, and constructed 84,000 viharas during his 5th–7th regnal years. The Buddhist legends make no mention of the Kalinga campaign. Based on Sri Lankan tradition, some scholars, such as Eggermont, believe Ashoka converted to Buddhism before the Kalinga war. Critics of this theory argue that if Ashoka were already a Buddhist, he would not have waged the violent Kalinga War. Eggermont explains this anomaly by theorising that Ashoka had his interpretation of the "Middle Way". Some earlier writers believed that Ashoka dramatically converted to Buddhism after seeing the suffering caused by the war since his Major Rock Edict 13 states that he became closer to the dhamma after the annexation of Kalinga. However, even if Ashoka converted to Buddhism after the war, epigraphic evidence suggests that his conversion was a gradual process rather than a dramatic event. For example, in a Minor Rock Edict issued during his 13th regnal year (five years after the Kalinga campaign), he states that he had been an upasaka (lay Buddhist) for more than two and a half years, but did not make much progress; in the past year, he was drawn closer to the sangha and became a more ardent follower. The war According to Ashoka's Major Rock Edict 13, he conquered Kalinga 8 years after ascending to the throne. The edict states that during his conquest of Kalinga, 100,000 men and animals were killed in action; many times that number "perished"; and 150,000 men and animals were carried away from Kalinga as captives. Ashoka states that the repentance of these sufferings caused him to devote himself to the practice and propagation of dharma. He proclaims that he now considered the slaughter, death and deportation caused during the conquest of a country painful and deplorable; and that he considered the suffering caused to the religious people and householders even more deplorable. This edict has been inscribed at several places, including Erragudi, Girnar, Kalsi, Maneshra, Shahbazgarhi and Kandahar. However, it is omitted in Ashoka's inscriptions found in the Kalinga region, where the Rock Edicts 13 and 14 have been replaced by two separate edicts that make no mention of Ashoka's remorse. It is possible that Ashoka did not consider it politically appropriate to make such a confession to the people of Kalinga. Another possibility is the Kalinga war and its consequences, as described in Ashoka's rock edicts, are "more imaginary than real". This description is meant to impress those far removed from the scene, thus unable to verify its accuracy. Ancient sources do not mention any other military activity of Ashoka, although the 16th-century writer Taranatha claims that Ashoka conquered the entire Jambudvipa. First contact with Buddhism Different sources give different accounts of Ashoka's conversion to Buddhism. According to Sri Lankan tradition, Ashoka's father, Bindusara, was a devotee of Brahmanism, and his mother Dharma was a devotee of Ajivikas. The Samantapasadika states that Ashoka followed non-Buddhist sects during the first three years of his reign. The Sri Lankan texts add that Ashoka was not happy with the behaviour of the Brahmins who received his alms daily. His courtiers produced some Ajivika and Nigantha teachers before him, but these also failed to impress him. The Dipavamsa states that Ashoka invited several non-Buddhist religious leaders to his palace and bestowed great gifts upon them in the hope that they would answer a question posed by the king. The text does not state what the question was but mentions that none of the invitees were able to answer it. One day, Ashoka saw a young Buddhist monk called Nigrodha (or Nyagrodha), who was looking for alms on a road in Pataliputra. He was the king's nephew, although the king was not aware of this: he was a posthumous son of Ashoka's eldest brother Sumana, whom Ashoka had killed during the conflict for the throne. Ashoka was impressed by Nigrodha's tranquil and fearless appearance, and asked him to teach him his faith. In response, Nigrodha offered him a sermon on appamada (earnestness). Impressed by the sermon, Ashoka offered Nigrodha 400,000 silver coins and 8 daily portions of rice. The king became a Buddhist upasaka, and started visiting the Kukkutarama shrine at Pataliputra. At the temple, he met the Buddhist monk Moggaliputta Tissa, and became more devoted to the Buddhist faith. The veracity of this story is not certain. This legend about Ashoka's search for a worthy teacher may be aimed at explaining why Ashoka did not adopt Jainism, another major contemporary faith that advocates non-violence and compassion. The legend suggests that Ashoka was not attracted to Buddhism because he was looking for such a faith, rather, for a competent spiritual teacher. The Sri Lankan tradition adds that during his 6th regnal year, Ashoka's son Mahinda became a Buddhist monk, and his daughter became a Buddhist nun. A story in Divyavadana attributes Ashoka's conversion to the Buddhist monk Samudra, who was an ex-merchant from Shravasti. According to this account, Samudra was imprisoned in Ashoka's "Hell", but saved himself using his miraculous powers. When Ashoka heard about this, he visited the monk, and was further impressed by a series of miracles performed by the monk. He then became a Buddhist. A story in the Ashokavadana states that Samudra was a merchant's son, and was a 12-year-old boy when he met Ashoka; this account seems to be influenced by the Nigrodha story. The A-yu-wang-chuan states that a 7-year-old Buddhist converted Ashoka. Another story claims that the young boy ate 500 Brahmanas who were harassing Ashoka for being interested in Buddhism; these Brahmanas later miraculously turned into Buddhist bhikkus at the Kukkutarama monastery, where Ashoka paid a visit. Several Buddhist establishments existed in various parts of India by the time of Ashoka's ascension. It is not clear which branch of the Buddhist sangha influenced him, but the one at his capital Pataliputra is a good candidate. Another good candidate is the one at Mahabodhi: the Major Rock Edict 8 records his visit to the Bodhi Tree – the place of Buddha's enlightenment at Mahabodhi – after his 10th regnal year, and the minor rock edict issued during his 13th regnal year suggests that he had become a Buddhist around the same time. Reign after Buddhist influence Construction of Stupas and Temples Both Mahavamsa and Ashokavadana state that Ashoka constructed 84,000 stupas or viharas. According to the Mahavamsa, this activity took place during his 5th–7th regnal years. The Ashokavadana states that Ashoka collected seven out of the eight relics of Gautama Buddha, and had their portions kept in 84,000 boxes made of gold, silver, cat's eye, and crystal. He ordered the construction of 84,000 stupas throughout the earth, in towns that had a population of 100,000 or more. He told Elder Yashas, a monk at the Kukkutarama monastery, that he wanted these stupas to be completed on the same day. Yashas stated that he would signal the completion time by eclipsing the sun with his hand. When he did so, the 84,000 stupas were completed at once. The Mahavamsa states that Ashoka ordered construction of 84,000 viharas (monasteries) rather than the stupas to house the relics. Like Ashokavadana, the Mahavamsa describes Ashoka's collection of the relics, but does not mention this episode in the context of the construction activities. It states that Ashoka decided to construct the 84,000 viharas when Moggaliputta Tissa told him that there were 84,000 sections of the Buddha's Dhamma. Ashoka himself began the construction of the Ashokarama vihara, and ordered subordinate kings to build the other viharas. Ashokarama was completed by the miraculous power of Thera Indagutta, and the news about the completion of the 84,000 viharas arrived from various cities on the same day. The construction of following stupas and viharas is credited to Ashoka: Sanchi, Madhya Pradesh, India Dhamek Stupa, Sarnath, Uttar Pradesh, India Mahabodhi Temple, Bihar, India Barabar Caves, Bihar, India Nalanda Mahavihara (some portions like Sariputta Stupa), Bihar, India Taxila University (some portions like Dharmarajika Stupa and Kunala Stupa), Taxila, Pakistan Bhir Mound (reconstructed), Taxila, Pakistan Bharhut stupa, Madhya Pradesh, India Deorkothar Stupa, Madhya Pradesh, India Butkara Stupa, Swat, Pakistan Sannati Stupa, Karnataka, India Mir Rukun Stupa, Nawabshah, Pakistan Propagation of dhamma Ashoka's rock edicts suggest that during his 8th–9th regnal years, he made a pilgrimage to the Bodhi Tree, started propagating dhamma, and performed social welfare activities. The welfare activities included establishment of medical treatment facilities for humans and animals; plantation of medicinal herbs; and digging of wells and plantation of trees along the roads. These activities were conducted in the neighbouring kingdoms, including those of the Cholas, the Pandyas, the Satiyaputras, Tamraparni, the Greek kingdom of Antiyoka. The edicts also state that during his 10th–11th regnal years, Ashoka became closer to the Buddhist sangha, and went on a tour of the empire that lasted for at least 256 days. By his 12th regnal year, Ashoka had started inscribing edicts to propagate dhamma, having ordered his officers (rajjukas and pradesikas) to tour their jurisdictions every five years for inspection and for preaching dhamma. By the next year, he had set up the post of the dharma-mahamatra. During his 14th regnal year, he commissioned the enlargement of the stupa of Buddha Kanakamuni. Third Buddhist Council The Sri Lankan tradition presents a greater role for Ashoka in the Buddhist community. In this tradition, Ashoka starts feeding monks on a large scale. His lavish patronage to the state patronage leads to many fake monks joining the sangha. The true Buddhist monks refuse to co-operate with these fake monks, and therefore, no uposatha ceremony is held for seven years. The king attempts to eradicate the fake monks, but during this attempt, an over-zealous minister ends up killing some real monks. The king then invites the elder monk Moggaliputta-Tissa, to help him expel non-Buddhists from the monastery founded by him at Pataliputra. 60,000 monks (bhikkhus) convicted of being heretical are de-frocked in the ensuing process. The uposatha ceremony is then held, and Tissa subsequently organises the Third Buddhist council, during the 17th regnal year of Ashoka. Tissa compiles Kathavatthu, a text that reaffirms Theravadin orthodoxy on several points. The North Indian tradition makes no mention of these events, which has led to doubts about the historicity of the Third Buddihst council. Richard Gombrich argues that the non-corroboration of this story by inscriptional evidence cannot be used to dismiss it as completely unhistorical, as several of Ashoka's inscriptions may have been lost. Gombrich also argues that Asohka's inscriptions prove that he was interested in maintaining the "unanimity and purity" of the Sangha. For example, in his Minor Rock Edict 3, Ashoka recommends the members of the Sangha to study certain texts (most of which remain unidentified). Similarly, in an inscription found at Sanchi, Sarnath, and Kosam, Ashoka mandates that the dissident members of the sangha should be expelled, and expresses his desire to the Sangha remain united and flourish. The 8th century Buddhist pilgrim Yijing records another story about Ashoka's involvement in the Buddhist sangha. According to this story, the earlier king Bimbisara, who was a contemporary of the Gautama Buddha, once saw 18 fragments of a cloth and a stick in a dream. The Buddha interpreted the dream to mean that his philosophy would be divided into 18 schools after his death, and predicted that a king called Ashoka would unite these schools over a hundred years later. Buddhist missions In the Sri Lankan tradition, Moggaliputta-Tissa – who is patronised by Ashoka – sends out nine Buddhist missions to spread Buddhism in the "border areas" in c. 250 BCE. This tradition does not credit Ashoka directly with sending these missions. Each mission comprises five monks, and is headed by an elder. To Sri Lanka, he sent his own son Mahinda, accompanied by four other Theras – Itthiya, Uttiya, Sambala and Bhaddasala. Next, with Moggaliputta-Tissa's help, Ashoka sent Buddhist missionaries to distant regions such as Kashmir, Gandhara, Himalayas, the land of the Yonas (Greeks), Maharashtra, Suvannabhumi, and Sri Lanka. The Sri Lankan tradition dates these missions to Ashoka's 18th regnal year, naming the following missionaries: Mahinda to Sri Lanka Majjhantika to Kashmir and Gandhara Mahadeva to Mahisa-mandala (possibly modern Mysore region) Rakkhita to Vanavasa Dhammarakkhita the Greek to Aparantaka (western India) Maha-dhamma-rakkhita to Maharashtra Maharakkhita to the Greek country Majjhima to the Himalayas Soṇa and Uttara to Suvaṇṇabhūmi (possibly Lower Burma and Thailand) The tradition adds that during his 19th regnal year, Ashoka's daughter Sanghamitta went to Sri Lanka to establish an order of nuns, taking a sapling of the sacred Bodhi Tree with her. The North Indian tradition makes no mention of these events. Ashoka's own inscriptions also appear to omit any mention of these events, recording only one of his activities during this period: in his 19th regnal year, he donated the Khalatika Cave to ascetics to provide them a shelter during the rainy season. Ashoka's Pillar Edicts suggest that during the next year, he made pilgrimage to Lumbini – the place of Buddha's birth, and to the stupa of the Buddha Kanakamuni. The Rock Edict XIII states that Ashoka's won a "dhamma victory" by sending messengers to five kings and several other kingdoms. Whether these missions correspond to the Buddhist missions recorded in the Buddhist chronicles is debated. Indologist Etienne Lamotte argues that the "dhamma" missionaries mentioned in Ashoka's inscriptions were probably not Buddhist monks, as this "dhamma" was not same as "Buddhism". Moreover, the lists of destinations of the missions and the dates of the missions mentioned in the inscriptions do not tally the ones mentioned in the Buddhist legends. Other scholars, such as Erich Frauwallner and Richard Gombrich, believe that the missions mentioned in the Sri Lankan tradition are historical. According to these scholars, a part of this story is corroborated by archaeological evidence: the Vinaya Nidana mentions names of five monks, who are said to have gone to the Himalayan region; three of these names have been found inscribed on relic caskets found at Bhilsa (near Vidisha). These caskets have been dated to the early 2nd century BCE, and the inscription states that the monks are of the Himalayan school. The missions may have set out from Vidisha in central India, as the caskets were discovered there, and as Mahinda is said to have stayed there for a month before setting out for Sri Lanka. According to Gombrich, the mission may have included representatives of other religions, and thus, Lamotte's objection about "dhamma" is not valid. The Buddhist chroniclers may have decided not to mention these non-Buddhists, so as not to sideline Buddhism. Frauwallner and Gombrich also believe that Ashoka was directly responsible for the missions, since only a resourceful ruler could have sponsored such activities. The Sri Lankan chronicles, which belong to the Theravada school, exaggerate the role of the Theravadin monk Moggaliputta-Tissa in order to glorify their sect. Some historians argue that Buddhism became a major religion because of Ashoka's royal patronage. However, epigraphic evidence suggests that the spread of Buddhism in north-western India and Deccan region was less because of Ashoka's missions, and more because of merchants, traders, landowners and the artisan guilds who supported Buddhist establishments. Violence after conversion According to the Ashokavadana, Ashoka resorted to violence even after converting to Buddhism. For example: He slowly tortured Chandagirika to death in the "hell" prison. He ordered a massacre of 18,000 heretics for a misdeed of one. He launched a pogrom against the Jains, announcing a bounty on the head of any heretic; this results in the beheading of his own brother – Vitashoka. According to the Ashokavadana, a non-Buddhist in Pundravardhana drew a picture showing the Buddha bowing at the feet of the Nirgrantha leader Jnatiputra. The term nirgrantha ("free from bonds") was originally used for a pre-Jaina ascetic order, but later came to be used for Jaina monks. "Jnatiputra" is identified with Mahavira, 24th Tirthankara of Jainism. The legend states that on complaint from a Buddhist devotee, Ashoka issued an order to arrest the non-Buddhist artist, and subsequently, another order to kill all the Ajivikas in Pundravardhana. Around 18,000 followers of the Ajivika sect were executed as a result of this order. Sometime later, another Nirgrantha follower in Pataliputra drew a similar picture. Ashoka burnt him and his entire family alive in their house. He also announced an award of one dinara (gold coin) to anyone who brought him the head of a Nirgrantha heretic. According to Ashokavadana, as a result of this order, his own brother was mistaken for a heretic and killed by a cowherd. Ashoka realised his mistake, and withdrew the order. For several reasons, scholars say, these stories of persecutions of rival sects by Ashoka appear to be clear fabrications arising out of sectarian propaganda. Last years Tissarakkha as the queen Ashoka's last dated inscription - the Pillar Edict 4 is from his 26th regnal year. The only source of information about Ashoka's later years are the Buddhist legends. The Sri Lankan tradition states that Ashoka's queen Asandhamitta died during his 29th regnal year, and in his 32nd regnal year, his wife Tissarakkha was given the title of queen. Both Mahavamsa and Ashokavadana state that Ashoka extended favours and attention to the Bodhi Tree, and a jealous Tissarakkha mistook "Bodhi" to be a mistress of Ashoka. She then used black magic to make the tree wither. According to the Ashokavadana, she hired a sorceress to do the job, and when Ashoka explained that "Bodhi" was the name of a tree, she had the sorceress heal the tree. According to the Mahavamsa, she completely destroyed the tree, during Ashoka's 34th regnal year. The Ashokavadana states that Tissarakkha (called "Tishyarakshita" here) made sexual advances towards Ashoka's son Kunala, but Kunala rejected her. Subsequently, Ashoka granted Tissarakkha kingship for seven days, and during this period, she tortured and blinded Kunala. Ashoka then threatened to "tear out her eyes, rip open her body with sharp rakes, impale her alive on a spit, cut off her nose with a saw, cut out her tongue with a razor." Kunala regained his eyesight miraculously, and pleaded for mercy from the queen, but Ashoka had her executed anyway. Kshemendra's Avadana-kalpa-lata also narrates this legend, but seeks to improve Ashoka's image by stating that he forgave the queen after Kunala regained his eyesight. Death According to the Sri Lankan tradition, Ashoka died during his 37th regnal year, which suggests that he died around 232 BCE. According to the Ashokavadana, the emperor fell severely ill during his last days. He started using state funds to make donations to the Buddhist sangha, prompting his ministers to deny him access to the state treasury. Ashoka then started donating his personal possessions, but was similarly restricted from doing so. On his deathbed, his only possession was the half of a myrobalan fruit, which he offered to the sangha as his final donation. Such legends encourage generous donations to the sangha and highlight the role of the kingship in supporting the Buddhist faith. Legend states that during his cremation, his body burned for seven days and nights. Family Queens Various sources mention five consorts of Ashoka: Devi (or Vedisa-Mahadevi-Shakyakumari), Karuvaki, Asandhimitra (Pali: Asandhimitta), Padmavati, and Tishyarakshita (Pali: Tissarakkha). Kaurvaki is the only queen of Ashoka known from his own inscriptions: she is mentioned in an edict inscribed on a pillar at Allahabad. The inscription names her as the mother of prince Tivara, and orders the royal officers (mahamattas) to record her religious and charitable donations. According to one theory, Tishyarakshita was the regnal name of Kaurvaki. According to the Mahavamsa, Ashoka's chief queen was Asandhimitta, who died four years before him. It states that she was born as Ashoka's queen because in a previous life, she directed a pratyekabuddha to a honey merchant (who was later reborn as Ashoka). Some later texts also state that she additionally gave the pratyekabuddha a piece of cloth made by her. These texts include the Dasavatthuppakarana, the so-called Cambodian or Extended Mahavamsa (possibly from 9th–10th centuries), and the Trai Bhumi Katha (15th century). These texts narrate another story: one day, Ashoka mocked Asandhamitta was enjoying a tasty piece of sugarcane without having earned it through her karma. Asandhamitta replied that all her enjoyments resulted from merit resulting from her own karma. Ashoka then challenged her to prove this by procuring 60,000 robes as an offering for monks. At night, the guardian gods informed her about her past gift to the pratyekabuddha, and next day, she was able to miraculously procure the 60,000 robes. An impressed Ashoka makes her his favourite queen, and even offers to make her a sovereign ruler. Asandhamitta refuses the offer, but still invokes the jealousy of Ashoka's 16,000 other women. Ashoka proves her superiority by having 16,000 identical cakes

to the entire world, including the Yaksha territory located above the earth and the Naga territory located below the earth. When Susima returned to the capital, Ashoka's newly appointed prime minister Radhagupta tricked him into a pit of charcoal. Susima died a painful death, and his general Bhadrayudha became a Buddhist monk. The Mahavamsa states that when Bindusara fell sick, Ashoka returned to Pataliputra from Ujjain and gained control of the capital. After his father's death, Ashoka had his eldest brother killed and ascended the throne. The text also states that Ashoka killed ninety-nine of his half-brothers, including Sumana. The Dipavamsa states that he killed a hundred of his brothers and was crowned four years later. The Vamsatthapakasini adds that an Ajivika ascetic had predicted this massacre based on the interpretation of a dream of Ashoka's mother. According to these accounts, only Ashoka's uterine brother Tissa was spared. Other sources name the surviving brother Vitashoka, Vigatashoka, Sudatta (So-ta-to in A-yi-uang-chuan), or Sugatra (Siu-ka-tu-lu in Fen-pie-kung-te-hun). The figures such as 99 and 100 are exaggerated and seem to be a way of stating that Ashoka killed several of his brothers. Taranatha states that Ashoka, who was an illegitimate son of his predecessor, killed six legitimate princes to ascend the throne. It is possible that Ashoka was not the rightful heir to the throne and killed a brother (or brothers) to acquire the throne. However, the Buddhist sources have exaggerated the story, which attempts to portray him as evil before his conversion to Buddhism. Ashoka's Rock Edict No. 5 mentions officers whose duties include supervising the welfare of "the families of his brothers, sisters, and other relatives". This suggests that more than one of his brothers survived his ascension. However, some scholars oppose this suggestion, arguing that the inscription talks only about the families of his brothers, not the brothers themselves. Date of ascension According to the Sri Lankan texts Mahavamsa and the Dipavamsa, Ashoka ascended the throne 218 years after the death of Gautama Buddha and ruled for 37 years. The date of the Buddha's death is itself a matter of debate, and the North Indian tradition states that Ashoka ruled a hundred years after the Buddha's death, which has led to further debates about the date. Assuming that the Sri Lankan tradition is correct, and assuming that the Buddha died in 483 BCE – a date proposed by several scholars – Ashoka must have ascended the throne in 265 BCE. The Puranas state that Ashoka's father Bindusara reigned for 25 years, not 28 years as specified in the Sri Lankan tradition. If this is true, Ashoka's ascension can be dated three years earlier, to 268 BCE. Alternatively, if the Sri Lankan tradition is correct, but if we assume that the Buddha died in 486 BCE (a date supported by the Cantonese Dotted Record), Ashoka's ascension can be dated to 268 BCE. The Mahavamsa states that Ashoka consecrated himself as the king four years after becoming a sovereign. This interregnum can be explained assuming that he fought a war of succession with other sons of Bindusara during these four years. The Ashokavadana contains a story about Ashoka's minister Yashas hiding the sun with his hand. Professor P. H. L. Eggermont theorised that this story was a reference to a partial solar eclipse that was seen in northern India on 4 May 249 BCE. According to the Ashokavadana, Ashoka went on a pilgrimage to various Buddhist sites sometime after this eclipse. Ashoka's Rummindei pillar inscription states that he visited Lumbini during his 21st regnal year. Assuming this visit was a part of the pilgrimage described in the text, and assuming that Ashoka visited Lumbini around 1–2 years after the solar eclipse, the ascension date of 268–269 BCE seems more likely. However, this theory is not universally accepted. For example, according to John S. Strong, the event described in the Ashokavadana has nothing to do with chronology, and Eggermont's interpretation grossly ignores the literary and religious context of the legend. Reign before Buddhist influence Both Sri Lankan and North Indian traditions assert that Ashoka was a violent person before Buddhism. Taranatha also states that Ashoka was initially called "Kamashoka" because he spent many years in pleasurable pursuits (kama); he was then called "Chandashoka" ("Ashoka the fierce") because he spent some years performing evil deeds; and finally, he came to be known as Dhammashoka ("Ashoka the righteous") after his conversion to Buddhism. The Ashokavadana also calls him "Chandashoka", and describes several of his cruel acts: The ministers who had helped him ascend the throne started treating him with contempt after his ascension. To test their loyalty, Ashoka gave them the absurd order of cutting down every flower-and fruit-bearing tree. When they failed to carry out this order, Ashoka personally cut off the heads of 500 ministers. One day, during a stroll at a park, Ashoka and his concubines came across a beautiful Ashoka tree. The sight put him in a sensual mood, but the women did not enjoy caressing his rough skin. Sometime later, when Ashoka fell asleep, the resentful women chopped the flowers and the branches of his namesake tree. After Ashoka woke up, he burnt 500 of his concubines to death as a punishment. Alarmed by the king's involvement in such massacres, prime minister Radha-Gupta proposed hiring an executioner to carry out future mass killings to leave the king unsullied. Girika, a Magadha village boy who boasted that he could execute the whole of Jambudvipa, was hired for the purpose. He came to be known as Chandagirika ("Girika the fierce"), and on his request, Ashoka built a jail in Pataliputra. Called Ashoka's Hell, the jail looked lovely from outside, but inside it, Girika brutally tortured the prisoners. The 5th-century Chinese traveller Faxian states that Ashoka personally visited the underworld to study torture methods there and then invented his methods. The 7th-century traveller Xuanzang claims to have seen a pillar marking the site of Ashoka's "Hell". The Mahavamsa also briefly alludes to Ashoka's cruelty, stating that Ashoka was earlier called Chandashoka because of his evil deeds but came to be called Dharmashoka because of his pious acts after his conversion to Buddhism. However, unlike the north Indian tradition, the Sri Lankan texts do not mention any specific evil deeds performed by Ashoka, except his killing of 99 of his brothers. Such descriptions of Ashoka as an evil person before his conversion to Buddhism appear to be a fabrication of the Buddhist authors, who attempted to present the change that Buddhism brought to him as a miracle. In an attempt to dramatise this change, such legends exaggerate Ashoka's past wickedness and his piousness after the conversion. Kalinga war and conversion to Buddhism Ashoka's inscriptions mention that he conquered the Kalinga region during his 8th regnal year: the destruction caused during the war made him repent violence, and in the subsequent years, he was drawn towards Buddhism. Edict 13 of the Edicts of Ashoka Rock Inscriptions expresses the great remorse the king felt after observing the destruction of Kalinga: On the other hand, the Sri Lankan tradition suggests that Ashoka was already a devoted Buddhist by his 8th regnal year, converted to Buddhism during his 4th regnal year, and constructed 84,000 viharas during his 5th–7th regnal years. The Buddhist legends make no mention of the Kalinga campaign. Based on Sri Lankan tradition, some scholars, such as Eggermont, believe Ashoka converted to Buddhism before the Kalinga war. Critics of this theory argue that if Ashoka were already a Buddhist, he would not have waged the violent Kalinga War. Eggermont explains this anomaly by theorising that Ashoka had his interpretation of the "Middle Way". Some earlier writers believed that Ashoka dramatically converted to Buddhism after seeing the suffering caused by the war since his Major Rock Edict 13 states that he became closer to the dhamma after the annexation of Kalinga. However, even if Ashoka converted to Buddhism after the war, epigraphic evidence suggests that his conversion was a gradual process rather than a dramatic event. For example, in a Minor Rock Edict issued during his 13th regnal year (five years after the Kalinga campaign), he states that he had been an upasaka (lay Buddhist) for more than two and a half years, but did not make much progress; in the past year, he was drawn closer to the sangha and became a more ardent follower. The war According to Ashoka's Major Rock Edict 13, he conquered Kalinga 8 years after ascending to the throne. The edict states that during his conquest of Kalinga, 100,000 men and animals were killed in action; many times that number "perished"; and 150,000 men and animals were carried away from Kalinga as captives. Ashoka states that the repentance of these sufferings caused him to devote himself to the practice and propagation of dharma. He proclaims that he now considered the slaughter, death and deportation caused during the conquest of a country painful and deplorable; and that he considered the suffering caused to the religious people and householders even more deplorable. This edict has been inscribed at several places, including Erragudi, Girnar, Kalsi, Maneshra, Shahbazgarhi and Kandahar. However, it is omitted in Ashoka's inscriptions found in the Kalinga region, where the Rock Edicts 13 and 14 have been replaced by two separate edicts that make no mention of Ashoka's remorse. It is possible that Ashoka did not consider it politically appropriate to make such a confession to the people of Kalinga. Another possibility is the Kalinga war and its consequences, as described in Ashoka's rock edicts, are "more imaginary than real". This description is meant to impress those far removed from the scene, thus unable to verify its accuracy. Ancient sources do not mention any other military activity of Ashoka, although the 16th-century writer Taranatha claims that Ashoka conquered the entire Jambudvipa. First contact with Buddhism Different sources give different accounts of Ashoka's conversion to Buddhism. According to Sri Lankan tradition, Ashoka's father, Bindusara, was a devotee of Brahmanism, and his mother Dharma was a devotee of Ajivikas. The Samantapasadika states that Ashoka followed non-Buddhist sects during the first three years of his reign. The Sri Lankan texts add that Ashoka was not happy with the behaviour of the Brahmins who received his alms daily. His courtiers produced some Ajivika and Nigantha teachers before him, but these also failed to impress him. The Dipavamsa states that Ashoka invited several non-Buddhist religious leaders to his palace and bestowed great gifts upon them in the hope that they would answer a question posed by the king. The text does not state what the question was but mentions that none of the invitees were able to answer it. One day, Ashoka saw a young Buddhist monk called Nigrodha (or Nyagrodha), who was looking for alms on a road in Pataliputra. He was the king's nephew, although the king was not aware of this: he was a posthumous son of Ashoka's eldest brother Sumana, whom Ashoka had killed during the conflict for the throne. Ashoka was impressed by Nigrodha's tranquil and fearless appearance, and asked him to teach him his faith. In response, Nigrodha offered him a sermon on appamada (earnestness). Impressed by the sermon, Ashoka offered Nigrodha 400,000 silver coins and 8 daily portions of rice. The king became a Buddhist upasaka, and started visiting the Kukkutarama shrine at Pataliputra. At the temple, he met the Buddhist monk Moggaliputta Tissa, and became more devoted to the Buddhist faith. The veracity of this story is not certain. This legend about Ashoka's search for a worthy teacher may be aimed at explaining why Ashoka did not adopt Jainism, another major contemporary faith that advocates non-violence and compassion. The legend suggests that Ashoka was not attracted to Buddhism because he was looking for such a faith, rather, for a competent spiritual teacher. The Sri Lankan tradition adds that during his 6th regnal year, Ashoka's son Mahinda became a Buddhist monk, and his daughter became a Buddhist nun. A story in Divyavadana attributes Ashoka's conversion to the Buddhist monk Samudra, who was an ex-merchant from Shravasti. According to this account, Samudra was imprisoned in Ashoka's "Hell", but saved himself using his miraculous powers. When Ashoka heard about this, he visited the monk, and was further impressed by a series of miracles performed by the monk. He then became a Buddhist. A story in the Ashokavadana states that Samudra was a merchant's son, and was a 12-year-old boy when he met Ashoka; this account seems to be influenced by the Nigrodha story. The A-yu-wang-chuan states that a 7-year-old Buddhist converted Ashoka. Another story claims that the young boy ate 500 Brahmanas who were harassing Ashoka for being interested in Buddhism; these Brahmanas later miraculously turned into Buddhist bhikkus at the Kukkutarama monastery, where Ashoka paid a visit. Several Buddhist establishments existed in various parts of India by the time of Ashoka's ascension. It is not clear which branch of the Buddhist sangha influenced him, but the one at his capital Pataliputra is a good candidate. Another good candidate is the one at Mahabodhi: the Major Rock Edict 8 records his visit to the Bodhi Tree – the place of Buddha's enlightenment at Mahabodhi – after his 10th regnal year, and the minor rock edict issued during his 13th regnal year suggests that he had become a Buddhist around the same time. Reign after Buddhist influence Construction of Stupas and Temples Both Mahavamsa and Ashokavadana state that Ashoka constructed 84,000 stupas or viharas. According to the Mahavamsa, this activity took place during his 5th–7th regnal years. The Ashokavadana states that Ashoka collected seven out of the eight relics of Gautama Buddha, and had their portions kept in 84,000 boxes made of gold, silver, cat's eye, and crystal. He ordered the construction of 84,000 stupas throughout the earth, in towns that had a population of 100,000 or more. He told Elder Yashas, a monk at the Kukkutarama monastery, that he wanted these stupas to be completed on the same day. Yashas stated that he would signal the completion time by eclipsing the sun with his hand. When he did so, the 84,000 stupas were completed at once. The Mahavamsa states that Ashoka ordered construction of 84,000 viharas (monasteries) rather than the stupas to house the relics. Like Ashokavadana, the Mahavamsa describes Ashoka's collection of the relics, but does not mention this episode in the context of the construction activities. It states that Ashoka decided to construct the 84,000 viharas when Moggaliputta Tissa told him that there were 84,000 sections of the Buddha's Dhamma. Ashoka himself began the construction of the Ashokarama vihara, and ordered subordinate kings to build the other viharas. Ashokarama was completed by the miraculous power of Thera Indagutta, and the news about the completion of the 84,000 viharas arrived from various cities on the same day. The construction of following stupas and viharas is credited to Ashoka: Sanchi, Madhya Pradesh, India Dhamek Stupa, Sarnath, Uttar Pradesh, India Mahabodhi Temple, Bihar, India Barabar Caves, Bihar, India Nalanda Mahavihara (some portions like Sariputta Stupa), Bihar, India Taxila University (some portions like Dharmarajika Stupa and Kunala Stupa), Taxila, Pakistan Bhir Mound (reconstructed), Taxila, Pakistan Bharhut stupa, Madhya Pradesh, India Deorkothar Stupa, Madhya Pradesh, India Butkara Stupa, Swat, Pakistan Sannati Stupa, Karnataka, India Mir Rukun Stupa, Nawabshah, Pakistan Propagation of dhamma Ashoka's rock edicts suggest that during his 8th–9th regnal years, he made a pilgrimage to the Bodhi Tree, started propagating dhamma, and performed social welfare activities. The welfare activities included establishment of medical treatment facilities for humans and animals; plantation of medicinal herbs; and digging of wells and plantation of trees along the roads. These activities were conducted in the neighbouring kingdoms, including those of the Cholas, the Pandyas, the Satiyaputras, Tamraparni, the Greek kingdom of Antiyoka. The edicts also state that during his 10th–11th regnal years, Ashoka became closer to the Buddhist sangha, and went on a tour of the empire that lasted for at least 256 days. By his 12th regnal year, Ashoka had started inscribing edicts to propagate dhamma, having ordered his officers (rajjukas and pradesikas) to tour their jurisdictions every five years for inspection and for preaching dhamma. By the next year, he had set up the post of the dharma-mahamatra. During his 14th regnal year, he commissioned the enlargement of the stupa of Buddha Kanakamuni. Third Buddhist Council The Sri Lankan tradition presents a greater role for Ashoka in the Buddhist community. In this tradition, Ashoka starts feeding monks on a large scale. His lavish patronage to the state patronage leads to many fake monks joining the sangha. The true Buddhist monks refuse to co-operate with these fake monks, and therefore, no uposatha ceremony is held for seven years. The king attempts to eradicate the fake monks, but during this attempt, an over-zealous minister ends up killing some real monks. The king then invites the elder monk Moggaliputta-Tissa, to help him expel non-Buddhists from the monastery founded by him at Pataliputra. 60,000 monks (bhikkhus) convicted of being heretical are de-frocked in the ensuing process. The uposatha ceremony is then held, and Tissa subsequently organises the Third Buddhist council, during the 17th regnal year of Ashoka. Tissa compiles Kathavatthu, a text that reaffirms Theravadin orthodoxy on several points. The North Indian tradition makes no mention of these events, which has led to doubts about the historicity of the Third Buddihst council. Richard Gombrich argues that the non-corroboration of this story by inscriptional evidence cannot be used to dismiss it as completely unhistorical, as several of Ashoka's inscriptions may have been lost. Gombrich also argues that Asohka's inscriptions prove that he was interested in maintaining the "unanimity and purity" of the Sangha. For example, in his Minor Rock Edict 3, Ashoka recommends the members of the Sangha to study certain texts (most of which remain unidentified). Similarly, in an inscription found at Sanchi, Sarnath, and Kosam, Ashoka mandates that the dissident members of the sangha should be expelled, and expresses his desire to the Sangha remain united and flourish. The 8th century Buddhist pilgrim Yijing records another story about Ashoka's involvement in the Buddhist sangha. According to this story, the earlier king Bimbisara, who was a contemporary of the Gautama Buddha, once saw 18 fragments of a cloth and a stick in a dream. The Buddha interpreted the dream to mean that his philosophy would be divided into 18 schools after his death, and predicted that a king called Ashoka would unite these schools over a hundred years later. Buddhist missions In the Sri Lankan tradition, Moggaliputta-Tissa – who is patronised by Ashoka – sends out nine Buddhist missions to spread Buddhism in the "border areas" in c. 250 BCE. This tradition does not credit Ashoka directly with sending these missions. Each mission comprises five monks, and is headed by an elder. To Sri Lanka, he sent his own son Mahinda, accompanied by four other Theras – Itthiya, Uttiya, Sambala and Bhaddasala. Next, with Moggaliputta-Tissa's help, Ashoka sent Buddhist missionaries to distant regions such as Kashmir, Gandhara, Himalayas, the land of the Yonas (Greeks), Maharashtra, Suvannabhumi, and Sri Lanka. The Sri Lankan tradition dates these missions to Ashoka's 18th regnal year, naming the following missionaries: Mahinda to Sri Lanka Majjhantika to Kashmir and Gandhara Mahadeva to Mahisa-mandala (possibly modern Mysore region) Rakkhita to Vanavasa Dhammarakkhita the Greek to Aparantaka (western India) Maha-dhamma-rakkhita to Maharashtra Maharakkhita to the Greek country Majjhima to the Himalayas Soṇa and Uttara to Suvaṇṇabhūmi (possibly Lower Burma and Thailand) The tradition adds that during his 19th regnal year, Ashoka's daughter Sanghamitta went to Sri Lanka to establish an order of nuns, taking a sapling of the sacred Bodhi Tree with her. The North Indian tradition makes no mention of these events. Ashoka's own inscriptions also appear to omit any mention of these events, recording only one of his activities during this period: in his 19th regnal year, he donated the Khalatika Cave to ascetics to provide them a shelter during the rainy season. Ashoka's Pillar Edicts suggest that during the next year, he made pilgrimage to Lumbini – the place of Buddha's birth, and to the stupa of the Buddha Kanakamuni. The Rock Edict XIII states that Ashoka's won a "dhamma victory" by sending messengers to five kings and several other kingdoms. Whether these missions correspond to the Buddhist missions recorded in the Buddhist chronicles is debated. Indologist Etienne Lamotte argues that the "dhamma" missionaries mentioned in Ashoka's inscriptions were probably not Buddhist monks, as this "dhamma" was not same as "Buddhism". Moreover, the lists of destinations of the missions and the dates of the missions mentioned in the inscriptions do not tally the ones mentioned in the Buddhist legends. Other scholars, such as Erich Frauwallner and Richard Gombrich, believe that the missions mentioned in the Sri Lankan tradition are historical. According to these scholars, a part of this story is corroborated by archaeological evidence: the Vinaya Nidana mentions names of five monks, who are said to have gone to the Himalayan region; three of these names have been found inscribed on relic caskets found at Bhilsa (near Vidisha). These caskets have been dated to the early 2nd century BCE, and the inscription states that the monks are of the Himalayan school. The missions may have set out from Vidisha in central India, as the caskets were discovered there, and as Mahinda is said to have stayed there for a month before setting out for Sri Lanka. According to Gombrich, the mission may have included representatives of other religions, and thus, Lamotte's objection about "dhamma" is not valid. The Buddhist chroniclers may have decided not to mention these non-Buddhists, so as not to sideline Buddhism. Frauwallner and Gombrich also believe that Ashoka was directly responsible for the missions, since only a resourceful ruler could have sponsored such activities. The Sri Lankan chronicles, which belong to the Theravada school, exaggerate the role of the Theravadin monk Moggaliputta-Tissa in order to glorify their sect. Some historians argue that Buddhism became a major religion because of Ashoka's royal patronage. However, epigraphic evidence suggests that the spread of Buddhism in north-western India and Deccan region was less because of Ashoka's missions, and more because of merchants, traders, landowners and the artisan guilds who supported Buddhist establishments. Violence after conversion According to the Ashokavadana, Ashoka resorted to violence even after converting to Buddhism. For example: He slowly tortured Chandagirika to death in the "hell" prison. He ordered a massacre of 18,000 heretics for a misdeed of one. He launched a pogrom against the Jains, announcing a bounty on the head of any heretic; this results in the beheading of his own brother – Vitashoka. According to the Ashokavadana, a non-Buddhist in Pundravardhana drew a picture showing the Buddha bowing at the feet of the Nirgrantha leader Jnatiputra. The term nirgrantha ("free from bonds") was originally used for a pre-Jaina ascetic order, but later came to be used for Jaina monks. "Jnatiputra" is identified with Mahavira, 24th Tirthankara of Jainism. The legend states that on complaint from a Buddhist devotee, Ashoka issued an order to arrest the non-Buddhist artist, and subsequently, another order to kill all the Ajivikas in Pundravardhana. Around 18,000 followers of the Ajivika sect were executed as a result of this order. Sometime later, another Nirgrantha follower in Pataliputra drew a similar picture. Ashoka burnt him and his entire family alive in their house. He also announced an award of one dinara (gold coin) to anyone who brought him the head of a Nirgrantha heretic. According to Ashokavadana, as a result of this order, his own brother was mistaken for a heretic and killed by a cowherd. Ashoka realised his mistake, and withdrew the order. For several reasons, scholars say, these stories of persecutions of rival sects by Ashoka appear to be clear fabrications arising out of sectarian propaganda. Last years Tissarakkha as the queen Ashoka's last dated inscription - the Pillar Edict 4 is from his 26th regnal year. The only source of information about Ashoka's later years are the Buddhist legends.

form refers to the continents, and would be an inhabitant thereof. Likewise, the Esperanto word refers to the continents. For the country there is the term . Thus, a citizen of the United States is an , whereas an is an inhabitant of the Americas. History The name America was coined by Martin Waldseemüller from Americus Vespucius, the Latinized version of the name of Amerigo Vespucci (1454–1512), the Italian explorer who mapped South America's east coast and the Caribbean Sea in the early 16th century. Later, Vespucci's published letters were the basis of Waldseemüller's 1507 map, which is the first usage of America. The adjective American subsequently denoted the New World. 16th-century European usage of American denoted the native inhabitants of the New World. The earliest recorded use of this term in English is in Thomas Hacket's 1568 translation of André Thévet's book France Antarctique; Thévet himself had referred to the natives as Ameriques. In the following century, the term was extended to European settlers and their descendants in the Americas. The earliest recorded use of "English-American" dates to 1648, in Thomas Gage's The English-American his travail by sea and land: or, a new survey of the West India's. In English, American was used especially for people in British America. Samuel Johnson, the leading English lexicographer, wrote in 1775, before the United States declared independence: "That the Americans are able to bear taxation is indubitable." The Declaration of Independence of July 1776 refers to "[the] unanimous Declaration of the thirteen United States of America" adopted by the "Representatives of the United States of America" on July 4, 1776. The official name of the country was reaffirmed on November 15, 1777, when the Second Continental Congress adopted the Articles of Confederation, the first of which says, "The Stile of this Confederacy shall be 'The United States of America'". The Articles further state: Thomas Jefferson, newly elected president in May 1801 wrote, "I am sure the measures I mean to pursue are such as would in their nature be approved by every American who can emerge from preconceived prejudices; as for those who cannot, we must take care of them as of the sick in our hospitals. The medicine of time and fact may cure some of them." In The Federalist Papers (1787–88), Alexander Hamilton and James Madison used the adjective American with two different meanings: one political and one geographic; "the American republic" in Federalist No. 51 and in Federalist No. 70, and, in Federalist No. 24, Hamilton used American to denote the lands beyond the U.S.'s political borders. Early official U.S. documents show inconsistent usage; the 1778 Treaty of Alliance with France used "the United States of North America" in the first sentence, then "the said United States" afterwards; "the United States of America" and "the United States of North America" derive from "the United Colonies of America" and "the United Colonies of North America". The Treaty of Peace and Amity of September 5, 1795, between the United States and the Barbary States contains the usages "the United States of North America", "citizens of the United States", and "American Citizens". U.S. President George Washington, in his 1796 Farewell Address, declaimed that "The name of American, which belongs to you in your national capacity, must always exalt the just pride of patriotism more than any appellation." Political scientist Virginia L. Arbery notes that, in his Farewell Address: "...Washington invites his fellow citizens to view themselves now as Americans who, out of their love for the truth of liberty, have replaced their maiden names (Virginians, South Carolinians, New Yorkers, etc.) with that of “American”. Get rid of, he urges, “any appellation derived from local discriminations.” By defining himself as an American rather than as a Virginian, Washington set the national standard for all citizens. "Over and over, Washington said that America must be something set apart. As he put it to Patrick Henry, 'In a word, I want an American character, that the powers of Europe may be convinced we act for ourselves and not for others.'" As the historian Garry Wills has noted: "This was a theme dear to Washington. He wrote to Timothy Pickering that the nation 'must never forget that we are Americans; the remembrance of which will convince us we ought not to be French or English'." Washington's countrymen subsequently embraced his exhortation with notable enthusiasm. This semantic divergence among North American anglophones, however, remained largely unknown in the Spanish-American colonies. In 1801, the document titled Letter to American Spaniards—published in French (1799), in Spanish (1801), and in English (1808)—might have influenced Venezuela's Act of Independence and its 1811 constitution. The Latter-day Saints' Articles of Faith refer to the American continents as where they are to build Zion. Common short forms and abbreviations are the United States, the U.S., the U.S.A., and America; colloquial versions include the U.S. of A. and the States. The term Columbia (from the Columbus surname) was a popular name for the U.S. and for the entire geographic Americas; its usage is present today in the District of Columbia's name. Moreover, the womanly personification of Columbia appears in some official documents, including editions of the U.S. dollar. Usage at the United Nations Use of the term American for U.S. nationals is common at the United Nations, and financial markets in the United States are referred to as "American financial markets". American Samoa is a recognized territorial name at the United Nations. Cultural views Spain and Hispanic America The use of American as a national demonym for U.S. nationals is challenged, primarily by Hispanic Americans. Spanish speakers in Spain and Latin America use the term to refer to people and things from the United States (from ), while refers to the continents as a whole. The term is also accepted in many parts of Latin America to refer to a person or something from the United States; however, this term may be ambiguous in certain parts. Up to and including the 1992 edition, the , published by the Real Academia Española, did not include the United States definition in the entry for ; this was added in the 2001 edition. The Real Academia Española advised against using exclusively for U.S. nationals: Canada Modern Canadians typically refer to people from the United States as Americans, though they seldom refer to the United States as America; they use the terms the United States, the U.S., or (informally) the States instead. Rarely applying the term American to themselves, some Canadians resent being referred to as Americans or mistaken for U.S. citizens. This is often due to others' inability, particularly overseas, to distinguish Canadians from Americans, by their accent or other cultural attributes. Some Canadians have protested the use of American as a national demonym. People of U.S. ethnic origin in Canada are categorized as "Other North American origins" by Statistics Canada for purposes of census counts. Portugal and Brazil Generally, denotes "U.S. citizen" in Portugal. Usage of to exclusively denote people and things of the U.S. is discouraged by the Lisbon Academy of Sciences, because the specific word (also ) clearly denotes a person from the United States. The term currently used by the Portuguese press is . In Brazil, the term is used to address both that which pertains to both American continents and, in current speech, that which pertains to the U.S.; the particular meaning is deduced from context. Alternatively, the term ("North American") is also used in more informal contexts, while (of the U.S.) is the preferred form in academia. Use of the three terms is common in schools, government, and media. The term is used almost exclusively for the whole continent, and

Presley was an American singer" or "the man prefers American English". In its noun form, the word generally means a resident or citizen of the US, but is also used for someone whose ethnic identity is simply "American". The noun is rarely used in English to refer to people not connected to the United States when intending a geographical meaning. When used with a grammatical qualifier, the adjective American can mean "of or relating to the Americas", as in Latin American or Indigenous American. Less frequently, the adjective can take this meaning without a qualifier, as in "American Spanish dialects and pronunciation differ by country", or the name of the Organization of American States. A third use of the term pertains specifically to the indigenous peoples of the Americas, for instance, "In the 16th century, many Americans died from imported diseases during the European conquest", though this usage is rare, as "indigenous", "First Nations" or "Amerindian" are considered less confusing and generally more appropriate. Compound constructions which indicate a minority ethnic group, such as "African-Americans" likewise refer exclusively to people in or from the United States of America, as does the prefix "Americo-". For instance, the Americo-Liberians and their language Merico derive their name from the fact that they are descended from African-American settlers, i.e. Blacks who were formerly enslaved in the United States of America. Other languages French, German, Italian, Japanese, Hebrew, Arabic, and Russian speakers may use cognates of American to refer to inhabitants of the Americas or to U.S. nationals. They generally have other terms specific to U.S. nationals, such as the German , French , Japanese , and Italian . These specific terms may be less common than the term American. In French, , or , from ("United States of America"), is a rarely used word that distinguishes U.S. things and persons from the adjective , which denotes persons and things from the United States, but may also refer to "the Americas". Likewise, German's use of and observe said cultural distinction, solely denoting U.S. things and people. Note that in normal parlance, the adjective "American" and its direct cognates are usually used if the context renders the nationality of the person clear. This differentiation is prevalent in German-speaking countries, as indicated by the style manual of the Neue Zürcher Zeitung (one of the leading German-language newspapers in Switzerland) which dismisses the term as both ′unnecessary′ and ′artificial′ and recommends replacing it with amerikanisch. The respective guidelines of the foreign ministries of Austria, Germany and Switzerland all prescribe Amerikaner and amerikanisch in reference to the United States for official usage, making no mention of or . Portuguese has , denoting both a person or thing from the Americas and a U.S. national. For referring specifically to a U.S. national and things, some words used are (also spelled , "United States person"), from , and ("Yankee")—both usages exist in Brazil, but are uncommon in Portugal—but the term most often used, and the only one in Portugal, is , even though it could, as with its Spanish equivalent, apply to Canadians and Mexicans as well. In Spanish, denotes geographic and cultural origin in the New World, as well as (infrequently) a U.S. citizen; the more common term is ("United States person"), which derives from ("United States of America"). The Spanish term ("North American") is frequently used to refer things and persons from the United States, but this term can also denote people and things from Canada and Mexico. Among Spanish-speakers, North America generally doesn't include Central America or the Caribbean. In other languages, however, there is no possibility for confusion. For example, the Chinese word for "U.S. national" is () is derived from a word for the United States, , where is an abbreviation for Yàměilìjiā ("America") and is "country". The name for the American continents is , from plus ("continent"). Thus, a is an American in the continent sense, and a is an American in the U.S. sense. Conversely, in Czech, there is no possibility for disambiguation. Američan (m.) and američanka (f.) can refer to persons from the United States or from the continents of the Americas, and there is no specific word capable of distinguishing the two meanings. For this reason, the latter meaning is very rarely used, and word is used almost exclusively to refer to persons from the United States. The usage is exactly parallel to the English word. Korean and Vietnamese also use unambiguous terms, with Korean having () for the country versus () for the continents, and Vietnamese having for the country versus for the continents. Japanese has such terms as well ( [ versus []), but they are found more in newspaper headlines than in speech, where predominates. In Swahili, means specifically the United States, and is a U.S. national, whereas the international form refers to the continents, and would be an inhabitant thereof. Likewise, the Esperanto word refers to the continents. For the country there is the term . Thus, a citizen of the United States is an , whereas an is an inhabitant of the Americas. History The name America was coined by Martin Waldseemüller from Americus Vespucius, the Latinized version of the name of Amerigo Vespucci (1454–1512), the Italian explorer who mapped South America's east coast and the Caribbean Sea in the early 16th century. Later, Vespucci's published letters were the basis of Waldseemüller's 1507 map, which is the first usage of America. The adjective American subsequently denoted the New World. 16th-century European usage of American denoted the native inhabitants of the New World. The earliest recorded use of this term in English is in Thomas Hacket's 1568 translation of André Thévet's book France Antarctique; Thévet himself had referred to the natives as Ameriques. In the following century, the term was extended to European settlers and their descendants in the Americas. The earliest recorded use of "English-American" dates to 1648, in Thomas Gage's The English-American his travail by sea and land: or, a new survey of the West India's.

working group, the High Order Language Working Group (HOLWG), was formed with the intent to reduce this number by finding or creating a programming language generally suitable for the department's and the UK Ministry of Defence's requirements. After many iterations beginning with an original Straw man proposal the eventual programming language was named Ada. The total number of high-level programming languages in use for such projects fell from over 450 in 1983 to 37 by 1996. The HOLWG working group crafted the Steelman language requirements, a series of documents stating the requirements they felt a programming language should satisfy. Many existing languages were formally reviewed, but the team concluded in 1977 that no existing language met the specifications. Requests for proposals for a new programming language were issued and four contractors were hired to develop their proposals under the names of Red (Intermetrics led by Benjamin Brosgol), Green (CII Honeywell Bull, led by Jean Ichbiah), Blue (SofTech, led by John Goodenough) and Yellow (SRI International, led by Jay Spitzen). In April 1978, after public scrutiny, the Red and Green proposals passed to the next phase. In May 1979, the Green proposal, designed by Jean Ichbiah at CII Honeywell Bull, was chosen and given the name Ada—after Augusta Ada, Countess of Lovelace. This proposal was influenced by the language LIS that Ichbiah and his group had developed in the 1970s. The preliminary Ada reference manual was published in ACM SIGPLAN Notices in June 1979. The Military Standard reference manual was approved on December 10, 1980 (Ada Lovelace's birthday), and given the number MIL-STD-1815 in honor of Ada Lovelace's birth year. In 1981, C. A. R. Hoare took advantage of his Turing Award speech to criticize Ada for being overly complex and hence unreliable, but subsequently seemed to recant in the foreword he wrote for an Ada textbook. Ada attracted much attention from the programming community as a whole during its early days. Its backers and others predicted that it might become a dominant language for general purpose programming and not only defense-related work. Ichbiah publicly stated that within ten years, only two programming languages would remain: Ada and Lisp. Early Ada compilers struggled to implement the large, complex language, and both compile-time and run-time performance tended to be slow and tools primitive. Compiler vendors expended most of their efforts in passing the massive, language-conformance-testing, government-required "ACVC" validation suite that was required in another novel feature of the Ada language effort. The Jargon File, a dictionary of computer hacker slang originating in 1975–1983, notes in an entry on Ada that "it is precisely what one might expect given that kind of endorsement by fiat; designed by committee...difficult to use, and overall a disastrous, multi-billion-dollar boondoggle...Ada Lovelace...would almost certainly blanch at the use her name has been latterly put to; the kindest thing that has been said about it is that there is probably a good small language screaming to get out from inside its vast, elephantine bulk." The first validated Ada implementation was the NYU Ada/Ed translator, certified on April 11, 1983. NYU Ada/Ed is implemented in the high-level set language SETL. Several commercial companies began offering Ada compilers and associated development tools, including Alsys, TeleSoft, DDC-I, Advanced Computer Techniques, Tartan Laboratories, Irvine Compiler, TLD Systems, and Verdix. In 1991, the US Department of Defense began to require the use of Ada (the Ada mandate) for all software, though exceptions to this rule were often granted. The Department of Defense Ada mandate was effectively removed in 1997, as the DoD began to embrace commercial off-the-shelf (COTS) technology. Similar requirements existed in other NATO countries: Ada was required for NATO systems involving command and control and other functions, and Ada was the mandated or preferred language for defense-related applications in countries such as Sweden, Germany, and Canada. By the late 1980s and early 1990s, Ada compilers had improved in performance, but there were still barriers to fully exploiting Ada's abilities, including a tasking model that was different from what most real-time programmers were used to. Because of Ada's safety-critical support features, it is now used not only for military applications, but also in commercial projects where a software bug can have severe consequences, e.g., avionics and air traffic control, commercial rockets such as the Ariane 4 and 5, satellites and other space systems, railway transport and banking. For example, the Airplane Information Management System, the fly-by-wire system software in the Boeing 777, was written in Ada. Developed by Honeywell Air Transport Systems in collaboration with consultants from DDC-I, it became arguably the best-known of any Ada project, civilian or military. The Canadian Automated Air Traffic System was written in 1 million lines of Ada (SLOC count). It featured advanced distributed processing, a distributed Ada database, and object-oriented design. Ada is also used in other air traffic systems, e.g., the UK's next-generation Interim Future Area Control Tools Support (iFACTS) air traffic control system is designed and implemented using SPARK Ada. It is also used in the French TVM in-cab signalling system on the TGV high-speed rail system, and the metro suburban trains in Paris, London, Hong Kong and New York City. Standardization The language became an ANSI standard in 1983 (ANSI/MIL-STD 1815A), and after translation in French and without any further changes in English became an ISO standard in 1987 (ISO-8652:1987). This version of the language is commonly known as Ada 83, from the date of its adoption by ANSI, but is sometimes referred to also as Ada 87, from the date of its adoption by ISO. Ada 95, the joint ISO/ANSI standard (ISO-8652:1995) was published in February 1995, making Ada 95 the first ISO standard object-oriented programming language. To help with the standard revision and future acceptance, the US Air Force funded the development of the GNAT Compiler. Presently, the GNAT Compiler is part of the GNU Compiler Collection. Work has continued on improving and updating the technical content of the Ada language. A Technical Corrigendum to Ada 95 was published in October 2001, and a major Amendment, ISO/IEC 8652:1995/Amd 1:2007 was published on March 9, 2007. At the Ada-Europe 2012 conference in Stockholm, the Ada Resource Association (ARA) and Ada-Europe announced the completion of the design of the latest version of the Ada language and the submission of the reference manual to the International Organization for Standardization (ISO) for approval. ISO/IEC 8652:2012 was published in December 2012. Other related standards include ISO 8651-3:1988 Information processing systems—Computer graphics—Graphical Kernel System (GKS) language bindings—Part 3: Ada. Language constructs Ada is an ALGOL-like programming language featuring control structures with reserved words such as if, then, else, while, for, and so on. However, Ada also has many data structuring facilities and other abstractions which were not included in the original ALGOL 60, such as type definitions, records, pointers, enumerations. Such constructs were in part inherited from or inspired by Pascal. "Hello, world!" in Ada A common example of a language's syntax is the Hello world program: (hello.adb) with Ada.Text_IO; use Ada.Text_IO; procedure Hello is begin Put_Line ("Hello, world!"); end Hello; This program can be compiled by using the freely available open source compiler GNAT, by executing gnatmake hello.adb Data types Ada's type system is not based on a set of predefined primitive types but allows users to declare their own types. This declaration in turn is not based on the internal representation of the type but on describing the goal which should be achieved. This allows the compiler to determine a suitable memory size for the type, and to check for violations of the type definition at compile time and run time (i.e., range violations, buffer overruns, type consistency, etc.). Ada supports numerical types defined by a range, modulo types, aggregate types (records and arrays), and enumeration types. Access types define a reference to an instance of a specified type; untyped pointers are not permitted. Special types provided by the language are task types and protected types. For example, a date might be represented as: type Day_type is range 1 .. 31; type Month_type is range 1 .. 12; type Year_type is range 1800 .. 2100; type Hours is mod 24; type Weekday is (Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday); type Date is record Day : Day_type; Month : Month_type; Year : Year_type; end

the use her name has been latterly put to; the kindest thing that has been said about it is that there is probably a good small language screaming to get out from inside its vast, elephantine bulk." The first validated Ada implementation was the NYU Ada/Ed translator, certified on April 11, 1983. NYU Ada/Ed is implemented in the high-level set language SETL. Several commercial companies began offering Ada compilers and associated development tools, including Alsys, TeleSoft, DDC-I, Advanced Computer Techniques, Tartan Laboratories, Irvine Compiler, TLD Systems, and Verdix. In 1991, the US Department of Defense began to require the use of Ada (the Ada mandate) for all software, though exceptions to this rule were often granted. The Department of Defense Ada mandate was effectively removed in 1997, as the DoD began to embrace commercial off-the-shelf (COTS) technology. Similar requirements existed in other NATO countries: Ada was required for NATO systems involving command and control and other functions, and Ada was the mandated or preferred language for defense-related applications in countries such as Sweden, Germany, and Canada. By the late 1980s and early 1990s, Ada compilers had improved in performance, but there were still barriers to fully exploiting Ada's abilities, including a tasking model that was different from what most real-time programmers were used to. Because of Ada's safety-critical support features, it is now used not only for military applications, but also in commercial projects where a software bug can have severe consequences, e.g., avionics and air traffic control, commercial rockets such as the Ariane 4 and 5, satellites and other space systems, railway transport and banking. For example, the Airplane Information Management System, the fly-by-wire system software in the Boeing 777, was written in Ada. Developed by Honeywell Air Transport Systems in collaboration with consultants from DDC-I, it became arguably the best-known of any Ada project, civilian or military. The Canadian Automated Air Traffic System was written in 1 million lines of Ada (SLOC count). It featured advanced distributed processing, a distributed Ada database, and object-oriented design. Ada is also used in other air traffic systems, e.g., the UK's next-generation Interim Future Area Control Tools Support (iFACTS) air traffic control system is designed and implemented using SPARK Ada. It is also used in the French TVM in-cab signalling system on the TGV high-speed rail system, and the metro suburban trains in Paris, London, Hong Kong and New York City. Standardization The language became an ANSI standard in 1983 (ANSI/MIL-STD 1815A), and after translation in French and without any further changes in English became an ISO standard in 1987 (ISO-8652:1987). This version of the language is commonly known as Ada 83, from the date of its adoption by ANSI, but is sometimes referred to also as Ada 87, from the date of its adoption by ISO. Ada 95, the joint ISO/ANSI standard (ISO-8652:1995) was published in February 1995, making Ada 95 the first ISO standard object-oriented programming language. To help with the standard revision and future acceptance, the US Air Force funded the development of the GNAT Compiler. Presently, the GNAT Compiler is part of the GNU Compiler Collection. Work has continued on improving and updating the technical content of the Ada language. A Technical Corrigendum to Ada 95 was published in October 2001, and a major Amendment, ISO/IEC 8652:1995/Amd 1:2007 was published on March 9, 2007. At the Ada-Europe 2012 conference in Stockholm, the Ada Resource Association (ARA) and Ada-Europe announced the completion of the design of the latest version of the Ada language and the submission of the reference manual to the International Organization for Standardization (ISO) for approval. ISO/IEC 8652:2012 was published in December 2012. Other related standards include ISO 8651-3:1988 Information processing systems—Computer graphics—Graphical Kernel System (GKS) language bindings—Part 3: Ada. Language constructs Ada is an ALGOL-like programming language featuring control structures with reserved words such as if, then, else, while, for, and so on. However, Ada also has many data structuring facilities and other abstractions which were not included in the original ALGOL 60, such as type definitions, records, pointers, enumerations. Such constructs were in part inherited from or inspired by Pascal. "Hello, world!" in Ada A common example of a language's syntax is the Hello world program: (hello.adb) with Ada.Text_IO; use Ada.Text_IO; procedure Hello is begin Put_Line ("Hello, world!"); end Hello; This program can be compiled by using the freely available open source compiler GNAT, by executing gnatmake hello.adb Data types Ada's type system is not based on a set of predefined primitive types but allows users to declare their own types. This declaration in turn is not based on the internal representation of the type but on describing the goal which should be achieved. This allows the compiler to determine a suitable memory size for the type, and to check for violations of the type definition at compile time and run time (i.e., range violations, buffer overruns, type consistency, etc.). Ada supports numerical types defined by a range, modulo types, aggregate types (records and arrays), and enumeration types. Access types define a reference to an instance of a specified type; untyped pointers are not permitted. Special types provided by the language are task types and protected types. For example, a date might be represented as: type Day_type is range 1 .. 31; type Month_type is range 1 .. 12; type Year_type is range 1800 .. 2100; type Hours is mod 24; type Weekday is (Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday); type Date is record Day : Day_type; Month : Month_type; Year : Year_type; end record; Types can be refined by declaring subtypes: subtype Working_Hours is Hours range 0 .. 12; -- at most 12 Hours to work a day subtype Working_Day is Weekday range Monday .. Friday; -- Days to work Work_Load: constant array(Working_Day) of Working_Hours -- implicit type declaration := (Friday => 6, Monday => 4, others => 10); -- lookup table for working hours with initialization Types can have modifiers such as limited, abstract, private etc. Private types can only be accessed and limited types can only be modified or copied within the scope of the package that defines them. Ada 95 adds further features for object-oriented extension of types. Control structures Ada is a structured programming language, meaning that the flow of control is structured into standard statements. All standard constructs and deep-level early exit are supported, so the use of the also supported "go to" commands is seldom needed. -- while a is not equal to b, loop. while a /= b loop Ada.Text_IO.Put_Line ("Waiting"); end loop; if a > b then Ada.Text_IO.Put_Line ("Condition met"); else Ada.Text_IO.Put_Line ("Condition not met"); end if; for i in 1 .. 10 loop Ada.Text_IO.Put ("Iteration: "); Ada.Text_IO.Put (i); Ada.Text_IO.Put_Line; end loop; loop a := a + 1; exit when a = 10; end loop; case i is when 0 => Ada.Text_IO.Put ("zero"); when 1 => Ada.Text_IO.Put ("one"); when 2 => Ada.Text_IO.Put ("two"); -- case statements have to cover all possible cases: when others => Ada.Text_IO.Put ("none of the above"); end case; for aWeekday in Weekday'Range loop -- loop over an enumeration Put_Line ( Weekday'Image(aWeekday) ); -- output string representation of an enumeration if aWeekday in Working_Day then -- check of a subtype of an enumeration Put_Line ( " to work for " & Working_Hours'Image (Work_Load(aWeekday)) ); -- access into a lookup table end if; end loop; Packages, procedures and functions Among the parts of an Ada program are packages, procedures and functions. Example: Package specification (example.ads) package Example is type Number is range 1 .. 11; procedure Print_and_Increment (j: in out Number); end Example; Package body (example.adb) with Ada.Text_IO; package body Example is i : Number := Number'First; procedure Print_and_Increment (j: in out Number) is function Next (k: in Number) return Number is begin return k + 1; end Next; begin Ada.Text_IO.Put_Line ( "The total is: " & Number'Image(j) ); j := Next (j); end Print_and_Increment; -- package initialization executed when the package is elaborated begin while i < Number'Last loop Print_and_Increment (i); end loop; end Example; This program can be compiled, e.g., by using the freely available open-source compiler GNAT, by executing gnatmake -z example.adb Packages, procedures and functions can nest to any depth, and each can also be the logical outermost block. Each package, procedure or function can have its own declarations of constants, types, variables, and other procedures, functions and packages, which can be declared in any order. Concurrency Ada has language support for task-based concurrency. The fundamental concurrent unit in Ada is a task, which is a built-in limited type. Tasks are specified in two parts – the task declaration defines the task interface (similar to a type declaration), the task body specifies the implementation of the task. Depending on the implementation, Ada tasks are either mapped to operating system threads or processes, or are scheduled internally by the Ada runtime. Tasks can have entries for synchronisation (a form of synchronous message passing). Task entries are declared in the task specification. Each task entry can have one or more accept statements within the task body. If the control flow of the task reaches an accept statement, the task is blocked until the corresponding entry is called by another task (similarly, a calling task is blocked until the called task reaches the corresponding accept statement). Task entries can have parameters similar

a science fiction/fantasy/adventure series that was broadcast as part of the 2013–14 United States network television schedule on NBC as a mid-season entry. The series was created by Cuarón for Bad Robot Productions and Warner Bros. Television. In 2014, Time placed him in its list of "100 Most Influential People in the World" – Pioneers. In May 2015, Cuarón was announced as the President of the Jury for the 72nd Venice International Film Festival. Production began in fall 2016 for Cuarón's eighth film, Roma, a tale of a housekeeper for a middle class Mexican family in 1970s Mexico City, based on the life of his family's longtime maid, Liboria Rodríguez. The project was produced by Cuarón, Gabriela Rodríguez and Nicolás Celis and starred Yalitza Aparicio and Marina de Tavira both of whom received Oscar nominations. The film debuted at 75th Venice International Film Festival, where it won the Golden Lion, and was distributed to select Mexican and American theaters before its online release on Netflix. Roma was highly acclaimed upon release; among its accolades are two Golden Globes (Best Foreign Language Film and Best Director for Cuarón) and three Academy Awards (Best Director, Best Foreign Language Film, and Best Cinematography for Cuarón) out of a leading ten nominations. In 2019, Cuaron signed an overall TV deal at Apple. His first TV show under an overall deal with Apple was the show Disclaimer, which was to star Cate Blanchett and Kevin Kline. Style Cuarón's films seem to seep with his many signature visual, thematic, and structural elements. Most notable is the director's use of long takes and his constantly moving camera. These tendencies create the feeling of real time and real space within the worlds that Cuarón explores in his films. Elaborating on this the director states, "For Children of Men, we wanted to take advantage of the element of real time. It's a documentary approach. As if you were just following characters around with your own digital camera in the year 2027." This documentary approach grounds the sometimes fantastical and otherworldly settings the director traverses in films such as Harry Potter and the Prisoner of Azkaban and Gravity. In his films, camera movement acts as an extension of character emotion. Whether employing handheld, steadicam or robotic arm, Cuarón uses the tools of cinematography to create an intense, symbiotic relationship between viewer and onscreen action. Personal life Cuarón is a vegetarian and has been living in London since 2000. Cuarón's first marriage was to Mariana Elizondo with whom he has a son, Jonás Cuarón, born in 1981. Jonás Cuarón is also a film director, known for Year of the Nail and Desierto. Alfonso Cuarón's second marriage, from 2001 to 2008 was to Italian actress and freelance journalist Annalisa Bugliani, with whom he has two children. He has publicly shown his fascination for the Esperanto language and his support for the Esperanto movement. He called his production company Esperanto Filmoj. In 2009, Cuarón signed a petition which called for the release of film director Roman Polanski, who was arrested in Switzerland in relation to his 1977 charge for drugging and raping a 13-year-old girl. Filmography Awards and nominations See also Esperanto Filmoj Cha Cha Cha Films Cinema of Mexico List of Academy Award records Notes References External links Alfonso Cuarón: A Life in Pictures, BAFTA webcast, 27 July 2007 1961 births Living people Best Cinematographer Academy Award winners Best Cinematography BAFTA Award winners Best Directing Academy Award winners Best Director AACTA International Award winners Best Director BAFTA Award winners Best Director Golden Globe winners Best Film Editing Academy Award winners Directors Guild of America Award winners Directors of Best Foreign Language Film Academy

studied philosophy at the National Autonomous University of Mexico (UNAM) and filmmaking at CUEC (Centro Universitario de Estudios Cinematográficos), a school within the same university. There he met the director Carlos Marcovich and cinematographer Emmanuel Lubezki, and they made what would be his first short film, Vengeance Is Mine. Career 1990s: Early career Cuarón began working on television in Mexico, first as a technician and then as a director. His television work led to assignments as an assistant director for several film productions including La Gran Fiesta, Gaby: A True Story and Romero, and in 1991 he landed his first big-screen directorial assignment. In 1991, Cuarón directed Sólo con tu pareja, a sex comedy about a womanizing businessman (played by Daniel Giménez Cacho) who, after having sex with an attractive nurse, is fooled into believing he's contracted AIDS. In addition to writing, producing and directing, Cuarón co-edited the film with Luis Patlán. The film, which also starred cabaret singer Astrid Hadad and model/actress Claudia Ramírez (with whom Cuarón was linked between 1989 and 1993) was a big hit in Mexico. After this success, director Sydney Pollack hired Cuarón to direct an episode of Fallen Angels, a series of neo-noir stories produced for the Showtime premium cable network in 1993; other directors who worked on the series included Steven Soderbergh, Jonathan Kaplan, Peter Bogdanovich, and Tom Hanks. In 1995, Cuarón released his first feature film produced in the United States, A Little Princess, an adaptation of Frances Hodgson Burnett's classic novel. Cuarón's next feature was also a literary adaptation, a modernized version of Charles Dickens's Great Expectations starring Ethan Hawke, Gwyneth Paltrow, and Robert De Niro. 2000s: International success In 2001, Cuarón found himself returning to Mexico with a Spanish-speaking cast to film Y tu mamá también, starring Gael García Bernal, Diego Luna and Maribel Verdú. It was a provocative and controversial road comedy about two sexually obsessed teenagers who take an extended road trip with an attractive married woman who is much older than them. The film's open portrayal of sexuality and frequent rude humor, as well as the politically and socially relevant asides, made the film an international hit and a major success with critics. Cuarón shared an Academy Award nomination for Best Original Screenplay with co-writer and brother Carlos Cuarón. In 2004, Cuarón directed the third film in the successful Harry Potter series, Harry Potter and the Prisoner of Azkaban. Cuarón faced criticism at the time from some Harry Potter fans for his approach to the film, notably its tendency to take more creative liberties with the source material than its predecessors. However, author J. K. Rowling, who had seen and loved Cuarón's film Y tu mamá también, said that it was her personal favorite from the series so far. Critically, the film was also better received than the first two installments, with some critics remarking its new tone and for being the first Harry Potter film to truly capture the essence of the novels. It has been subsequently rated by audience polls and critics as the best of the movie franchise series. In 2006, Cuarón's feature Children of Men, an adaptation of the P. D. James novel starring Clive Owen, Julianne Moore, and Michael Caine, received wide critical acclaim including three Academy Award nominations. Cuarón himself received two nominations for his work on the film in Best Film Editing (with Alex Rodríguez) and Best Adapted Screenplay (with several collaborators). He created the production and distribution company Esperanto Filmoj ("Esperanto Films", named because of his support for the international language Esperanto), which has credits in the films Duck Season, Pan's Labyrinth, and Gravity. Cuarón also directed the controversial public service announcement "I Am Autism" for Autism Speaks that was criticized by disability rights groups for its negative portrayal of autism. 2010s: Awards success In 2010, Cuarón began to develop the film Gravity, a drama set in space. He was joined by producer David Heyman, with whom Cuarón worked on Harry Potter and the Prisoner of Azkaban. Starring Sandra Bullock and George Clooney, the film opened the 70th Venice International Film Festival in August. The film was then released in America in October 2013 The film became financial success earning 723.2 million of the box office against a budget of 130 million. The film also received many awards nominations. For the film, he received the Golden Globe Award in the category of Best Director. The film received ten Academy Award nominations, including Best Picture and Best Director. Cuarón won for Best Directing, becoming the first Latin American to win the award, while he and Mark Sanger received the award for Best Film Editing. In 2013, Cuarón created Believe, a science fiction/fantasy/adventure series that was broadcast as part of the 2013–14 United States network television schedule on NBC as a mid-season entry. The series was created by Cuarón for Bad

many bishops were exiled to the other ends of the Roman Empire (e.g., Saint Hilary of Poitiers to the eastern provinces). These contacts and the common plight subsequently led to a rapprochement between the western supporters of the Nicene Creed and the homoousios and the eastern Semi-Arians. Council of Constantinople It was not until the co-reigns of Gratian and Theodosius that Arianism was effectively wiped out among the ruling class and elite of the Eastern Empire. Valens died in the Battle of Adrianople in 378 and was succeeded by Theodosius I, who adhered to the Nicene Creed. This allowed for settling the dispute. Theodosius's wife St Flacilla was instrumental in his campaign to end Arianism. Two days after Theodosius arrived in Constantinople, 24 November 380, he expelled the Homoiousian bishop, Demophilus of Constantinople, and surrendered the churches of that city to Gregory of Nazianzus, the leader of the rather small Nicene community there, an act which provoked rioting. Theodosius had just been baptized, by bishop Acholius of Thessalonica, during a severe illness, as was common in the early Christian world. In February he and Gratian had published an edict that all their subjects should profess the faith of the bishops of Rome and Alexandria (i.e., the Nicene faith), or be handed over for punishment for not doing so. Although much of the church hierarchy in the East had opposed the Nicene Creed in the decades leading up to Theodosius's accession, he managed to achieve unity on the basis of the Nicene Creed. In 381, at the Second Ecumenical Council in Constantinople, a group of mainly Eastern bishops assembled and accepted the Nicene Creed of 381, which was supplemented in regard to the Holy Spirit, as well as some other changes: see Comparison of Nicene Creeds of 325 and 381. This is generally considered the end of the dispute about the Trinity and the end of Arianism among the Roman, non-Germanic peoples. Among medieval Germanic tribes During the time of Arianism's flowering in Constantinople, the Gothic convert and Arian bishop Ulfilas (later the subject of the letter of Auxentius cited above) was sent as a missionary to the Gothic tribes across the Danube, a mission favored for political reasons by the Emperor Constantius II. The Homoians in the Danubian provinces played a major role in the conversion of the Goths to Arianism. Ulfilas's translation of the Bible into Gothic language and his initial success in converting the Goths to Arianism was strengthened by later events; the conversion of Goths led to a widespread diffusion of Arianism among other Germanic tribes as well (Vandals, Langobards, Svevi, and Burgundians). When the Germanic peoples entered the provinces of the Western Roman Empire and began founding their own kingdoms there, most of them were Arian Christians. The conflict in the 4th century had seen Arian and Nicene factions struggling for control of Western Europe. In contrast, among the Arian German kingdoms established in the collapsing Western Empire in the 5th century were entirely separate Arian and Nicene Churches with parallel hierarchies, each serving different sets of believers. The Germanic elites were Arians, and the Romance majority population was Nicene. The Arian Germanic tribes were generally tolerant towards Nicene Christians and other religious minorities, including the Jews. However, the Vandals tried for several decades to force their Arian beliefs on their North African Nicene subjects, exiling Nicene clergy, dissolving monasteries, and exercising heavy pressure on non-conforming Nicene Christians. The apparent resurgence of Arianism after Nicaea was more an anti-Nicene reaction exploited by Arian sympathizers than a pro-Arian development. By the end of the 4th century it had surrendered its remaining ground to Trinitarianism. In Western Europe, Arianism, which had been taught by Ulfilas, the Arian missionary to the Germanic tribes, was dominant among the Goths, Langobards and Vandals. By the 8th century, it had ceased to be the tribes' mainstream belief as the tribal rulers gradually came to adopt Nicene orthodoxy. This trend began in 496 with Clovis I of the Franks, then Reccared I of the Visigoths in 587 and Aripert I of the Lombards in 653. The Franks and the Anglo-Saxons were unlike the other Germanic peoples in that they entered the Western Roman Empire as Pagans and were converted to Chalcedonian Christianity, led by their kings, Clovis I of the Franks, and Æthelberht of Kent and others in Britain (see also Christianity in Gaul and Christianisation of Anglo-Saxon England). The remaining tribes – the Vandals and the Ostrogoths – did not convert as a people nor did they maintain territorial cohesion. Having been militarily defeated by the armies of Emperor Justinian I, the remnants were dispersed to the fringes of the empire and became lost to history. The Vandalic War of 533–534 dispersed the defeated Vandals. Following their final defeat at the Battle of Mons Lactarius in 553, the Ostrogoths went back north and (re)settled in south Austria. From the 5th to the 7th century Much of south-eastern Europe and central Europe, including many of the Goths and Vandals respectively, had embraced Arianism (the Visigoths converted to Arian Christianity in 376 through their bishop Wulfila), which led to Arianism being a religious factor in various wars in the Roman Empire. In the west, organized Arianism survived in North Africa, in Hispania, and parts of Italy until it was finally suppressed in the 6th and 7th centuries. Visigothic Spain converted to Nicene Christianity through their king Reccared I at the Third Council of Toledo in 589. Grimoald, King of the Lombards (662–671), and his young son and successor Garibald (671), were the last Arian kings in Europe. From the 16th to the 19th century Following the Protestant Reformation from 1517, it did not take long for Arian and other nontrinitarian views to resurface. The first recorded English antitrinitarian was John Assheton, who was forced to recant before Thomas Cranmer in 1548. At the Anabaptist Council of Venice 1550, the early Italian instigators of the Radical Reformation committed to the views of Michael Servetus, who was burned alive by the orders of John Calvin in 1553, and these were promulgated by Giorgio Biandrata and others into Poland and Transylvania. The antitrinitarian wing of the Polish Reformation separated from the Calvinist ecclesia maior to form the ecclesia minor or Polish Brethren. These were commonly referred to as "Arians" due to their rejection of the Trinity, though in fact the Socinians, as they were later known, went further than Arius to the position of Photinus. The epithet "Arian" was also applied to the early Unitarians such as John Biddle, though in denial of the pre-existence of Christ they were again largely Socinians, not Arians. In 1683, when Anthony Ashley Cooper, 1st Earl of Shaftesbury, lay dying in Amsterdam – driven into exile by his outspoken opposition to King Charles II – he spoke to the minister Robert Ferguson, and professed himself an Arian. In the 18th century the "dominant trend" in Britain, particularly in Latitudinarianism, was towards Arianism, with which the names of Samuel Clarke, Benjamin Hoadly, William Whiston and Isaac Newton are associated. To quote the Encyclopædia Britannica article on Arianism: "In modern times some Unitarians are virtually Arians in that they are unwilling either to reduce Christ to a mere human being or to attribute to him a divine nature identical with that of the Father." A similar view was held by the ancient anti-Nicene Pneumatomachi (Greek: , "breath" or "spirit" and "fighters", combining as "fighters against the spirit"), so called because they opposed the deifying of the Nicene Holy Ghost. Although the Pneumatomachi's beliefs were somewhat reminiscent of Arianism, they were a distinct group. Today The teachings of the first two ecumenical councils – which entirely reject Arianism – are held by the Catholic Church, the Eastern Orthodox Church, the Oriental Orthodox Churches, the Assyrian Church of the East and most churches founded during the Reformation in the 16th century or influenced by it (Lutheran, Reformed/Presbyterian, and Anglican). Also, nearly all Protestant groups (such as Methodists, Baptists, Evangelicals and most Pentecostals) entirely reject the teachings associated with Arianism. Modern groups which currently appear to embrace some of the principles of Arianism include Unitarians and Jehovah's Witnesses. Although the origins of their beliefs are not necessarily attributed to the teachings of Arius, many of the core beliefs of Unitarians and Jehovah's Witnesses are very similar to them. The Church of Jesus Christ of Latter-day Saints The doctrine of The Church of Jesus Christ of Latter-day Saints (LDS Church) concerning the nature of the Godhead teaches a nontrinitarian theology. The church's first Article of Faith states: "We believe in God, the Eternal Father, and in His Son, Jesus Christ, and in the Holy Ghost," while the 130th section of the its Doctrine and Covenants explains that "The Father has a body of flesh and bones as tangible as man's; the Son also; but the Holy Ghost has not a body of flesh and bones, but is a personage of Spirit. Were it not so, the Holy Ghost could not dwell in us." Similarities between LDS doctrines and Arianism were noted as early as 1846. There are, however, a number of key differences between Arianism and Latter-day Saint theology, including the co-eternality of Jesus Christ and the Holy Ghost with the Father. Latter-day Saints deny any form of creation ex nihilo, whereas creation ex nihilo and Christ's created and inferior nature are fundamental premises of Arianism. Arianism also teaches that Christ's existence is contingent on the Father, and that he is ontologically subordinate to the Father. Both of these premises are rejected by Latter-day Saint doctrine. Conversely, the LDS Church teaches that Christ is equal in nature, power, and glory with the Father, having perfectly subordinated his will to the Father's. In turn, the Father is understood to have his power by virtue of his own perfect character and subordination to eternal and uncreated principles of righteousness. The Book of Mormon prophet Alma summarizes this by saying that were God not to be perfectly just, then "God would cease to be God". Thus, Christ's subordination to the Father's will is understood as subordination to those same eternal and uncreated principles of righteousness through perfectly emulating the Father's character and example. The LDS Church teaches that this view of the Godhead is the doctrine taught by Jesus Christ and other ancient prophets, and, by extension, that taught by the scriptures now compiled as the Bible and the Book of Mormon. Thus, Latter-day Saint doctrine does not accept the Nicene definition of Trinity (that the three are consubstantial) nor agree with the Athanasian statement that God and Christ are incomprehensible. In contrast, the Church teaches that the Biblical doctrine is self-evident: "the Father, the Son and the Holy Spirit (or Holy Ghost)... are three physically separate beings, but fully one in love, purpose and will", as illustrated in the Farewell Prayer of Jesus, his baptism at the hands of John, his transfiguration, and the martyrdom of Stephen. Jehovah's Witnesses Jehovah's Witnesses are often referred to as "modern-day Arians" or they are sometimes referred to as "Semi-Arians", usually by their opponents, although Jehovah's Witnesses themselves have denied these claims. While there are some significant similarities in matters of doctrine, Jehovah's Witnesses differ from Arians by stating that the Son can fully know the Father (something which Arius himself denied), and by their denial of personality to the Holy Spirit. The original Arians also generally prayed directly to Jesus, whereas Jehovah's Witnesses exclusively worship and pray to Jehovah God (God the Father) only through Jesus the son as a mediator. Iglesia ni Cristo The Iglesia di Cristo's christology has parallels with Arianism in that it affirms Jesus' pre-existence, but holds that he was sanctified and given his holiness by the Father, who they hold to be the only true God. Others Other groups which oppose the belief in the Trinity are not Arian. Other Biblical Unitarians such as the Christadelphians and Church of God General Conference are typically Socinian rather than Arian in their Christology. The Gospel Assemblies, a group of Pentecostal, non-denominational churches which believe that only the Father has inherent immortality, but that the Son has received immortality from the Father, and that the Holy Spirit is not a distinct person with distinct intelligence, but rather the life and presence of God the Father and his Son. The Godhead comprises two distinct persons. There are also various Binitarian churches which believe that God is two persons: the Father and the Son, and that the Holy Spirit is not a person. These include the Church of God (Seventh Day) and its various offshoots. One offshoot in particular, Radio Church of God (founded by Herbert W. Armstrong and renamed Worldwide Church of God), was originally Binitarian, but converted to Trinitarianism after Armstrong's death. That conversion prompted the formation of many small breakaway churches which retained Binitarian beliefs, such as Restored Church of God, United Church of God, Philadelphia Church of God, and Living Church of God. Other Binitarian churches include the Church of Jesus Christ (Bickertonite), an offshoot of Mormonism, which believes that God is two personages, not two persons. Binitarian churches generally believe that the Father is greater than the Son, a view somewhat similar to Arianism. See also References Notes Citations Sources Further reading External links Documents of the Early Arian Controversy Chronological survey of the sources English translations of all extant letters relating to early Arianism A map of early sympathizers with Arius Jewish Encyclopedia: Arianism Concordia Cyclopedia: Arianism (page 1) (page 2) (page 3) The Arians of the fourth century by John Henry "Cardinal" Newman in "btm" format

return once they had signed an ambiguous statement of faith. The two, and other friends of Arius, worked for Arius's rehabilitation. At the First Synod of Tyre in AD 335, they brought accusations against Athanasius, now bishop of Alexandria, the primary opponent of Arius. After this, Constantine had Athanasius banished since he considered him an impediment to reconciliation. In the same year, the Synod of Jerusalem under Constantine's direction readmitted Arius to communion in 336. Arius died on the way to this event in Constantinople. Some scholars suggest that Arius may have been poisoned by his opponents. Eusebius and Theognis remained in the Emperor's favor, and when Constantine, who had been a catechumen much of his adult life, accepted baptism on his deathbed, it was from Eusebius of Nicomedia. Aftermath of Nicaea The First Council of Nicaea did not end the controversy, as many bishops of the Eastern provinces disputed the homoousios, the central term of the Nicene Creed, as it had been used by Paul of Samosata, who had advocated a monarchianist Christology. Both the man and his teaching, including the term homoousios, had been condemned by the Synods of Antioch in 269. Hence, after Constantine's death in 337, open dispute resumed again. Constantine's son Constantius II, who had become emperor of the eastern part of the Roman Empire, actually encouraged the Arians and set out to reverse the Nicene Creed. His advisor in these affairs was Eusebius of Nicomedia, who had already at the Council of Nicaea been the head of the Arian party, who also was made the bishop of Constantinople. Constantius used his power to exile bishops adhering to the Nicene Creed, especially St Athanasius of Alexandria, who fled to Rome. In 355 Constantius became the sole Roman emperor and extended his pro-Arian policy toward the western provinces, frequently using force to push through his creed, even exiling Pope Liberius and installing Antipope Felix II. The Third Council of Sirmium in 357 was the high point of Arianism. The Seventh Arian Confession (Second Sirmium Confession) held that both homoousios (of one substance) and homoiousios (of similar substance) were unbiblical and that the Father is greater than the Son. (This confession was later known as the Blasphemy of Sirmium.) But since many persons are disturbed by questions concerning what is called in Latin substantia, but in Greek ousia, that is, to make it understood more exactly, as to 'coessential,' or what is called, 'like-in-essence,' there ought to be no mention of any of these at all, nor exposition of them in the Church, for this reason and for this consideration, that in divine Scripture nothing is written about them, and that they are above men's knowledge and above men's understanding; As debates raged in an attempt to come up with a new formula, three camps evolved among the opponents of the Nicene Creed. The first group mainly opposed the Nicene terminology and preferred the term homoiousios (alike in substance) to the Nicene homoousios, while they rejected Arius and his teaching and accepted the equality and co-eternality of the persons of the Trinity. Because of this centrist position, and despite their rejection of Arius, they were called "Semi-Arians" by their opponents. The second group also avoided invoking the name of Arius, but in large part followed Arius's teachings and, in another attempted compromise wording, described the Son as being like (homoios) the Father. A third group explicitly called upon Arius and described the Son as unlike (anhomoios) the Father. Constantius wavered in his support between the first and the second party, while harshly persecuting the third. Epiphanius of Salamis labeled the party of Basil of Ancyra in 358 "Semi-Arianism". This is considered unfair by Kelly who states that some members of the group were virtually orthodox from the start but disliked the adjective homoousios while others had moved in that direction after the out-and-out Arians had come into the open. The debates among these groups resulted in numerous synods, among them the Council of Serdica in 343, the Fourth Council of Sirmium in 358 and the double Council of Rimini and Seleucia in 359, and no fewer than fourteen further creed formulas between 340 and 360, leading the pagan observer Ammianus Marcellinus to comment sarcastically: "The highways were covered with galloping bishops." None of these attempts were acceptable to the defenders of Nicene orthodoxy; writing about the latter councils, Saint Jerome remarked that the world "awoke with a groan to find itself Arian." After Constantius' death in 361, his successor Julian, a devotee of Rome's pagan gods, declared that he would no longer attempt to favor one church faction over another, and allowed all exiled bishops to return; this resulted in further increasing dissension among Nicene Christians. The emperor Valens, however, revived Constantius' policy and supported the "Homoian" party, exiling bishops and often using force. During this persecution many bishops were exiled to the other ends of the Roman Empire (e.g., Saint Hilary of Poitiers to the eastern provinces). These contacts and the common plight subsequently led to a rapprochement between the western supporters of the Nicene Creed and the homoousios and the eastern Semi-Arians. Council of Constantinople It was not until the co-reigns of Gratian and Theodosius that Arianism was effectively wiped out among the ruling class and elite of the Eastern Empire. Valens died in the Battle of Adrianople in 378 and was succeeded by Theodosius I, who adhered to the Nicene Creed. This allowed for settling the dispute. Theodosius's wife St Flacilla was instrumental in his campaign to end Arianism. Two days after Theodosius arrived in Constantinople, 24 November 380, he expelled the Homoiousian bishop, Demophilus of Constantinople, and surrendered the churches of that city to Gregory of Nazianzus, the leader of the rather small Nicene community there, an act which provoked rioting. Theodosius had just been baptized, by bishop Acholius of Thessalonica, during a severe illness, as was common in the early Christian world. In February he and Gratian had published an edict that all their subjects should profess the faith of the bishops of Rome and Alexandria (i.e., the Nicene faith), or be handed over for punishment for not doing so. Although much of the church hierarchy in the East had opposed the Nicene Creed in the decades leading up to Theodosius's accession, he managed to achieve unity on the basis of the Nicene Creed. In 381, at the Second Ecumenical Council in Constantinople, a group of mainly Eastern bishops assembled and accepted the Nicene Creed of 381, which was supplemented in regard to the Holy Spirit, as well as some other changes: see Comparison of Nicene Creeds of 325 and 381. This is generally considered the end of the dispute about the Trinity and the end of Arianism among the Roman, non-Germanic peoples. Among medieval Germanic tribes During the time of Arianism's flowering in Constantinople, the Gothic convert and Arian bishop Ulfilas (later the subject of the letter of Auxentius cited above) was sent as a missionary to the Gothic tribes across the Danube, a mission favored for political reasons by the Emperor Constantius II. The Homoians in the Danubian provinces played a major role in the conversion of the Goths to Arianism. Ulfilas's translation of the Bible into Gothic language and his initial success in converting the Goths to Arianism was strengthened by later events; the conversion of Goths led to a widespread diffusion of Arianism among other Germanic tribes as well (Vandals, Langobards, Svevi, and Burgundians). When the Germanic peoples entered the provinces of the Western Roman Empire and began founding their own kingdoms there, most of them were Arian Christians. The conflict in the 4th century had seen Arian and Nicene factions struggling for control of Western Europe. In contrast, among the Arian German kingdoms established in the collapsing Western Empire in the 5th century were entirely separate Arian and Nicene Churches with parallel hierarchies, each serving different sets of believers. The Germanic elites were Arians, and the Romance majority population was Nicene. The Arian Germanic tribes were generally tolerant towards Nicene Christians and other religious minorities, including the Jews. However, the Vandals tried for several decades to force their Arian beliefs on their North African Nicene subjects, exiling Nicene clergy, dissolving monasteries, and exercising heavy pressure on non-conforming Nicene Christians. The apparent resurgence of Arianism after Nicaea was more an anti-Nicene reaction exploited by Arian sympathizers than a pro-Arian development. By the end of the 4th century it had surrendered its remaining ground to Trinitarianism. In Western Europe, Arianism, which had been taught by Ulfilas, the Arian missionary to the Germanic tribes, was dominant among the Goths, Langobards and Vandals. By the 8th century, it had ceased to be the tribes' mainstream belief as the tribal rulers gradually came to adopt Nicene orthodoxy. This trend began in 496 with Clovis I of the Franks, then Reccared I of the Visigoths in 587 and Aripert I of the Lombards in 653. The Franks and the Anglo-Saxons were unlike the other Germanic peoples in that they entered the Western Roman Empire as Pagans and were converted to Chalcedonian Christianity, led by their kings, Clovis I of the Franks, and Æthelberht of Kent and others in Britain (see also Christianity in Gaul and Christianisation of Anglo-Saxon England). The remaining tribes – the Vandals and the Ostrogoths – did not convert as a people nor did they maintain territorial cohesion. Having been militarily defeated by the armies of Emperor Justinian I, the remnants were dispersed to the fringes of the empire and became lost to history. The Vandalic War of 533–534 dispersed the defeated Vandals. Following their final defeat at the Battle of Mons Lactarius in 553, the Ostrogoths went back north and (re)settled in south Austria. From the 5th to the 7th century Much of south-eastern Europe and central Europe, including many of the Goths and Vandals respectively, had embraced Arianism (the Visigoths converted to Arian Christianity in 376 through their bishop Wulfila), which led to Arianism being a religious factor in various wars in the Roman Empire. In the west, organized Arianism survived in North Africa, in Hispania, and parts of Italy until it was finally suppressed in the 6th and 7th centuries. Visigothic Spain converted to Nicene Christianity through their king Reccared I at the Third Council of Toledo in 589. Grimoald, King of the Lombards (662–671), and his young son and successor Garibald (671), were the last Arian kings in Europe. From the 16th to the 19th century Following the Protestant Reformation from 1517, it did not take long for Arian and other nontrinitarian views to resurface. The first recorded English antitrinitarian was John Assheton, who was forced to recant before Thomas Cranmer in 1548. At the Anabaptist Council of Venice 1550, the early Italian instigators of the Radical Reformation committed to the views of Michael Servetus, who was burned alive by the orders of John Calvin in 1553, and these were promulgated by Giorgio Biandrata and others into Poland and Transylvania. The antitrinitarian wing of the Polish Reformation separated from the Calvinist ecclesia maior to form the ecclesia minor or Polish Brethren. These were commonly referred to as "Arians" due to their rejection of the Trinity, though in fact the Socinians, as they were later known, went further than Arius to the position of Photinus. The epithet "Arian" was also applied to the early Unitarians such as John Biddle, though in denial of the pre-existence of Christ they were again largely Socinians, not Arians. In 1683, when Anthony Ashley Cooper, 1st Earl of Shaftesbury, lay dying in Amsterdam – driven into exile by his outspoken opposition to King Charles II – he spoke to the minister Robert Ferguson, and professed himself an Arian. In the 18th century the "dominant trend" in Britain, particularly in Latitudinarianism, was towards Arianism, with which the names of Samuel Clarke, Benjamin Hoadly, William Whiston and Isaac Newton are associated. To quote the Encyclopædia Britannica article on Arianism: "In modern times some Unitarians are virtually Arians in that they are unwilling either to reduce Christ to a mere human being or to attribute to him a divine nature identical with that of the Father." A similar view was held by the ancient anti-Nicene Pneumatomachi (Greek: , "breath" or "spirit" and "fighters", combining as "fighters against the spirit"), so called because they opposed the deifying of the Nicene Holy Ghost. Although the Pneumatomachi's beliefs were somewhat reminiscent of Arianism, they were a distinct group. Today The teachings of the first two ecumenical councils – which entirely reject Arianism – are held by the Catholic Church, the Eastern Orthodox Church, the Oriental Orthodox Churches, the Assyrian Church of the East and most churches founded during the Reformation in the 16th century or influenced by it (Lutheran, Reformed/Presbyterian, and Anglican). Also, nearly all Protestant groups (such as Methodists, Baptists, Evangelicals and most Pentecostals) entirely reject the teachings associated with Arianism. Modern groups which currently appear to embrace some of the principles of Arianism include Unitarians and Jehovah's Witnesses. Although the origins of their beliefs are not necessarily attributed to the teachings of Arius, many of the core beliefs of Unitarians and Jehovah's Witnesses are very similar to them. The Church of Jesus Christ of Latter-day Saints The doctrine of The Church of Jesus Christ of Latter-day Saints (LDS Church) concerning the nature of the Godhead teaches a nontrinitarian theology. The church's first Article of Faith states: "We believe in God, the Eternal Father, and in His Son, Jesus Christ, and in the Holy Ghost," while the 130th section of the its Doctrine and Covenants explains that "The Father has a body of flesh and bones as tangible as man's; the Son also; but the Holy Ghost has not a body of flesh and bones, but is a personage of Spirit. Were it not so, the Holy Ghost could not dwell in us." Similarities between LDS doctrines and Arianism were noted as

army led by Raimondo Montecuccoli, resulting in the Peace of Vasvár. 1714 – George, Elector of Hanover, becomes King George I of Great Britain, marking the beginning of the Georgian era of British history. 1759 – Seven Years' War: The Battle of Minden, an allied Anglo-German army victory over the French. In Britain this was one of a number of events that constituted the Annus Mirabilis of 1759 and is celebrated as Minden Day by certain British Army regiments. 1774 – British scientist Joseph Priestley discovers oxygen gas, corroborating the prior discovery of this element by German-Swedish chemist Carl Wilhelm Scheele. 1798 – French Revolutionary Wars: Battle of the Nile (Battle of Aboukir Bay): Battle begins when a British fleet engages the French Revolutionary Navy fleet in an unusual night action. 1800 – The Acts of Union 1800 are passed which merge the Kingdom of Great Britain and the Kingdom of Ireland into the United Kingdom of Great Britain and Ireland. 1801 – First Barbary War: The American schooner captures the Tripolitan polacca Tripoli in a single-ship action off the coast of modern-day Libya. 1834 – Slavery is abolished in the British Empire as the Slavery Abolition Act 1833 comes into force, although it remains legal in the possessions of the East India Company until the passage of the Indian Slavery Act, 1843. 1834 – Construction begins on the Wilberforce Monument in Kingston Upon Hull. 1842 – The Lombard Street riot erupts in Philadelphia, Pennsylvania, United States. 1849 – Joven Daniel wrecks at the coast of Araucanía, Chile, leading to allegations that local Mapuche tribes murdered survivors and kidnapped Elisa Bravo. 1855 – The first ascent of Monte Rosa, the second highest summit in the Alps. 1863 – At the suggestion of Senator J. V. Snellman and the order of Emperor Alexander II, full rights were promised to the Finnish language by a language regulation in the Grand Duchy of Finland. 1876 – Colorado is admitted as the 38th U.S. state. 1893 – Henry Perky patents shredded wheat. 1894 – The First Sino-Japanese War erupts between Japan and China over Korea. 1901–present 1907 – The start of the first Scout camp on Brownsea Island, the origin of the worldwide Scouting movement. 1911 – Harriet Quimby takes her pilot's test and becomes the first U.S. woman to earn an Aero Club of America aviator's certificate. 1914 – The German Empire declares war on the Russian Empire at the opening of World War I. The Swiss Army mobilizes because of World War I. 1927 – The Nanchang Uprising marks the first significant battle in the Chinese Civil War between the Kuomintang and Chinese Communist Party. This day is commemorated as the anniversary of the founding of the People's Liberation Army. 1933 – Anti-Fascist activists Bruno Tesch, Walter Möller, Karl Wolff and August Lütgens are executed by the Nazi regime in Altona. 1936 – The Olympics opened in Berlin with a ceremony presided over by Adolf Hitler. 1937 – Josip Broz Tito reads the resolution "Manifesto of constitutional congress of KPH" to the constitutive congress of KPH (Croatian Communist Party) in woods near Samobor. 1943 – World War II: Operation Tidal Wave also known as "Black Sunday", was a failed American attempt to destroy Romanian oil fields. 1944 – World War II: The Warsaw Uprising against the Nazi German occupation breaks out in Warsaw, Poland. 1946 – Leaders of the Russian Liberation Army, a force of Russian prisoners of war that collaborated with Nazi Germany, are executed in Moscow, Soviet Union for treason. 1950 – Guam is organized as an unincorporated territory of the United States as the President Harry S. Truman signs the Guam Organic Act. 1957 – The United States and Canada form the North American Aerospace Defense Command (NORAD). 1960 – Dahomey (later renamed Benin) declares independence from France. 1960 – Islamabad is declared the federal capital of the Government of Pakistan. 1961 – U.S. Defense Secretary Robert McNamara orders the creation of the Defense Intelligence Agency (DIA), the nation's first centralized military espionage organization. 1964 – The former Belgian Congo is renamed the Democratic Republic of the Congo. 1965 – Frank Herbert's novel, Dune was published for the first time. It was named as the world's best-selling science fiction novel in 2003. 1966 – Charles Whitman kills 16 people at the University of Texas at Austin before being killed by the police. 1966 – Purges of intellectuals and imperialists becomes official China policy at the beginning of the Cultural Revolution. 1968 – The coronation is held of Hassanal Bolkiah, the 29th Sultan of Brunei. 1971 – The Concert for Bangladesh, organized by former Beatle George Harrison, is held at Madison Square Garden in New York City. 1974 – Cyprus dispute: The United Nations Security Council authorizes the UNFICYP to create the "Green Line", dividing Cyprus into two zones. 1976 – Niki Lauda has a severe accident that almost claims his life at the German Grand Prix at Nurburgring. 1980 – Vigdís Finnbogadóttir is elected President of Iceland and becomes the world's first democratically elected female head of state. 1980 – A train crash kills 18 people in County Cork, Ireland. 1981 – MTV begins broadcasting in the United States and airs its first video, "Video Killed the Radio Star" by The Buggles. 1984 – Commercial peat-cutters discover the preserved bog body of a man, called Lindow Man, at Lindow Moss, Cheshire, England. 1988 – A British soldier was killed in the Inglis Barracks bombing in London, England. 1993 – The Great Mississippi and Missouri Rivers Flood of 1993 comes to a peak. 2004 – A supermarket fire kills 396 people and injures 500 others in Asunción, Paraguay. 2007 – The I-35W Mississippi River bridge spanning the Mississippi River in Minneapolis, Minnesota, collapses during the evening rush hour, killing 13 people and injuring 145. 2008 – The Beijing–Tianjin Intercity Railway begins operation as the fastest commuter rail system in the world. 2008 – Eleven mountaineers from international expeditions died on K2, the second-highest mountain on Earth in the worst single accident in the history of K2 mountaineering. 2017 – A suicide attack on a mosque in Herat, Afghanistan kills 20 people. Births Pre-1600 10 BC – Claudius, Roman emperor (d. 54) 126 – Pertinax, Roman emperor (d. 193) 845 – Sugawara no Michizane, Japanese scholar and politician (d. 903) 992 – Hyeonjong of Goryeo, Korean king (d. 1031) 1068 – Emperor Taizu of Jin, Chinese emperor (d. 1123) 1313 – Kōgon, Japanese emperor (d. 1364) 1377 – Go-Komatsu, Japanese emperor (d. 1433) 1385 – John FitzAlan, 13th Earl of Arundel (d. 1421) 1410 – Jan IV of Nassau, German count (d. 1475) 1492 – Wolfgang, Prince of Anhalt-Köthen, German prince (d. 1566) 1520 – Sigismund II, Polish king (d. 1572) 1545 – Andrew Melville, Scottish theologian and scholar (d. 1622) 1555 – Edward Kelley, English spirit medium (d. 1597) 1579 – Luis Vélez de Guevara, Spanish author and playwright (d. 1644) 1601–1900 1626 – Sabbatai Zevi, Montenegrin rabbi and theorist (d. 1676) 1630 – Thomas Clifford, 1st Baron Clifford of Chudleigh, English politician, Lord High Treasurer (d. 1673) 1659 – Sebastiano Ricci, Italian painter (d. 1734) 1713 – Charles I, German duke and prince (d. 1780) 1714 – Richard Wilson, Welsh painter and academic (d. 1782) 1738 – Jacques François Dugommier, French general (d. 1794) 1744 – Jean-Baptiste Lamarck, French soldier, biologist, and academic (d. 1829) 1770 – William Clark, American soldier, explorer, and politician, 4th Governor of Missouri Territory (d. 1838) 1779 – Francis Scott Key, American lawyer, author, and poet (d. 1843) 1779 – Lorenz Oken, German-Swiss botanist, biologist, and ornithologist (d. 1851) 1809 – William B. Travis, American colonel and lawyer (d. 1836) 1815 – Richard Henry Dana, Jr., American lawyer and politician (d. 1882) 1818 – Maria Mitchell, American astronomer and academic (d. 1889) 1819 – Herman Melville, American novelist, short story writer, and poet (d. 1891) 1831 – Antonio Cotogni, Italian opera singer and educator (d. 1918) 1843 – Robert Todd Lincoln, American lawyer and politician, 35th United States Secretary of War (d. 1926) 1856 – George Coulthard, Australian footballer and cricketer (d. 1883) 1858 – Gaston Doumergue, French lawyer and politician, 13th President of France (d. 1937) 1858 – Hans Rott, Austrian organist and composer (d. 1884) 1860 – Bazil Assan, Romanian engineer and explorer (d. 1918) 1861 – Sammy Jones, Australian cricketer (d. 1951) 1865 – Isobel Lilian Gloag, English painter (d. 1917) 1871 – John Lester, American cricketer and soccer player (d. 1969) 1877 – George Hackenschmidt, Estonian-English wrestler and strongman (d. 1968) 1878 – Konstantinos Logothetopoulos, Greek physician and politician, Prime Minister of Greece (d. 1961) 1881 – Otto Toeplitz, German mathematician and academic (d. 1940) 1885 – George de Hevesy, Hungarian-German chemist and academic, Nobel Prize laureate (d. 1966) 1889 – Walter Gerlach, German physicist and academic (d. 1979) 1891 – Karl Kobelt, Swiss lawyer and politician, 52nd President of the Swiss Confederation (d. 1968) 1893 – Alexander of Greece (d. 1920) 1894 – Ottavio Bottecchia, Italian cyclist (d. 1927) 1898 – Morris Stoloff, American composer and musical director (d. 1980) 1899 – Raymond Mays, English race car driver and businessman (d. 1980) 1900 – Otto Nothling, Australian cricketer and rugby player (d. 1965) 1901–present 1901 – Francisco Guilledo, Filipino boxer (d. 1925) 1903 – Paul Horgan, American historian, author, and academic (d. 1995) 1905 – Helen Sawyer Hogg, American-Canadian astronomer and academic (d. 1993) 1907 – Eric Shipton, Sri Lankan-English mountaineer and explorer (d. 1977) 1910 – James Henry Govier, English painter and illustrator (d. 1974) 1910 – Walter Scharf, American pianist and composer (d. 2003) 1910 – Gerda Taro, German war photographer (d. 1937) 1911 – Jackie Ormes, American journalist and cartoonist (d. 1985) 1912 – David Brand, Australian politician, 19th Premier of Western Australia (d. 1979) 1912 – Gego, German-Venezuelan sculptor and academic (d. 1994) 1912 – Henry Jones, American actor (d. 1999) 1914 – Jack Delano, American photographer and composer (d. 1997) 1914 – Alan Moore, Australian painter and educator (d. 2015) 1914 – J. Lee Thompson, English-Canadian director, producer, and screenwriter (d. 2002) 1916 – Fiorenzo Angelini, Italian cardinal (d. 2014) 1916 – Anne Hébert, Canadian author and poet (d. 2000) 1918 – T. J. Jemison, American minister and activist (d. 2013) 1919 – Stanley Middleton, English author (d. 2009) 1920 – Raul Renter, Estonian economist and chess player (d. 1992) 1921 – Jack Kramer, American tennis player, sailor, and sportscaster (d. 2009) 1921 – Pat McDonald, Australian actress (d. 1990) 1922 – Arthur Hill, Canadian-American actor (d. 2006) 1924 – Abdullah of Saudi Arabia (d. 2015) 1924 – Frank Havens, American canoeist (d. 2018) 1924 – Marcia Mae Jones, American actress and singer (d. 2007) 1924 – Frank Worrell, Barbadian cricketer (d. 1967) 1925 – Ernst Jandl, Austrian poet and author (d. 2000) 1926 – George Hauptfuhrer, American basketball player and lawyer (d. 2013) 1926 – Hannah Hauxwell, English TV personality (d. 2018) 1927 – María Teresa López Boegeholz, Chilean oceanographer (d. 2006) 1927 – Anthony G. Bosco, American bishop (d. 2013) 1928 – Jack Shea, American director, producer, and screenwriter (d. 2013) 1929 – Hafizullah Amin, Afghan educator and politician, Afghan Minister of

1831 – Antonio Cotogni, Italian opera singer and educator (d. 1918) 1843 – Robert Todd Lincoln, American lawyer and politician, 35th United States Secretary of War (d. 1926) 1856 – George Coulthard, Australian footballer and cricketer (d. 1883) 1858 – Gaston Doumergue, French lawyer and politician, 13th President of France (d. 1937) 1858 – Hans Rott, Austrian organist and composer (d. 1884) 1860 – Bazil Assan, Romanian engineer and explorer (d. 1918) 1861 – Sammy Jones, Australian cricketer (d. 1951) 1865 – Isobel Lilian Gloag, English painter (d. 1917) 1871 – John Lester, American cricketer and soccer player (d. 1969) 1877 – George Hackenschmidt, Estonian-English wrestler and strongman (d. 1968) 1878 – Konstantinos Logothetopoulos, Greek physician and politician, Prime Minister of Greece (d. 1961) 1881 – Otto Toeplitz, German mathematician and academic (d. 1940) 1885 – George de Hevesy, Hungarian-German chemist and academic, Nobel Prize laureate (d. 1966) 1889 – Walter Gerlach, German physicist and academic (d. 1979) 1891 – Karl Kobelt, Swiss lawyer and politician, 52nd President of the Swiss Confederation (d. 1968) 1893 – Alexander of Greece (d. 1920) 1894 – Ottavio Bottecchia, Italian cyclist (d. 1927) 1898 – Morris Stoloff, American composer and musical director (d. 1980) 1899 – Raymond Mays, English race car driver and businessman (d. 1980) 1900 – Otto Nothling, Australian cricketer and rugby player (d. 1965) 1901–present 1901 – Francisco Guilledo, Filipino boxer (d. 1925) 1903 – Paul Horgan, American historian, author, and academic (d. 1995) 1905 – Helen Sawyer Hogg, American-Canadian astronomer and academic (d. 1993) 1907 – Eric Shipton, Sri Lankan-English mountaineer and explorer (d. 1977) 1910 – James Henry Govier, English painter and illustrator (d. 1974) 1910 – Walter Scharf, American pianist and composer (d. 2003) 1910 – Gerda Taro, German war photographer (d. 1937) 1911 – Jackie Ormes, American journalist and cartoonist (d. 1985) 1912 – David Brand, Australian politician, 19th Premier of Western Australia (d. 1979) 1912 – Gego, German-Venezuelan sculptor and academic (d. 1994) 1912 – Henry Jones, American actor (d. 1999) 1914 – Jack Delano, American photographer and composer (d. 1997) 1914 – Alan Moore, Australian painter and educator (d. 2015) 1914 – J. Lee Thompson, English-Canadian director, producer, and screenwriter (d. 2002) 1916 – Fiorenzo Angelini, Italian cardinal (d. 2014) 1916 – Anne Hébert, Canadian author and poet (d. 2000) 1918 – T. J. Jemison, American minister and activist (d. 2013) 1919 – Stanley Middleton, English author (d. 2009) 1920 – Raul Renter, Estonian economist and chess player (d. 1992) 1921 – Jack Kramer, American tennis player, sailor, and sportscaster (d. 2009) 1921 – Pat McDonald, Australian actress (d. 1990) 1922 – Arthur Hill, Canadian-American actor (d. 2006) 1924 – Abdullah of Saudi Arabia (d. 2015) 1924 – Frank Havens, American canoeist (d. 2018) 1924 – Marcia Mae Jones, American actress and singer (d. 2007) 1924 – Frank Worrell, Barbadian cricketer (d. 1967) 1925 – Ernst Jandl, Austrian poet and author (d. 2000) 1926 – George Hauptfuhrer, American basketball player and lawyer (d. 2013) 1926 – Hannah Hauxwell, English TV personality (d. 2018) 1927 – María Teresa López Boegeholz, Chilean oceanographer (d. 2006) 1927 – Anthony G. Bosco, American bishop (d. 2013) 1928 – Jack Shea, American director, producer, and screenwriter (d. 2013) 1929 – Hafizullah Amin, Afghan educator and politician, Afghan Minister of Foreign Affairs (d. 1979) 1929 – Ann Calvello, American roller derby racer (d. 2006) 1929 – Leila Abashidze, Georgian actress (d. 2018) 1930 – Lionel Bart, English composer (d. 1999) 1930 – Pierre Bourdieu, French sociologist, anthropologist, and philosopher (d. 2002) 1930 – Julie Bovasso, American actress and writer (d. 1991) 1930 – Lawrence Eagleburger, American lieutenant and politician, 62nd United States Secretary of State (d. 2011) 1930 – Károly Grósz, Hungarian politician, 51st Prime Minister of Hungary (d. 1996) 1930 – Geoffrey Holder, Trinidadian-American actor, singer, dancer, and choreographer (d. 2014) 1931 – Ramblin' Jack Elliott, American singer-songwriter and guitarist 1931 – Trevor Goddard, South African cricketer (d. 2016) 1932 – Meir Kahane, American-Israeli rabbi and activist, founded the Jewish Defense League (d. 1990) 1933 – Dom DeLuise, American actor, singer, director, and producer (d. 2009) 1933 – Masaichi Kaneda, Japanese baseball player and manager (d. 2019) 1933 – Meena Kumari, Indian actress (d. 1972) 1933 – Teri Shields, American actress, producer, and agent (d. 2012) 1933 – Dušan Třeštík, Czech historian and author (d. 2007) 1934 – John Beck, New Zealand cricketer (d. 2000) 1934 – Derek Birdsall, English graphic designer 1935 – Geoff Pullar, English cricketer (d. 2014) 1936 – W. D. Hamilton, Egyptian born British biologist, psychologist, and academic (d. 2000) 1936 – Yves Saint Laurent, Algerian-French fashion designer, co-founded Yves Saint Laurent (d. 2008) 1936 – Laurie Taylor, English sociologist, radio host, and academic 1937 – Al D'Amato, American lawyer and politician 1939 – Bob Frankford, English-Canadian physician and politician (d. 2015) 1939 – Terry Kiser, American actor 1939 – Stephen Sykes, English bishop and theologian (d. 2014) 1939 – Robert James Waller, American author and photographer (d. 2017) 1940 – Mervyn Kitchen, English cricketer and umpire 1940 – Henry Silverman, American businessman, founded Cendant 1940 – Mahmoud Dowlatabadi, Iranian writer and actor 1941 – Ron Brown, American captain and politician, 30th United States Secretary of Commerce (d. 1996) 1941 – Étienne Roda-Gil, French songwriter and screenwriter (d. 2004) 1942 – Jerry Garcia, American singer-songwriter and guitarist (d. 1995) 1942 – Giancarlo Giannini, Italian actor, director, producer, and screenwriter 1944 – Dmitry Nikolayevich Filippov, Russian banker and politician (d. 1998) 1945 – Douglas Osheroff, American physicist and academic, Nobel Prize laureate 1946 – Boz Burrell, English singer-songwriter, bass player, and guitarist (d. 2006) 1946 – Rick Coonce, American drummer (d. 2011) 1946 – Richard O. Covey, American colonel, pilot, and astronaut 1946 – Fiona Stanley, Australian epidemiologist and academic 1947 – Lorna Goodison, Jamaican poet and author 1947 – Chantal Montellier, French comics creator and artist 1948 – Avi Arad, Israeli-American screenwriter and producer, founded Marvel Studios 1948 – Cliff Branch, American football player (d. 2019) 1948 – David Gemmell, English journalist and author (d. 2006) 1949 – Kurmanbek Bakiyev, Kyrgyzstani politician, 2nd President of Kyrgyzstan 1949 – Jim Carroll, American poet, author, and musician (d. 2009) 1949 – Ray Nettles, American football player (d. 2009) 1950 – Roy Williams, American basketball player and coach 1951 – Tim Bachman, Canadian singer-songwriter and guitarist 1951 – Tommy Bolin, American singer-songwriter and guitarist (d. 1976) 1951 – Pete Mackanin, American baseball player, coach, and manager 1952 – Zoran Đinđić, Serbian philosopher and politician, 6th Prime Minister of Serbia (d. 2003) 1953 – Robert Cray, American blues singer-songwriter and guitarist 1953 – Howard Kurtz, American journalist and author 1954 – Trevor Berbick, Jamaican-Canadian boxer (d. 2006) 1954 – James Gleick, American journalist and author 1954 – Benno Möhlmann, German footballer and manager 1957 – Anne-Marie Hutchinson, British lawyer (d. 2020) 1957 – Taylor Negron, American actor and screenwriter (d. 2015) 1958 – Rob Buck, American guitarist and songwriter (d. 2000) 1958 – Michael Penn, American singer-songwriter and guitarist 1958 – Kiki Vandeweghe, American basketball player and coach 1959 – Joe Elliott, English singer-songwriter, guitarist, and producer 1960 – Chuck D, American rapper and songwriter 1960 – Suzi Gardner, American rock singer-songwriter and guitarist 1962 – Jacob Matlala, South African boxer (d. 2013) 1963 – Demián Bichir, Mexican-American actor and producer 1963 – Coolio, American rapper, producer, and actor 1963 – John Carroll Lynch, American actor 1963 – Koichi Wakata, Japanese astronaut and engineer 1963 – Dean Wareham, New Zealand singer-songwriter and guitarist 1964 – Adam Duritz, American singer-songwriter and producer 1964 – Fiona Hyslop, Scottish businesswoman and politician 1964 – Augusta Read Thomas, American composer, conductor and educator 1965 – Brandt Jobe, American golfer 1965 – Sam Mendes, English director and producer 1966 – James St. James, American club promoter and author 1967 – Gregg Jefferies, American baseball player and coach 1967 – José Padilha, Brazilian director, producer and screenwriter 1968 – Stacey Augmon, American basketball player and coach 1968 – Dan Donegan, American heavy metal guitarist and songwriter 1968 – Shigetoshi Hasegawa, Japanese baseball player and sportscaster 1969 – Andrei Borissov, Estonian footballer and manager 1969 – Kevin Jarvis, American baseball player and scout 1969 – Graham Thorpe, English cricketer and journalist 1970 – Quentin Coryatt, American football player 1970 – David James, English footballer and manager 1970 – Eugenie van Leeuwen, Dutch cricketer 1972 – Nicke Andersson, Swedish singer-songwriter and guitarist 1972 – Christer Basma, Norwegian footballer and coach 1972 – Todd Bouman, American football player and coach 1972 – Thomas Woods, American historian, economist, and academic 1973 – Gregg Berhalter, American soccer player and coach 1973 – Veerle Dejaeghere, Belgian runner 1973 – Edurne Pasaban, Spanish mountaineer 1974 – Cher Calvin, American journalist 1974 – Marek Galiński, Polish cyclist (d. 2014) 1974 – Tyron Henderson, South African cricketer 1974 – Dennis Lawrence, Trinidadian footballer and coach 1974 – Beckie Scott, Canadian skier 1975 – Vhrsti, Czech author and illustrator 1976 – Don Hertzfeldt, American animator, producer, screenwriter, and voice actor 1976 – Søren Jochumsen, Danish footballer 1976 – Nwankwo Kanu, Nigerian footballer 1976 – David Nemirovsky, Canadian ice hockey player 1976 – Hasan Şaş, Turkish footballer and manager 1976 – Cristian Stoica, Romanian-Italian rugby player 1977 – Marc Denis, Canadian ice hockey player and sportscaster 1977 – Haspop, French-Moroccan dancer, choreographer, and actor 1977 – Darnerien McCants, American-Canadian football player 1977 – Damien Saez, French singer-songwriter and guitarist 1977 – Yoshi Tatsu, Japanese wrestler and boxer 1978 – Andy Blignaut, Zimbabwean cricketer 1978 – Björn Ferry, Swedish biathlete 1978 – Dhani Harrison, English singer-songwriter and guitarist 1978 – Chris Iwelumo, Scottish footballer 1978 – Edgerrin James, American football player 1979 – Junior Agogo, Ghanaian footballer 1979 – Nathan Fien, Australian-New Zealand rugby league player 1979 – Jason Momoa, American actor, director, and producer 1980 – Mancini, Brazilian footballer 1980 – Romain Barras, French decathlete 1980 – Esteban Paredes, Chilean footballer 1981 – Dean Cox, Australian footballer 1981 – Pia Haraldsen, Norwegian journalist and author 1981 – Christofer Heimeroth, German footballer 1981 – Stephen Hunt, Irish footballer 1981 – Jamie Jones-Buchanan, English rugby player 1982 – Basem Fathi, Jordanian footballer 1982 – Montserrat Lombard, English actress, director, and screenwriter 1983 – Bobby Carpenter, American football player 1983 – Craig Clarke, New Zealand rugby player 1983 – Julien Faubert, French footballer 1983 – David Gervasi, Swiss decathlete 1984 – Steve Feak, American game designer 1984 – Francesco Gavazzi, Italian cyclist 1984 – Brandon Kintzler, American baseball player 1984 – Bastian Schweinsteiger, German footballer 1985 – Stuart Holden, Scottish-American soccer player 1985 – Adam Jones, American baseball player 1985 – Cole Kimball, American baseball player 1985 – Tendai Mtawarira, South African rugby player 1985 – Kris Stadsgaard, Danish footballer 1985 – Dušan Švento, Slovak footballer 1986 – Damien Allen, English footballer 1986 – Anton Strålman, Swedish ice hockey player 1986 – Andrew Taylor, English footballer 1986 – Elena Vesnina, Russian tennis player 1986 – Mike Wallace, American football player 1987 – Iago Aspas, Spanish footballer 1987 – Karen Carney, English women's football winger 1987 – Sébastien Pocognoli, Belgian footballer 1987 – Lee Wallace, Scottish footballer 1987 – Taapsee Pannu, Indian actress 1988 – Mustafa Abdellaoue, Norwegian footballer 1988 – Nemanja Matić, Serbian footballer 1988 – Patryk Małecki, Polish footballer 1988 – Bodene Thompson, New Zealand rugby league player 1989 – Madison Bumgarner, American baseball player 1989 – Tiffany Hwang, Korean American singer, songwriter, and actress 1990 – Aledmys Díaz, Cuban baseball player 1990 – Elton Jantjies, South African rugby player 1991 – Piotr Malarczyk, Polish footballer 1991 – Marco Puntoriere, Italian footballer 1992 – Austin Rivers, American basketball player 1992 – Mrunal Thakur, Indian actress 1993 – Álex Abrines, Spanish basketball player 1993 – Leon Thomas III, American actor and singer 1994 – Sergeal Petersen, South African rugby player 1994 – Ayaka Wada, Japanese singer 1995 – Madison Cawthorn, American politician 1996 – Katie Boulter, English tennis player 2001 – Park Si-eun, South Korean actress Deaths Pre-1600 30 BC – Mark Antony, Roman general and politician (b. 83 BC) 371 – Eusebius of Vercelli, Italian bishop and saint (b. 283) 527 – Justin I, Byzantine emperor (b. 450) 873 – Thachulf, duke of Thuringia 946 – Ali ibn Isa al-Jarrah, Abbasid vizier (b. 859) 946 – Lady Xu Xinyue, Chinese queen (b. 902) 953 – Yingtian, Chinese Khitan empress (b. 879) 984 – Æthelwold, bishop of Winchester 1098 – Adhemar of Le Puy, French papal legate 1137 – Louis VI, king of France (b. 1081) 1146 – Vsevolod II of Kiev, Russian prince 1227 – Shimazu Tadahisa, Japanese warlord (b. 1179) 1252 – Giovanni da Pian del Carpine, Italian archbishop and explorer (b. 1180) 1299 – Conrad de Lichtenberg, Bishop of Strasbourg (b. 1240) 1402 – Edmund of Langley, 1st Duke of York, English politician, Lord Warden of the Cinque Ports (b. 1341) 1457 – Lorenzo Valla, Italian author and educator (b. 1406) 1464 – Cosimo de' Medici, Italian ruler (b. 1386) 1494 – Giovanni Santi, artist and father of Raphael (b. c. 1435) 1541 – Simon Grynaeus, German theologian and scholar (b. 1493) 1543 – Magnus I, Duke of Saxe-Lauenburg (b. 1488) 1546 – Peter Faber, French Jesuit theologian (b. 1506) 1557 – Olaus Magnus, Swedish archbishop, historian, and cartographer (b. 1490) 1580 – Albrecht Giese, Polish-German politician and diplomat (b. 1524) 1589 – Jacques Clément, French assassin of Henry III of France (b. 1567) 1601–1900 1603 – Matthew Browne, English politician (b. 1563) 1714 – Anne, Queen of Great Britain (b. 1665) 1787 – Alphonsus Maria de' Liguori, Italian bishop and saint (b. 1696) 1795 – Clas Bjerkander, Swedish meteorologist, botanist, and entomologist (b. 1735) 1796 – Sir Robert Pigot, 2nd Baronet, English colonel and politician (b. 1720) 1797 – Emanuel Granberg, Finnish church painter (b. 1754) 1798 – François-Paul Brueys d'Aigalliers, French admiral (b. 1753) 1807 – John Boorman, English cricketer (b. c. 1754) 1807 – John Walker, English actor, philologist, and lexicographer (b. 1732) 1808 – Lady Diana Beauclerk, English painter and illustrator (b. 1734) 1812 – Yakov Kulnev, Russian general (b. 1763) 1851 – William Joseph Behr, German publicist and academic (b. 1775) 1863 – Jind Kaur Majarani (Regent) of the Sikh Empire (b. 1817) 1866 – John Ross, American tribal chief (b. 1790) 1869 – Peter Julian Eymard, French Priest and Founder Congregation of the Blessed Sacrament (b. 1811) 1869 – Richard Dry, Australian politician, 7th Premier of Tasmania (b. 1815) 1901–present 1903 – Calamity Jane, American frontierswoman and scout (b. 1853) 1911 – Edwin Austin Abbey, American painter and illustrator (b. 1852) 1911 – Samuel Arza Davenport, American lawyer and politician (b. 1843) 1918

previously governor of Germania Inferior as well as a new man. Under instructions from the emperor, Lollius undertook an invasion of southern Scotland, winning some significant victories, and constructing the Antonine Wall from the Firth of Forth to the Firth of Clyde. The wall, however, was soon gradually decommissioned during the mid-150s and eventually abandoned late during the reign (early 160s), for reasons that are still not quite clear. Antonine's Wall is mentioned in just one literary source, Antoninus' biography in the Historia Augusta. Pausanias makes a brief and confused mention of a war in Britain. In one inscription honoring Antoninus, erected by Legio II Augusta, which participated in the building of the Wall, a relief showing four naked prisoners, one of them beheaded, seems to stand for some actual warfare. Although Antonine's Wall was, in principle, much shorter (37 miles in length as opposed to 73) and at first sight more defensible than Hadrian's Wall, the additional area that it enclosed within the Empire was barren, with land use for grazing already in decay. This meant that supply lines to the wall were strained enough such as the costs for maintaining the additional territory outweighed the benefits of doing so. Also, in the absence of urban development and the ensuing Romanization process, the rear of the wall could not be lastingly pacified. It has been therefore speculated that the invasion of Lowland Scotland and the building of the wall had to do mostly with internal politics, that is, offering Antoninus an opportunity to gain some modicum of necessary military prestige at the start of his reign. Actually, the campaign in Britannia was followed by an Imperial salutation, that is, by Antoninus formally taking for the second (and last) time the title of Imperator in 142. The fact that around the same time coins were struck announcing a victory in Britain points to Antoninus' need to publicize his achievements. The orator Fronto was later to say that, although Antoninus bestowed the direction of the British campaign to others, he should be regarded as the helmsman who directed the voyage, whose glory, therefore, belonged to him. That this quest for some military achievement responded to an actual need is proved by the fact that, although generally peaceful, Antoninus' reign was not free from attempts at usurpation: Historia Augusta mentions two, made by the senators Cornelius Priscianus ("for disturbing the peace of Spain"; Priscianus had also been Lollius Urbicus' successor as governor of Britain) and Atilius Rufius Titianus (possibly a troublemaker already exiled under Hadrian.) Both attempts are confirmed by the Fasti Ostienses as well as by the erasing of Priscianus' name from an inscription. In both cases, Antoninus was not in formal charge of the ensuing repression: Priscianus committed suicide and Titianus was found guilty by the Senate, with Antoninus abstaining from sequestering their families' properties. There were also some troubles in Dacia Inferior which required the granting of additional powers to the procurator governor and the dispatch of additional soldiers to the province. On the Northern Black Sea coast, the Greek city of Olbia was held against the Scythians. Also during his reign the governor of Upper Germany, probably Caius Popillius Carus Pedo, built new fortifications in the Agri Decumates, advancing the Limes Germanicus fifteen miles forward in his province and neighboring Raetia. In the East, Roman suzerainty over Armenia was retained by the choice in AD 140 of Arsacid scion Sohaemus as client king. Nevertheless, Antoninus was virtually unique among emperors in that he dealt with these crises without leaving Italy once during his reign, but instead dealt with provincial matters of war and peace through their governors or through imperial letters to the cities such as Ephesus (of which some were publicly displayed). This style of government was highly praised by his contemporaries and by later generations. Antoninus was the last Roman Emperor recognised by the Indian Kingdoms, especially the Kushan Empire. Raoul McLaughlin quotes Aurelius Victor as saying "The Indians, the Bactrians and the Hyrcanians all sent ambassadors to Antoninus. They had all heard about the spirit of justice held by this great emperor, justice that was heightened by his handsome and grave countenance, and his slim and vigorous figure." Due to the outbreak of the Antonine epidemic and wars against northern Germanic tribes, the reign of Marcus Aurelius was forced to alter the focus of foreign policies, and matters relating to the Far East were increasingly abandoned in favour of those directly concerning the Empire's survival. Economy and administration Antoninus was regarded as a skilled administrator and as a builder. In spite of an extensive building directive—the free access of the people of Rome to drinking water was expanded with the construction of aqueducts, not only in Rome but throughout the Empire, as well as bridges and roads—the emperor still managed to leave behind a sizable public treasury of around 2.7 billion sesterces. Rome would not witness another Emperor leaving his successor with a surplus for a long time, but this treasury was depleted almost immediately after Antoninus's reign due to the Antonine Plague brought back by soldiers after the Parthian victory. The Emperor also famously suspended the collection of taxes from cities affected by natural disasters, such as when fires struck Rome and Narbona, and earthquakes affected Rhodes and the Province of Asia. He offered hefty financial grants for rebuilding and recovery of various Greek cities after two serious earthquakes: the first, circa 140, which affected mostly Rhodes and other islands; the second, in 152, which hit Cyzicus (where the huge and newly built Temple to Hadrian was destroyed), Ephesus, and Smyrna. Antoninus' financial help earned him praise by Greek writers such as Aelius Aristides and Pausanias. These cities received from Antoninus the usual honorific accolades, such as when he commanded that all governors of Asia should enter the province, when taking office, by way of Ephesus. Ephesus was specially favoured by Antoninus, who confirmed and upheld its distinction of having two temples for the imperial cult (neocorate), therefore having first place in the list of imperial honor titles, surpassing both Smyrna and Pergamon. In his dealings with Greek-speaking cities, Antoninus followed the policy adopted by Hadrian of ingratiating himself with local elites, especially with local intellectuals: philosophers, teachers of literature, rhetoricians and physicians were explicitly exempted from any duties involving private spending for civic purposes, a privilege granted by Hadrian that Antoninus confirmed by means of an edict preserved in the Digest (27.1.6.8). Antoninus also created a chair for the teaching of rhetoric in Athens. Antoninus was known as an avid observer of rites of religion and of formal celebrations, both Roman and foreign. He is known for having increasingly formalized the official cult offered to the Great Mother, which from his reign onwards included a bull sacrifice, a taurobolium, formerly only a private ritual, now being also performed for the sake of the Emperor's welfare. Antoninus also offered patronage to the worship of Mithras, to whom he erected a temple in Ostia. In 148, he presided over the celebrations of the 900th anniversary of the founding of Rome. Legal reforms Antoninus tried to portray himself as a magistrate of the res publica, no matter how extended and ill-defined his competencies were. He is credited with the splitting of the imperial treasury, the fiscus. This splitting had to do with the division of imperial properties into two parts. Firstly, the fiscus itself, or patrimonium, meaning the properties of the "Crown", the hereditary properties of each succeeding person that sat on the throne, transmitted to his successors in office, regardless of their previous membership in the imperial family. Secondly, the res privata, the "private" properties tied to the personal maintenance of the Emperor and his family, something like a Privy Purse. An anecdote in the Historia Augusta biography, where Antoninus replies to Faustina (who complained about his stinginess) that "we have gained an empire [and] lost even what we had before" possibly relates to Antoninus' actual concerns at the creation of the res privata. While still a private citizen, Antoninus had increased his personal fortune greatly by mean of various legacies, the consequence of his caring scrupulously for his relatives. Also, Antoninus left behind him a reputation for stinginess and was probably determined not to leave his personal property to be "swallowed up by the demands of the imperial throne". The res privata lands could be sold and/or given away, while the patrimonium properties were regarded as public. It was a way of pretending that the Imperial function—and most properties attached to it—was a public one, formally subject to the authority of the Senate and the Roman people. That the distinction played no part in subsequent political history—that the personal power of the princeps absorbed his role as office-holder—proves that the autocratic logic of the imperial order had already subsumed the old republican institutions. Of the public transactions of this period there is only the scantiest of information, but, to judge by what is extant, those twenty-two years were not remarkably eventful in comparison to those before and after the reign. However, Antoninus did take a great interest in the revision and practice of the law throughout the empire. One of his chief concerns was to having local communities conform their legal procedures to existing Roman norms: in a case concerning repression of banditry by local police officers ("irenarchs", Greek for "peace keepers") in Asia Minor, Antoninus ordered that these officers should not treat suspects as already condemned, and also keep a detailed copy of their interrogations, to be used in the possibility of an appeal to the Roman governor. Also, although Antoninus was not an innovator, he would not always follow the absolute letter of the law; rather he was driven by concerns over humanity and equality, and introduced into Roman law many important new principles based upon this notion. In this, the emperor was assisted by five chief lawyers: Lucius Fulvius Aburnius Valens, an author of legal treatises; Lucius Ulpius Marcellus, a prolific writer; and three others. Of these three, the most prominent was Lucius Volusius Maecianus, a former military officer turned by Antoninus into a civil procurator, and who, in view of his subsequent career (discovered on the basis of epigraphical and prosopographical research), was the Emperor's most important legal adviser. Maecianus would eventually be chosen to occupy various prefectures (see below) as well as to conduct the legal studies of Marcus Aurelius. He was also the author of a large work on Fidei commissa (Testamentary Trusts). As a hallmark of the increased connection between jurists and the imperial government, Antoninus' reign also saw the appearance of the Institutes of Gaius, an elementary legal manual for beginners (see Gaius (jurist)). Antoninus passed measures to facilitate the enfranchisement of slaves. Mostly, he favoured the principle of favor libertatis, giving the putative freedman the benefit of the doubt when the claim to freedom was not clearcut. Also, he punished the killing of a slave by his/her master without previous trial and determined that slaves could be forcibly sold to another master by a proconsul in cases of consistent mistreatment. Antoninus upheld the enforcement of contracts for selling of female slaves forbidding their further employment in prostitution. In criminal law, Antoninus introduced the important principle that accused persons are not to be treated as guilty before trial, as in the case of the irenarchs (see above). It was to Antonius that the Christian apologist Justin Martyr addressed his defense of the Christian faith, reminding him of his father's (Emperor Hadrian's) rule that accusations against Christians required proof. He also asserted the principle that the trial was to be held, and the punishment inflicted, in the place where the crime had been committed. He mitigated the use of torture in examining slaves by certain limitations. Thus he prohibited the application of torture to children under fourteen years, though this rule had exceptions. However, it must be stressed that Antoninus extended, by means of a rescript, the use of torture

Gallia Narbonensis during the late second century. Antoninus' father had no other children and died shortly after his 89 ordinary consulship. Antoninus was raised by his maternal grandfather Gnaeus Arrius Antoninus, reputed by contemporaries to be a man of integrity and culture and a friend of Pliny the Younger. The Arrii Antonini were an older senatorial family from Italy, very influential during Nerva's reign. Arria Fadilla, Antoninus' mother, married afterwards Publius Julius Lupus, suffect consul in 98; from that marriage came two daughters, Arria Lupula and Julia Fadilla. Marriage and children Some time between 110 and 115, Antoninus married Annia Galeria Faustina the Elder. They are believed to have enjoyed a happy marriage. Faustina was the daughter of consul Marcus Annius Verus (II) and Rupilia Faustina (a half-sister to the Empress Vibia Sabina). Faustina was a beautiful woman, and despite (basically unproven) rumours about her character, it is clear that Antoninus cared for her deeply. Faustina bore Antoninus four children, two sons and two daughters. They were: Marcus Aurelius Fulvus Antoninus (died before 138); his sepulchral inscription has been found at the Mausoleum of Hadrian in Rome. Marcus Galerius Aurelius Antoninus (died before 138); his sepulchral inscription has been found at the Mausoleum of Hadrian in Rome. His name appears on a Greek Imperial coin. Aurelia Fadilla (died in 135); she married Lucius Plautius Lamia Silvanus, consul 145. She appeared to have no children with her husband; and her sepulchral inscription has been found in Italy. Annia Galeria Faustina Minor or Faustina the Younger (between 125 and 130–175), a future Roman Empress, married her maternal cousin Marcus Aurelius in 146. When Faustina died in 141, Antoninus was greatly distressed. In honour of her memory, he asked the Senate to deify her as a goddess, and authorised the construction of a temple to be built in the Roman Forum in her name, with priestesses serving in her temple. He had various coins with her portrait struck in her honor. These coins were scripted "DIVA FAUSTINA" and were elaborately decorated. He further founded a charity, calling it Puellae Faustinianae or Girls of Faustina, which assisted destitute girls of good family. Finally, Antoninus created a new alimenta (see Grain supply to the city of Rome). The emperor never remarried. Instead, he lived with Galeria Lysistrate, one of Faustina's freed women. Concubinage was a form of female companionship sometimes chosen by powerful men in Ancient Rome, especially widowers like Vespasian, and Marcus Aurelius. Their union could not produce any legitimate offspring who could threaten any heirs, such as those of Antoninus. Also, as one could not have a wife and an official concubine (or two concubines) at the same time, Antoninus avoided being pressed into a marriage with a noblewoman from another family. (Later, Marcus Aurelius would also reject the advances of his former fiancée Ceionia Fabia, Lucius Verus's sister, on the grounds of protecting his children from a stepmother, and took a concubine instead.) Favour with Hadrian Having filled the offices of quaestor and praetor with more than usual success, he obtained the consulship in 120 having as his colleague Lucius Catilius Severus. He was next appointed by the Emperor Hadrian as one of the four proconsuls to administer Italia, his district including Etruria, where he had estates. He then greatly increased his reputation by his conduct as proconsul of Asia, probably during 134–135. He acquired much favor with Hadrian, who adopted him as his son and successor on 25 February 138, after the death of his first adopted son Lucius Aelius, on the condition that Antoninus would in turn adopt Marcus Annius Verus, the son of his wife's brother, and Lucius, son of Lucius Aelius, who afterwards became the emperors Marcus Aurelius and Lucius Verus. He also adopted (briefly) the name Imperator Titus Aelius Caesar Antoninus, in preparation for his rule.There seems to have been some opposition to Antoninus' appointment on the part of other potential claimants, among them his former consular colleague Lucius Catilius Severus, then prefect of the city. Nevertheless, Antoninus assumed power without opposition. Emperor On his accession, Antoninus' name and style became Imperator Caesar Titus Aelius Hadrianus Antoninus Augustus Pontifex Maximus. One of his first acts as Emperor was to persuade the Senate to grant divine honours to Hadrian, which they had at first refused; his efforts to persuade the Senate to grant these honours is the most likely reason given for his title of Pius (dutiful in affection; compare pietas). Two other reasons for this title are that he would support his aged father-in-law with his hand at Senate meetings, and that he had saved those men that Hadrian, during his period of ill-health, had condemned to death. Immediately after Hadrian's death, Antoninus approached Marcus and requested that his marriage arrangements be amended: Marcus' betrothal to Ceionia Fabia would be annulled, and he would be betrothed to Faustina, Antoninus' daughter, instead. Faustina's betrothal to Ceionia's brother Lucius Commodus would also have to be annulled. Marcus consented to Antoninus' proposal. Antoninus built temples, theaters, and mausoleums, promoted the arts and sciences, and bestowed honours and financial rewards upon the teachers of rhetoric and philosophy. Antoninus made few initial changes when he became emperor, leaving intact as far as possible the arrangements instituted by Hadrian. Epigraphical and prosopographical research has revealed that Antoninus' imperial ruling team centered around a group of closely knit senatorial families, most of them members of the priestly congregation for the cult of Hadrian, the sodales Hadrianales. According to the German historian H.G. Pflaum, prosopographical research of Antoninus' ruling team allows us to grasp the deeply conservative character of the ruling senatorial caste. A non-military reign There are no records of any military related acts in his time in which he participated. One modern scholar has written "It is almost certain not only that at no time in his life did he ever see, let alone command, a Roman army, but that, throughout the twenty-three years of his reign, he never went within five hundred miles of a legion". His reign was the most peaceful in the entire history of the Principate, notwithstanding the fact that there were several military disturbances throughout the Empire in his time. Such disturbances happened in Mauretania, where a senator was named as governor of Mauretania Tingitana in place of the usual equestrian procurator and cavalry reinforcements from Pannonia were brought in, towns such as Sala and Tipasa being fortified. Similar disturbances took place in Judea, and amongst the Brigantes in Britannia, none of them being considered serious. It was however in Britain that Antoninus decided to follow a new, more aggressive path, with the appointment of a new governor in 139, Quintus Lollius Urbicus, a native of Numidia and previously governor of Germania Inferior as well as a new man. Under instructions from the emperor, Lollius undertook an invasion of southern Scotland, winning some significant victories, and constructing the Antonine Wall from the Firth of Forth to the Firth of Clyde. The wall, however, was soon gradually decommissioned during the mid-150s and eventually abandoned late during the reign (early 160s), for reasons that are still not quite clear. Antonine's Wall is mentioned in just one literary source, Antoninus' biography in the Historia Augusta. Pausanias makes a brief and confused mention of a war in Britain. In one inscription honoring Antoninus, erected by Legio II Augusta, which participated in the building of the Wall, a relief showing four naked prisoners, one of them beheaded, seems to stand for some actual warfare. Although Antonine's Wall was, in principle, much shorter (37 miles in length as opposed to 73) and at first sight more defensible than Hadrian's Wall, the additional area that it enclosed within the Empire was barren, with land use for grazing already in decay. This meant that supply lines to the wall were strained enough such as the costs for maintaining the additional territory outweighed the benefits of doing so. Also, in the absence of urban development and the ensuing Romanization process, the rear of the wall could not be lastingly pacified. It has been therefore speculated that the invasion of Lowland Scotland and the building of the wall had to do mostly with internal politics, that is, offering Antoninus an opportunity to gain some modicum of necessary military prestige at the start of his reign. Actually, the campaign in Britannia was followed by an Imperial salutation, that is, by Antoninus formally taking for the second (and last) time the title of Imperator in 142. The fact that around the same time coins were struck announcing a victory in Britain points to Antoninus' need to publicize his achievements. The orator Fronto was later to say that, although Antoninus bestowed the direction of the British campaign to others, he should be regarded as the helmsman who directed the voyage, whose glory, therefore, belonged to him. That this quest for some military achievement responded to an actual need is proved by the fact that, although generally peaceful, Antoninus' reign was not free from attempts at usurpation: Historia Augusta mentions two, made by the senators Cornelius Priscianus ("for disturbing the peace of Spain"; Priscianus had also been Lollius Urbicus' successor as governor of Britain) and Atilius Rufius Titianus (possibly a troublemaker already exiled under Hadrian.) Both attempts are confirmed by the Fasti Ostienses as well as by the erasing of Priscianus' name from an inscription. In both cases, Antoninus was not in formal charge of the ensuing repression: Priscianus committed suicide and Titianus was found guilty by the Senate, with Antoninus abstaining from sequestering their families' properties. There were also some troubles in Dacia Inferior which required the granting of additional powers to the procurator governor and the dispatch of additional soldiers to the province. On the Northern Black Sea coast, the Greek city of Olbia was held against the Scythians. Also during his reign the governor of Upper Germany, probably Caius Popillius Carus Pedo, built new fortifications in the Agri Decumates, advancing the Limes Germanicus fifteen miles forward in his province and neighboring Raetia. In the East, Roman suzerainty over Armenia was retained by the choice in AD 140 of Arsacid scion Sohaemus as client king. Nevertheless, Antoninus was virtually unique among emperors in that he dealt with these crises without leaving Italy once during his reign, but instead dealt with provincial matters of war and peace through their governors or through imperial letters to the cities such as Ephesus (of which some were publicly displayed). This style of government was highly praised by his contemporaries and by later generations. Antoninus was the last Roman Emperor recognised by the Indian Kingdoms, especially the Kushan Empire. Raoul McLaughlin quotes Aurelius Victor as saying "The Indians, the Bactrians and the Hyrcanians all sent ambassadors to Antoninus. They had all heard about the spirit of justice held by this great emperor, justice that was heightened by his handsome and grave countenance, and his slim and vigorous figure." Due to the outbreak of the Antonine epidemic and wars against northern Germanic tribes, the reign of Marcus Aurelius was forced to

Shavers, American trumpet player and composer (d. 1971) 1920 – Elmar Tampõld, Estonian-Canadian architect (d. 2013) 1921 – Richard Adler, American composer and producer (d. 2012) 1921 – Marilyn Maxwell, American actress (d. 1972) 1922 – John Eisenhower, American historian, general, and diplomat, 45th United States Ambassador to Belgium (d. 2013) 1923 – Jean Hagen, American actress (d. 1977) 1923 – Pope Shenouda III of Alexandria (d. 2012) 1924 – Connie Converse, American musician and singer-songwriter 1924 – Leon Uris, American soldier and author (d. 2003) 1925 – Marv Levy, American-Canadian football player, coach, and manager 1925 – Lewis Rowland, American neurologist (d. 2017) 1926 – Rona Anderson, Scottish actress (d. 2013) 1926 – Tony Bennett, American singer and actor 1926 – Anthony Sampson, English journalist and author (d. 2004) 1926 – Gordon Scott, American actor (d. 2007) 1928 – Cécile Aubry, French actress, director, and screenwriter (d. 2010) 1928 – Henning Moritzen, Danish actor (d. 2012) 1930 – James Komack, American actor, director, producer, and screenwriter (d. 1997) 1933 – Pat Crawford, Australian cricketer (d. 2009) 1934 – Haystacks Calhoun, American wrestler and actor (d. 1989) 1934 – Michael Chapman, English bassoon player (d. 2005) 1934 – Jonas Savimbi, Angolan general, founded UNITA (d. 2002) 1935 – John Erman, American actor, director, and producer 1935 – Georgy Shonin, Ukrainian-Russian general, pilot, and astronaut (d. 1997) 1935 – Vic Vogel, Canadian pianist, composer, and bandleader (d. 2019) 1936 – Jerry G. Bishop, American radio and television host (d. 2013) 1936 – Edward Petherbridge, English actor 1937 – Steven Berkoff, English actor, director, and playwright 1937 – Roland Burris, American lawyer and politician, 39th Illinois Attorney General 1937 – Duncan Sharpe, Pakistani-Australian cricketer 1938 – Terry Wogan, Irish radio and television host (d. 2016) 1939 – Jimmie Nicol, English drummer 1939 – Apoorva Sengupta, Indian general and cricketer (d. 2013) 1940 – Lance Alworth, American football player 1940 – Martin Sheen, American actor and producer 1940 – James Tyler, American guitarist and songwriter (d. 2010) 1941 – Beverly Lee, American singer 1941 – Martha Stewart, American businesswoman, publisher, and author, founded Martha Stewart Living Omnimedia 1943 – Béla Bollobás, Hungarian-English mathematician and academic 1943 – Princess Christina, Mrs. Magnuson of Sweden 1943 – Steven Millhauser, American novelist and short story writer 1944 – Morris Berman, American historian and social critic 1944 – Nino Bravo, Spanish singer (d. 1973) 1945 – Eamon Dunphy, Irish footballer and journalist 1946 – Robert Ayling, English businessman 1946 – Jack Straw, English lawyer and politician, Shadow Deputy Prime Minister of the United Kingdom 1946 – Syreeta Wright, American singer-songwriter (d. 2004) 1946 – John York, American bass player, songwriter, and producer 1947 – Ralph Wright, English footballer (d. 2020) 1948 – Jean-Pierre Raffarin, French lawyer and politician, 166th Prime Minister of France 1949 – Philip Casnoff, American actor and director 1949 – B. B. Dickerson, American bass player and songwriter 1949 – Sue Slipman, English politician 1950 – Linda Howard, American author 1950 – John Landis, American actor, director, producer, and screenwriter 1950 – Jo Marie Payton, American actress and singer 1950 – Ernesto Samper, Colombian economist and politician, 29th President of Colombia 1951 – Marcel Dionne, Canadian ice hockey player 1951 – Jay North, American actor 1952 – Osvaldo Ardiles, Argentinian footballer and manager 1953 – Ian Bairnson, Scottish saxophonist and keyboard player 1953 – Marlene Dumas, South African painter 1954 – Michael Arthur, English physician and academic 1954 – Gary Peters, English footballer and manager 1956 – Kirk Brandon, English singer-songwriter and guitarist 1956 – Todd Christensen, American football player and sportscaster (d. 2013) 1956 – Dave Cloud, American singer-songwriter and actor (d. 2015) 1956 – Balwinder Sandhu, Indian cricketer and coach 1957 – Bodo Rudwaleit, German footballer and manager 1957 – Kate Wilkinson, New Zealand lawyer and politician, 11th New Zealand Minister of Conservation 1958 – Lindsey Hilsum, English journalist and author 1958 – Ana Kokkinos, Australian director and screenwriter 1959 – Martin Atkins, English drummer and producer 1959 – Mike Gminski, American basketball player and sportscaster 1959 – John C. McGinley, American actor and producer 1959 – Koichi Tanaka, Japanese chemist and engineer, Nobel Prize laureate 1960 – Tim Mayotte, American tennis player and coach 1960 – Gopal Sharma, Indian cricketer 1961 – Molly Hagan, American actress 1961 – Nick Harvey, English politician, Minister of State for the Armed Forces 1961 – Lee Rocker, American bassist 1963 – Tasmin Archer, English pop singer 1963 – Frano Botica, New Zealand rugby player and coach 1963 – James Hetfield, American singer-songwriter and guitarist 1963 – David Knox, Australian rugby player 1963 – Ed Roland, American singer-songwriter, guitarist, and producer 1963 – Lisa Ann Walter, American actress, producer, and screenwriter 1963 – Isaiah Washington, American actor and producer 1964 – Lucky Dube, South African singer and keyboard player (d. 2007) 1964 – Ralph Knibbs, British rugby union player 1964 – Nate McMillan, American basketball player and coach 1964 – Kevin Sumlin, American football player and coach 1964 – Abhisit Vejjajiva, English-Thai economist and politician, 27th Prime Minister of Thailand 1966 – Brent Butt, Canadian actor, producer, and screenwriter 1966 – Gizz Butt, English singer-songwriter and guitarist 1966 – Eric Esch, American wrestler, boxer, and mixed martial artist 1967 – Mathieu Kassovitz, French actor, director, producer, and screenwriter, founded MNP Entreprise 1967 – Skin, English singer and guitarist 1968 – Rod Beck, American baseball player (d. 2007) 1969 – Doug Overton, American basketball player and coach 1970 – Stephen Carpenter, American guitarist and songwriter 1970 – Gina G, Australian singer-songwriter 1970 – Masahiro Sakurai, Japanese video game designer 1971 – Forbes Johnston, Scottish footballer (d. 2007) 1971 – DJ Spinderella, American DJ, rapper, producer, and actress 1972 – Sandis Ozoliņš, Latvian ice hockey player and politician 1973 – Jay Cutler, American bodybuilder 1973 – Nikos Dabizas, Greek footballer 1973 – Michael Ealy, American actor 1973 – Chris Murphy, American politician, junior senator of Connecticut 1975 – Wael Gomaa, Egyptian footballer 1975 – Argyro Strataki, Greek heptathlete 1976 – Troy Glaus, American baseball player 1977 – Tom Brady, American football player 1977 – Justin Lehr, American baseball player 1977 – Óscar Pereiro, Spanish cyclist and footballer 1978 – Joi Chua, Singaporean singer-songwriter and actress 1978 – Mariusz Jop, Polish footballer 1978 – Jenny Tinmouth, English motorcycle racer 1978 – Dimitrios Zografakis, Greek footballer 1979 – Evangeline Lilly, Canadian actress 1980 – Nadia Ali, Libyan-American singer-songwriter 1980 – Dominic Moore, Canadian ice hockey player 1980 – Tony Pashos, American football player 1980 – Brandan Schieppati, American singer-songwriter and guitarist 1980 – Hannah Simone, Canadian television host and actress 1981 – Fikirte Addis, Ethiopian fashion designer 1981 – Travis Bowyer, American baseball player 1981 – Pablo Ibáñez, Spanish footballer 1982 – Kaspar Kokk, Estonian skier 1982 – Jesse Lumsden, Canadian bobsledder and football player 1982 – Damien Sandow, American wrestler 1983 – Ryan Carter, American ice hockey player 1983 – Mark Reynolds, American baseball player 1984 – Yasin Avcı, Turkish footballer 1984 – Sunil Chhetri, Indian footballer 1984 – Matt Joyce, American baseball player 1984 – Ryan Lochte, American swimmer 1984 – Chris Maurer, American singer and bass player 1985 – Georgina Haig, Australian actress 1985 – Brent Kutzle, American bass player and producer 1985 – Ats Purje, Estonian footballer 1985 – Sonny Bill Williams, New Zealand rugby player and boxer 1986 – Charlotte Casiraghi, Monégasque journalist, co-founded Ever Manifesto 1986 – Darya Domracheva, Belarusian biathlete 1987 – Kim Hyung-jun, South Korean singer and dancer 1987 – Chris McQueen, Australian-English rugby league player 1988 – Denny Cardin, Italian footballer 1988 – Leigh Tiffin, American football player 1988 – Sven Ulreich, German footballer 1989 – Jules Bianchi, French race car driver (d. 2015) 1989 – Sam Hutchinson, English footballer 1989 – Tyrod Taylor, American football player 1989 – Nick Viergever, Dutch footballer 1990 – Jourdan Dunn, English model 1990 – Kang Min-kyung, South Korean singer 1992 – Gamze Bulut, Turkish runner 1992 – Gesa Felicitas Krause, German runner 1992 – Diāna Marcinkēviča, Latvian tennis player 1992 – Aljon Mariano, Filipino basketball player 1992 – Lum Rexhepi, Finnish footballer 1992 – Karlie Kloss, American fashion model 1993 – Ola Abidogun, English sprinter 1993 – Yurina Kumai, Japanese singer 1994 – Manaia Cherrington, New Zealand rugby league player 1994 – Esther Earl, American author, vlogger, and online personality. Celebrated annually as Esther day 1994 – Todd Gurley, American football player 1995 – Victoria Kan, Russian tennis player Deaths Pre-1600 908 – Burchard, duke of Thuringia 908 – Egino, duke of Thuringia 908 – Rudolf I, bishop of Würzburg 925 – Cao, Chinese empress dowager 979 – Thietmar, margrave of Meissen 1003 – At-Ta'i, Abbasid caliph (b. 932) 1355 – Bartholomew de Burghersh, 1st Baron Burghersh, English nobleman 1460 – James II, king of Scotland (b. 1430) 1527 – Scaramuccia Trivulzio, Italian cardinal 1530 – Francesco Ferruccio, Italian captain (b. 1489) 1546 – Antonio da Sangallo the Younger, Italian architect, designed the Apostolic Palace (b. 1484) 1546 – Étienne Dolet, French scholar and translator (b. 1509) 1601–1900 1604 – Bernardino de Mendoza, Spanish commander and diplomat (b. 1540) 1621 – Guillaume du Vair, French lawyer and author (b. 1556) 1712 – Joshua Barnes, English historian and scholar (b. 1654) 1720 – Anthonie Heinsius, Dutch politician (b. 1641) 1721 – Grinling Gibbons, Dutch-English sculptor and woodcarver (b. 1648) 1761 – Johann Matthias Gesner, German scholar and academic (b. 1691) 1773 – Stanisław Konarski, Polish poet and playwright (b. 1700) 1780 – Étienne Bonnot de Condillac, French epistemiologist and philosopher (b. 1715) 1792 – Richard Arkwright, English engineer and businessman (b. 1732) 1797 – Jeffery Amherst, 1st Baron Amherst, English field marshal and politician, Colonial Governor of Virginia (b. 1717) 1805 – Christopher Anstey, English author and poet (b. 1724) 1835 – Wenzel Müller, Austrian composer and conductor (b. 1767) 1839 – Dorothea von Schlegel, German author and translator (b. 1763) 1857 – Eugène Sue, French author and politician (b. 1804) 1866 – Gábor Klauzál, Hungarian politician, Hungarian Minister of Agriculture (b. 1804) 1867 – Philipp August Böckh, German historian and scholar (b. 1785) 1877 – William B. Ogden, American businessman and politician, 1st Mayor of Chicago (b. 1805) 1879 – Joseph Severn, English painter (b. 1793) 1894 – George Inness, American painter (b. 1825) 1901–present 1913 – William Lyne, Australian politician, 13th Premier of New South Wales (b. 1844) 1916 – Roger Casement, Irish poet and activist (b. 1864) 1917 – Ferdinand Georg Frobenius, German mathematician and academic (b. 1849) 1920 – Peeter Süda, Estonian organist and composer (b. 1883) 1922 – Ture Malmgren, Swedish journalist and politician (b. 1851) 1924 – Joseph Conrad, Polish-born British novelist (b. 1857) 1925 – William Bruce, Australian cricketer (b. 1864) 1929 – Emile Berliner, German-American inventor and businessman, invented the phonograph (b. 1851) 1929 – Thorstein Veblen, American economist and sociologist (b. 1857) 1936 – Konstantin Konik, Estonian surgeon and politician, 19th Estonian Minister of Education (b. 1873) 1942 – Richard Willstätter,

President of Colombia 1951 – Marcel Dionne, Canadian ice hockey player 1951 – Jay North, American actor 1952 – Osvaldo Ardiles, Argentinian footballer and manager 1953 – Ian Bairnson, Scottish saxophonist and keyboard player 1953 – Marlene Dumas, South African painter 1954 – Michael Arthur, English physician and academic 1954 – Gary Peters, English footballer and manager 1956 – Kirk Brandon, English singer-songwriter and guitarist 1956 – Todd Christensen, American football player and sportscaster (d. 2013) 1956 – Dave Cloud, American singer-songwriter and actor (d. 2015) 1956 – Balwinder Sandhu, Indian cricketer and coach 1957 – Bodo Rudwaleit, German footballer and manager 1957 – Kate Wilkinson, New Zealand lawyer and politician, 11th New Zealand Minister of Conservation 1958 – Lindsey Hilsum, English journalist and author 1958 – Ana Kokkinos, Australian director and screenwriter 1959 – Martin Atkins, English drummer and producer 1959 – Mike Gminski, American basketball player and sportscaster 1959 – John C. McGinley, American actor and producer 1959 – Koichi Tanaka, Japanese chemist and engineer, Nobel Prize laureate 1960 – Tim Mayotte, American tennis player and coach 1960 – Gopal Sharma, Indian cricketer 1961 – Molly Hagan, American actress 1961 – Nick Harvey, English politician, Minister of State for the Armed Forces 1961 – Lee Rocker, American bassist 1963 – Tasmin Archer, English pop singer 1963 – Frano Botica, New Zealand rugby player and coach 1963 – James Hetfield, American singer-songwriter and guitarist 1963 – David Knox, Australian rugby player 1963 – Ed Roland, American singer-songwriter, guitarist, and producer 1963 – Lisa Ann Walter, American actress, producer, and screenwriter 1963 – Isaiah Washington, American actor and producer 1964 – Lucky Dube, South African singer and keyboard player (d. 2007) 1964 – Ralph Knibbs, British rugby union player 1964 – Nate McMillan, American basketball player and coach 1964 – Kevin Sumlin, American football player and coach 1964 – Abhisit Vejjajiva, English-Thai economist and politician, 27th Prime Minister of Thailand 1966 – Brent Butt, Canadian actor, producer, and screenwriter 1966 – Gizz Butt, English singer-songwriter and guitarist 1966 – Eric Esch, American wrestler, boxer, and mixed martial artist 1967 – Mathieu Kassovitz, French actor, director, producer, and screenwriter, founded MNP Entreprise 1967 – Skin, English singer and guitarist 1968 – Rod Beck, American baseball player (d. 2007) 1969 – Doug Overton, American basketball player and coach 1970 – Stephen Carpenter, American guitarist and songwriter 1970 – Gina G, Australian singer-songwriter 1970 – Masahiro Sakurai, Japanese video game designer 1971 – Forbes Johnston, Scottish footballer (d. 2007) 1971 – DJ Spinderella, American DJ, rapper, producer, and actress 1972 – Sandis Ozoliņš, Latvian ice hockey player and politician 1973 – Jay Cutler, American bodybuilder 1973 – Nikos Dabizas, Greek footballer 1973 – Michael Ealy, American actor 1973 – Chris Murphy, American politician, junior senator of Connecticut 1975 – Wael Gomaa, Egyptian footballer 1975 – Argyro Strataki, Greek heptathlete 1976 – Troy Glaus, American baseball player 1977 – Tom Brady, American football player 1977 – Justin Lehr, American baseball player 1977 – Óscar Pereiro, Spanish cyclist and footballer 1978 – Joi Chua, Singaporean singer-songwriter and actress 1978 – Mariusz Jop, Polish footballer 1978 – Jenny Tinmouth, English motorcycle racer 1978 – Dimitrios Zografakis, Greek footballer 1979 – Evangeline Lilly, Canadian actress 1980 – Nadia Ali, Libyan-American singer-songwriter 1980 – Dominic Moore, Canadian ice hockey player 1980 – Tony Pashos, American football player 1980 – Brandan Schieppati, American singer-songwriter and guitarist 1980 – Hannah Simone, Canadian television host and actress 1981 – Fikirte Addis, Ethiopian fashion designer 1981 – Travis Bowyer, American baseball player 1981 – Pablo Ibáñez, Spanish footballer 1982 – Kaspar Kokk, Estonian skier 1982 – Jesse Lumsden, Canadian bobsledder and football player 1982 – Damien Sandow, American wrestler 1983 – Ryan Carter, American ice hockey player 1983 – Mark Reynolds, American baseball player 1984 – Yasin Avcı, Turkish footballer 1984 – Sunil Chhetri, Indian footballer 1984 – Matt Joyce, American baseball player 1984 – Ryan Lochte, American swimmer 1984 – Chris Maurer, American singer and bass player 1985 – Georgina Haig, Australian actress 1985 – Brent Kutzle, American bass player and producer 1985 – Ats Purje, Estonian footballer 1985 – Sonny Bill Williams, New Zealand rugby player and boxer 1986 – Charlotte Casiraghi, Monégasque journalist, co-founded Ever Manifesto 1986 – Darya Domracheva, Belarusian biathlete 1987 – Kim Hyung-jun, South Korean singer and dancer 1987 – Chris McQueen, Australian-English rugby league player 1988 – Denny Cardin, Italian footballer 1988 – Leigh Tiffin, American football player 1988 – Sven Ulreich, German footballer 1989 – Jules Bianchi, French race car driver (d. 2015) 1989 – Sam Hutchinson, English footballer 1989 – Tyrod Taylor, American football player 1989 – Nick Viergever, Dutch footballer 1990 – Jourdan Dunn, English model 1990 – Kang Min-kyung, South Korean singer 1992 – Gamze Bulut, Turkish runner 1992 – Gesa Felicitas Krause, German runner 1992 – Diāna Marcinkēviča, Latvian tennis player 1992 – Aljon Mariano, Filipino basketball player 1992 – Lum Rexhepi, Finnish footballer 1992 – Karlie Kloss, American fashion model 1993 – Ola Abidogun, English sprinter 1993 – Yurina Kumai, Japanese singer 1994 – Manaia Cherrington, New Zealand rugby league player 1994 – Esther Earl, American author, vlogger, and online personality. Celebrated annually as Esther day 1994 – Todd Gurley, American football player 1995 – Victoria Kan, Russian tennis player Deaths Pre-1600 908 – Burchard, duke of Thuringia 908 – Egino, duke of Thuringia 908 – Rudolf I, bishop of Würzburg 925 – Cao, Chinese empress dowager 979 – Thietmar, margrave of Meissen 1003 – At-Ta'i, Abbasid caliph (b. 932) 1355 – Bartholomew de Burghersh, 1st Baron Burghersh, English nobleman 1460 – James II, king of Scotland (b. 1430) 1527 – Scaramuccia Trivulzio, Italian cardinal 1530 – Francesco Ferruccio, Italian captain (b. 1489) 1546 – Antonio da Sangallo the Younger, Italian architect, designed the Apostolic Palace (b. 1484) 1546 – Étienne Dolet, French scholar and translator (b. 1509) 1601–1900 1604 – Bernardino de Mendoza, Spanish commander and diplomat (b. 1540) 1621 – Guillaume du Vair, French lawyer and author (b. 1556) 1712 – Joshua Barnes, English historian and scholar (b. 1654) 1720 – Anthonie Heinsius, Dutch politician (b. 1641) 1721 – Grinling Gibbons, Dutch-English sculptor and woodcarver (b. 1648) 1761 – Johann Matthias Gesner, German scholar and academic (b. 1691) 1773 – Stanisław Konarski, Polish poet and playwright (b. 1700) 1780 – Étienne Bonnot de Condillac, French epistemiologist and philosopher (b. 1715) 1792 – Richard Arkwright, English engineer and businessman (b. 1732) 1797 – Jeffery Amherst, 1st Baron Amherst, English field marshal and politician, Colonial Governor of Virginia (b. 1717) 1805 – Christopher Anstey, English author and poet (b. 1724) 1835 – Wenzel Müller, Austrian composer and conductor (b. 1767) 1839 – Dorothea von Schlegel, German author and translator (b. 1763) 1857 – Eugène Sue, French author and politician (b. 1804) 1866 – Gábor Klauzál, Hungarian politician, Hungarian Minister of Agriculture (b. 1804) 1867 – Philipp August Böckh, German historian and scholar (b. 1785) 1877 – William B. Ogden, American businessman and politician, 1st Mayor of Chicago (b. 1805) 1879 – Joseph Severn, English painter (b. 1793) 1894 – George Inness, American painter (b. 1825) 1901–present 1913 – William Lyne, Australian politician, 13th Premier of New South Wales (b. 1844) 1916 – Roger Casement, Irish poet and activist (b. 1864) 1917 – Ferdinand Georg Frobenius, German mathematician and academic (b. 1849) 1920 – Peeter Süda, Estonian organist and composer (b. 1883) 1922 – Ture Malmgren, Swedish journalist and politician (b. 1851) 1924 – Joseph Conrad, Polish-born British novelist (b. 1857) 1925 – William Bruce, Australian cricketer (b. 1864) 1929 – Emile Berliner, German-American inventor and businessman, invented the phonograph (b. 1851) 1929 – Thorstein Veblen, American economist and sociologist (b. 1857) 1936 – Konstantin Konik, Estonian surgeon and politician, 19th Estonian Minister of Education (b. 1873) 1942 – Richard Willstätter, German-Swiss chemist and academic, Nobel Prize laureate (b. 1872) 1943 – Frumka Płotnicka, Polish resistance fighter during World War II (b. 1914) 1949 – Ignotus, Hungarian poet and author (b. 1869) 1954 – Colette, French novelist and journalist (b. 1873) 1958 – Peter Collins, English race car driver (b. 1931) 1959 – Herb Byrne, Australian footballer (b. 1887) 1961 – Hilda Rix Nicholas, Australian artist (b. 1884) 1964 – Flannery O'Connor, American short story writer and novelist (b. 1925) 1966 – Lenny Bruce, American comedian, actor, and screenwriter (b. 1925) 1968 – Konstantin Rokossovsky, Marshal of the Soviet Union during World War II (b. 1896) 1969 – Alexander Mair, Australian politician, 26th Premier of New South Wales (b. 1889) 1972 – Giannis Papaioannou, Turkish-Greek composer (b. 1913) 1973 – Richard Marshall, American general (b. 1895) 1974 – Edgar Johan Kuusik, Estonian architect and interior designer (b. 1888) 1975 – Andreas Embirikos, Greek poet and photographer (b. 1901) 1977 –

of 128 bits, and a key size of 128, 192, or 256 bits. By contrast, Rijndael per se is specified with block and key sizes that may be any multiple of 32 bits, with a minimum of 128 and a maximum of 256 bits. AES operates on a 4 × 4 column-major order array of bytes, termed the state. Most AES calculations are done in a particular finite field. For instance, 16 bytes, are represented as this two-dimensional array: The key size used for an AES cipher specifies the number of transformation rounds that convert the input, called the plaintext, into the final output, called the ciphertext. The number of rounds are as follows: 10 rounds for 128-bit keys. 12 rounds for 192-bit keys. 14 rounds for 256-bit keys. Each round consists of several processing steps, including one that depends on the encryption key itself. A set of reverse rounds are applied to transform ciphertext back into the original plaintext using the same encryption key. High-level description of the algorithm round keys are derived from the cipher key using the AES key schedule. AES requires a separate 128-bit round key block for each round plus one more. Initial round key addition: each byte of the state is combined with a byte of the round key using bitwise xor. 9, 11 or 13 rounds: a non-linear substitution step where each byte is replaced with another according to a lookup table. a transposition step where the last three rows of the state are shifted cyclically a certain number of steps. a linear mixing operation which operates on the columns of the state, combining the four bytes in each column. Final round (making 10, 12 or 14 rounds in total): The step In the step, each byte in the state array is replaced with a using an 8-bit substitution box. Note that before round 0, the state array is simply the plaintext/input. This operation provides the non-linearity in the cipher. The S-box used is derived from the multiplicative inverse over , known to have good non-linearity properties. To avoid attacks based on simple algebraic properties, the S-box is constructed by combining the inverse function with an invertible affine transformation. The S-box is also chosen to avoid any fixed points (and so is a derangement), i.e., , and also any opposite fixed points, i.e., . While performing the decryption, the step (the inverse of ) is used, which requires first taking the inverse of the affine transformation and then finding the multiplicative inverse. The step The step operates on the rows of the state; it cyclically shifts the bytes in each row by a certain offset. For AES, the first row is left unchanged. Each byte of the second row is shifted one to the left. Similarly, the third and fourth rows are shifted by offsets of two and three respectively. In this way, each column of the output state of the step is composed of bytes from each column of the input state. The importance of this step is to avoid the columns being encrypted independently, in which case AES would degenerate into four independent block ciphers. The step In the step, the four bytes of each column of the state are combined using an invertible linear transformation. The function takes four bytes as input and outputs four bytes, where each input byte affects all four output bytes. Together with , provides diffusion in the cipher. During this operation, each column is transformed using a fixed matrix (matrix left-multiplied by column gives new value of column in the state): Matrix multiplication is composed of multiplication and addition of the entries. Entries are bytes treated as coefficients of polynomial of order . Addition is simply XOR. Multiplication is modulo irreducible polynomial . If processed bit by bit, then, after shifting, a conditional XOR with 1B16 should be performed if the shifted value is larger than FF16 (overflow must be corrected by subtraction of generating polynomial). These are special cases of the usual multiplication in . In more general sense, each column is treated as a polynomial over and is then multiplied modulo with a fixed polynomial . The coefficients are displayed in their hexadecimal equivalent of the binary representation of bit polynomials from . The step can also be viewed as a multiplication by the shown particular MDS matrix in the finite field . This process is described further in the article Rijndael MixColumns. The step In the step, the subkey is combined with the state. For each round, a subkey is derived from the main key using Rijndael's key schedule; each subkey is the same size as the state. The subkey is added by combining each byte of the state with the corresponding byte of the subkey using bitwise XOR. Optimization of the cipher On systems with 32-bit or larger words, it is possible to speed up execution of this cipher by combining the and steps with the step by transforming them into a sequence of table lookups. This requires four 256-entry 32-bit tables (together occupying 4096 bytes). A round can then be performed with 16 table lookup operations and 12 32-bit exclusive-or operations, followed by four 32-bit exclusive-or operations in the step. Alternatively, the table lookup operation can be performed with a single 256-entry 32-bit table (occupying 1024 bytes) followed by circular rotation operations. Using a byte-oriented approach, it is possible to combine the , , and steps into a single round operation. Security The National Security Agency (NSA) reviewed all the AES finalists, including Rijndael, and stated that all of them were secure enough for U.S. Government non-classified data. In June 2003, the U.S. Government announced that AES could be used to protect classified information: The design and strength of all key lengths of the AES algorithm (i.e., 128, 192 and 256) are sufficient to protect classified information up to the SECRET level. TOP SECRET information will require use of either the 192 or 256 key lengths. The implementation of AES in products intended to protect national security systems and/or information must be reviewed and certified by NSA prior to their acquisition and use. AES has 10 rounds for 128-bit keys, 12 rounds for 192-bit keys, and 14 rounds for 256-bit keys. By 2006, the best known attacks were on 7 rounds for 128-bit keys, 8 rounds for 192-bit keys, and 9 rounds for 256-bit keys. Known attacks For cryptographers, a cryptographic "break" is anything faster than a brute-force attack – i.e., performing one trial decryption for each possible key in sequence (see Cryptanalysis). A break can thus include results that are infeasible with current technology. Despite being impractical, theoretical breaks can sometimes provide insight into vulnerability patterns. The largest successful publicly known brute-force attack against a widely implemented block-cipher encryption algorithm was against a 64-bit RC5 key by distributed.net in 2006. The key space increases by a factor of 2 for each additional bit of key length, and if every possible value of the key is equiprobable, this translates into a doubling of the average brute-force key search time. This implies that the effort of a brute-force search increases exponentially with key length. Key length in itself does not imply security against attacks, since there are ciphers with very long keys that have been found to be vulnerable. AES has a fairly simple algebraic framework. In 2002, a theoretical attack, named the "XSL attack", was announced by Nicolas Courtois and Josef Pieprzyk, purporting to show a weakness in the AES algorithm, partially due to the low complexity of its nonlinear components. Since then, other papers have shown that the attack, as originally presented, is unworkable; see XSL attack on block ciphers. During the AES selection process, developers of competing algorithms wrote of Rijndael's algorithm "we are concerned about [its] use ... in security-critical applications." In October 2000, however, at the end of the AES selection process, Bruce Schneier, a developer of the competing algorithm Twofish, wrote that while he thought successful academic attacks on Rijndael would be developed someday, he "did not believe that anyone will ever discover an attack that will allow someone to read Rijndael traffic." Until May 2009, the only successful published attacks against the full AES were side-channel attacks on some specific implementations. In

announcement followed a five-year standardization process in which fifteen competing designs were presented and evaluated, before the Rijndael cipher was selected as the most suitable (see Advanced Encryption Standard process for more details). AES is included in the ISO/IEC 18033-3 standard. AES became effective as a U.S. federal government standard on May 26, 2002, after approval by the U.S. Secretary of Commerce. AES is available in many different encryption packages, and is the first (and only) publicly accessible cipher approved by the U.S. National Security Agency (NSA) for top secret information when used in an NSA approved cryptographic module (see Security of AES, below). Definitive standards The Advanced Encryption Standard (AES) is defined in each of: FIPS PUB 197: Advanced Encryption Standard (AES) ISO/IEC 18033-3: Block ciphers Description of the ciphers AES is based on a design principle known as a substitution–permutation network, and is efficient in both software and hardware. Unlike its predecessor DES, AES does not use a Feistel network. AES is a variant of Rijndael, with a fixed block size of 128 bits, and a key size of 128, 192, or 256 bits. By contrast, Rijndael per se is specified with block and key sizes that may be any multiple of 32 bits, with a minimum of 128 and a maximum of 256 bits. AES operates on a 4 × 4 column-major order array of bytes, termed the state. Most AES calculations are done in a particular finite field. For instance, 16 bytes, are represented as this two-dimensional array: The key size used for an AES cipher specifies the number of transformation rounds that convert the input, called the plaintext, into the final output, called the ciphertext. The number of rounds are as follows: 10 rounds for 128-bit keys. 12 rounds for 192-bit keys. 14 rounds for 256-bit keys. Each round consists of several processing steps, including one that depends on the encryption key itself. A set of reverse rounds are applied to transform ciphertext back into the original plaintext using the same encryption key. High-level description of the algorithm round keys are derived from the cipher key using the AES key schedule. AES requires a separate 128-bit round key block for each round plus one more. Initial round key addition: each byte of the state is combined with a byte of the round key using bitwise xor. 9, 11 or 13 rounds: a non-linear substitution step where each byte is replaced with another according to a lookup table. a transposition step where the last three rows of the state are shifted cyclically a certain number of steps. a linear mixing operation which operates on the columns of the state, combining the four bytes in each column. Final round (making 10, 12 or 14 rounds in total): The step In the step, each byte in the state array is replaced with a using an 8-bit substitution box. Note that before round 0, the state array is simply the plaintext/input. This operation provides the non-linearity in the cipher. The S-box used is derived from the multiplicative inverse over , known to have good non-linearity properties. To avoid attacks based on simple algebraic properties, the S-box is constructed by combining the inverse function with an invertible affine transformation. The S-box is also chosen to avoid any fixed points (and so is a derangement), i.e., , and also any opposite fixed points, i.e., . While performing the decryption, the step (the inverse of ) is used, which requires first taking the inverse of the affine transformation and then finding the multiplicative inverse. The step The step operates on the rows of the state; it cyclically shifts the bytes in each row by a certain offset. For AES, the first row is left unchanged. Each byte of the second row is shifted one to the left. Similarly, the third and fourth rows are shifted by offsets of two and three respectively. In this way, each column of the output state of the step is composed of bytes from each column of the input state. The importance of this step is to avoid the columns being encrypted independently, in which case AES would degenerate into four independent block ciphers. The step In the step, the four bytes of each column of the state are combined using an invertible linear transformation. The function takes four bytes as input and outputs four bytes, where each input byte affects all four output bytes. Together with , provides diffusion in the cipher. During this operation, each column is transformed using a fixed matrix (matrix left-multiplied by column gives new value of column in the state): Matrix multiplication is composed of multiplication and addition of the entries. Entries are bytes treated as coefficients of polynomial of order . Addition is simply XOR. Multiplication is modulo irreducible polynomial . If processed bit by bit, then, after shifting, a conditional XOR with 1B16 should be performed if the shifted value is larger than FF16 (overflow must be corrected by subtraction of generating polynomial). These are special cases of the usual multiplication in . In more general sense, each column is treated as a polynomial over and is then multiplied modulo with a fixed polynomial . The coefficients are displayed in their hexadecimal equivalent of the binary representation of bit polynomials from . The step can also be viewed as a multiplication by the shown particular MDS matrix in the finite field . This process is described further in the article Rijndael MixColumns. The step In the step, the subkey is combined with the state. For each round, a subkey is derived from the main key using Rijndael's key schedule; each subkey is the same size as the state. The subkey is added by combining each byte of the state with the corresponding byte of the subkey using bitwise XOR. Optimization of the cipher On systems with 32-bit or larger words, it is possible to speed up execution of this cipher by combining the and steps with the step by transforming them into a sequence of table lookups. This requires four 256-entry 32-bit tables (together occupying 4096 bytes). A round can then be performed with 16 table lookup operations and 12 32-bit exclusive-or operations, followed by four 32-bit exclusive-or operations in the step. Alternatively, the table lookup operation can be performed with a single 256-entry 32-bit table (occupying 1024 bytes) followed by circular rotation operations. Using a byte-oriented approach, it is possible to combine the , , and steps into a single round operation. Security The National Security Agency (NSA) reviewed all the AES finalists, including Rijndael, and stated that all of them were secure enough for U.S. Government non-classified data. In June 2003, the U.S. Government announced that AES could be used to protect classified information: The design and strength of all key lengths of the AES algorithm (i.e., 128, 192 and 256) are sufficient to protect classified information up to the SECRET level. TOP SECRET information will require use of either the 192 or 256 key lengths. The implementation of AES in products intended to protect national security systems and/or information must be reviewed and certified by NSA prior to their acquisition and use. AES has 10 rounds for 128-bit keys, 12 rounds for 192-bit keys, and 14 rounds for 256-bit keys. By 2006, the best known attacks were on 7 rounds for 128-bit keys, 8 rounds for 192-bit keys, and 9 rounds for 256-bit keys. Known attacks For cryptographers, a cryptographic "break" is anything faster than a brute-force attack – i.e., performing one trial decryption for each possible key in sequence (see Cryptanalysis). A break can thus include results that are infeasible with current technology. Despite being impractical, theoretical breaks can sometimes provide insight into vulnerability patterns. The largest successful publicly known brute-force attack against a widely implemented block-cipher encryption algorithm was against a 64-bit RC5 key by distributed.net in 2006. The key space increases by a factor of 2 for each additional bit of key length, and if every possible value of the key is equiprobable, this translates into a doubling of the average brute-force key search time. This implies that the effort of a brute-force search increases exponentially with key length. Key length in itself does not imply security against attacks, since there are ciphers with very long keys that have been found to be vulnerable. AES has a fairly simple algebraic framework. In 2002, a theoretical attack, named the "XSL attack", was announced by Nicolas Courtois and Josef Pieprzyk, purporting to show a weakness in the AES algorithm, partially due to the low complexity of its nonlinear components. Since then, other papers have shown that the attack, as originally presented, is unworkable; see XSL attack on block ciphers. During the AES selection process, developers of competing algorithms wrote of Rijndael's algorithm "we are concerned about [its] use ... in security-critical applications." In October 2000, however, at the end of the AES selection process, Bruce Schneier, a developer of the competing algorithm Twofish, wrote that while he thought successful academic attacks on Rijndael would be developed someday,

Cafesjian, American businessman and philanthropist (d. 2013) 1925 – Michele Ferrero, Italian entrepreneur (d. 2015) 1925 – Frank Hahn, British economist (d. 2013) 1926 – Michael Mathias Prechtl, German soldier and illustrator (d. 2003) 1927 – Jack Douglas, English actor (d. 2008) 1927 – Anne McLaren, British scientist (d. 2007) 1927 – Harry Gallatin, American basketball player and coach (d. 2015) 1927 – Granny Hamner, American baseball player (d. 1993) 1929 – Richard Mitchell, American author and educator (d. 2002) 1930 – Roger Moens, Belgian runner and sportscaster 1931 – Paul Almond, Canadian director, producer, and screenwriter (d. 2015) 1931 – Bernie Brillstein, American talent agent and producer (d. 2008) 1931 – John Cain Jr., Australian politician, 41st Premier of Victoria (d. 2019) 1932 – Israr Ahmed, Indian-Pakistani theologian, philosopher, and scholar (d. 2010) 1932 – Shirley Cawley, English long jumper 1932 – Frank D'Rone, American singer and guitarist (d. 2013) 1932 – Francis Lai, French accordion player and composer (d. 2018) 1932 – Michael Smith, English-Canadian biochemist and geneticist, Nobel Prize laureate (d. 2000) 1933 – Carol Burnett, American actress, singer, and producer 1933 – Filiberto Ojeda Ríos, Puerto Rican-American general (d. 2005) 1933 – Arno Allan Penzias, German-American physicist and academic, Nobel Prize laureate 1937 – Jean-Pierre Beltoise, French racing driver and motorcycle racer (d. 2015) 1938 – Duane Eddy, American singer-songwriter, guitarist, and actor 1938 – Maurice Williams, American doo-wop/R&B singer-songwriter 1940 – Molvi Iftikhar Hussain Ansari, Indian cleric and politician (d. 2014) 1940 – Giorgio Moroder, Italian singer-songwriter and producer 1940 – Cliff Watson, English rugby league player (d. 2018) 1941 – Claudine Auger, French model and actress (d. 2019) 1942 – Svyatoslav Belza, Russian journalist, author, and critic (d. 2014) 1942 – Sharon Carstairs, Canadian lawyer and politician, Leader of the Government in the Senate 1942 – Michael Kergin, Canadian diplomat, Canadian Ambassador to the United States 1942 – Bobby Rydell, American singer and actor 1942 – Jadwiga Staniszkis, Polish sociologist, political scientist, and academic 1943 – Gary Wright, American singer-songwriter, keyboard player, and producer 1943 – Peter Zumthor, Swiss architect and academic, designed the Therme Vals 1944 – Richard Bradshaw, English conductor (d. 2007) 1945 – Howard Davies, English director and producer (d. 2016) 1945 – Dick Johnson, Australian racing driver 1945 – Sylvain Simard, Canadian academic and politician 1946 – Ralph Coates, English international footballer (d. 2010) 1946 – Marilyn Nelson, American poet and author 1946 – Alberto Quintano, Chilean footballer 1949 – Carlos Bianchi, Argentinian footballer and manager 1949 – Jerry Blackwell, American wrestler (d. 1995) 1951 – John Battle, English politician 1954 – Tatyana Fomina, Estonian chess player 1954 – Alan Hinkes, English mountaineer and explorer 1955 – Kurt Bodewig, German politician 1956 – Koo Stark, American actress and photographer 1958 – John Crichton-Stuart, 7th Marquess of Bute, Scottish racing driver (d. 2021) 1958 – Giancarlo Esposito, American actor, director, and producer 1958 – Georgios Kostikos, Greek footballer, coach, and manager 1959 – John Corabi, American singer-songwriter and guitarist 1960 – Steve Lombardozzi, American baseball player and coach 1960 – Roger Taylor, English drummer 1961 – Joan Chen, Chinese-American actress, director, producer, and screenwriter 1961 – Chris Mars, American artist 1962 – Colin Anderson, English footballer 1962 – Debra Wilson, American actress and comedian 1963 – Jet Li, Chinese-Singaporean martial artist, actor, and producer 1963 – Colin Scotts, Australian-American football player 1963 – Cornelia Ullrich, German hurdler 1963 – Bill Wennington, Canadian basketball player 1965 – Susannah Harker, English actress 1965 – Kevin James, American actor and comedian 1967 – Glenn Thomas Jacobs, American professional wrestler, actor, businessman and politician 1967 – Marianne Jean-Baptiste, English actress and singer-songwriter 1967 – Toomas Tõniste, Estonian sailor and politician 1970 – Dean Austin, English footballer and manager 1970 – Melania Trump, Slovene-American model; 47th First Lady of the United States 1970 – Kristen R. 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Naudet, French-American director and producer 1973 – Chris Perry, English footballer 1973 – Óscar, Spanish footballer and coach 1975 – Joey Jordison, American musician and songwriter (d. 2021) 1975 – Rahul Verma, Indian social worker and activist 1976 – Luigi Panarelli, Italian footballer 1976 – Václav Varaďa, Czech ice hockey player 1977 – Samantha Cristoforetti, Italian astronaut 1977 – Kosuke Fukudome, Japanese baseball player 1977 – Roxana Saberi, American journalist and author 1977 – Tom Welling, American actor 1978 – Stana Katic, Canadian actress 1978 – Peter Madsen, Danish footballer 1980 – Jordana Brewster, Panamanian-American actress 1980 – Marlon King, English footballer 1980 – Anna Mucha, Polish actress and journalist 1980 – Channing Tatum, American actor and producer 1981 – Caro Emerald, Dutch pop and jazz singer 1981 – Ms. Dynamite, English rapper and producer 1981 – Sandra Schmitt, German skier (d. 2000) 1982 – Novlene Williams-Mills, Jamaican sprinter 1983 – José María López, Argentinian racing driver 1983 – Jessica Lynch, American soldier 1985 – John Isner, American tennis player 1985 – Andrea Koch Benvenuto, Chilean tennis player 1986 – Lior Refaelov, Israeli footballer 1986 – Yuliya Zaripova, Russian runner 1987 – Jorge Andújar Moreno, Spanish footballer 1988 – Ben Spina, Australian rugby league player 1988 – Manuel Viniegra, Mexican footballer 1988 – Gareth Evans, English footballer 1989 – Melvin Ingram, American football player 1990 – Mitch Rein, Australian rugby league player 1990 – Nevin Spence, Northern Irish rugby player (d. 2012) 1991 – Lazaros Fotias, Greek footballer 1991 – Peter Handscomb, Australian cricketer 1991 – Isaac Liu, New Zealand rugby league player 1991 – Ignacio Lores Varela, Uruguayan footballer 1991 – Srdjan Pejicic, Canadian/Bosnian basketball player 1991 – Wojciech Pszczolarski, Polish bicycle racer 1992 – Aaron Judge, American baseball player 1994 – Daniil Kvyat, Russian racing driver 2002 – Meagan Best, Barbadian squash player Deaths Pre-1600 499 – Emperor Xiaowen of Northern Wei (b. 467) 645 – Richarius, Frankish monk and saint (b. 560) 680 – Muawiyah I, Umayyad caliph (b. 602) 757 – Pope Stephen II (b. 715) 893 – Chen Jingxuan, general of the Tang Dynasty 962 – Adalbero I, bishop of Metz 1192 – Emperor Go-Shirakawa of Japan (b. 1127) 1366 – Simon Islip, Archbishop of Canterbury 1392 – Jeong Mong-ju, Korean civil minister, diplomat and scholar (b. 1338) 1444 – Robert Campin, Flemish painter (b. 1378) 1478 – Giuliano de' Medici, Italian ruler (b. 1453) 1489 – Ashikaga Yoshihisa, Japanese shōgun (b. 1465) 1558 – Jean Fernel, French physician (b. 1497) 1601–1900 1686 – Magnus Gabriel De la Gardie, Swedish statesman and military man (b. 1622) 1716 – John Somers, 1st Baron Somers, English jurist and politician, Lord High Chancellor of Great Britain (b. 1651) 1784 – Nano Nagle, Irish nun and educator, founded the Presentation Sisters (b. 1718) 1789 – Petr Ivanovich Panin, Russian general (b. 1721) 1809 – Bernhard Schott, German music publisher (b. 1748) 1865 – John Wilkes Booth, American actor, assassin of Abraham Lincoln (b. 1838) 1881 – Ludwig Freiherr von und zu der Tann-Rathsamhausen, German general (b. 1815) 1895 – Eric Stenbock, Estonian-English author and poet (b. 1860) 1901–present 1910 – Bjørnstjerne Bjørnson, Norwegian-French author, poet, and playwright, Nobel Prize laureate (b. 1832) 1915 – John Bunny, American actor (b. 1863) 1920 – Srinivasa Ramanujan, Indian mathematician and theorist (b. 1887) 1932 – William Lockwood, English cricketer (b. 1868) 1934 – Arturs Alberings, Latvian politician, former Prime Minister of Latvia (b. 1876) 1940 – Carl Bosch, German chemist and engineer, Nobel Prize laureate (b. 1874) 1944 – Violette Morris, French footballer, shot putter, and discus thrower (b. 1893) 1945 – Sigmund Rascher, German physician (b. 1909) 1945 – Pavlo Skoropadskyi, German-Ukrainian general and politician, Hetman of Ukraine (b. 1871) 1946 – James Larkin White, American miner, explorer, and park ranger (b. 1882) 1950 – George Murray Hulbert, American lawyer, judge, and politician (b. 1881) 1951 – Arnold Sommerfeld, German physicist and academic (b. 1868) 1956 – Edward Arnold, American actor (b. 1890) 1957 – Gichin Funakoshi, Japanese martial artist, founded Shotokan (b. 1868) 1964 – E. J. 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exhibit electrical anisotropy; electrical conductivity in one direction (e.g. parallel to a layer), is different from that in another (e.g. perpendicular to a layer). This property is used in the gas and oil exploration industry to identify hydrocarbon-bearing sands in sequences of sand and shale. Sand-bearing hydrocarbon assets have high resistivity (low conductivity), whereas shales have lower resistivity. Formation evaluation instruments measure this conductivity/resistivity and the results are used to help find oil and gas in wells. The mechanical anisotropy measured for some of the sedimentary rocks like coal and shale can change with corresponding changes in their surface properties like sorption when gases are produced from the coal and shale reservoirs. The hydraulic conductivity of aquifers is often anisotropic for the same reason. When calculating groundwater flow to drains or to wells, the difference between horizontal and vertical permeability must be taken into account, otherwise the results may be subject to error. Most common rock-forming minerals are anisotropic, including quartz and feldspar. Anisotropy in minerals is most reliably seen in their optical properties. An example of an isotropic mineral is garnet. Medical acoustics Anisotropy is also a well-known property in medical ultrasound imaging describing a different resulting echogenicity of soft tissues, such as tendons, when the angle of the transducer is changed. Tendon fibers appear hyperechoic (bright) when the transducer is perpendicular to the tendon, but can appear hypoechoic (darker) when the transducer is angled obliquely. This can be a source of interpretation error for inexperienced practitioners. Materials science and engineering Anisotropy, in materials science, is a material's directional dependence of a physical property. This is a critical consideration for materials selection in engineering applications. A material with physical properties that are symmetric about an axis that is normal to a plane of isotropy is called a transversely isotropic material. Tensor descriptions of material properties can be used to determine the directional dependence of that property. For a monocrystalline material, anisotropy is associated with the crystal symmetry in the sense that more symmetric crystal types have fewer independent coefficients in the tensor description of a given property. When a material is polycrystalline, the directional dependence on properties is often related to the processing techniques it has undergone. A material with randomly oriented grains will be isotropic, whereas materials with texture will be often be anisotropic. Textured materials are often the result of processing techniques like hot rolling, wire-drawing, and heat treatment. Mechanical properties of materials such as Young's modulus, ductility, yield strength, and high temperature creep rate, are often dependent on the direction of measurement. Fourth rank tensor properties, like the elastic constants, are anisotropic, even for materials with cubic symmetry. The Young's modulus relates stress and strain when an isotropic material is elastically deformed; to describe elasticity in an anisotropic material, stiffness (or compliance) tensors are used instead. In metals, anisotropic elasticity behavior is present in all single crystals with three independent coefficients for cubic crystals, for example. For face centered cubic materials such as Nickel and Copper, the stiffness is highest along the <111> direction, normal to the close packed planes, and smallest parallel to <100>. Tungsten is so nearly isotropic at room temperature that it can be considered to have only two stiffness coefficients; Aluminum is another metal that is nearly isotropic. For an isotropic material, , where is the shear modulus, is the Young's modulus, and is the material's Poisson's ratio. Therefore, for cubic materials, we can think of anisotropy, , as the ratio between the empirically determined shear modulus for the cubic material and its (isotropic) equivalent: The latter expression is known as the Zener ratio, , where refers to Elastic constants in Voigt (vector-matrix) notation. For an isotropic material, the ratio is one. Fiber-reinforced or layered composite materials exhibit anisotropic mechanical properties, due to orientation of the reinforcement material. In many fiber-reinforced composites like carbon fiber or glass fiber based composites, the weave of the material (e.g. unidirectional or plain weave) can determine the extent of the anisotropy of the bulk material. The tunability of orientation of the fibers, allows for application-based designs of composite materials, depending on the direction of stresses applied onto the material. Amorphous materials such as glass and polymers are typically isotropic. Due to the highly randomized orientation of macromolecules in polymeric materials, polymers are in general described as isotropic. However, polymers can be engineered to have directionally dependent properties through processing techniques or introduction of anisotropy-inducing elements. Researchers have built composite materials with aligned fibers and voids to generate anisotropic hydrogels, in order to mimic hierarchically ordered biological soft matter. 3D printing, especially Fused Deposition Modeling, can introduce anisotropy into printed parts. This is due to the fact that FDM is designed to extrude and print layers of thermoplastic materials. This creates materials that are strong when tensile stress is applied in parallel to the layers and weak when the material is perpendicular to the layers. Microfabrication Anisotropic etching techniques (such as deep reactive ion etching) are used in microfabrication processes to create well defined microscopic features with a high aspect ratio. These features are commonly used in MEMS and microfluidic devices, where the anisotropy of the

which isotropy is broken (or an axis of symmetry, such as normal to crystalline layers). Some materials can have multiple such optical axes. Geophysics and geology Seismic anisotropy is the variation of seismic wavespeed with direction. Seismic anisotropy is an indicator of long range order in a material, where features smaller than the seismic wavelength (e.g., crystals, cracks, pores, layers or inclusions) have a dominant alignment. This alignment leads to a directional variation of elasticity wavespeed. Measuring the effects of anisotropy in seismic data can provide important information about processes and mineralogy in the Earth; significant seismic anisotropy has been detected in the Earth's crust, mantle and inner core. Geological formations with distinct layers of sedimentary material can exhibit electrical anisotropy; electrical conductivity in one direction (e.g. parallel to a layer), is different from that in another (e.g. perpendicular to a layer). This property is used in the gas and oil exploration industry to identify hydrocarbon-bearing sands in sequences of sand and shale. Sand-bearing hydrocarbon assets have high resistivity (low conductivity), whereas shales have lower resistivity. Formation evaluation instruments measure this conductivity/resistivity and the results are used to help find oil and gas in wells. The mechanical anisotropy measured for some of the sedimentary rocks like coal and shale can change with corresponding changes in their surface properties like sorption when gases are produced from the coal and shale reservoirs. The hydraulic conductivity of aquifers is often anisotropic for the same reason. When calculating groundwater flow to drains or to wells, the difference between horizontal and vertical permeability must be taken into account, otherwise the results may be subject to error. Most common rock-forming minerals are anisotropic, including quartz and feldspar. Anisotropy in minerals is most reliably seen in their optical properties. An example of an isotropic mineral is garnet. Medical acoustics Anisotropy is also a well-known property in medical ultrasound imaging describing a different resulting echogenicity of soft tissues, such as tendons, when the angle of the transducer is changed. Tendon fibers appear hyperechoic (bright) when the transducer is perpendicular to the tendon, but can appear hypoechoic (darker) when the transducer is angled obliquely. This can be a source of interpretation error for inexperienced practitioners. Materials science and engineering Anisotropy, in materials science, is a material's directional dependence of a physical property. This is a critical consideration for materials selection in engineering applications. A material with physical properties that are symmetric about an axis that is normal to a plane of isotropy is called a transversely isotropic material. Tensor descriptions of material properties can be used to determine the directional dependence of that property. For a monocrystalline material, anisotropy is associated with the crystal symmetry in the sense that more symmetric crystal types have fewer independent coefficients in the tensor description of a given property. When a material is polycrystalline, the directional dependence on properties is often related to the processing techniques it has undergone. A material with randomly oriented grains will be isotropic, whereas materials with texture will be often be anisotropic. Textured materials are often the result of processing techniques like hot rolling, wire-drawing, and heat treatment. Mechanical properties of materials such as Young's modulus, ductility, yield strength, and high temperature creep rate, are often dependent on the direction of measurement. Fourth rank tensor properties, like the elastic constants, are

An alpha particle can be thought of as being inside a potential barrier whose walls are 25 MeV above the potential at infinity. However, decay alpha particles only have energies of around 4 to 9 MeV above the potential at infinity, far less than the energy needed to escape. Quantum mechanics, however, allows the alpha particle to escape via quantum tunneling. The quantum tunneling theory of alpha decay, independently developed by George Gamow and Ronald Wilfred Gurney and Edward Condon in 1928, was hailed as a very striking confirmation of quantum theory. Essentially, the alpha particle escapes from the nucleus not by acquiring enough energy to pass over the wall confining it, but by tunneling through the wall. Gurney and Condon made the following observation in their paper on it: It has hitherto been necessary to postulate some special arbitrary 'instability' of the nucleus, but in the following note, it is pointed out that disintegration is a natural consequence of the laws of quantum mechanics without any special hypothesis... Much has been written of the explosive violence with which the α-particle is hurled from its place in the nucleus. But from the process pictured above, one would rather say that the α-particle almost slips away unnoticed. The theory supposes that the alpha particle can be considered an independent particle within a nucleus, that is in constant motion but held within the nucleus by strong interaction. At each collision with the repulsive potential barrier of the electromagnetic force, there is a small non-zero probability that it will tunnel its way out. An alpha particle with a speed of 1.5×107 m/s within a nuclear diameter of approximately 10−14 m will collide with the barrier more than 1021 times per second. However, if the probability of escape at each collision is very small, the half-life of the radioisotope will be very long, since it is the time required for the total probability of escape to reach 50%. As an extreme example, the half-life of the isotope bismuth-209 is . The isotopes in beta-decay stable isobars that are also stable with regards to double beta decay with mass number A = 5, A = 8, 143 ≤ A ≤ 155, 160 ≤ A ≤ 162, and A ≥ 165 are theorized to undergo alpha decay. All other mass numbers (isobars) have exactly one theoretically stable nuclide). Those with mass 5 decay to helium-4 and a proton or a neutron, and those with mass 8 decay to two helium-4 nuclei; their half-lives (helium-5, lithium-5, and beryllium-8) are very short, unlike the half-lives for all other such nuclides with A ≤ 209, which are very long. (Such nuclides with A ≤ 209 are primordial nuclides except 146Sm.) Working out the details of the theory leads to an equation relating the half-life of a radioisotope to the decay energy of its alpha particles, a theoretical derivation of the empirical Geiger–Nuttall law. Uses Americium-241, an alpha emitter, is used in smoke detectors. The alpha particles ionize air in an open ion chamber and a small current flows through the ionized air. Smoke particles from the fire that enter the chamber reduce the current, triggering the smoke detector's alarm. Radium-223 is also an alpha emitter. It is used in the treatment of skeletal metastases (cancers in the bones). Alpha decay can provide a safe power source for radioisotope thermoelectric generators used for space probes and were used for artificial heart pacemakers. Alpha decay is much more easily shielded against than other forms of radioactive decay. Static eliminators typically use polonium-210, an alpha emitter, to ionize the air, allowing the 'static cling' to dissipate more rapidly. Toxicity Highly charged and heavy, alpha particles lose their several MeV of energy within a small volume of material, along with a very short mean free path. This increases the chance of double-strand breaks to the DNA in cases of internal contamination, when ingested, inhaled, injected or introduced through the skin. Otherwise, touching an alpha source is typically not harmful, as alpha particles are

energies of around 4 to 9 MeV above the potential at infinity, far less than the energy needed to escape. Quantum mechanics, however, allows the alpha particle to escape via quantum tunneling. The quantum tunneling theory of alpha decay, independently developed by George Gamow and Ronald Wilfred Gurney and Edward Condon in 1928, was hailed as a very striking confirmation of quantum theory. Essentially, the alpha particle escapes from the nucleus not by acquiring enough energy to pass over the wall confining it, but by tunneling through the wall. Gurney and Condon made the following observation in their paper on it: It has hitherto been necessary to postulate some special arbitrary 'instability' of the nucleus, but in the following note, it is pointed out that disintegration is a natural consequence of the laws of quantum mechanics without any special hypothesis... Much has been written of the explosive violence with which the α-particle is hurled from its place in the nucleus. But from the process pictured above, one would rather say that the α-particle almost slips away unnoticed. The theory supposes that the alpha particle can be considered an independent particle within a nucleus, that is in constant motion but held within the nucleus by strong interaction. At each collision with the repulsive potential barrier of the electromagnetic force, there is a small non-zero probability that it will tunnel its way out. An alpha particle with a speed of 1.5×107 m/s within a nuclear diameter of approximately 10−14 m will collide with the barrier more than 1021 times per second. However, if the probability of escape at each collision is very small, the half-life of the radioisotope will be very long, since it is the time required for the total probability of escape to reach 50%. As an extreme example, the half-life of the isotope bismuth-209 is . The isotopes in beta-decay stable isobars that are also stable with regards to double beta decay with mass number A = 5, A = 8, 143 ≤ A ≤ 155, 160 ≤ A ≤ 162, and A ≥ 165 are theorized to undergo alpha decay. All other mass numbers (isobars) have exactly one theoretically stable nuclide). Those with mass 5 decay to helium-4 and a proton or a neutron, and those with mass 8 decay to two helium-4 nuclei; their half-lives (helium-5, lithium-5, and beryllium-8) are very short, unlike the half-lives for all other such nuclides with A ≤ 209, which are very long. (Such nuclides with A ≤ 209 are primordial nuclides except 146Sm.) Working out the details of the theory leads to an equation relating the half-life of a radioisotope to the decay energy of its alpha particles, a theoretical derivation of the empirical Geiger–Nuttall law. Uses Americium-241, an alpha emitter, is used in smoke detectors. The alpha particles ionize air in an open ion chamber and a small current flows through the ionized air. Smoke particles from the fire that enter the chamber reduce the current, triggering the smoke detector's alarm. Radium-223 is also an alpha emitter. It is used in the treatment of skeletal metastases (cancers in the bones). Alpha decay can provide a safe power source for radioisotope thermoelectric generators used for space probes and were used for artificial heart pacemakers. Alpha decay is much more easily shielded against than other forms of radioactive decay. Static eliminators typically use polonium-210, an alpha emitter, to ionize the air, allowing the 'static cling' to dissipate more rapidly. Toxicity Highly charged and heavy, alpha particles lose their several MeV of energy within a small volume of material, along with a very short mean free path. This increases the chance of double-strand breaks to the DNA in cases of internal contamination, when ingested, inhaled, injected or introduced through the skin. Otherwise, touching an alpha source is typically not harmful, as alpha particles are effectively shielded by a few centimeters of air, a piece of paper, or the thin layer of dead skin cells that make up the epidermis; however, many alpha sources are also accompanied by beta-emitting radio daughters, and both are often accompanied by gamma photon emission. Relative biological effectiveness (RBE) quantifies the ability of radiation to cause certain biological effects, notably either cancer or cell-death, for equivalent radiation exposure. Alpha radiation has a high linear energy transfer (LET) coefficient, which is about one ionization of a molecule/atom for every angstrom of travel by the alpha particle. The RBE has been set at the value of 20 for alpha radiation by various government regulations. The RBE is set at 10 for neutron irradiation, and at 1 for beta radiation and ionizing photons. However, the recoil of the parent nucleus (alpha recoil) gives it a significant amount of energy, which also causes ionization damage (see ionizing radiation). This energy is roughly the weight of the alpha (4 u) divided by the weight of the parent (typically about 200 u) times the total energy of the alpha. By some estimates, this might account for most of the internal radiation damage, as the recoil nucleus is part of an atom that is much larger than an alpha particle, and causes a very dense trail of ionization; the atom is typically a heavy metal, which preferentially collect on the chromosomes. In some studies, this has resulted in an RBE approaching 1,000 instead of the value used in governmental regulations. The largest natural contributor to public radiation dose is radon, a naturally occurring, radioactive gas found in soil and rock. If the gas is inhaled, some of the radon particles may attach to the inner lining of the lung. These particles continue to decay, emitting alpha particles, which can damage cells in the lung tissue. The death of Marie Curie at age 66 from aplastic anemia was probably caused by prolonged exposure to high doses of ionizing radiation, but

to commit itself to in the future. First, to end extreme poverty by 2030, an objective that echoes the sentiments of the UN and the Obama administration. Additionally, the WBG set an interim target of reducing extreme poverty to below 9% by 2020. Second, to focus on growth among the bottom 40% of people, as opposed to standard GDP growth. This commitment ensures that the growth of the developing world lifts people out of poverty, rather than exacerbating inequality. As the World Bank's primary focus is on delivering economic growth to enable equitable prosperity, its developments programs are primarily commercial-based in nature, as opposed to the UN. Since the World Bank recognizes better jobs will result in higher income, and thus less poverty, the WBG seeks to support employment training initiatives, small business development programs and strong labor protection laws. However, since much of the growth in the developing world has been inequitable, the World Bank has also begun teaming with client states to map out trends in inequality and to propose public policy changes that can level the playing field. Moreover, the World Bank engages in a variety of nutritional, transfer payments and transport-based initiatives. Children who experience under-nutrition from conception to two years of age have a much higher risk of physical and mental disability. Thus, they are often trapped in poverty and are unable to make a full contribution to the social and economic development of their communities as adults. The WBG estimates that as much as 3% of GDP can be lost as a result of under-nutrition among the poorest nations. To combat undernutrition, the WBG has partnered with UNICEF and the WHO to ensure all small children are fully fed. The WBG also offers conditional cash transfers to poor households who meet certain requirements such as maintaining children's healthcare or ensuring school attendance. Finally, the WBG understands investment in public transportation and better roads is key to breaking rural isolation, improving access to healthcare and providing better job opportunities for the World's poor. United Nations The UN Office for the Coordination of Humanitarian Affairs (OCHA) works to synchronize the disparate international, national and non-governmental efforts to contest poverty. OCHA seeks to prevent "confusion" in relief operations and to ensure that the humanitarian response to disaster situations has greater accountability and predictability. To do so, OCHA has begun deploying Humanitarian Coordinators and Country Teams to provide a solid architecture for the international community to work through. The United Nation's Children's Fund (UNICEF) was created by the UN to provide food, clothing and healthcare to European children facing famine and disease in the immediate aftermath of World War II. After the UN General Assembly extended UNICEF's mandate indefinitely in 1953, it actively worked to help children in extreme poverty in more than 190 countries and territories to overcome the obstacles that poverty, violence, disease and discrimination place in a child's path. Its current focus areas are 1) Child survival & development 2) Basic education & gender equality 3) Children and HIV/AIDS and 4) Child protection. The UN Refugee Agency (UNHCR) is mandated to lead and coordinate international action to protect refugees worldwide. Its primary purpose is to safeguard the rights of refugees by ensuring anyone can exercise the right to seek asylum in another state, with the option to return home voluntarily, integrate locally or resettle in a third country. The UNHCR operates in over 125 countries, helping approximately 33.9 million persons. The World Food Programme (WFP) is the largest agency dedicated to fighting hunger worldwide. On average, the WFP brings food assistance to more than 90 million people in 75 countries. The WFP not only strives to prevent hunger in the present, but also in the future by developing stronger communities which will make food even more secure on their own. The WFP has a range of expertise from Food Security Analysis, Nutrition, Food Procurement and Logistics. The World Health Organization (WHO) is responsible for providing leadership on global health matters, shaping the health research agenda, articulating evidence-based policy decisions and combating diseases that are induced from poverty, such as HIV/AIDS, malaria and tuberculosis. Moreover, the WHO deals with pressing issues ranging from managing water safety, to dealing with maternal and newborn health. Bilateral organizations USAID The US Agency for International Development (USAID) is the lead US government agency dedicated to ending extreme poverty. Currently the largest bilateral donor in the world, the United States channels the majority of its development assistance through USAID and the US Department of State. In President Obama's 2013 State of the Union address, he declared, "So the United States will join with our allies to eradicate such extreme poverty in the next two decades ... which is within our reach." In response to Obama's call to action, USAID has made ending extreme poverty central to its mission statement. Under its New Model of Development, USAID seeks to eradicate extreme poverty through the use of innovation in science and technology, by putting a greater emphasis on evidence based decision-making, and through leveraging the ingenuity of the private sector and global citizens. A major initiative of the Obama Administration is Power Africa, which aims to bring energy to 20 million people in Sub-Saharan Africa. By reaching out to its international partners, whether commercial or public, the US has leveraged over $14 billion in outside commitments after investing only US$7 billion of its own. To ensure that Power Africa reaches the region's poorest, the initiative engages in a transaction based approach to create systematic change. This includes expanding access to electricity to more than 20,000 additional households which already live without power. In terms of specific programming, USAID works in a variety of fields from preventing hunger, reducing HIV/AIDS, providing general health assistance and democracy assistance, as well as dealing with gender issues. To deal with food security, which affects roughly 842 million people (who go to bed hungry each night), USAID coordinates the Feed the Future Initiative (FtF). FtF aims to reduce poverty and undernutrition each by 20% over five years. Because of the President's Emergency Plan for AIDS Relief (PEPFAR) and a variety of congruent actors, the incidence of AIDS and HIV, which used to ravage Africa, reduced in scope and intensity. Through PEPFAR, the United States has ensured over five million people have received life-saving antiviral drugs, a significant proportion of the eight million people receiving treatment in relatively poor nations. In terms of general health assistance, USAID has worked to reduce maternal mortality by 30%, under-five child mortality by 35%, and has accomplished a host of other goals. USAID also supports the gamut of democratic initiatives, from promoting human rights and accountable, fair governance, to supporting free and fair elections and the rule of law. In pursuit of these goals, USAID has increased global political participation bFy training more than 9,800 domestic election observers and providing civic education to more than 6.5 million people. Since 2012, the Agency has begun integrating critical gender perspectives across all aspects of its programming to ensure all USAID initiatives work to eliminate gender disparities. To do so, USAID seeks to increase the capability of women and girls to realize their rights and determine their own life outcomes. Moreover, USAID supports additional programs to improve women's access to capital and markets, builds theirs skills in agriculture, and supports women's desire to own businesses. DfID The Department for International Development (DfID) is the UK's lead agency for eradicating extreme poverty. To do so, DfID focuses on the creation of jobs, empowering women, and rapidly responding to humanitarian emergencies. Some specific examples of DfID projects include governance assistance, educational initiatives, and funding cutting-edge research. In 2014 alone, DfID will help to ensure free and fair elections in 13 countries. DfID will also help provide 10 million women with access to justice through strengthened judicial systems and will help 40 million people make their authorities more accountable. By 2015, DfID will have helped 9 million children attend primary school, at least half of which will be girls. Furthermore, through the Research4Development (R4D) project, DfID has funded over 35,000 projects in the name of creating new technologies to help the world's poorest. These technologies include: vaccines for diseases of African cattle, better diagnostic methods for tuberculosis, new drugs for combating malaria, and developing flood-resistant rice. In addition to technological research, the R4D is also used to fund projects that seek to understand what, specifically, about governance structures can be changed to help the world's poorest. Non-governmental organizations A multitude of non-governmental organizations operate in the field of extreme poverty, actively working to alleviate the poorest of the poor of their deprivation. To name but a few notable organizations: Save the Children, the Overseas Development Institute, Concern Worldwide, ONE, Trickle Up and Oxfam have all done a considerable amount of work in extreme poverty. Save the Children is the leading international organization dedicated to helping the world's indigent children. In 2013, Save the Children reached over 143 million children through their work, including over 52 million children directly. Save the Children also recently released their own report titled "Getting to Zero", in which they argued the international community could feasibly do more than lift the world's poor above $1.25/day. The Overseas Development Institute (ODI) is a UK based think tank on international development and humanitarian issues. ODI is dedicated to alleviating the suffering of the world's poor by providing high-quality research and practical policy advice to the World's development officials. ODI also recently released a paper entitled, "The Chronic Poverty Report 2014–2015: The road to zero extreme poverty", in which its authors assert that though the international communities' goal of ending extreme poverty by 2030 is laudable, much more targeted resources will be necessary to reach said target. The report states that "To eradicate extreme poverty, massive global investment is required in social assistance, education and pro-poorest economic growth". Concern Worldwide is an international humanitarian organization whose mission is to end extreme poverty by influencing decision makers at all levels of government (from local to international). Concern has also produced a report on extreme poverty in which they explain their own conception of extreme poverty from a NGO's standpoint. In this paper, named "How Concern Understands Extreme Poverty", the report's creators write that extreme poverty entails more than just living under $1.25/day, it also includes having a small number of assets and being vulnerable to severe negative shocks (whether natural or man made). ONE, the organization cofounded by Bono, is a non-profit organization funded almost entirely by foundations, individual philanthropists

M0 measure of the Alkire-Foster method reveals that poverty in the region is primarily caused by a lack of access to electricity, lack of access to drinking water, and widespread overcrowding. In contrast, data from the Chhukha District of Bhutan reveals that income is a much larger contributor to poverty as opposed to other dimensions within the region. However, the MPI only presents data from 105 countries, so it cannot be used for global measurements. Share of the population living in extreme poverty Current trends Getting to zero Using the World Bank definition of $1.90/day, , roughly 710 million people remained in extreme poverty (or roughly 1 in 10 people worldwide). Nearly half of them live in India and China, with more than 85% living in just 20 countries. Since the mid-1990s, there has been a steady decline in both the worldwide poverty rate and the total number of extreme poor. In 1990, the percentage of the global population living in extreme poverty was 43%, but in 2011, that percentage had dropped down to 21%. This halving of the extreme poverty rate falls in line with the first Millennium Development Goal (MDG1) proposed by former UN Secretary-General Kofi Annan, who called on the international community at the turn of the century to reduce the percentage of people in extreme poverty by half by 2015. This reduction in extreme poverty took place most notably in China, Indonesia, India, Pakistan and Vietnam. These five countries accounted for the alleviation of 715 million people out of extreme poverty between 1990 and 2010 – more than the global net total of roughly 700 million. This statistical oddity can be explained by the fact that the number of people living in extreme poverty in Sub-Saharan Africa rose from 290 million to 414 million over the same period. However, there have been many positive signs for extensive, global poverty reduction as well. Since 1999, the total number of extreme poor has declined by an average of 50 million per year. Moreover, in 2005, for the first time in recorded history, poverty rates began to fall in every region of the world, including Africa. As aforementioned, the number of people living in extreme poverty has reduced from 1.9 billion to 766 million over the span of the last decades. If we remain on our current trajectory, many economists predict we could reach global zero by 2030–2035, thus ending extreme poverty. Global zero entails a world in which fewer than 3% of the global population lives in extreme poverty (projected under most optimistic scenarios to be fewer than 200 million people). This zero figure is set at 3% in recognition of the fact that some amount of frictional (temporary) poverty will continue to exist, whether it is caused by political conflict or unexpected economic fluctuations, at least for the foreseeable future. However, the Brookings Institution notes that any projection about poverty more than a few years into the future runs the risk of being highly uncertain. This is because changes in consumption and distribution throughout the developing world over the next two decades could result in monumental shifts in global poverty, for better or worse. Others are more pessimistic about this possibility, predicting a range of 193 million to 660 million people still living in extreme poverty by 2035. Additionally, some believe the rate of poverty reduction will slow down in the developing world, especially in Africa, and as such it will take closer to five decades to reach global zero. Despite these reservations, several prominent international and national organizations, including the UN, the World Bank and the United States Federal Government (via USAID), have set a target of reaching global zero by the end of 2030. Exacerbating factors There are a variety of factors that may reinforce or instigate the existence of extreme poverty, such as weak institutions, cycles of violence and a low level of growth. Recent World Bank research shows that some countries can get caught in a "fragility trap", in which self-reinforcing factors prevent the poorest nations from emerging from low-level equilibrium in the long run. Moreover, most of the reduction in extreme poverty over the past twenty years has taken place in countries that have not experienced a civil conflict or have had governing institutions with a strong capacity to actually govern. Thus, to end extreme poverty, it is also important to focus on the interrelated problems of fragility and conflict. USAID defines fragility as a government's lack of both legitimacy (the perception the government is adequate at doing its job) and effectiveness (how good the government is at maintaining law and order, in an equitable manner). As fragile nations are unable to equitably and effectively perform the functions of a state, these countries are much more prone to violent unrest and mass inequality. Additionally, in countries with high levels of inequality (a common problem in countries with inadequate governing institutions), much higher growth rates are needed to reduce the rate of poverty when compared with other nations. Additionally, if China and India are removed from the equation, up to 70% of the world's poor live in fragile states by some definitions of fragility. Some analysts project that extreme poverty will be increasingly concentrated in fragile, low-income states like Haiti, Yemen and the Central African Republic. However, some academics, such as Andy Sumner, say that extreme poverty will be increasingly concentrated in middle-income countries, creating a paradox where the world's poor do not actually live in the poorest countries. To help low-income earners, fragile states make the transition towards peace and prosperity, the New Deal for Engagement in Fragile States, endorsed by roughly forty countries and multilateral institutions, was created in 2011. This represents an important step towards redressing the problem of fragility as it was originally articulated by self-identified fragile states who called on the international community to not only "do things differently", but to also "do different things". Civil conflict also remains a prime cause for the perpetuation of poverty throughout the developing world. Armed conflict can have severe effects on economic growth for many reasons such as the destruction of assets, destruction of livelihoods, creation of unwanted mass migration, and diversion of public resources towards war. Significantly, a country that experienced major violence during 1981–2005 had extreme poverty rates 21 percentage points higher than a country with no violence. On average, each civil conflict will cost a country roughly 30 years of GDP growth. Therefore, a renewed commitment from the international community to address the deteriorating situation in highly fragile states is necessary to both prevent the mass loss of life, but to also prevent the vicious cycle of extreme poverty. Population trends and dynamics (e.g. population growth) can also have a large impact on prospects for poverty reduction. According to the United Nations, "in addition to improving general health and well-being, analysis shows that meeting the reproductive health and contraceptive needs of all women in the developing world more than pays for itself"). In 2013, a prevalent finding in a report by the World Bank was that extreme poverty is most prevalent in low-income countries. In these countries, the World Bank found that progress in poverty reduction is the slowest, the poor live under the worst conditions, and the most affected persons are children age 12 and under. International initiatives Millennium Summit and Millennium Development Goals In September 2000, world leaders gathered at the Millennium Summit held in New York, launching the United Nations Millennium Project suggested by then UN Secretary-General Kofi Annan. Prior to the launch of the conference, the office of Secretary-General Annan released a report entitled "We The Peoples: The Role of the United Nations in the 21st Century". In this document, now widely known as the Millennium Report, Kofi Annan called on the international community to reduce the proportion of people in extreme poverty by half by 2015, a target that would affect over 1 billion people. Citing the close correlation between economic growth and the reduction of poverty in poor countries, Annan urged international leaders to indiscriminately target the problem of extreme poverty across every region. In charge of managing the project was Jeffrey Sachs, a noted development economist, who in 2005 released a plan for action called "Investing in Development: A Practical Plan to Achieve the Millennium Development Goals". Thomas Pogge criticized the 2000 Millennium Declaration for being less ambitious than a previous declaration from the World Food Summit due to using 1990 as the benchmark rather than 1996. Overall, there has been significant progress towards reducing extreme poverty, with the MDG1 target of reducing extreme poverty rates by half being met five years early, representing 700 million people being lifted out of extreme poverty from 1990 to 2010, with 1.2 billion people still remaining under those conditions. The notable exception to this trend was in Sub-Saharan Africa, the only region where the number of people living in extreme poverty rose from 290 million in 1990 to 414 million in 2010, comprising more than a third of those living in extreme poverty worldwide. 2005 World Summit The 2005 World Summit, held in September which was organized to measure international progress towards fulfilling the Millennium Development Goals (MDGs). Notably, the conference brought together more than 170 Heads of State. While world leaders at the summit were encouraged by the reduction of poverty in some nations, they were concerned by the uneven decline of poverty within and among different regions of the globe. However, at the end of the summit, the conference attendees reaffirmed the UN's commitment to achieve the MDGs by 2015 and urged all supranational, national and non-governmental organizations to follow suit. Sustainable Development Goals As the expiration of the Millennium Development Goals approached in 2015, the UN convened a panel to advise on a Post-2015 Development Agenda, which led to a new set of 17 goals for 2030 titled the Sustainable Development Goals (SDGs). The first goal (SDG 1) is to "End poverty in all its forms everywhere." The HLP report, entitled A New Global Partnership: Eradicate Poverty and Transform Economies Through Sustainable Development, was published in May 2013. In the report, the HLP wrote that: Ending extreme poverty is just the beginning, not the end. It is vital, but our vision must be broader: to start countries on the path of sustainable development – building on the foundations established by the 2012 UN Conference on Sustainable Development in Rio de Janeiro12, and meeting a challenge that no country, developed or developing, has met so far. We recommend to the Secretary-General that deliberations on a new development agenda must be guided by the vision of eradicating extreme poverty once and for all, in the context of sustainable development. Therefore, the report determined that a central goal of the Post-Millennium Development agenda is to eradicate extreme poverty by 2030. However, the report also emphasized that the MDGs were not enough on their own, as they did not "focus on the devastating effects of conflict and violence on development ... the importance to development of good governance and institution ... nor the need for inclusive growth..." Consequently, there now exists synergy between the policy position papers put forward by the United States (through USAID), the World Bank and the UN itself in terms of viewing fragility and a lack of good governance as exacerbating extreme poverty. However, in a departure from the views of other organizations, the commission also proposed that the UN focus not only on extreme poverty (a line drawn at $1.25), but also on a higher target, such as $2. The report notes this change could be made to reflect the fact that escaping extreme poverty is only a first step. In addition to the UN, a host of other supranational and national actors such as the European Union and the African Union have published their own positions or recommendations on what should be incorporated in the Post-2015 agenda. The European Commission's communication, published in A decent Life for all: from vision to collective action, affirmed the UN's commitment to "eradicate extreme poverty in our lifetime and put the world on a sustainable path to ensure a decent life for all by 2030". A unique vision of the report was the commission's environmental focus (in addition to a plethora of other goals such as combating hunger and gender inequality). Specifically, the Commission argued, "long-term poverty reduction ... requires inclusive and sustainable growth. Growth should create decent jobs, take place with resource efficiency and within planetary boundaries, and should support efforts to mitigate climate change." The African Union's report, entitled Common African Position (CAP) on the Post-2015 Development Agenda, likewise encouraged the international community to focus on eradicating the twin problems of poverty and exclusion in our lifetime. Moreover, the CAP pledged that "no person – regardless of ethnicity, gender, geography, disability, race or other status – is denied universal human rights and basic economic opportunities". Least developed country conferences The UN least developed country (LDC) conferences were a series of summits organized by the UN to promote the substantial and even development of the world's least developed countries. The first UN LDC Conference was held between 1 and 14 September 1981, in Paris, the first UN LDC Conference was organized to finalize the UN's "Substantial New Programme of Action" for the 1980s in Least Developed Countries. This program, which was unanimously adopted by the conference attendees, argued for internal reforms in LDCs (meant to encourage economic growth) to be complemented by strong international measures. However, despite the major economic and policy reforms initiated many of these LDCs, in addition to strong international aid, the economic situation of these countries worsened as a whole in the 1980s. This prompted the organization of a 2nd UN LDC conference almost a decade later. The second UN LDC Conference was held between 3 and 14 September 1990, once again in Paris, the second UN LDC Conference was convened to measure the progress made by the LDCs towards fulfilling their development goals during the 1980s. Recognizing the problems that plagued the LDCs over the past decade, the conference formulated a new set of national and international policies to accelerate the growth rates of the poorest nations. These new principles were embodied in the "Paris Declaration and Programme of Action for the Least

have been digitized and are publicly available online. Instruction set Babbage is not known to have written down an explicit set of instructions for the engine in the manner of a modern processor manual. Instead he showed his programs as lists of states during their execution, showing what operator was run at each step with little indication of how the control flow would be guided. Allan G. Bromley has assumed that the card deck could be read in forwards and backwards directions as a function of conditional branching after testing for conditions, which would make the engine Turing-complete: ...the cards could be ordered to move forward and reverse (and hence to loop)... The introduction for the first time, in 1845, of user operations for a variety of service functions including, most importantly, an effective system for user control of looping in user programs. There is no indication how the direction of turning of the operation and variable cards is specified. In the absence of other evidence I have had to adopt the minimal default assumption that both the operation and variable cards can only be turned backward as is necessary to implement the loops used in Babbage's sample programs. There would be no mechanical or microprogramming difficulty in placing the direction of motion under the control of the user. In their emulator of the engine, Fourmilab say: The Engine's Card Reader is not constrained to simply process the cards in a chain one after another from start to finish. It can, in addition, directed by the very cards it reads and advised by whether the Mill's run-up lever is activated, either advance the card chain forward, skipping the intervening cards, or backward, causing previously-read cards to be processed once again. This emulator does provide a written symbolic instruction set, though this has been constructed by its authors rather than based on Babbage's original works. For example, a factorial program would be written as: N0 6 N1 1 N2 1 × L1 L0 S1 – L0 L2 S0 L2 L0 CB?11 where the CB is the conditional branch instruction or "combination card" used to make the control flow jump, in this case backward by 11 cards. Influence Predicted influence Babbage understood that the existence of an automatic computer would kindle interest in the field now known as algorithmic efficiency, writing in his Passages from the Life of a Philosopher, "As soon as an Analytical Engine exists, it will necessarily guide the future course of the science. Whenever any result is sought by its aid, the question will then arise—By what course of calculation can these results be arrived at by the machine in the shortest time?" Computer science From 1872 Henry continued diligently with his father's work and then intermittently in retirement in 1875. Percy Ludgate wrote about the engine in 1914 and published his own design for an Analytical Engine in 1908. It was drawn up in detail, but never built, and the drawings have never been found. Ludgate's engine would be much smaller (about ) than Babbage's, and hypothetically would be capable of multiplying two 20-decimal-digit numbers in about six seconds. In his Essays on Automatics (1913) Leonardo Torres y Quevedo designed a Babbage type of calculating machine that used electromechanical parts which included floating point number representations and built an early prototype in 1920. Vannevar Bush's paper Instrumental Analysis (1936) included several references to Babbage's work. In the same year he started the Rapid Arithmetical Machine project to investigate the problems of constructing an electronic digital computer. Despite this groundwork, Babbage's work fell into historical obscurity, and the Analytical Engine was unknown to builders of electromechanical and electronic computing machines in the 1930s and 1940s when they began their work, resulting in the need to re-invent many of the architectural innovations Babbage had proposed. Howard Aiken, who built the quickly-obsoleted electromechanical calculator, the Harvard Mark I, between 1937 and 1945, praised Babbage's work likely as a way of enhancing his own stature, but knew nothing of the Analytical Engine's architecture during the construction of the Mark I, and considered his visit to the constructed portion of the Analytical Engine "the greatest disappointment of my life". The Mark I showed no influence from the Analytical Engine and lacked the Analytical Engine's most prescient architectural feature, conditional branching. J. Presper Eckert and John W. Mauchly similarly were not aware of the details of Babbage's Analytical Engine work prior to the completion of their design for the first electronic general-purpose computer, the ENIAC. Comparison to other early computers If the Analytical Engine had been built, it would have been digital, programmable and Turing-complete.

of programs ("formulae") and data, was to be provided to the machine via punched cards, a method being used at the time to direct mechanical looms such as the Jacquard loom. For output, the machine would have a printer, a curve plotter, and a bell. The machine would also be able to punch numbers onto cards to be read in later. It employed ordinary base-10 fixed-point arithmetic. There was to be a store (that is, a memory) capable of holding 1,000 numbers of 40 decimal digits each (ca. 16.6 kB). An arithmetic unit (the "mill") would be able to perform all four arithmetic operations, plus comparisons and optionally square roots. Initially (1838) it was conceived as a difference engine curved back upon itself, in a generally circular layout, with the long store exiting off to one side. Later drawings (1858) depict a regularised grid layout. Like the central processing unit (CPU) in a modern computer, the mill would rely upon its own internal procedures, to be stored in the form of pegs inserted into rotating drums called "barrels", to carry out some of the more complex instructions the user's program might specify. The programming language to be employed by users was akin to modern day assembly languages. Loops and conditional branching were possible, and so the language as conceived would have been Turing-complete as later defined by Alan Turing. Three different types of punch cards were used: one for arithmetical operations, one for numerical constants, and one for load and store operations, transferring numbers from the store to the arithmetical unit or back. There were three separate readers for the three types of cards. Babbage developed some two dozen programs for the Analytical Engine between 1837 and 1840, and one program later. These programs treat polynomials, iterative formulas, Gaussian elimination, and Bernoulli numbers. In 1842, the Italian mathematician Luigi Federico Menabrea published a description of the engine in French, based on lectures Babbage gave when he visited Turin in 1840. In 1843, the description was translated into English and extensively annotated by Ada Lovelace, who had become interested in the engine eight years earlier. In recognition of her additions to Menabrea's paper, which included a way to calculate Bernoulli numbers using the machine (widely considered to be the first complete computer program), she has been described as the first computer programmer. Construction Late in his life, Babbage sought ways to build a simplified version of the machine, and assembled a small part of it before his death in 1871. In 1878, a committee of the British Association for the Advancement of Science described the Analytical Engine as "a marvel of mechanical ingenuity", but recommended against constructing it. The committee acknowledged the usefulness and value of the machine, but could not estimate the cost of building it, and were unsure whether the machine would function correctly after being built. Intermittently from 1880 to 1910, Babbage's son Henry Prevost Babbage was constructing a part of the mill and the printing apparatus. In 1910, it was able to calculate a (faulty) list of multiples of pi. This constituted only a small part of the whole engine; it was not programmable and had no storage. (Popular images of this section have sometimes been mislabelled, implying that it was the entire mill or even the entire engine.) Henry Babbage's "Analytical Engine Mill" is on display at the Science Museum in London. Henry also proposed building a demonstration version of the full engine, with a smaller storage capacity: "perhaps for a first machine ten (columns) would do, with fifteen wheels in each". Such a version could manipulate 20 numbers of 25 digits each, and what it could be told to do with those numbers could still be impressive. "It is only a question of cards and time", wrote Henry Babbage in 1888, "... and there is no reason why (twenty thousand) cards should not be used if necessary, in an Analytical Engine for the purposes of the mathematician". In 1991, the London Science Museum built a complete and working specimen of Babbage's Difference Engine No. 2, a design that incorporated refinements Babbage discovered during the development of the Analytical Engine. This machine was built using materials and engineering tolerances that would have been available to Babbage, quelling the suggestion that Babbage's designs could not have been produced using the manufacturing technology of his time. In October 2010, John Graham-Cumming started a "Plan 28" campaign to raise funds by "public subscription" to enable serious historical and academic study of Babbage's plans, with a view to then build and test a fully working virtual design which will then in turn enable construction of the physical Analytical Engine. As of May 2016, actual construction had not been attempted, since no consistent understanding could yet be obtained from Babbage's original design drawings. In particular it was unclear whether it could handle the indexed variables which were required for Lovelace's Bernoulli program. By 2017, the "Plan 28" effort reported that a searchable database of all catalogued material was available, and an initial review of Babbage's voluminous Scribbling Books had been completed. Many of Babbage's original drawings have been digitized and are publicly available online. Instruction set Babbage is not known to have written down an explicit set of instructions for the engine in the manner of a modern processor manual. Instead he showed his programs as lists of states during their execution, showing what operator was run at each step with little indication of how the control flow would be guided. Allan G. Bromley has assumed that the card deck could be read in forwards and backwards directions as a function of conditional branching after testing for conditions, which would make the engine Turing-complete: ...the cards could be ordered to move forward and reverse (and hence to loop)... The introduction for the first time, in 1845, of

side with Brutus and Cassius could easily ally with a political opponent of Octavian if not appeased, and they also required land. There was no more government-controlled land to allot as settlements for their soldiers, so Octavian had to choose one of two options: alienating many Roman citizens by confiscating their land, or alienating many Roman soldiers who could mount a considerable opposition against him in the Roman heartland. Octavian chose the former. There were as many as eighteen Roman towns affected by the new settlements, with entire populations driven out or at least given partial evictions. Rebellion and marriage alliances There was widespread dissatisfaction with Octavian over these settlements of his soldiers, and this encouraged many to rally at the side of Lucius Antonius, who was brother of Mark Antony and supported by a majority in the Senate. Meanwhile, Octavian asked for a divorce from Claudia, the daughter of Fulvia (Mark Antony's wife) and her first husband Publius Clodius Pulcher. He returned Claudia to her mother, claiming that their marriage had never been consummated. Fulvia decided to take action. Together with Lucius Antonius, she raised an army in Italy to fight for Antony's rights against Octavian. Lucius and Fulvia took a political and martial gamble in opposing Octavian, however, since the Roman army still depended on the triumvirs for their salaries. Lucius and his allies ended up in a defensive siege at Perusia (modern Perugia), where Octavian forced them into surrender in early 40 BC. Lucius and his army were spared, due to his kinship with Antony, the strongman of the East, while Fulvia was exiled to Sicyon. Octavian showed no mercy, however, for the mass of allies loyal to Lucius; on 15 March, the anniversary of Julius Caesar's assassination, he had 300 Roman senators and equestrians executed for allying with Lucius. Perusia also was pillaged and burned as a warning for others. This bloody event sullied Octavian's reputation and was criticized by many, such as Augustan poet Sextus Propertius. Sextus Pompeius, the son of Pompey and still a renegade general following Julius Caesar's victory over his father, had established himself in Sicily and Sardinia as part of an agreement reached with the Second Triumvirate in 39 BC. Both Antony and Octavian were vying for an alliance with Pompeius. Octavian succeeded in a temporary alliance in 40 BC when he married Scribonia, a sister or daughter of Pompeius's father-in-law Lucius Scribonius Libo. Scribonia gave birth to Octavian's only natural child, Julia, the same day that he divorced her to marry Livia Drusilla, little more than a year after their marriage. While in Egypt, Antony had been engaged in an affair with Cleopatra and had fathered twin children with her. Aware of his deteriorating relationship with Octavian, Antony left Cleopatra; he sailed to Italy in 40 BC with a large force to oppose Octavian, laying siege to Brundisium. This new conflict proved untenable for both Octavian and Antony, however. Their centurions, who had become important figures politically, refused to fight due to their Caesarian cause, while the legions under their command followed suit. Meanwhile, in Sicyon, Antony's wife Fulvia died of a sudden illness while Antony was en route to meet her. Fulvia's death and the mutiny of their centurions allowed the two remaining triumvirs to effect a reconciliation. In the autumn of 40, Octavian and Antony approved the Treaty of Brundisium, by which Lepidus would remain in Africa, Antony in the East, Octavian in the West. The Italian Peninsula was left open to all for the recruitment of soldiers, but in reality, this provision was useless for Antony in the East. To further cement relations of alliance with Mark Antony, Octavian gave his sister, Octavia Minor, in marriage to Antony in late 40 BC. War with Pompeius Sextus Pompeius threatened Octavian in Italy by denying shipments of grain through the Mediterranean Sea to the peninsula. Pompeius's own son was put in charge as naval commander in the effort to cause widespread famine in Italy. Pompeius's control over the sea prompted him to take on the name Neptuni filius, "son of Neptune". A temporary peace agreement was reached in 39 BC with the treaty of Misenum; the blockade on Italy was lifted once Octavian granted Pompeius Sardinia, Corsica, Sicily, and the Peloponnese, and ensured him a future position as consul for 35 BC. The territorial agreement between the triumvirate and Sextus Pompeius began to crumble once Octavian divorced Scribonia and married Livia on 17 January 38 BC. One of Pompeius's naval commanders betrayed him and handed over Corsica and Sardinia to Octavian. Octavian lacked the resources to confront Pompeius alone, however, so an agreement was reached with the Second Triumvirate's extension for another five-year period beginning in 37 BC. In supporting Octavian, Antony expected to gain support for his own campaign against the Parthian Empire, desiring to avenge Rome's defeat at Carrhae in 53 BC. In an agreement reached at Tarentum, Antony provided 120 ships for Octavian to use against Pompeius, while Octavian was to send 20,000 legionaries to Antony for use against Parthia. Octavian sent only a tenth of those promised, however, which Antony viewed as an intentional provocation. Octavian and Lepidus launched a joint operation against Sextus in Sicily in 36 BC. Despite setbacks for Octavian, the naval fleet of Sextus Pompeius was almost entirely destroyed on 3 September by General Agrippa at the naval Battle of Naulochus. Sextus fled to the east with his remaining forces, where he was captured and executed in Miletus by one of Antony's generals the following year. As Lepidus and Octavian accepted the surrender of Pompeius's troops, Lepidus attempted to claim Sicily for himself, ordering Octavian to leave. Lepidus's troops deserted him, however, and defected to Octavian since they were weary of fighting and were enticed by Octavian's promises of money. Lepidus surrendered to Octavian and was permitted to retain the office of pontifex maximus (head of the college of priests), but was ejected from the Triumvirate, his public career at an end, and effectively was exiled to a villa at Cape Circei in Italy. The Roman dominions were now divided between Octavian in the West and Antony in the East. Octavian ensured Rome's citizens of their rights to property in order to maintain peace and stability in his portion of the Empire. This time, he settled his discharged soldiers outside of Italy, while also returning 30,000 slaves to their former Roman owners—slaves who had fled to join Pompeius's army and navy. Octavian had the Senate grant him, his wife, and his sister tribunal immunity, or sacrosanctitas, in order to ensure his own safety and that of Livia and Octavia once he returned to Rome. War with Antony and Cleopatra Meanwhile, Antony's campaign turned disastrous against Parthia, tarnishing his image as a leader, and the mere 2,000 legionaries sent by Octavian to Antony were hardly enough to replenish his forces. On the other hand, Cleopatra could restore his army to full strength; he already was engaged in a romantic affair with her, so he decided to send Octavia back to Rome. Octavian used this to spread propaganda implying that Antony was becoming less than Roman because he rejected a legitimate Roman spouse for an "Oriental paramour". In 36 BC, Octavian used a political ploy to make himself look less autocratic and Antony more the villain by proclaiming that the civil wars were coming to an end, and that he would step down as triumvir—if only Antony would do the same. Antony refused. Roman troops captured the Kingdom of Armenia in 34 BC, and Antony made his son Alexander Helios the ruler of Armenia. He also awarded the title "Queen of Kings" to Cleopatra, acts that Octavian used to convince the Roman Senate that Antony had ambitions to diminish the preeminence of Rome. Octavian became consul once again on 1 January 33 BC, and he opened the following session in the Senate with a vehement attack on Antony's grants of titles and territories to his relatives and to his queen. The breach between Antony and Octavian prompted a large portion of the Senators, as well as both of that year's consuls, to leave Rome and defect to Antony. However, Octavian received two key deserters from Antony in the autumn of 32 BC: Munatius Plancus and Marcus Titius. These defectors gave Octavian the information that he needed to confirm with the Senate all the accusations that he made against Antony. Octavian forcibly entered the temple of the Vestal Virgins and seized Antony's secret will, which he promptly publicized. The will would have given away Roman-conquered territories as kingdoms for his sons to rule, and designated Alexandria as the site for a tomb for him and his queen. In late 32 BC, the Senate officially revoked Antony's powers as consul and declared war on Cleopatra's regime in Egypt. In early 31 BC, Antony and Cleopatra were temporarily stationed in Greece when Octavian gained a preliminary victory: the navy successfully ferried troops across the Adriatic Sea under the command of Agrippa. Agrippa cut off Antony and Cleopatra's main force from their supply routes at sea, while Octavian landed on the mainland opposite the island of Corcyra (modern Corfu) and marched south. Trapped on land and sea, deserters of Antony's army fled to Octavian's side daily while Octavian's forces were comfortable enough to make preparations. Antony's fleet sailed through the bay of Actium on the western coast of Greece in a desperate attempt to break free of the naval blockade. It was there that Antony's fleet faced the much larger fleet of smaller, more maneuverable ships under commanders Agrippa and Gaius Sosius in the Battle of Actium on 2 September 31 BC. Antony and his remaining forces were spared only due to a last-ditch effort by Cleopatra's fleet that had been waiting nearby. Octavian pursued them and defeated their forces in Alexandria on 1 August 30 BC—after which Antony and Cleopatra committed suicide. Antony fell on his own sword and was taken by his soldiers back to Alexandria where he died in Cleopatra's arms. Cleopatra died soon after, reputedly by the venomous bite of an asp or by poison. Octavian had exploited his position as Caesar's heir to further his own political career, and he was well aware of the dangers in allowing another person to do the same. He therefore followed the advice of Arius Didymus that "two Caesars are one too many", ordering Caesarion, Julius Caesar's son by Cleopatra, killed, while sparing Cleopatra's children by Antony, with the exception of Antony's older son. Octavian had previously shown little mercy to surrendered enemies and acted in ways that had proven unpopular with the Roman people, yet he was given credit for pardoning many of his opponents after the Battle of Actium. Sole ruler of Rome After Actium and the defeat of Antony and Cleopatra, Octavian was in a position to rule the entire Republic under an unofficial principate—but he had to achieve this through incremental power gains. He did so by courting the Senate and the people while upholding the republican traditions of Rome, appearing that he was not aspiring to dictatorship or monarchy. Marching into Rome, Octavian and Marcus Agrippa were elected as consuls by the Senate. Years of civil war had left Rome in a state of near lawlessness, but the Republic was not prepared to accept the control of Octavian as a despot. At the same time, Octavian could not simply give up his authority without risking further civil wars among the Roman generals and, even if he desired no position of authority whatsoever, his position demanded that he look to the well-being of the city of Rome and the Roman provinces. Octavian's aims from this point forward were to return Rome to a state of stability, traditional legality, and civility by lifting the overt political pressure imposed on the courts of law and ensuring free elections—in name at least. First settlement In 27 BC, Octavian made a show of returning full power to the Roman Senate and relinquishing his control of the Roman provinces and their armies. Under his consulship, however, the Senate had little power in initiating legislation by introducing bills for senatorial debate. Octavian was no longer in direct control of the provinces and their armies, but he retained the loyalty of active duty soldiers and veterans alike. The careers of many clients and adherents depended on his patronage, as his financial power was unrivaled in the Roman Republic. Historian Werner Eck states: To a large extent, the public were aware of the vast financial resources that Octavian commanded. He failed to encourage enough senators to finance the building and maintenance of networks of roads in Italy in 20 BC, but he undertook direct responsibility for them. This was publicized on the Roman currency issued in 16 BC, after he donated vast amounts of money to the aerarium Saturni, the public treasury. According to historian H. H. Scullard, however, Octavian's power was based on the exercise of "a predominant military power and ... the ultimate sanction of his authority was force, however much the fact was disguised." The Senate proposed to Octavian, the victor of Rome's civil wars, that he once again assume command of the provinces. The Senate's proposal was a ratification of Octavian's extra-constitutional power. Through the Senate, Octavian was able to continue the appearance of a still-functional constitution. Feigning reluctance, he accepted a ten-year responsibility of overseeing provinces that were considered chaotic. The provinces ceded to Augustus for that ten-year period comprised much of the conquered Roman world, including all of Hispania and Gaul, Syria, Cilicia, Cyprus, and Egypt. Moreover, command of these provinces provided Octavian with control over the majority of Rome's legions. While Octavian acted as consul in Rome, he dispatched senators to the provinces under his command as his representatives to manage provincial affairs and ensure that his orders were carried out. The provinces not under Octavian's control were overseen by governors chosen by the Roman Senate. Octavian became the most powerful political figure in the city of Rome and in most of its provinces, but he did not have a monopoly on political and martial power. The Senate still controlled North Africa, an important regional producer of grain, as well as Illyria and Macedonia, two strategic regions with several legions. However, the Senate had control of only five or six legions distributed among three senatorial proconsuls, compared to the twenty legions under the control of Octavian, and their control of these regions did not amount to any political or military challenge to Octavian. The Senate's control over some of the Roman provinces helped maintain a republican façade for the autocratic Principate. Also, Octavian's control of entire provinces followed Republican-era precedents for the objective of securing peace and creating stability, in which such prominent Romans as Pompey had been granted similar military powers in times of crisis and instability. Change to Augustus On 16 January 27 BC the Senate gave Octavian the new titles of Augustus and Princeps. Augustus is from the Latin word Augere (meaning to increase) and can be translated as "the illustrious one". It was a title of religious authority rather than political authority. His new title of Augustus was also more favorable than Romulus, the previous one which he styled for himself in reference to the story of the legendary founder of Rome, which symbolized a second founding of Rome. The title of Romulus was associated too strongly with notions of monarchy and kingship, an image that Octavian tried to avoid. The title princeps senatus originally meant the member of the Senate with the highest precedence, but in the case of Augustus, it became an almost regnal title for a leader who was first in charge. As a result, modern historians usually regard this event as the beginning of Augustus' reign as "emperor". Augustus also styled himself as Imperator Caesar divi filius, "Commander Caesar son of the deified one". With this title, he boasted his familial link to deified Julius Caesar, and the use of Imperator signified a permanent link to the Roman tradition of victory. He transformed Caesar, a cognomen for one branch of the Julian family, into a new family line that began with him. Augustus was granted the right to hang the corona civica above his door, the "civic crown" made from oak, and to have laurels drape his doorposts. However, he renounced flaunting insignia of power such as holding a scepter, wearing a diadem, or wearing the golden crown and purple toga of his predecessor Julius Caesar. If he refused to symbolize his power by donning and bearing these items on his person, the Senate nonetheless awarded him with a golden shield displayed in the meeting hall of the Curia, bearing the inscription virtus, pietas, clementia, iustitia—"valor, piety, clemency, and justice." Second settlement By 23 BC, some of the un-Republican implications were becoming apparent concerning the settlement of 27 BC. Augustus's retention of an annual consulate drew attention to his de facto dominance over the Roman political system, and cut in half the opportunities for others to achieve what was still nominally the preeminent position in the Roman state. Further, he was causing political problems by desiring to have his nephew Marcus Claudius Marcellus follow in his footsteps and eventually assume the Principate in his turn, alienating his three greatest supporters – Agrippa, Maecenas, and Livia. He appointed noted Republican Calpurnius Piso (who had fought against Julius Caesar and supported Cassius and Brutus) as co-consul in 23 BC, after his choice Aulus Terentius Varro Murena died unexpectedly. In the late spring Augustus suffered a severe illness, and on his supposed deathbed made arrangements that would ensure the continuation of the Principate in some form, while allaying senators' suspicions of his anti-republicanism. Augustus prepared to hand down his signet ring to his favored general Agrippa. However, Augustus handed over to his co-consul Piso all of his official documents, an account of public finances, and authority over listed troops in the provinces while Augustus's supposedly favored nephew Marcellus came away empty-handed. This was a surprise to many who believed Augustus would have named an heir to his position as an unofficial emperor. Augustus bestowed only properties and possessions to his designated heirs, as an obvious system of institutionalized imperial inheritance would have provoked resistance and hostility among the republican-minded Romans fearful of monarchy. With regards to the Principate, it was obvious to Augustus that Marcellus was not ready to take on his position; nonetheless, by giving his signet ring to Agrippa, Augustus intended to signal to the legions that Agrippa was to be his successor, and that constitutional procedure notwithstanding, they should continue to obey Agrippa. Soon after his bout of illness subsided, Augustus gave up his consulship. The only other times Augustus would serve as consul would be in the years 5 and 2 BC, both times to introduce his grandsons into public life. This was a clever ploy by Augustus; ceasing to serve as one of two annually elected consuls allowed aspiring senators a better chance to attain the consular position, while allowing Augustus to exercise wider patronage within the senatorial class. Although Augustus had resigned as consul, he desired to retain his consular imperium not just in his provinces but throughout the empire. This desire, as well as the Marcus Primus Affair, led to a second compromise between him and the Senate known as the Second Settlement. Primary reasons for the Second settlement The primary reasons for the Second Settlement were as follows. First, after Augustus relinquished the annual consulship, he was no longer in an official position to rule the state, yet his dominant position remained unchanged over his Roman, 'imperial' provinces where he was still a proconsul. When he annually held the office of consul, he had the power to intervene with the affairs of the other provincial proconsuls appointed by the Senate throughout the empire, when he deemed necessary. A second problem later arose showing the need for the Second Settlement in what became known as the "Marcus Primus Affair". In late 24 or early 23 BC, charges were brought against Marcus Primus, the former proconsul (governor) of Macedonia, for waging a war without prior approval of the Senate on the Odrysian kingdom of Thrace, whose king was a Roman ally. He was defended by Lucius Lucinius Varro Murena, who told the trial that his client had received specific instructions from Augustus, ordering him to attack the client state. Later, Primus testified that the orders came from the recently deceased Marcellus. Such orders, had they been given, would have been considered a breach of the Senate's prerogative under the Constitutional settlement of 27 BC and its aftermath – i.e., before Augustus was granted imperium proconsulare maius – as Macedonia was a Senatorial province under the Senate's jurisdiction, not an imperial province under the authority of Augustus. Such an action would have ripped away the veneer of Republican restoration as promoted by Augustus, and exposed his fraud of merely being the first citizen, a first among equals. Even worse, the involvement of Marcellus provided some measure of proof that Augustus's policy was to have the youth take his place as Princeps, instituting a form of monarchy – accusations that had already played out. The situation was so serious that Augustus himself appeared at the trial, even though he had not been called as a witness. Under oath, Augustus declared that he gave no such order. Murena disbelieved Augustus's testimony and resented his attempt to subvert the trial by using his auctoritas. He rudely demanded to know why Augustus had turned up to a trial to which he had not been called; Augustus replied that he came in the public interest. Although Primus was found guilty, some jurors voted to acquit, meaning that not everybody believed Augustus's testimony, an insult to the 'August One'. The Second Constitutional Settlement was completed in part to allay confusion and formalize Augustus's legal authority to intervene in Senatorial provinces. The Senate granted Augustus a form of general imperium proconsulare, or proconsular imperium (power) that applied throughout the empire, not solely to his provinces. Moreover, the Senate augmented Augustus's proconsular imperium into imperium proconsulare maius, or proconsular imperium applicable throughout the empire that was more (maius) or greater than that held by the other proconsuls. This in effect gave Augustus constitutional power superior to all other proconsuls in the empire. Augustus stayed in Rome during the renewal process and provided veterans with lavish donations to gain their support, thereby ensuring that his status of proconsular imperium maius was renewed in 13 BC. Additional powers During the Second settlement, Augustus was also granted the power of a tribune (tribunicia potestas) for life, though not the official title of tribune. For some years, Augustus had been awarded tribunicia sacrosanctitas, the immunity given to a tribune of the plebs. Now he decided to assume the full powers of the magistracy, renewed annually, in perpetuity. Legally, it was closed to patricians, a status that Augustus had acquired some years earlier when adopted by Julius Caesar. This power allowed him to convene the Senate and people at will and lay business before them, to veto the actions of either the Assembly or the Senate, to preside over elections, and to speak first at any meeting. Also included in Augustus's tribunician authority were powers usually reserved for the Roman censor; these included the right to supervise public morals and scrutinize laws to ensure that they were in the public interest, as well as the ability to hold a census and determine the membership of the Senate. With the powers of a censor, Augustus appealed to virtues of Roman patriotism by banning all attire but the classic toga while entering the Forum. There was no precedent within the Roman system for combining the powers of the tribune and the censor into a single position, nor was Augustus ever elected to the office of censor. Julius Caesar had been granted similar powers, wherein he was charged with supervising the morals of the state. However, this position did not extend to the censor's ability to hold a census and determine the Senate's roster. The office of the tribunus plebis began to lose its prestige due to Augustus's amassing of tribunal powers, so he revived its importance by making it a mandatory appointment for any plebeian desiring the praetorship. Augustus was granted sole imperium within the city of Rome itself, in addition to being granted proconsular imperium maius and tribunician authority for life. Traditionally, proconsuls (Roman province governors) lost their proconsular "imperium" when they crossed the Pomerium – the sacred boundary of Rome – and entered the city. In these situations, Augustus would have power as part of his tribunician authority but his constitutional imperium within the Pomerium would be less than that of a serving consul. That would mean that, when he was in the city, he might not be the constitutional magistrate with the most authority. Thanks to his prestige or auctoritas, his wishes would usually be obeyed, but there might be some difficulty. To fill this power vacuum, the Senate voted that Augustus's imperium proconsulare maius (superior proconsular power) should not lapse when he was inside the city walls. All armed forces in the city had formerly been under the control of the urban praetors and consuls, but this situation now placed them under the sole authority of Augustus. In addition, the credit was given to Augustus for each subsequent Roman military victory after this time, because the majority of Rome's armies were stationed in imperial provinces commanded by Augustus through the legatus who were deputies of the princeps in the provinces. Moreover, if a battle was fought in a Senatorial province, Augustus's proconsular imperium maius allowed him to take command of (or credit for) any major military victory. This meant that Augustus was the only individual able to receive a triumph, a tradition that began with Romulus, Rome's first King and first triumphant general. Lucius Cornelius Balbus was the last man outside Augustus's family to receive this award, in 19 BC. Tiberius, Augustus's eldest stepson by Livia, was the only other general to receive a triumph—for victories in Germania in 7 BC. Normally during republican times, the powers Augustus held even after the Second Settlement would have been split between several people, who would each exercise them with the assistance of a colleague and for a specific period of time. Augustus held them all at once by himself, and with no time limits; even those that nominally had time limits were automatically renewed whenever they lapsed. Conspiracy Many of the political subtleties of the Second Settlement seem to have evaded the comprehension of the Plebeian class, who were Augustus's greatest supporters and clientele. This caused them to insist upon Augustus's participation in imperial affairs from time to time. Augustus failed to stand for election as consul in 22 BC, and fears arose once again that he was being forced from power by the aristocratic Senate. In 22, 21, and 19 BC, the people rioted in response, and only allowed a single consul to be elected for each of those years, ostensibly to leave the other position open for Augustus. Likewise, there was a food shortage in Rome in 22 BC which sparked panic, while many urban plebs called for Augustus to take on dictatorial powers to personally oversee the crisis. After a theatrical display of refusal before the Senate, Augustus finally accepted authority over Rome's grain supply "by virtue of his proconsular imperium", and ended the crisis almost immediately. It was not until AD 8 that a food crisis of this sort prompted Augustus to establish a praefectus annonae, a permanent prefect who was in charge of procuring food supplies for Rome. There were some who were concerned by the expansion of powers granted to Augustus by the Second Settlement, and this came to a head with the apparent conspiracy of Fannius Caepio. Some time prior to 1 September 22 BC, a certain Castricius provided Augustus with information about a conspiracy led by Fannius Caepio. Murena, the outspoken Consul who defended Primus in the Marcus Primus Affair, was named among the conspirators. The conspirators were tried in absentia with Tiberius acting as prosecutor; the jury found them guilty, but it was not a unanimous verdict. All the accused were sentenced to death for treason and executed as soon as they were captured—without ever giving testimony in their defence. Augustus ensured that the facade of Republican government continued with an effective cover-up of the events. In 19 BC, the Senate granted Augustus a form of 'general consular imperium', which was probably 'imperium consulare maius', like the proconsular powers that he received in 23 BC. Like his tribune authority, the consular powers were another instance of gaining power from offices that he did not actually hold. In addition, Augustus was allowed to wear the consul's insignia in public and before the Senate, as well as to sit in the symbolic chair between the two consuls and hold the fasces, an emblem of consular authority. This seems to have assuaged the populace; regardless of whether or not Augustus was a consul, the importance was that he both appeared as one before the people and could exercise consular power if necessary. On 6 March 12 BC, after the death of Lepidus, he additionally took up the position of pontifex maximus, the high priest of the college of the Pontiffs, the most important position in Roman religion. On 5 February 2 BC, Augustus was also given the title pater patriae, or "father of the country". Stability and staying power A final reason for the Second Settlement was to give the Principate constitutional stability and staying power in case something happened to Princeps Augustus. His illness of early 23 BC and the Caepio conspiracy showed that the regime's existence hung by the thin thread of the life of one man, Augustus himself, who suffered from several severe and dangerous illnesses throughout his life. If he were to die from natural causes or fall victim to assassination, Rome could be subjected to another round of civil war. The memories of Pharsalus, the Ides of March, the proscriptions, Philippi, and Actium, barely twenty-five years distant, were still vivid in the minds of many citizens. Proconsular imperium was conferred upon Agrippa for five years, similar to Augustus's power, in order to accomplish this constitutional stability. The exact nature of the grant is uncertain but it probably covered Augustus's imperial provinces, east and west, perhaps lacking authority over the provinces of the Senate. That came later, as did the jealously guarded tribunicia potestas. Augustus's accumulation of powers was now complete. War and expansion Augustus chose Imperator ("victorious commander") to be his first name, since he wanted to make an emphatically clear connection between himself and the notion of victory, and consequently became known as Imperator Caesar Divi Filius Augustus. By the year 13, Augustus boasted 21 occasions where his troops proclaimed "imperator" as his title after a successful battle. Almost the entire fourth chapter in his publicly released memoirs of achievements known as the Res Gestae was devoted to his military victories and honors. Augustus also promoted the ideal of a superior Roman civilization with a task of ruling the world (to the extent to which the Romans knew it), a sentiment embodied in words that the contemporary poet Virgil attributes to a legendary ancestor of Augustus: tu regere imperio populos, Romane, memento—"Roman, remember by your strength to rule the Earth's peoples!" The impulse for expansionism was apparently prominent among all classes at Rome, and it is accorded divine sanction by Virgil's Jupiter in Book 1 of the Aeneid, where Jupiter promises Rome imperium sine fine, "sovereignty without end". By the end of his reign, the armies of Augustus had conquered northern Hispania (modern Spain and Portugal) and the Alpine regions of Raetia and

and his allies ended up in a defensive siege at Perusia (modern Perugia), where Octavian forced them into surrender in early 40 BC. Lucius and his army were spared, due to his kinship with Antony, the strongman of the East, while Fulvia was exiled to Sicyon. Octavian showed no mercy, however, for the mass of allies loyal to Lucius; on 15 March, the anniversary of Julius Caesar's assassination, he had 300 Roman senators and equestrians executed for allying with Lucius. Perusia also was pillaged and burned as a warning for others. This bloody event sullied Octavian's reputation and was criticized by many, such as Augustan poet Sextus Propertius. Sextus Pompeius, the son of Pompey and still a renegade general following Julius Caesar's victory over his father, had established himself in Sicily and Sardinia as part of an agreement reached with the Second Triumvirate in 39 BC. Both Antony and Octavian were vying for an alliance with Pompeius. Octavian succeeded in a temporary alliance in 40 BC when he married Scribonia, a sister or daughter of Pompeius's father-in-law Lucius Scribonius Libo. Scribonia gave birth to Octavian's only natural child, Julia, the same day that he divorced her to marry Livia Drusilla, little more than a year after their marriage. While in Egypt, Antony had been engaged in an affair with Cleopatra and had fathered twin children with her. Aware of his deteriorating relationship with Octavian, Antony left Cleopatra; he sailed to Italy in 40 BC with a large force to oppose Octavian, laying siege to Brundisium. This new conflict proved untenable for both Octavian and Antony, however. Their centurions, who had become important figures politically, refused to fight due to their Caesarian cause, while the legions under their command followed suit. Meanwhile, in Sicyon, Antony's wife Fulvia died of a sudden illness while Antony was en route to meet her. Fulvia's death and the mutiny of their centurions allowed the two remaining triumvirs to effect a reconciliation. In the autumn of 40, Octavian and Antony approved the Treaty of Brundisium, by which Lepidus would remain in Africa, Antony in the East, Octavian in the West. The Italian Peninsula was left open to all for the recruitment of soldiers, but in reality, this provision was useless for Antony in the East. To further cement relations of alliance with Mark Antony, Octavian gave his sister, Octavia Minor, in marriage to Antony in late 40 BC. War with Pompeius Sextus Pompeius threatened Octavian in Italy by denying shipments of grain through the Mediterranean Sea to the peninsula. Pompeius's own son was put in charge as naval commander in the effort to cause widespread famine in Italy. Pompeius's control over the sea prompted him to take on the name Neptuni filius, "son of Neptune". A temporary peace agreement was reached in 39 BC with the treaty of Misenum; the blockade on Italy was lifted once Octavian granted Pompeius Sardinia, Corsica, Sicily, and the Peloponnese, and ensured him a future position as consul for 35 BC. The territorial agreement between the triumvirate and Sextus Pompeius began to crumble once Octavian divorced Scribonia and married Livia on 17 January 38 BC. One of Pompeius's naval commanders betrayed him and handed over Corsica and Sardinia to Octavian. Octavian lacked the resources to confront Pompeius alone, however, so an agreement was reached with the Second Triumvirate's extension for another five-year period beginning in 37 BC. In supporting Octavian, Antony expected to gain support for his own campaign against the Parthian Empire, desiring to avenge Rome's defeat at Carrhae in 53 BC. In an agreement reached at Tarentum, Antony provided 120 ships for Octavian to use against Pompeius, while Octavian was to send 20,000 legionaries to Antony for use against Parthia. Octavian sent only a tenth of those promised, however, which Antony viewed as an intentional provocation. Octavian and Lepidus launched a joint operation against Sextus in Sicily in 36 BC. Despite setbacks for Octavian, the naval fleet of Sextus Pompeius was almost entirely destroyed on 3 September by General Agrippa at the naval Battle of Naulochus. Sextus fled to the east with his remaining forces, where he was captured and executed in Miletus by one of Antony's generals the following year. As Lepidus and Octavian accepted the surrender of Pompeius's troops, Lepidus attempted to claim Sicily for himself, ordering Octavian to leave. Lepidus's troops deserted him, however, and defected to Octavian since they were weary of fighting and were enticed by Octavian's promises of money. Lepidus surrendered to Octavian and was permitted to retain the office of pontifex maximus (head of the college of priests), but was ejected from the Triumvirate, his public career at an end, and effectively was exiled to a villa at Cape Circei in Italy. The Roman dominions were now divided between Octavian in the West and Antony in the East. Octavian ensured Rome's citizens of their rights to property in order to maintain peace and stability in his portion of the Empire. This time, he settled his discharged soldiers outside of Italy, while also returning 30,000 slaves to their former Roman owners—slaves who had fled to join Pompeius's army and navy. Octavian had the Senate grant him, his wife, and his sister tribunal immunity, or sacrosanctitas, in order to ensure his own safety and that of Livia and Octavia once he returned to Rome. War with Antony and Cleopatra Meanwhile, Antony's campaign turned disastrous against Parthia, tarnishing his image as a leader, and the mere 2,000 legionaries sent by Octavian to Antony were hardly enough to replenish his forces. On the other hand, Cleopatra could restore his army to full strength; he already was engaged in a romantic affair with her, so he decided to send Octavia back to Rome. Octavian used this to spread propaganda implying that Antony was becoming less than Roman because he rejected a legitimate Roman spouse for an "Oriental paramour". In 36 BC, Octavian used a political ploy to make himself look less autocratic and Antony more the villain by proclaiming that the civil wars were coming to an end, and that he would step down as triumvir—if only Antony would do the same. Antony refused. Roman troops captured the Kingdom of Armenia in 34 BC, and Antony made his son Alexander Helios the ruler of Armenia. He also awarded the title "Queen of Kings" to Cleopatra, acts that Octavian used to convince the Roman Senate that Antony had ambitions to diminish the preeminence of Rome. Octavian became consul once again on 1 January 33 BC, and he opened the following session in the Senate with a vehement attack on Antony's grants of titles and territories to his relatives and to his queen. The breach between Antony and Octavian prompted a large portion of the Senators, as well as both of that year's consuls, to leave Rome and defect to Antony. However, Octavian received two key deserters from Antony in the autumn of 32 BC: Munatius Plancus and Marcus Titius. These defectors gave Octavian the information that he needed to confirm with the Senate all the accusations that he made against Antony. Octavian forcibly entered the temple of the Vestal Virgins and seized Antony's secret will, which he promptly publicized. The will would have given away Roman-conquered territories as kingdoms for his sons to rule, and designated Alexandria as the site for a tomb for him and his queen. In late 32 BC, the Senate officially revoked Antony's powers as consul and declared war on Cleopatra's regime in Egypt. In early 31 BC, Antony and Cleopatra were temporarily stationed in Greece when Octavian gained a preliminary victory: the navy successfully ferried troops across the Adriatic Sea under the command of Agrippa. Agrippa cut off Antony and Cleopatra's main force from their supply routes at sea, while Octavian landed on the mainland opposite the island of Corcyra (modern Corfu) and marched south. Trapped on land and sea, deserters of Antony's army fled to Octavian's side daily while Octavian's forces were comfortable enough to make preparations. Antony's fleet sailed through the bay of Actium on the western coast of Greece in a desperate attempt to break free of the naval blockade. It was there that Antony's fleet faced the much larger fleet of smaller, more maneuverable ships under commanders Agrippa and Gaius Sosius in the Battle of Actium on 2 September 31 BC. Antony and his remaining forces were spared only due to a last-ditch effort by Cleopatra's fleet that had been waiting nearby. Octavian pursued them and defeated their forces in Alexandria on 1 August 30 BC—after which Antony and Cleopatra committed suicide. Antony fell on his own sword and was taken by his soldiers back to Alexandria where he died in Cleopatra's arms. Cleopatra died soon after, reputedly by the venomous bite of an asp or by poison. Octavian had exploited his position as Caesar's heir to further his own political career, and he was well aware of the dangers in allowing another person to do the same. He therefore followed the advice of Arius Didymus that "two Caesars are one too many", ordering Caesarion, Julius Caesar's son by Cleopatra, killed, while sparing Cleopatra's children by Antony, with the exception of Antony's older son. Octavian had previously shown little mercy to surrendered enemies and acted in ways that had proven unpopular with the Roman people, yet he was given credit for pardoning many of his opponents after the Battle of Actium. Sole ruler of Rome After Actium and the defeat of Antony and Cleopatra, Octavian was in a position to rule the entire Republic under an unofficial principate—but he had to achieve this through incremental power gains. He did so by courting the Senate and the people while upholding the republican traditions of Rome, appearing that he was not aspiring to dictatorship or monarchy. Marching into Rome, Octavian and Marcus Agrippa were elected as consuls by the Senate. Years of civil war had left Rome in a state of near lawlessness, but the Republic was not prepared to accept the control of Octavian as a despot. At the same time, Octavian could not simply give up his authority without risking further civil wars among the Roman generals and, even if he desired no position of authority whatsoever, his position demanded that he look to the well-being of the city of Rome and the Roman provinces. Octavian's aims from this point forward were to return Rome to a state of stability, traditional legality, and civility by lifting the overt political pressure imposed on the courts of law and ensuring free elections—in name at least. First settlement In 27 BC, Octavian made a show of returning full power to the Roman Senate and relinquishing his control of the Roman provinces and their armies. Under his consulship, however, the Senate had little power in initiating legislation by introducing bills for senatorial debate. Octavian was no longer in direct control of the provinces and their armies, but he retained the loyalty of active duty soldiers and veterans alike. The careers of many clients and adherents depended on his patronage, as his financial power was unrivaled in the Roman Republic. Historian Werner Eck states: To a large extent, the public were aware of the vast financial resources that Octavian commanded. He failed to encourage enough senators to finance the building and maintenance of networks of roads in Italy in 20 BC, but he undertook direct responsibility for them. This was publicized on the Roman currency issued in 16 BC, after he donated vast amounts of money to the aerarium Saturni, the public treasury. According to historian H. H. Scullard, however, Octavian's power was based on the exercise of "a predominant military power and ... the ultimate sanction of his authority was force, however much the fact was disguised." The Senate proposed to Octavian, the victor of Rome's civil wars, that he once again assume command of the provinces. The Senate's proposal was a ratification of Octavian's extra-constitutional power. Through the Senate, Octavian was able to continue the appearance of a still-functional constitution. Feigning reluctance, he accepted a ten-year responsibility of overseeing provinces that were considered chaotic. The provinces ceded to Augustus for that ten-year period comprised much of the conquered Roman world, including all of Hispania and Gaul, Syria, Cilicia, Cyprus, and Egypt. Moreover, command of these provinces provided Octavian with control over the majority of Rome's legions. While Octavian acted as consul in Rome, he dispatched senators to the provinces under his command as his representatives to manage provincial affairs and ensure that his orders were carried out. The provinces not under Octavian's control were overseen by governors chosen by the Roman Senate. Octavian became the most powerful political figure in the city of Rome and in most of its provinces, but he did not have a monopoly on political and martial power. The Senate still controlled North Africa, an important regional producer of grain, as well as Illyria and Macedonia, two strategic regions with several legions. However, the Senate had control of only five or six legions distributed among three senatorial proconsuls, compared to the twenty legions under the control of Octavian, and their control of these regions did not amount to any political or military challenge to Octavian. The Senate's control over some of the Roman provinces helped maintain a republican façade for the autocratic Principate. Also, Octavian's control of entire provinces followed Republican-era precedents for the objective of securing peace and creating stability, in which such prominent Romans as Pompey had been granted similar military powers in times of crisis and instability. Change to Augustus On 16 January 27 BC the Senate gave Octavian the new titles of Augustus and Princeps. Augustus is from the Latin word Augere (meaning to increase) and can be translated as "the illustrious one". It was a title of religious authority rather than political authority. His new title of Augustus was also more favorable than Romulus, the previous one which he styled for himself in reference to the story of the legendary founder of Rome, which symbolized a second founding of Rome. The title of Romulus was associated too strongly with notions of monarchy and kingship, an image that Octavian tried to avoid. The title princeps senatus originally meant the member of the Senate with the highest precedence, but in the case of Augustus, it became an almost regnal title for a leader who was first in charge. As a result, modern historians usually regard this event as the beginning of Augustus' reign as "emperor". Augustus also styled himself as Imperator Caesar divi filius, "Commander Caesar son of the deified one". With this title, he boasted his familial link to deified Julius Caesar, and the use of Imperator signified a permanent link to the Roman tradition of victory. He transformed Caesar, a cognomen for one branch of the Julian family, into a new family line that began with him. Augustus was granted the right to hang the corona civica above his door, the "civic crown" made from oak, and to have laurels drape his doorposts. However, he renounced flaunting insignia of power such as holding a scepter, wearing a diadem, or wearing the golden crown and purple toga of his predecessor Julius Caesar. If he refused to symbolize his power by donning and bearing these items on his person, the Senate nonetheless awarded him with a golden shield displayed in the meeting hall of the Curia, bearing the inscription virtus, pietas, clementia, iustitia—"valor, piety, clemency, and justice." Second settlement By 23 BC, some of the un-Republican implications were becoming apparent concerning the settlement of 27 BC. Augustus's retention of an annual consulate drew attention to his de facto dominance over the Roman political system, and cut in half the opportunities for others to achieve what was still nominally the preeminent position in the Roman state. Further, he was causing political problems by desiring to have his nephew Marcus Claudius Marcellus follow in his footsteps and eventually assume the Principate in his turn, alienating his three greatest supporters – Agrippa, Maecenas, and Livia. He appointed noted Republican Calpurnius Piso (who had fought against Julius Caesar and supported Cassius and Brutus) as co-consul in 23 BC, after his choice Aulus Terentius Varro Murena died unexpectedly. In the late spring Augustus suffered a severe illness, and on his supposed deathbed made arrangements that would ensure the continuation of the Principate in some form, while allaying senators' suspicions of his anti-republicanism. Augustus prepared to hand down his signet ring to his favored general Agrippa. However, Augustus handed over to his co-consul Piso all of his official documents, an account of public finances, and authority over listed troops in the provinces while Augustus's supposedly favored nephew Marcellus came away empty-handed. This was a surprise to many who believed Augustus would have named an heir to his position as an unofficial emperor. Augustus bestowed only properties and possessions to his designated heirs, as an obvious system of institutionalized imperial inheritance would have provoked resistance and hostility among the republican-minded Romans fearful of monarchy. With regards to the Principate, it was obvious to Augustus that Marcellus was not ready to take on his position; nonetheless, by giving his signet ring to Agrippa, Augustus intended to signal to the legions that Agrippa was to be his successor, and that constitutional procedure notwithstanding, they should continue to obey Agrippa. Soon after his bout of illness subsided, Augustus gave up his consulship. The only other times Augustus would serve as consul would be in the years 5 and 2 BC, both times to introduce his grandsons into public life. This was a clever ploy by Augustus; ceasing to serve as one of two annually elected consuls allowed aspiring senators a better chance to attain the consular position, while allowing Augustus to exercise wider patronage within the senatorial class. Although Augustus had resigned as consul, he desired to retain his consular imperium not just in his provinces but throughout the empire. This desire, as well as the Marcus Primus Affair, led to a second compromise between him and the Senate known as the Second Settlement. Primary reasons for the Second settlement The primary reasons for the Second Settlement were as follows. First, after Augustus relinquished the annual consulship, he was no longer in an official position to rule the state, yet his dominant position remained unchanged over his Roman, 'imperial' provinces where he was still a proconsul. When he annually held the office of consul, he had the power to intervene with the affairs of the other provincial proconsuls appointed by the Senate throughout the empire, when he deemed necessary. A second problem later arose showing the need for the Second Settlement in what became known as the "Marcus Primus Affair". In late 24 or early 23 BC, charges were brought against Marcus Primus, the former proconsul (governor) of Macedonia, for waging a war without prior approval of the Senate on the Odrysian kingdom of Thrace, whose king was a Roman ally. He was defended by Lucius Lucinius Varro Murena, who told the trial that his client had received specific instructions from Augustus, ordering him to attack the client state. Later, Primus testified that the orders came from the recently deceased Marcellus. Such orders, had they been given, would have been considered a breach of the Senate's prerogative under the Constitutional settlement of 27 BC and its aftermath – i.e., before Augustus was granted imperium proconsulare maius – as Macedonia was a Senatorial province under the Senate's jurisdiction, not an imperial province under the authority of Augustus. Such an action would have ripped away the veneer of Republican restoration as promoted by Augustus, and exposed his fraud of merely being the first citizen, a first among equals. Even worse, the involvement of Marcellus provided some measure of proof that Augustus's policy was to have the youth take his place as Princeps, instituting a form of monarchy – accusations that had already played out. The situation was so serious that Augustus himself appeared at the trial, even though he had not been called as a witness. Under oath, Augustus declared that he gave no such order. Murena disbelieved Augustus's testimony and resented his attempt to subvert the trial by using his auctoritas. He rudely demanded to know why Augustus had turned up to a trial to which he had not been called; Augustus replied that he came in the public interest. Although Primus was found guilty, some jurors voted to acquit, meaning that not everybody believed Augustus's testimony, an insult to the 'August One'. The Second Constitutional Settlement was completed in part to allay confusion and formalize Augustus's legal authority to intervene in Senatorial provinces. The Senate granted Augustus a form of general imperium proconsulare, or proconsular imperium (power) that applied throughout the empire, not solely to his provinces. Moreover, the Senate augmented Augustus's proconsular imperium into imperium proconsulare maius, or proconsular imperium applicable throughout the empire that was more (maius) or greater than that held by the other proconsuls. This in effect gave Augustus constitutional power superior to all other proconsuls in the empire. Augustus stayed in Rome during the renewal process and provided veterans with lavish donations to gain their support, thereby ensuring that his status of proconsular imperium maius was renewed in 13 BC. Additional powers During the Second settlement, Augustus was also granted the power of a tribune (tribunicia potestas) for life, though not the official title of tribune. For some years, Augustus had been awarded tribunicia sacrosanctitas, the immunity given to a tribune of the plebs. Now he decided to assume the full powers of the magistracy, renewed annually, in perpetuity. Legally, it was closed to patricians, a status that Augustus had acquired some years earlier when adopted by Julius Caesar. This power allowed him to convene the Senate and people at will and lay business before them, to veto the actions of either the Assembly or the Senate, to preside over elections, and to speak first at any meeting. Also included in Augustus's tribunician authority were powers usually reserved for the Roman censor; these included the right to supervise public morals and scrutinize laws to ensure that they were in the public interest, as well as the ability to hold a census and determine the membership of the Senate. With the powers of a censor, Augustus appealed to virtues of Roman patriotism by banning all attire but the classic toga while entering the Forum. There was no precedent within the Roman system for combining the powers of the tribune and the censor into a single position, nor was Augustus ever elected to the office of censor. Julius Caesar had been granted similar powers, wherein he was charged with supervising the morals of the state. However, this position did not extend to the censor's ability to hold a census and determine the Senate's roster. The office of the tribunus plebis began to lose its prestige due to Augustus's amassing of tribunal powers, so he revived its importance by making it a mandatory appointment for any plebeian desiring the praetorship. Augustus was granted sole imperium within the city of Rome itself, in addition to being granted proconsular imperium maius and tribunician authority for life. Traditionally, proconsuls (Roman province governors) lost their proconsular "imperium" when they crossed the Pomerium – the sacred boundary of Rome – and entered the city. In these situations, Augustus would have power as part of his tribunician authority but his constitutional imperium within the Pomerium would be less than that of a serving consul. That would mean that, when he was in the city, he might not be the constitutional magistrate with the most authority. Thanks to his prestige or auctoritas, his wishes would usually be obeyed, but there might be some difficulty. To fill this power vacuum, the Senate voted that Augustus's imperium proconsulare maius (superior proconsular power) should not lapse when he was inside the city walls. All armed forces in the city had formerly been under the control of the urban praetors and consuls, but this situation now placed them under the sole authority of Augustus. In addition, the credit was given to Augustus for each subsequent Roman military victory after this time, because the majority of Rome's armies were stationed in imperial provinces commanded by Augustus through the legatus who were deputies of the princeps in the provinces. Moreover, if a battle was fought in a Senatorial province, Augustus's proconsular imperium maius allowed him to take command of (or credit for) any major military victory. This meant that Augustus was the only individual able to receive a triumph, a tradition that began with Romulus, Rome's first King and first triumphant general. Lucius Cornelius Balbus was the last man outside Augustus's family to receive this award, in 19 BC. Tiberius, Augustus's eldest stepson by Livia, was the only other general to receive a triumph—for victories in Germania in 7 BC. Normally during republican times, the powers Augustus held even after the Second Settlement would have been split between several people, who would each exercise them with the assistance of a colleague and for a specific period of time. Augustus held them all at once by himself, and with no time limits; even those that nominally had time limits were automatically renewed whenever they lapsed. Conspiracy Many of the political subtleties of the Second Settlement seem to have evaded the comprehension of the Plebeian class, who were Augustus's greatest supporters and clientele. This caused them to insist upon Augustus's participation in imperial affairs from time to time. Augustus failed to stand for election as consul in 22 BC, and fears arose once again that he was being forced from power by the aristocratic Senate. In 22, 21, and 19 BC, the people rioted in response, and only allowed a single consul to be elected for each of those years, ostensibly to leave the other position open for Augustus. Likewise, there was a food shortage in Rome in 22 BC which sparked panic, while many urban plebs called for Augustus to take on dictatorial powers to personally oversee the crisis. After a theatrical display of refusal before the Senate, Augustus finally accepted authority over Rome's grain supply "by virtue of his proconsular imperium", and ended the crisis almost immediately. It was not until AD 8 that a food crisis of this sort prompted Augustus to establish a praefectus annonae, a permanent prefect who was in charge of procuring food supplies for Rome. There were some who were concerned by the expansion of powers granted to Augustus by the Second Settlement, and this came to a head with the apparent conspiracy of Fannius Caepio. Some time prior to 1 September 22 BC, a certain Castricius provided Augustus with information about a conspiracy led by Fannius Caepio. Murena, the outspoken Consul who defended Primus in the Marcus Primus Affair, was named among the conspirators. The conspirators were tried in absentia with Tiberius acting as prosecutor; the jury found them guilty, but it was not a unanimous verdict. All the accused were sentenced to death for treason and executed as soon as they were captured—without ever giving testimony in their defence. Augustus ensured that the facade of Republican government continued with an effective cover-up of the events. In 19 BC, the Senate granted Augustus a form of 'general consular imperium', which was probably 'imperium consulare maius', like the proconsular powers that he received in 23 BC. Like his tribune authority, the consular powers were another instance of gaining power from offices that he did not actually hold. In addition, Augustus was allowed to wear the consul's insignia in public and before the Senate, as well as to sit in the symbolic chair between the two consuls and hold the fasces, an emblem of consular authority. This seems to have assuaged the populace; regardless of whether or not Augustus was a consul, the importance was that he both appeared as one before the people and could exercise consular power if necessary. On 6 March 12 BC, after the death of Lepidus, he additionally took up the position of pontifex maximus, the high priest of the college of the Pontiffs, the most important position in Roman religion. On 5 February 2 BC, Augustus was also given the title pater patriae, or "father of the country". Stability and staying power A final reason for the Second Settlement was to give the Principate constitutional stability and staying power in case something happened to Princeps Augustus. His illness of early 23 BC and the Caepio conspiracy showed that the regime's existence hung by the thin thread of the life of one man, Augustus himself, who suffered from several severe and dangerous illnesses throughout his life. If he were to die from natural causes or fall victim to assassination, Rome could be subjected to another round of civil war. The memories of Pharsalus, the Ides of March, the proscriptions, Philippi, and Actium, barely twenty-five years distant, were still vivid in the minds of many citizens. Proconsular imperium was conferred upon Agrippa for five years, similar to Augustus's power, in order to accomplish this constitutional stability. The exact nature of the grant is uncertain but it probably covered Augustus's imperial provinces, east and west, perhaps lacking authority over the provinces of the Senate. That came later, as did the jealously guarded tribunicia potestas. Augustus's accumulation of powers was now complete. War and expansion Augustus chose Imperator ("victorious commander") to be his first name, since he wanted to make an emphatically clear connection between himself and the notion of victory, and consequently became known as Imperator Caesar Divi Filius Augustus. By the year 13, Augustus boasted 21 occasions where his troops proclaimed "imperator" as his title after a successful battle. Almost the entire fourth chapter in his publicly released memoirs of achievements known as the Res Gestae was devoted to his military victories and honors. Augustus also promoted the ideal of a superior Roman civilization with a task of ruling the world (to the extent to which the Romans knew it), a sentiment embodied in words that the contemporary poet Virgil attributes to a legendary ancestor of Augustus: tu regere imperio populos, Romane, memento—"Roman, remember by your strength to rule the Earth's peoples!" The impulse for expansionism was apparently prominent among all classes at Rome, and it is accorded divine sanction by Virgil's Jupiter in Book 1 of the Aeneid, where Jupiter promises Rome imperium sine fine, "sovereignty without end". By the end of his reign, the armies of Augustus had conquered northern Hispania (modern Spain and Portugal) and the Alpine regions of Raetia and Noricum (modern Switzerland, Bavaria, Austria, Slovenia), Illyricum and Pannonia (modern Albania, Croatia, Hungary, Serbia, etc.), and had extended the borders of Africa Proconsularis to the east and south. Judea was added to the province of Syria when Augustus deposed Herod Archelaus, successor to client king Herod the Great (73–4 BC). Syria (like Egypt after Antony) was governed by a high prefect of the equestrian class rather than by a proconsul or legate of Augustus. Again, no military effort was needed in 25 BC when Galatia (modern Turkey) was converted to a Roman province shortly after Amyntas of Galatia was killed by an avenging widow of a slain prince from Homonada. The rebellious tribes of Asturias and Cantabria in modern-day Spain were finally quelled in 19 BC, and the territory fell under the provinces of Hispania and Lusitania. This region proved to be a major asset in funding Augustus's future military campaigns, as it was rich in mineral deposits that could be fostered in Roman mining projects, especially the very rich gold deposits at Las Medulas. Conquering the peoples of the Alps in 16 BC was another important victory for Rome, since it provided a large territorial buffer between the Roman citizens of Italy and Rome's enemies in Germania to the north. Horace dedicated an ode to the victory, while the monumental Trophy of Augustus near Monaco was built to honor the occasion. The capture of the Alpine region also served the next offensive in 12 BC, when Tiberius began the offensive against the Pannonian tribes of Illyricum, and his brother Nero Claudius Drusus moved against the Germanic tribes of the eastern Rhineland. Both campaigns were successful, as Drusus's forces reached the Elbe River by 9 BC—though he died shortly after by falling off his horse. It was recorded that the pious Tiberius walked in front of his brother's body all the way back to Rome. To protect Rome's eastern territories from the Parthian Empire, Augustus relied on the client states of the east to act as territorial buffers and areas that could raise their own troops for defense. To ensure security of the Empire's eastern flank, Augustus stationed a Roman army in Syria, while his skilled stepson Tiberius negotiated with the Parthians as Rome's diplomat to the East. Tiberius was responsible for restoring Tigranes V to the throne of the Kingdom of Armenia. Yet arguably his greatest diplomatic achievement was negotiating with Phraates IV of Parthia (37–2 BC) in 20 BC for the return of the battle standards lost by Crassus in the Battle of Carrhae, a symbolic victory and great boost of morale for Rome. Werner Eck claims that this was a great disappointment for Romans seeking to avenge Crassus's defeat by military means. However, Maria Brosius explains that Augustus used the return of the standards as propaganda symbolizing the submission of Parthia to Rome. The event was celebrated in art such as the breastplate design on the statue Augustus of Prima Porta and in monuments such as the Temple of Mars Ultor ('Mars the Avenger') built to house the standards. Parthia had always posed a threat to Rome in the east, but the real battlefront was along the Rhine and Danube rivers. Before the final fight with Antony, Octavian's campaigns against the tribes in Dalmatia were the first step in expanding Roman dominions to the Danube. Victory in battle was not always a permanent success, as newly conquered territories were constantly retaken by Rome's enemies in Germania. A prime example of Roman loss in battle was the Battle of Teutoburg Forest in AD 9, where three entire legions led by Publius Quinctilius Varus were destroyed by Arminius, leader of the Cherusci, an apparent Roman ally. Augustus retaliated by dispatching Tiberius

or, depending on definition, the southern Pacific, Atlantic, and Indian Oceans. It has an area of more than 14 million km2. Some 98% of Antarctica is covered by the Antarctic ice sheet, the world's largest ice sheet and also its largest reservoir of fresh water. Averaging at least 1.6 km thick, the ice is so massive that it has depressed the continental bedrock in some areas more than 2.5 km below sea level; subglacial lakes of liquid water also occur (e.g., Lake Vostok). Ice shelves and rises populate the ice sheet on the periphery. In September 2018, researchers at the National Geospatial-Intelligence Agency released a high resolution terrain map (detail down to the size of a car, and less in some areas) of Antarctica, named the "Reference Elevation Model of Antarctica" (REMA). Regions Physically, Antarctica is divided in two by Transantarctic Mountains close to the neck between the Ross Sea and the Weddell Sea. Western Antarctica and Eastern Antarctica correspond roughly to the eastern and western hemispheres relative to the Greenwich meridian. This usage has been regarded as Eurocentric by some, and the alternative terms Lesser Antarctica and Greater Antarctica (respectively) are sometimes preferred. Lesser Antarctica is covered by the West Antarctic Ice Sheet. There has been some concern about this ice sheet, because there is a small chance that it will collapse. If it does, ocean levels would rise by a few metres in a very short period of time. Volcanoes Volcanoes that occur underneath glacial ice sheets are known by the term "Glaciovolcanism", or subglacial volcanoes. An article published in 2017 claims that researchers from Edinburgh University recently discovered 91 new volcanoes below the Antarctic ice sheet, adding to the 47 volcanoes that were already known. As of today, there have been 138 possible volcanoes identified in West Antarctica. There is limited knowledge about West Antarctic Volcanoes due to the presence of the West Antarctic Ice Sheet, which heavily covers the West Antarctic Rift System—a likely hub for volcanic activity. Researchers find it difficult to properly identify volcanic activity due to the comprehensive ice covering. East Antarctica is significantly larger than West Antarctica, and similarly remains widely unexplored in terms of its volcanic potential. While there are some indications that there is volcanic activity under the East Antarctic Ice Sheet, there is not a significant amount of present information on the subject. Mount Erebus is one of the most notable sites in the study of Antarctic Volcanism, in that it is the southernmost historically active volcanic site on the planet. Deception Island is another active Antarctic volcano. It is one of the most protected areas in the Antarctic, given its situation between the South Shetland Islands and the Antarctic Peninsula. As the most active volcano in the Antarctic peninsula, it has been studied closely since its initial discovery in 1820. There are four volcanoes on the mainland of Antarctica that are considered to be active on the basis of observed fumarolic activity or "recent" tephra deposits: Mount Melbourne (2,730 m) (74°21'S., 164°42'E.), a stratovolcano; Mount Berlin (3,500 m) (76°03'S., 135°52'W.), a stratovolcano; Mount Kauffman (2,365 m) (75°37'S., 132°25'W.), a stratovolcano; and Mount Hampton (3,325 m) (76°29'S., 125°48'W.), a volcanic caldera. Mount Rittmann (2,600 m) (73.45°S 165.5° E), a volcanic caldera. Several volcanoes on offshore islands have records of historic activity. Mount Erebus (3,795 m), a stratovolcano on Ross Island with 10 known eruptions and 1 suspected eruption. On the opposite side of the continent, Deception Island (62°57'S., 60°38'W.), a volcanic caldera with 10 known and 4 suspected eruptions, have been the most active. Buckle Island in the Balleny Islands (66°50'S., 163°12'E.), Penguin Island (62°06'S., 57°54'W.), Paulet Island (63°35'S., 55°47'W.), and Lindenberg Island (64°55'S., 59°40'W.) are also considered to be active. In 2017, the researchers of Edinburgh University discovered 91 underwater volcanoes under West Antarctica. Glaciovolcanism The definition of Glaciovolcanism is “the interactions of magma with ice in all its forms, including snow, firn and any meltwater.” It defines a special field of volcanic that is specifically centered around ice and ice melt. This field of science is less than 100 years old, and thus continuously makes new discoveries. Glaciovolcanism is characterized by three kinds of eruptions: sub-glacial eruptions, supraglacial volcanism, and ice-marginal volcanism. The study of glaciovolcanism is vital to the understanding of ice sheet formation. It is also a valuable tool to predict volcanic hazards, such as the ash hazard following the Eyjafjallajökull eruption in Iceland. Marie Byrd Land The Marie Byrd Land is an incredibly large portion of West Antarctica, consisting of the Area below the Antarctic Peninsula. The Marie Byrd land is a large formation of volcanic rock, characterized by 18 exposed and subglacial volcanoes. 16 of the 18 volcanoes are entirely covered by the antarctic ice sheet. There have been no eruptions recorded from any of the volcanoes in this area, however scientists believe that some of the volcanoes may be potentially active. Activity Scientists and researchers debate whether or not the 138 identified possible volcanoes are active or dormant. It is very hard to definitively say, given that many of these volcanic structures are buried underneath several kilometers of ice. However, ash layers within the West Antarctic Ice Sheet, as well as deformations in the ice surface indicate that the West Antarctic Rift System could be active and contain erupting volcanoes. Additionally, seismic activity in the region hints at magma movement beneath the crust, a sign of volcanic activity. Despite this, however, there is not yet definitive evidence of presently active volcanoes. Subglacial volcanism is often characterized by ice melt and subglacial water. Though there are other sources of subglacial water, such as geothermal heat, it almost always is a condition of volcanism. Scientists remain uncertain about the presence of water underneath the West Antarctic Ice Sheet, with some claiming to have found

widely and grow upwards relatively slowly. However, West Antarctic Volcanoes form underneath ice sheets, and are thus categorized as subglacial volcanoes. Subglacial volcanoes that are monogenetic are far more narrow, steeper, flat topped structures. Polygenetic subglacial volcanoes have a wider variety of shapes and sizes due to being made up of many different eruptions. Often, they look more cone shaped, like stratovolcanoes. Hazards Hazardous ash Little has been studied about the implications of volcanic ash from eruptions within the Antarctic Circle. It is likely that an eruption at lower latitudes would cause global health and aviation hazards due to ash disbursement. The clockwise air circulation around the low pressure system at the South Pole forces air upwards, hypothetically sending ash upwards towards the Stratospheric jet streams, and thus quickly dispersing it throughout the globe. Melting ice Recently, in 2017, a study found evidence of subglacial volcanic activity within the West Antarctic Ice Sheet. This activity poses a threat to the stability of the Ice Sheet, as volcanic activity leads to increased melting. This could possibly plunge the West Antarctic Ice Sheet into a positive feedback loop of rising temperatures and increased melting. Canyons There are three vast canyons that run for hundreds of kilometers, cutting through tall mountains. None of the canyons are visible at the snow-covered surface of the continent since they are buried under hundreds of meters of ice. The largest of the canyons is called Foundation Trough and is over 350 km long and 35 km wide. The Patuxent Trough is more than 300 km long and over 15 km wide, while the Offset Rift Basin is 150 km long and 30 km wide. These three troughs all lie under and cross the so-called "ice divide" - the high ice ridge that runs all the way from the South Pole out towards the coast of West Antarctica. West Antarctica West Antarctica is the smaller part of the continent, (50° – 180°W), divided into: Areas Antarctic Peninsula (55° – 75°W) Graham Land Palmer Land Queen Elizabeth Land (20°W – 80°W) Ellsworth Land (79°45' – 103°24'W) English Coast Bryan Coast Eights Coast Marie Byrd Land (103°24' – 158°W) Walgreen Coast Bakutis Coast Hobbs Coast Ruppert Coast Saunders Coast King Edward VII Land (166°E – 155°W) Shirase Coast Seas Scotia Sea (26°30' – 65°W) Weddell Sea (57°18' – 102°20'W) Bellingshausen Sea (57°18' – 102°20'W) Amundsen Sea (102°20′ – 126°W) Ice shelves Larger ice shelves are: Filchner-Ronne Ice Shelf (30° – 83°W) Larsen Ice Shelf Abbot Ice Shelf (89°35' – 103°W) Getz Ice Shelf (114°30' – 136°W) Sulzberger Ice Shelf Ross Ice Shelf (166°E – 155°W) For all ice shelves see List of Antarctic ice shelves. Islands For a list of all Antarctic islands see List of Antarctic and sub-Antarctic islands. East Antarctica East Antarctica is the larger part of the continent, (50°W – 180°E), both the South Magnetic Pole and geographic South Pole are situated

of the fuel making this an option for some expeditions/projects. A second expedition led by Andrew Regan and Andrew Moon departed in November 2010. The Moon-Regan Trans Antarctic Expedition this time traversed the entire continent twice, using two six-wheel-drive vehicles and a Concept Ice Vehicle designed by Lotus. This time the team used the expedition to raise awareness about the global environmental importance of the Antarctic region and to show that biofuel can be a viable and environmentally friendly option. Water transport Antarctica's only harbour is at McMurdo Station. Most coastal stations have offshore anchorages, and supplies are transferred from ship to shore by small boats, barges, and helicopters. A few stations have a basic wharf facility. All ships at port are subject to inspection in accordance with Article 7, Antarctic Treaty. Offshore anchorage is sparse and intermittent, but poses no problem to sailboats designed for the ice, typically with lifting keels and long shorelines. McMurdo Station (), Palmer Station (); government use only except by permit (see Permit Office under "Legal System"). A number of tour boats, ranging from large motorized vessels to small sailing yachts, visit the Antarctic Peninsula during the summer months (January–March). Most are based in Ushuaia, Argentina. Air transport Transport in Antarctica takes place by air, using fixed-wing aircraft and helicopters. Runways and helicopter pads have to be kept snow-free to ensure safe take off and landing conditions. Antarctica has 20 airports, but there are no developed public-access airports or landing facilities. Thirty stations, operated by 16 national governments party to the Antarctic Treaty, have landing facilities for either helicopters and/or fixed-wing aircraft; commercial enterprises operate two additional air facilities. Helicopter pads are available at 27 stations; runways at 15 locations are gravel, sea-ice, blue-ice, or compacted snow suitable for landing wheeled, fixed-wing aircraft; of these, one is greater than 3 km in length, six are between 2 km and 3 km in length, 3 are between 1 km and 2 km in length, three are less than 1 km in length, and two are of unknown length; snow surface skiways, limited to use by ski-equipped, fixed-wing aircraft, are available at another 15 locations; of these, four are greater than 3 km in length, three are between 2 km and 3 km in length, two are between 1 km and 2 km in length, two are less than 1 km in length, and data is unavailable for the remaining four. Antarctic airports are subject to severe restrictions and limitations resulting from extreme seasonal and geographic conditions; they do not meet ICAO standards, and advance approval from the respective governmental or nongovernmental operating organization is required for landing (1999 est.) Flights to the continent in the permanent darkness of the winter are normally only undertaken in an emergency, with burning barrels of fuel to outline a runway. On September 11, 2008, a United States Air Force C-17 Globemaster III successfully completed the first landing in Antarctica using night-vision goggles at Pegasus Field. In April 2001 an emergency evacuation of Dr. Ronald Shemenski was needed from Amundsen–Scott South Pole Station when he contracted pancreatitis. Three C-130 Hercules were called back before their final leg because of weather.

a basic wharf facility. All ships at port are subject to inspection in accordance with Article 7, Antarctic Treaty. Offshore anchorage is sparse and intermittent, but poses no problem to sailboats designed for the ice, typically with lifting keels and long shorelines. McMurdo Station (), Palmer Station (); government use only except by permit (see Permit Office under "Legal System"). A number of tour boats, ranging from large motorized vessels to small sailing yachts, visit the Antarctic Peninsula during the summer months (January–March). Most are based in Ushuaia, Argentina. Air transport Transport in Antarctica takes place by air, using fixed-wing aircraft and helicopters. Runways and helicopter pads have to be kept snow-free to ensure safe take off and landing conditions. Antarctica has 20 airports, but there are no developed public-access airports or landing facilities. Thirty stations, operated by 16 national governments party to the Antarctic Treaty, have landing facilities for either helicopters and/or fixed-wing aircraft; commercial enterprises operate two additional air facilities. Helicopter pads are available at 27 stations; runways at 15 locations are gravel, sea-ice, blue-ice, or compacted snow suitable for landing wheeled, fixed-wing aircraft; of these, one is greater than 3 km in length, six are between 2 km and 3 km in length, 3 are between 1 km and 2 km in length, three are less than 1 km in length, and two are of unknown length; snow surface skiways, limited to use by ski-equipped, fixed-wing aircraft, are available at another 15 locations; of these, four are greater than 3 km in length, three are between 2 km and 3 km in length, two are between 1 km and 2 km in length, two are less than 1 km in length, and data is unavailable for the remaining four. Antarctic airports are subject to severe restrictions and limitations resulting from extreme seasonal and geographic conditions; they do not meet ICAO standards, and advance approval from the respective governmental or nongovernmental operating organization is required for landing (1999 est.) Flights to the continent in the permanent darkness of the winter are normally only undertaken in an emergency, with burning barrels of fuel to outline a runway. On September 11, 2008, a United States Air Force C-17 Globemaster III successfully completed the first landing in Antarctica using night-vision goggles at Pegasus Field. In April 2001 an emergency evacuation of Dr. Ronald Shemenski was needed from Amundsen–Scott South Pole Station when he contracted pancreatitis. Three C-130 Hercules were called back before their final leg because of weather. Organizers then called on Kenn Borek Air based in Calgary, Alberta. Two de Havilland Twin Otters were dispatched out of Calgary with one being back-up. Twin Otters are specifically designed for the Canadian north and Kenn Borek Air's motto is "Anywhere, Anytime, World-Wide". The mission was a success but not without difficulties and drawbacks. Ground crews needed to create a 2 km runway with tracked equipment not designed to operate in the low temperatures at that time of year, the aircraft controls had to be "jerry-rigged" when the flaps were frozen in position after landing, and instruments were not reliable because of the cold. When they saw a "faint pink line on the

or above the sea. Adjoining the Cumberland Plateau region on the southeast is the Appalachian Valley (locally known as Coosa Valley) region, which is the southern extremity of the Appalachian Mountains, and occupies an area within the state of about . This is a limestone belt with parallel hard rock ridges left standing by erosion to form mountains. Although the general direction of the mountains, ridges, and valleys is northeast and southwest, irregularity is one of the most prominent characteristics. In the northeast are several flat-topped mountains, of which Raccoon and Lookout are the most prominent, having a maximum elevation near the Georgia line of little more than and gradually decreasing in height toward the southwest, where Sand Mountain is a continuation of Raccoon. South of these the mountains are marked by steep northwest sides, sharp crests and gently sloping southeast sides. Southeast of the Appalachian Valley region, the Piedmont Plateau also crosses the Alabama border from the N.E. and occupies a small triangular-shaped section of which Randolph and Clay counties, together with the northern part of Tallapoosa and Chambers, form the principal portion. Its surface is gently undulating and has an elevation of about above sea level. The Piedmont Plateau is a lowland worn down by erosion on hard crystalline rocks, then uplifted to form a plateau. The remainder of the state is occupied by the Coastal Plain. This is crossed by foothills and rolling prairies in the central part of the state, where it has a mean elevation of about , becomes lower and more level toward the southwest, and in the extreme south is flat and but slightly elevated above the sea. The Cumberland Plateau region is drained to the west-northwest by the Tennessee River and its tributaries; all other parts of the state are drained to the southwest. In the Appalachian Valley region the Coosa River is the principal river; and in the Piedmont Plateau, the Tallapoosa River. In the Coastal Plain are the Tombigbee River in the west, the Alabama River (formed by the Coosa and Tallapoosa) in the western central, and in the east the Chattahoochee River, which forms almost half of the Georgia boundary. The Tombigbee and Alabama rivers unite near the southwest corner of the state, their waters discharging into Mobile Bay by the Mobile and Tensas rivers. The Black Warrior River is a considerable stream which joins the Tombigbee from the east. The valleys in the north and northeast are usually deep and narrow, but in the Coastal Plain they are broad and in most cases rise in three successive terraces above the stream. The harbour of Mobile was formed by the drowning of the lower part of the valley of the Alabama and Tombigbee rivers as a result of the sinking of the land here, such sinking having occurred on other parts of the Gulf coast. Flora and fauna The fauna and flora of Alabama are similar to those of the Gulf states in general and have no distinctive characteristics. However, the Mobile River system has a high incidence of endemism among freshwater mollusks and biodiversity is high. In Alabama, vast forests of pine constitute the largest proportion of the state's forest growth. There is also an abundance of cypress, hickory, oak, populus, and eastern redcedar trees. In other areas, hemlock growths in the north and southern white cedar in the southwest. Other native trees include ash, hackberry, and holly. In the Gulf region of the state grow various species of palmetto and palm. In Alabama there are more than 150 shrubs, including mountain laurel and rhododendron. Among cultivated plants are wisteria and camellia. While in the past the state enjoyed a variety of mammals such as plains bison, eastern elk, North American cougar, bear, and deer, only the white-tailed deer remains abundant. Still fairly common are the bobcat, American beaver, muskrat, raccoon, Virginia opossum, rabbit, squirrel, red and gray foxes, and long-tailed weasel. Coypu and nine-banded armadillo have been introduced to the state and now also common. Alabama's birds include golden and bald eagles, osprey and other hawks, yellow-shafted flickers, and black-and-white warblers. Game birds include bobwhite quail, duck, wild turkey, and goose. Freshwater fish such as bream, shad, bass, and sucker are common. Along the Gulf Coast there are seasonal runs of tarpon, pompano, red drum, and bonito. The U.S. Fish and Wildlife Service lists as endangered 99 animals, fish, and birds, and 18 plant species. The endangered animals include the Alabama beach mouse, gray bat, Alabama red-bellied turtle, fin and humpback whales, bald eagle, and wood stork. American black bear, racking horse, yellow-shafted flicker, wild turkey, Atlantic tarpon, largemouth bass, southern longleaf pine, eastern tiger swallowtail, monarch butterfly, Alabama red-bellied turtle, Red Hills salamander, camellia, oak-leaf hydrangea, peach, pecan, and blackberry are

for the winter ; and at Valley Head, in De Kalb county, the annual mean is , the mean for the summer , and for the winter . At Montgomery, in the central region, the average annual temperature is , with a winter average of , and a summer average of . The average winter minimum for the entire state is , and there is an average of 35 days in each year in which the thermometer falls below the freezing-point. At extremely rare intervals the thermometer has fallen below zero (-18 °C), as was the case in the remarkable cold wave of the 12th-13 February 1899, when an absolute minimum of was registered at Valley Head. The highest temperature ever recorded was in Talladega county in 1902. The amount of precipitation is greatest along the coast (62 inches/1,574 mm) and evenly distributed through the rest of the state (about 52 inches/1,320 mm). During each winter there is usually one fall of snow in the south and two in the north; but the snow quickly disappears, and sometimes, during an entire winter, the ground is not covered with snow. Heavy snowfall can occur, such as during the New Year's Eve 1963 snowstorm and the 1993 Storm of the Century. Hailstorms occur occasionally in the spring and summer, but are seldom destructive. Heavy fogs are rare, and are confined chiefly to the coast. Thunderstorms occur throughout the year - they are most common in the summer, but most severe in the spring and fall, when destructive winds and tornadoes occasionally occur. The prevailing winds are from the news. Hurricanes are quite common in the state, especially in the southern part, and major hurricanes occasionally strike the coast which can be very destructive. As regards its soil, Alabama may be divided into four regions. Extending from the Gulf northward for about is the outer belt of the Coastal Plain, also called the Timber Belt, whose soil is sandy and poor, but responds well to fertilization. North of this is the inner lowland of the Coastal Plain, or the Black Prairie, which includes some and seventeen counties. It receives its name from its soil (weathered from the weak underlying limestone), which is black in colour, almost destitute of sand and loam, and rich in limestone and marl formations, especially adapted to the production of cotton; hence the region is also called the Cotton Belt. Between the Cotton Belt and the Tennessee Valley is the mineral region, the Old Land area—a region of resistant rocks—whose soils, also derived from weathering in silu, are of varied fertility, the best coming from the granites, sandstones and limestones, the poorest from the gneisses, schists and slates. North of the mineral region is the Cereal Belt, embracing the Tennessee Valley and the counties beyond, whose richest soils are the red clays and dark loams of the river valley; north of which are less fertile soils, produced by siliceous and sandstone formations. Wetumpka Meteor Crater Wetumpka is the home of "Alabama's greatest natural disaster." A -wide meteorite hit the area about 80 million years ago. The

Ivey, who took office on April 10, 2017 following Governor Robert J. Bentley's court-mandated resignation following a guilty plea-deal amidst a corruption scandal. She is the second female governor of Alabama. Governors Governor of the Territory of Alabama Alabama Territory was formed on March 3, 1817, from Mississippi Territory. It had only one governor appointed by the President of the United States before it became a state; he became the first state governor. Governors of the State of Alabama Alabama was admitted to the Union on December 14, 1819. It seceded from the Union on January 11, 1861, and was a founding member of the Confederate States of America on February 4, 1861. Following the end of the American Civil War, Alabama during Reconstruction was part of the Third Military District, which exerted some control over governor appointments and elections. Alabama was readmitted to the Union on July 14, 1868. The first Alabama Constitution, ratified in 1819, provided that a governor be elected every two years, limited to serve no more than 4 out of every 6 years. This limit remained in place until the constitution of 1868, which simply allowed governors to serve terms of two years. The current constitution of 1901 increased terms to four years, but prohibited

Territory. It had only one governor appointed by the President of the United States before it became a state; he became the first state governor. Governors of the State of Alabama Alabama was admitted to the Union on December 14, 1819. It seceded from the Union on January 11, 1861, and was a founding member of the Confederate States of America on February 4, 1861. Following the end of the American Civil War, Alabama during Reconstruction was part of the Third Military District, which exerted some control over governor appointments and elections. Alabama was readmitted to the Union on July 14, 1868. The first Alabama Constitution, ratified in 1819, provided that a governor be elected every two years, limited to serve no more than 4 out of every 6 years. This limit remained in place until the constitution of 1868, which simply allowed governors to serve terms of two years. The current constitution of 1901 increased terms to four years, but prohibited governors from succeeding themselves. Amendment 282 to the constitution, passed in 1968, allowed governors to succeed themselves once; a governor serving two consecutive terms can run again

to have maintained an earlier and smaller number of texts as canonical, preferring to hold to only what was written in the Law of Moses (the Torah), making most of the presently accepted canon, both Jewish and Christian, apocryphal in their eyes. Others believe that it is often mistakenly asserted that the Sadducees only accepted the Pentateuch (Torah). The Essenes in Judea and the Therapeutae in Egypt were said to have a secret literature (see Dead Sea scrolls). Other traditions maintained different customs regarding canonicity. The Ethiopian Jews, for instance, seem to have retained a spread of canonical texts similar to the Ethiopian Orthodox Christians. Christianity Intertestamental books During the Apostolic Age many Jewish texts of Hellenistic origin existed within Judaism and were frequently used by Christians. Patristic authorities frequently recognized these books as important to the emergence of Christianity, but the inspired authority and value of the apocrypha remained widely disputed. Christians included several of these books in the canons of the Christian Bibles, calling them the "apocrypha" or the "hidden books". In the sixteenth century, during the Protestant Reformation, the canonical validity of the intertestamental books was challenged and fourteen books were classed in 80 book Protestant Bibles as an intertestamental section called the Apocrypha, which straddles the Old Testament and New Testament. Prior to 1629, all English-language Protestant Bibles included the Old Testament, Apocrypha, and New Testament; examples include the "Matthew's Bible (1537), the Great Bible (1539), the Geneva Bible (1560), the Bishop's Bible (1568), and the King James Bible (1611)". Fourteen out of eighty biblical books comprise the Protestant Apocrypha, first published as such in Luther's Bible (1534). Many of these texts are considered canonical Old Testament books by the Catholic Church, affirmed by the Council of Rome (AD 382) and later reaffirmed by the Council of Trent (1545–63); all of the books of the Protestant Apocrypha are considered canonical by the Eastern Orthodox Church and are referred to as anagignoskomena per the Synod of Jerusalem (1672). To this date, scripture readings from the Apocrypha are included in the lectionaries of the Lutheran Churches and the Anglican Churches. Anabaptists use the Luther Bible, which contains the intertestamental books; Amish wedding ceremonies include "the retelling of the marriage of Tobias and Sarah in the Apocrypha". The Anglican Communion accepts the Protestant Apocrypha "for instruction in life and manners, but not for the establishment of doctrine (Article VI in the Thirty-Nine Articles)", and many "lectionary readings in The Book of Common Prayer are taken from the Apocrypha", with these lessons being "read in the same ways as those from the Old Testament". The first Methodist liturgical book, The Sunday Service of the Methodists, employs verses from the Apocrypha, such as in the Eucharistic liturgy. The Protestant Apocrypha contains three books (1 Esdras, 2 Esdras and the Prayer of Manasseh) that are accepted by many Eastern Orthodox Churches and Oriental Orthodox Churches as canonical, but are regarded as non-canonical by the Catholic Church and are therefore not included in modern Catholic Bibles. In the 1800s, the British and Foreign Bible Society did not regularly publish the intertestamental section in its Bibles, citing the cost of printing the Apocrypha in addition to the Old Testament and New Testament as a major factor; this legacy came to characterize English-language Bibles in Great Britain and the Americas, unlike in Europe where Protestant Bibles are printed with 80 books in three sections: the Old Testament, Apocrypha, and New Testament. In the present-day, "English Bibles with the Apocrypha are becoming more popular again", usually being printed as intertestamental books. The Revised Common Lectionary, in use by most mainline Protestants including Methodists and Moravians, lists readings from the Apocrypha in the liturgical calendar, although alternate Old Testament scripture lessons are provided. The status of the deuterocanonicals remains unchanged in Catholic and Orthodox Christianity, though there is a difference in number of these books between these two branches of Christianity. Some authorities began using term deuterocanonical to refer to this traditional intertestamental collection as books of "the second canon". These books are often seen as helping to explain the theological and cultural transitions which took place between the Old and New Testaments. They are also sometimes called "intertestamental" by religious groups who do not recognize Hellenistic Judaism as belonging with either Jewish or Christian testaments. Slightly varying collections of apocryphal, deuterocanonical or intertestamental books of the Bible form part of the Catholic, Eastern Orthodox and Oriental Orthodox canons. The deuterocanonical or intertestamental books of the Catholic Church include Tobit, Judith, Baruch, Sirach, 1 Maccabees, 2 Maccabees, Wisdom and additions to Esther, Daniel, and Baruch. The Book of Enoch is included in the biblical canon of the Oriental Orthodox churches of Ethiopia and Eritrea. The Epistle of Jude alludes to a story in the book of Enoch, and some believe the use of this book also appears in the four gospels and 1 Peter. However, while Jesus and his disciples quoted books of the Apocrypha, the Book of Enoch was never referenced by Jesus. The genuineness and inspiration of Enoch were believed in by the writer of the Epistle of Barnabas, Irenaeus, Tertullian and Clement of Alexandria and much of the early church. The epistles of Paul and the gospels also show influences from the Book of Jubilees, which is part of the Ethiopian canon, as well as the Assumption of Moses and the Testaments of the Twelve Patriarchs, which are included in no biblical canon. Canonicity The establishment of a largely settled uniform canon was a process of centuries, and what the term canon (as well as apocrypha) precisely meant also saw development. The canonical process took place with believers recognizing writings as being inspired by God from known or accepted origins, subsequently being followed by official affirmation of what had become largely established through the study and debate of the writings. The first ecclesiastical decree on the Catholic Church’s canonical books of the Sacred Scriptures is attributed to the Council of Rome (382), and is corespondent to that of Trent. Martin Luther, like Jerome, favored the Masoretic canon for the Old Testament, excluding apocryphal books in the Luther Bible as unworthy to be properly called scripture, but included most of them in a separate section. Luther did not include the deuterocanonical books in his Old Testament, terming them "Apocrypha, that are books which are not considered equal to the Holy Scriptures, but are useful and good to read." The Eastern Orthodox Church accepts a few more books than appear in the Catholic canon. Disputes The status of the books which the Catholic Church terms Deuterocanonicals (second canon) and Protestantism refers to as Apocrypha has been an issue of disagreement which preceded the Reformation. Many believe that the pre-Christian-era Jewish translation (into Greek) of holy scriptures known as the Septuagint, a Greek translation of the Hebrew Scriptures originally compiled around 280 BC, originally included the apocryphal writings in dispute, with little distinction made between them and the rest of the Old Testament. Others argue that the Septuagint of the first century did not contain these books but they were added later by Christians. The earliest extant manuscripts of the Septuagint are from the fourth century, and suffer greatly from a lack of uniformity as regards containing apocryphal books, and some also contain books classed as pseudepigrapha, from which texts were cited by some early writers in the second and later centuries as being scripture. While a few scholars conclude that the Jewish canon was the achievement of the Hasmonean dynasty, it is generally considered not to have been finalized until about 100 AD or somewhat later, at which time considerations of Greek language and beginnings of Christian acceptance of the Septuagint weighed against some of the texts. Some were not accepted by the Jews as part of the Hebrew Bible canon and the Apocrypha is not part of the historical Jewish canon. Early church fathers such as Athanasius, Melito, Origen, and Cyril of Jerusalem, spoke against the canonicity of much or all of the apocrypha, but the most weighty opposition was the fourth century Catholic scholar Jerome who preferred the Hebrew canon, whereas Augustine and others preferred the wider (Greek) canon, with both having followers in the generations that followed. The Catholic Encyclopedia states as regards the Middle Ages, The prevailing attitude of Western medieval authors is substantially that of the Greek Fathers. The wider Christian canon accepted by Augustine became the more established canon in the western Church after being promulgated for use in the Easter Letter of Athanasius (circa 372 A.D.), the Synod of Rome (382 A.D., but its Decretum Gelasianum is generally considered to be a much later addition ) and the local councils of Carthage and Hippo in north Africa (391 and 393 A.D). Athanasius called canonical all books of the Hebrew Bible including Baruch, while excluding Esther. He adds that "there are certain books which the Fathers had appointed to be read to catechumens for edification and instruction; these are the Wisdom of Solomon, the Wisdom of Sirach (Ecclesiasticus), Esther, Judith, Tobias, the Didache, or Doctrine of the Apostles, and the Shepherd of Hermas. All others are apocrypha and the inventions of heretics (Festal Epistle for 367)". Nevertheless, none of these constituted indisputable definitions, and significant scholarly doubts and disagreements about the nature of the Apocrypha continued for centuries and even into Trent, which provided the first infallible definition of the Catholic canon in 1546. This canon came to see appropriately 1,000 years of nearly uniform use by the majority, even after the 11th-century schism that separated the church into the

as meaning simply "obscurity of origin", implying that any book of unknown authorship or questionable authenticity would be considered apocryphal. Jerome in Prologus Galeatus declared that all books outside the Hebrew canon were apocryphal. In practice, Jerome treated some books outside the Hebrew canon as if they were canonical, and the Western Church did not accept Jerome's definition of apocrypha, instead retaining the word's prior meaning. As a result, various church authorities labeled different books as apocrypha, treating them with varying levels of regard. Origen stated that "the canonical books, as the Hebrews have handed them down, are twenty-two". Clement and others cited some apocryphal books as "scripture," "divine scripture," "inspired," and the like. Teachers connected with Palestine and familiar with the Hebrew canon (the protocanon) excluded from the canon all of the Old Testament not found there. This view is reflected in the canon of Melito of Sardis, and in the prefaces and letters of Jerome. A third view was that the books were not as valuable as the canonical scriptures of the Hebrew collection, but were of value for moral uses, as introductory texts for new converts from paganism, and to be read in congregations. They were referred to as "ecclesiastical" works by Rufinus. In 1546, the Catholic Council of Trent reconfirmed the canon of Augustine, dating to the second and third centuries, declaring "He is also to be anathema who does not receive these entire books, with all their parts, as they have been accustomed to be read in the Catholic Church, and are found in the ancient editions of the Latin Vulgate, as sacred and canonical." The whole of the books in question, with the exception of 1 Esdras and 2 Esdras and the Prayer of Manasseh, were declared canonical at Trent. The Protestants, in comparison, were diverse in their opinion of the deuterocanon early on. Some considered them divinely inspired, others rejected them. Lutherans and Anglicans retained the books as Christian intertestamental readings and a part of the Bible (in a section called "Apocrypha"), but no doctrine should be based on them. John Wycliffe, a 14th-century Christian Humanist, had declared in his biblical translation that "whatever book is in the Old Testament besides these twenty-five shall be set among the apocrypha, that is, without authority or belief." Nevertheless, his translation of the Bible included the apocrypha and the Epistle of the Laodiceans. Martin Luther did not class apocryphal books as being scripture, but in the German Luther Bible (1534) the apocrypha are published in a separate section from the other books, although the Lutheran and Anglican lists are different. Anabaptists use the Luther Bible, which contains the intertestamental books; Amish wedding ceremonies include "the retelling of the marriage of Tobias and Sarah in the Apocrypha". The fathers of Anabaptism, such as Menno Simmons, quoted "them [the Apocrypha] with the same authority and nearly the same frequency as books of the Hebrew Bible" and the texts regarding the martyrodms under Antiochus IV in 1 Maccabees and 2 Maccabees are held in high esteem by the Anabaptists, who faced persecution in their history. In Reformed editions (like the Westminster), readers were warned that these books were not "to be any otherwise approved or made use of than other human writings". A milder distinction was expressed elsewhere, such as in the "argument" introducing them in the Geneva Bible, and in the Sixth Article of the Church of England, where it is said that "the other books the church doth read for example of life and instruction of manners," though not to establish doctrine. Among some Nonconformists, the term apocryphal began to take on extra or altered connotations: not just of dubious authenticity, but having spurious or false content, Protestants, being diverse in theological views, were (and are) not unanimous in adopting those meanings. Generally, Anabaptists and magisterial Protestants recognize the fourteen books of the Apocrypha as being non-canonical, but useful for reading "for example of life and instruction of manners": a view that continues today throughout the Lutheran Church, the worldwide Anglican Communion, among many other denominations, such as the Methodist Churches and Quaker Yearly Meetings. Liturgically, the Catholic, Methodist and Anglican churches have a scripture reading from the Book of Tobit in services of Holy Matrimony. According to the Orthodox Anglican Church: Though Protestant Bibles historically include 80 books, 66 of these form the Protestant canon (such as listed in the Westminster Confession of 1646), which has been well established for centuries, with many today supporting the use of the Apocrypha and others contending against the Apocrypha using various arguments. Metaphorical usage The adjective apocryphal is commonly used in modern English to refer to any text or story considered to be of dubious veracity or authority, although it may contain some moral truth. In this broader metaphorical sense, the word suggests a claim that is in the nature of folklore, factoid or urban legend. Buddhism Apocryphal Jatakas of the Pāli Canon, such as those belonging to the Paññāsajātaka collection, have been adapted to fit local culture in certain Southeast Asian countries and have been retold with amendments to the plots to better reflect Buddhist morals. Within the Pali tradition, the apocryphal Jatakas of later composition (some dated even to the 19th century) are treated as a separate category of literature from the "official" Jataka stories that have been more-or-less formally canonized from at least the 5th century—as attested to in ample epigraphic and archaeological evidence, such as extant illustrations in bas relief from ancient temple walls. Judaism The Jewish apocrypha, known in Hebrew as הספרים החיצונים (Sefarim Hachizonim: "the outer books"), are books written in large part by Jews, especially during the Second Temple period, not accepted as sacred manuscripts when the Hebrew Bible was canonized. Some of these books are considered sacred by some Christians, and are included in their versions of the Old Testament. The Jewish apocrypha is distinctive from the New Testament apocrypha and biblical apocrypha as it is the only one of these collections which works within a Jewish theological framework. Although Orthodox Jews believe in the exclusive canonization of the current 24 books in the Hebrew Bible, they also consider the Oral Torah, which they believe was handed down from Moses, to be authoritative. Some argue that the Sadducees, unlike the Pharisees but like the Samaritans, seem to have maintained an earlier and smaller number of texts as canonical, preferring to hold to only what was written in the Law of Moses (the Torah), making most of the presently accepted canon, both Jewish and Christian, apocryphal in their eyes. Others believe that it is often mistakenly asserted that the Sadducees only accepted the Pentateuch (Torah). The Essenes in Judea and the Therapeutae in Egypt were said to have a secret literature (see Dead Sea scrolls). Other traditions maintained different customs regarding canonicity. The Ethiopian Jews, for instance, seem to have retained a spread of canonical texts similar to the Ethiopian Orthodox Christians. Christianity Intertestamental books During the Apostolic Age many Jewish texts of Hellenistic origin existed within Judaism and were frequently used by Christians. Patristic authorities frequently recognized these books as important to the emergence of Christianity, but the inspired authority and value of the apocrypha remained widely disputed. Christians included several of these books in the canons of the Christian Bibles, calling them the "apocrypha" or the "hidden books". In the sixteenth century, during the Protestant Reformation, the canonical validity of the intertestamental books was challenged and fourteen books were classed in 80 book Protestant Bibles as an intertestamental section called the Apocrypha, which straddles the Old Testament and New Testament. Prior to 1629, all English-language Protestant Bibles included the Old Testament, Apocrypha, and New Testament; examples include the "Matthew's Bible (1537), the Great Bible (1539), the Geneva Bible (1560), the Bishop's Bible (1568), and the King James Bible (1611)". Fourteen out of eighty biblical books comprise the Protestant Apocrypha, first published as such in Luther's Bible (1534). Many of these texts are considered canonical Old Testament books by the Catholic Church, affirmed by the Council of Rome (AD 382) and later reaffirmed by the Council of Trent (1545–63); all of the books of the Protestant Apocrypha are considered canonical by the Eastern Orthodox Church and are referred to as anagignoskomena per the Synod of Jerusalem (1672). To this date, scripture readings from the Apocrypha are included in the lectionaries of the Lutheran Churches and the Anglican Churches. Anabaptists use the Luther Bible, which contains the intertestamental books; Amish wedding ceremonies include "the retelling of the marriage of Tobias and Sarah in the Apocrypha". The Anglican Communion accepts the Protestant Apocrypha "for instruction in life and manners, but not for the establishment of doctrine (Article VI in the Thirty-Nine Articles)", and many "lectionary readings in The Book of Common Prayer are taken from the Apocrypha", with these lessons being "read in the same ways as those from the Old Testament". The first Methodist liturgical book, The Sunday Service of the Methodists, employs verses from the Apocrypha, such as in the Eucharistic liturgy. The Protestant Apocrypha contains three books (1 Esdras, 2 Esdras and the Prayer of Manasseh) that are accepted by many Eastern Orthodox Churches and Oriental Orthodox Churches as canonical, but are regarded as non-canonical by the Catholic Church and are therefore not included in modern Catholic Bibles. In the 1800s, the British and Foreign Bible Society did not regularly publish the intertestamental section in its Bibles, citing the cost of printing the Apocrypha in addition to the Old Testament and New Testament as a major factor; this legacy came to characterize English-language Bibles in Great Britain and the Americas, unlike in Europe where Protestant Bibles are printed with 80 books in three sections: the Old Testament, Apocrypha, and New Testament. In the present-day, "English Bibles with the Apocrypha are becoming more popular again", usually being printed as intertestamental books. The Revised Common Lectionary, in use by most mainline Protestants including Methodists and Moravians, lists readings from the Apocrypha in the liturgical calendar, although alternate Old Testament scripture lessons are provided. The status of the deuterocanonicals remains unchanged in Catholic and Orthodox Christianity, though there is a

entered into force on June 23, 1961. The original signatories were the 12 countries active in Antarctica during the International Geophysical Year (IGY) of 1957–58: Argentina, Australia, Belgium, Chile, France, Japan, New Zealand, Norway, South Africa, the Soviet Union, the United Kingdom, and the United States. These countries had established over 55 Antarctic research stations for the IGY, and the subsequent promulgation of the treaty was seen as a diplomatic expression of the operational and scientific cooperation that had been achieved. As of 2019, the treaty has 54 parties. History International conflicts Various international conflicts motivated the creation of an agreement for the Antarctic. After the Second World War, the U.S. considered establishing a claim in Antarctica. From August 26, 1946, and until the beginning of 1947, Operation Highjump was carried out, the largest military expeditionary force that the United States has sent to Antarctica to the present, consisting of 13 ships, 4700 men and numerous aerial devices. Its goals were to train military personnel and test material in conditions of extreme cold for a hypothetical war in the Antarctic. Some incidents had occurred during World War II, and a new one occurred in Hope Bay on February 1, 1952, when the Argentine military fired warning shots at a group of Britons. The response of the United Kingdom was to send a warship that landed marines at the scene on February 4. In 1949, Argentina, Chile, and the United Kingdom signed a Tripartite Naval Declaration committing not to send warships south of the 60th South parallel, which was renewed annually until 1961 when it was deemed unnecessary when the treaty entered into force. This tripartite declaration was signed after the tension generated when Argentina sent a fleet of 8 warships to Antarctica in February 1948. On January 17, 1953, Argentina reopened the Lieutenant Lasala refuge on Deception Island, leaving a sergeant and a corporal in the Argentine Navy. On February 15, in the incident on Deception Island, 32 royal marines landed from the British frigate HMS Snipe armed with Sten machine guns, rifles, and tear gas capturing the two Argentine sailors. The Argentine refuge and a nearby uninhabited Chilean shelter were destroyed, and the Argentine sailors were delivered to a ship from that country on February 18 in the South Georgias Islands. A British detachment remained three months on the island while the frigate patrolled its waters until April. On May 4, 1955, the United Kingdom filed two lawsuits, against Argentina and Chile respectively, before the International Court of Justice to declare the invalidity of the claims of the sovereignty of the two countries over Antarctic and sub-Antarctic areas. On July 15, 1955, the Chilean Government rejected the jurisdiction of the Court in that case, and on August 1, the Argentine Government also did so, so on March 16, 1956, the claims were filed. Previous agreements On September 2, 1947, the American quadrant of Antarctica (between 24 ° W and 90 ° W) was included as part of the security zone of the Inter-American Treaty of Reciprocal Assistance, committing its members to defend it in case of external aggression. In August 1948, the United States proposed that Antarctica be under the guardianship of the United Nations as a trust administered by Argentina, Australia, Chile, France, the United States, the United Kingdom, and New Zealand. Still, the idea was rejected by Argentina, Australia, Chile, France, and Norway. Before the rejection, on August 28, 1948, the United States proposed to the claimants some form of internationalization of Antarctica, with the support of the United Kingdom. Chile responded by presenting a plan to suspend any Antarctic claim for 5 to 10 years while negotiating a final solution, which did not prosper. The interest of the United States to keep the Soviet Union away from Antarctica was frustrated when in 1950, this country informed the claimants that it would not accept any Antarctic agreement in which it was not represented. The fear that the USSR would react by making a territorial claim, bringing the Cold War to Antarctica, led the United States to make none. In 1956 and 1958, India tried unsuccessfully to bring the Antarctic issue to the United Nations General Assembly. International Geophysical Year In 1950 the International Council of Scientific Unions (ICSU) discussed the possibility of holding a third International Polar Year. At the suggestion of the World Meteorological Organization, the idea of the International Polar Year was extended to the entire planet, thus creating the International Geophysical Year that took place between July 1, 1957, and December 31, 1958. In this event, 66 countries participated. At the ICSU meeting in Stockholm from September 9 to 11, 1957, the creation of a Special Committee for Antarctic Research (SCAR) was approved, inviting the twelve countries conducting Antarctic investigations to send delegates to integrate the committee, with the purpose of exchanging scientific information among its members regarding Antarctica. The SCAR was later renamed to the Scientific Committee for Research in Antarctica. Both Argentina and Chile expressed that researching during the International Geophysical Year would not give any territorial rights to the participants and that the facilities that were erected during that year should then be dismantled at the end of it. After the United States proposed to extend the Antarctic investigations for another year, in February 1958, the Soviet Union reported that it would maintain its scientific bases until the studies that were carried out were completed. Negotiation of the treaty Scientific bases increased in international tension concerning Antarctica, and the danger of the Cold War spreading to that continent, caused the President of the United States, Dwight D. Eisenhower, to convene an Antarctic Conference to the twelve countries active in Antarctica during the International Geophysical Year, to sign a treaty. In the first phase, representatives of the twelve nations met in Washington, who met in 60 sessions from June 1958 to October 1959, to define the basic negotiating framework. Still, no consensus was reached on a preliminary draft. In the second phase, a conference of the highest diplomatic level was held from October 15 to December 1, 1959, the date of the signing of the treaty. The central ideas with full acceptance were the freedom of scientific research in Antarctica and the peaceful use of the continent. Still, their demilitarization

in that case, and on August 1, the Argentine Government also did so, so on March 16, 1956, the claims were filed. Previous agreements On September 2, 1947, the American quadrant of Antarctica (between 24 ° W and 90 ° W) was included as part of the security zone of the Inter-American Treaty of Reciprocal Assistance, committing its members to defend it in case of external aggression. In August 1948, the United States proposed that Antarctica be under the guardianship of the United Nations as a trust administered by Argentina, Australia, Chile, France, the United States, the United Kingdom, and New Zealand. Still, the idea was rejected by Argentina, Australia, Chile, France, and Norway. Before the rejection, on August 28, 1948, the United States proposed to the claimants some form of internationalization of Antarctica, with the support of the United Kingdom. Chile responded by presenting a plan to suspend any Antarctic claim for 5 to 10 years while negotiating a final solution, which did not prosper. The interest of the United States to keep the Soviet Union away from Antarctica was frustrated when in 1950, this country informed the claimants that it would not accept any Antarctic agreement in which it was not represented. The fear that the USSR would react by making a territorial claim, bringing the Cold War to Antarctica, led the United States to make none. In 1956 and 1958, India tried unsuccessfully to bring the Antarctic issue to the United Nations General Assembly. International Geophysical Year In 1950 the International Council of Scientific Unions (ICSU) discussed the possibility of holding a third International Polar Year. At the suggestion of the World Meteorological Organization, the idea of the International Polar Year was extended to the entire planet, thus creating the International Geophysical Year that took place between July 1, 1957, and December 31, 1958. In this event, 66 countries participated. At the ICSU meeting in Stockholm from September 9 to 11, 1957, the creation of a Special Committee for Antarctic Research (SCAR) was approved, inviting the twelve countries conducting Antarctic investigations to send delegates to integrate the committee, with the purpose of exchanging scientific information among its members regarding Antarctica. The SCAR was later renamed to the Scientific Committee for Research in Antarctica. Both Argentina and Chile expressed that researching during the International Geophysical Year would not give any territorial rights to the participants and that the facilities that were erected during that year should then be dismantled at the end of it. After the United States proposed to extend the Antarctic investigations for another year, in February 1958, the Soviet Union reported that it would maintain its scientific bases until the studies that were carried out were completed. Negotiation of the treaty Scientific bases increased in international tension concerning Antarctica, and the danger of the Cold War spreading to that continent, caused the President of the United States, Dwight D. Eisenhower, to convene an Antarctic Conference to the twelve countries active in Antarctica during the International Geophysical Year, to sign a treaty. In the first phase, representatives of the twelve nations met in Washington, who met in 60 sessions from June 1958 to October 1959, to define the basic negotiating framework. Still, no consensus was reached on a preliminary draft. In the second phase, a conference of the highest diplomatic level was held from October 15 to December 1, 1959, the date of the signing of the treaty. The central ideas with full acceptance were the freedom of scientific research in Antarctica and the peaceful use of the continent. Still, their demilitarization and the maintenance of the status quo also had consensus. The positions of the United States, the Soviet Union, the United Kingdom, and New Zealand coincided in the establishment of an international administration for Antarctica, proposing the latter to be within the framework of the United Nations. Australia and the United Kingdom expressed the need for inspections by observers, and the second proposed the use of military means for logistics functions. Argentina proposed that all atomic explosions be banned in Antarctica, which caused a crisis that lasted until the eve of the firm, since the United States, along with other countries, intended to ban only those that were made without prior notice and without prior consultation. The support of the USSR and Chile to the Argentine proposal finally caused the United States to retract its opposition. The signing of the treaty was the first arms control agreement that occurred in the framework of the Cold War, and the complaining countries managed to avoid the internationalization of Antarctic sovereignty. Other agreements Other agreements – some 200 recommendations adopted at treaty consultative meetings and ratified by governments – include: Agreed Measures for the Conservation of Antarctic Fauna and Flora (1964) (entered into force in 1982) The Convention for the Conservation of Antarctic Seals (1972) The Convention for the Conservation of Antarctic Marine Living Resources (1982) The Convention on the Regulation of Antarctic Mineral Resource Activities (1988) (signed in 1988, not in force) The Protocol on Environmental Protection to the Antarctic Treaty was signed October 4, 1991, and entered into force January 14, 1998; this agreement prevents development and provides for the protection of the Antarctic environment through five specific annexes on marine pollution, fauna and flora, environmental impact assessments, waste management, and protected areas. It prohibits all activities relating to mineral resources except scientific. A sixth annex on liability arising from environmental emergencies was adopted in 2005, but is yet to enter into force. Bilateral treaties Exchange of Notes constituting an Agreement between the Governments of Australia, New Zealand and the United Kingdom of Great Britain and Northern Ireland, and the Government of the French Republic, regarding Aerial Navigation in the Antarctic (Paris, October 25, 1938) Treaty Between the Government of Australia and the Government of the French Republic on Cooperation in the Maritime Areas Adjacent to the French Southern and Antarctic Territories (TAAF), Heard Island and the McDonald Islands (Canberra, November 24, 2003) Agreement on Cooperative Enforcement of Fisheries Laws between the Government of Australia and the Government of the French Republic in the Maritime Areas Adjacent to the French Southern and Antarctic Territories, Heard Island and the McDonald Islands (Paris, January 8, 2007) Meetings The Antarctic Treaty System's yearly Antarctic Treaty Consultative Meetings (ATCM) are the international forum for the administration and management of the region. Only 29 of the 54 parties to the agreements have the right to participate in decision-making at these meetings, though the other 25 are still allowed to attend. The decision-making participants are the Consultative Parties and, in addition to the 12 original signatories, including 17 countries that have demonstrated their interest in Antarctica by carrying out substantial scientific activity there. The Antarctic Treaty also has Special Antarctic Treaty Consultative Meetings (SATCM), which are generally summoned to treat more important topics but are less frequents and Meetings of Experts. Parties As of 2019, there are 54 states party to the treaty, 29 of which, including all 12 original signatories to the treaty, have consultative (voting) status. The consultative members include the 7 countries that claim portions of Antarctica as their territory. The 47 non-claimant countries either do not recognize the claims of others, or have not stated their positions. 40 parties to the Antarctic Treaty have also ratified the "Protocol on Environmental Protection to the Antarctic Treaty". * Has an overlapping claim with another one or two claimants. † Reserved the right to make a claim. Antarctic Treaty Secretariat The Antarctic Treaty Secretariat was established in Buenos Aires, Argentina in September 2004 by the Antarctic Treaty Consultative Meeting (ATCM). Jan Huber (the Netherlands) served as the first Executive Secretary for five years until August 31, 2009. He was succeeded on September 1, 2009, by

have found the secret of living to 200. He also developed his own highly unusual theories of physics, according to which such concepts as "penetrability", "suction and pressure" and "zig-zag-and-swirl" were discoveries on par with Einstein's theory of relativity. He published numerous books on these concepts, all set in a distinctive typography. He later propounded his own philosophy, Lawsonomy, and the Lawsonian religion. He also developed, during the Great Depression, the populist economic theory of "Direct Credits", according to which banks are the cause of all economic woes, the oppressors of both capital and labour. Lawson believed that the government should replace banks as the provider of loans to business and workers. He predicted the worldwide adoption of Lawsonian principles once "everybody understands this subject". His rallies and lectures attracted thousands of listeners in the early 1930s, mainly in the upper Midwest, but by the late 1930s the crowds had dwindled. His claims about his own greatness became increasingly hyperbolic. The Lawsonomy trilogy, considered by Lawson himself to be his intellectual masterpiece, is full of such self-referential statements as "About every two thousand years a new teacher with advanced intellectual equipment appears upon earth to lead the people a step or two nearer the one God of everybody". In 1943, he founded the Humanity Benefactor Foundation and University of Lawsonomy in Des Moines, on the site of Des Moines University, to spread his teachings and offer the degree of "Knowledgian", but after various IRS and other investigations it was closed and finally sold in 1954, the year of Lawson's death. His financial arrangements remain mysterious to this day, and in later years he seems to have owned little property, moving from city to city as a guest of his farflung acolytes. In 1952, he was brought before a United States Senate investigative committee on allegations that his organization had bought war surplus machines and then sold them for a profit, despite claiming non-profit status. His attempt to explain Lawsonomy to the senators ended in mutual frustration and bafflement. A farm near Racine, Wisconsin, is the only remaining university facility, although a tiny handful of churches may yet survive in places such as Wichita, Kansas. The large sign, formerly reading "University of Lawsonomy", was a familiar landmark for motorists in the region for many years and was visible from Interstate 94 about north of the Illinois state line, on the east side of the highway. A storm in the spring of 2009 destroyed the sign, although the supporting posts are still visible. On the northbound side of

advocated for a strong American flying force, lobbying Congress in 1913 to expand its appropriations for Army aircraft. In early 1913, he learned to fly the Sloan-Deperdussin and the Moisant-Bleriot monoplanes, becoming an accomplished pilot. Later that year he bought a Thomas flying boat and became the first air commuter regularly flying from his country house in Seidler's Beach, New Jersey, to the foot of 75th Street in New York City (about 35 miles). In 1917, utilizing the knowledge gained from ten years of advocating aviation, he built his first airplane, the Lawson Military Tractor 1 (MT-1) trainer, and founded the Lawson Aircraft Corporation. The company's plant was sited at Green Bay, Wisconsin. There he secured a contract and built the Lawson MT-2. He also designed the steel fuselage Lawson Armored Battler, which never got beyond the drafting board, given doubts within the Army aviation community and the signing of the armistice. After the war, in 1919 Lawson started a project to build America's first airline. He secured financial backing, and in five months he had built and demonstrated in flight his biplane airliner, the 18-passenger Lawson L-2. He demonstrated its capabilities in a 2000-mile multi-city tour from Milwaukee to Chicago-Toledo-Cleveland-Buffalo-Syracuse-New york City-Washington, D.C.-Collinsville-Dayton-Chicago and back to Milwaukee, creating a buzz of positive press. The publicity allowed him to secure an additional $1 million to build the 26-passenger Midnight Liner. The aircraft crashed on takeoff on its maiden flight. In late 1920, he secured government contracts for three airmail routes and to deliver ten war planes, but owing to the fall 1920 recession, he could not secure the necessary $100,000 in cash reserves called for in the contracts and had to decline them. In 1926, he started his last airliner, the 56-seat, two-tier Lawson super airliner. In this phase of his life, he was considered one of the leading thinkers in the budding American commercial aviation community, but his troubles with getting financial backing for his ideas led him to turn to economics, philosophy, and organization. Lawsonomy (1929–1954) In the 1920s, Lawson promoted health practices, including vegetarianism, and claimed to have found the secret of living to 200. He also developed his own highly unusual theories of physics, according to which such concepts as "penetrability", "suction and pressure" and "zig-zag-and-swirl" were discoveries on par with Einstein's theory of relativity. He published numerous books on these concepts, all set in a distinctive typography. He later propounded his own philosophy, Lawsonomy, and the Lawsonian religion. He also developed, during the Great Depression, the populist economic theory of "Direct Credits", according to which banks are the cause of all economic woes, the oppressors of both capital and labour. Lawson believed that the government should replace banks as the provider of loans to business and workers. He predicted the worldwide adoption of Lawsonian principles once "everybody understands this subject". His rallies and lectures attracted thousands of listeners in the early 1930s, mainly in the upper Midwest, but by the late 1930s the crowds had dwindled. His claims about his own greatness became increasingly hyperbolic. The Lawsonomy trilogy, considered by Lawson himself to be his intellectual masterpiece, is full of such self-referential statements as "About every two thousand years a new

households were made up of individuals, and 6.2% had someone living alone who was 65 years of age or older. The average household size was 2.25 and the average family size was 2.82. The median age in the city was 23.8 years. 13.4% of residents were under the age of 18; 40.5% were between the ages of 18 and 24; 22.9% were from 25 to 44; 15% were from 45 to 64; and 8.1% were 65 years of age or older. The gender makeup of the city was 53.0% male and 47.0% female. 2000 census As of the census of 2000, there were 50,731 people, 18,085 households, and 8,970 families residing in the city. The population density was 2,352.3 people per square mile (908.1/km2). There were 18,757 housing units at an average density of 869.7 per square mile (335.7/km2). The racial makeup of the city was 87.34% White, 7.70% Asian, 2.65% African American, 0.04% Native American, 0.76% Pacific Islander and other races, and 1.36% from two or more races. Hispanic or Latino of any race were 1.98% of the population. There were 18,085 households, out of which 22.3% had children under the age of 18 living with them, 42.0% were married couples living together, 5.3% had a female householder with no husband present, and 50.4% were non-families. 28.5% of all households were made up of individuals, and 5.9% had someone living alone who was 65 years of age or older. The average household size was 2.30 and the average family size was 2.85. Age spread: 14.6% under the age of 18, 40.0% from 18 to 24, 23.7% from 25 to 44, 13.9% from 45 to 64, and 7.7% who were 65 years of age or older. The median age was 24 years. For every 100 females, there were 109.3 males. For every 100 females age 18 and over, there were 109.9 males. The median income for a household in the city was $36,042, and the median income for a family was $56,439. Males had a median income of $37,877 versus $28,198 for females. The per capita income for the city was $18,881. About 7.6% of families and 20.4% of the population were below the poverty line, including 9.2% of those under age 18 and 4.1% of those age 65 or over. Metropolitan area The U.S. Census Bureau designates the Ames MSA as encompassing all of Story County. While Ames is the largest city in Story County, the county seat is in the nearby city of Nevada, east of Ames. Ames metropolitan statistical area combined with the Boone, Iowa micropolitan statistical area (Boone County, Iowa) make up the larger Ames-Boone combined statistical area. Ames is the larger principal city of the Combined Statistical Area that includes all of Story County, Iowa and Boone County, Iowa. which had a combined population of 106,205 at the 2000 census. Economy Ames is home of Iowa State University of Science and Technology, a public land-grant and space-grant research university, and member of the prestigious Association of American Universities. At its founding in 1858, Iowa State was formerly known as the Iowa State College of Agriculture and Mechanic Arts. Ames is the home of the closely allied U.S. Department of Agriculture's National Animal Disease Center (See Ames strain), the U.S. Department of Energy's Ames Laboratory (a major materials research and development facility), and the main offices of the Iowa Department of Transportation. State and Federal institutions are the largest employers in Ames. Other area employers include a 3M manufacturing plant; Danfoss Power Solutions, a hydraulics manufacturer; Barilla, a pasta manufacturer; Ball, a manufacturer of canning jars and plastic bottles; Workiva, a global cloud computing company; Renewable Energy Group, America's largest producer of biomass-based diesel; and the National Farmers Organization. The Iowa State University Research Park is a not-for-profit, business development incubator located in Ames, and affiliated with Iowa State University. In 2015, Ames was ranked in the top 15 "Cities That Have Done the Best Since the Recession" by Bloomberg Businessweek. The Bureau of Labor Statistics ranked Ames and Boulder, CO as having the lowest unemployment rate (2.5%) of any metropolitan area in the US in 2016. By June 2018, unemployment in Ames had fallen even further, to 1.5%, and wage increases for workers were not keeping pace with rising rents. Top employers According to Ames's 2020 Comprehensive Annual Financial Report, the top employers in the city are: Arts and culture Velma Wallace Rayness Ames, Iowa was home to Gerard M. and Velma Wallace Rayness. Both artists taught art and were nationally recognized artists. Their art was exhibited nationally as well as abroad. Gerard died in the 1940s. Velma Wallace Rayness died in 1977. Velma Wallace Rayness usually signed her paintings "V.W. Rayness". Ames Historical Society Collects, preserves, and provides access to evidence of the history of Ames and its immediate vicinity from pre-settlement times to the present. Brunnier Art Museum (Scheman Building) Ames Public Library The Ames Public Library is a Carnegie library founded on October 20, 1904. It currently has 1,386,273 items in circulations, including 799,349 books and 586,924 multimedia items. The Octagon Center for the Arts The Center includes galleries, art classes, art studios, and retail shop. They sponsor the local street fair, The Octagon Arts Festival. Also have the Annual National Juried Exhibition Clay, Fiber, Paper Glass Metal, Wood. The Space for Ames Formally known as the Ames Progressive, The Space for Ames was a community space that served as an art gallery, music venue and classroom for community workshops. Popular culture The city is featured in the bestselling book The Girls from Ames written by Wall Street Journal columnist Jeffrey Zaslow. It examines the lives and friendships of several young girls who grew up in Ames and have moved on with their adult lives but still remain close. The city was featured in the episode "Heartache" of the television show Supernatural. The character "Kate Austen" from the television show Lost is from Ames. Sports Iowa Sports Foundation The Iowa State Cyclones play a variety of sports in the Ames area. The Iowa State Cyclones football team plays at Jack Trice Stadium in Ames. Also, the Cyclones' Men's and Women's Basketball teams and Volleyball teams play at Hilton Coliseum just across the street from Jack Trice Stadium. The Iowa State Cyclones are a charter member of the Big 12 Conference in all sports and compete in NCAA Division I-A. The Iowa State Women's Tennis is also well known and very successful. The Ames Figure Skating Club provides recreational to professional level skating opportunities. The club sponsors the Learn to Skate Program. Coaches provide on and off ice lessons or workshops. The club hosts the figure skating portion of the Iowa Games competition every summer. In the fall the club hosts Cyclone Country Championships. The Ames ISU ice arena also hosts the Iowa State Cyclones hockey team. The arena also hosts the Ames Little Cyclones hockey program for high school students and children in elementary or middle school. Education Much of the city is served by the Ames Community School District. A portion of northern Ames is zoned to the Gilbert Community School District. Public high school in Ames Ames High School: Grades 9–12 Public elementary/middle schools in Ames David Edwards Elementary: K-5 Abbie Sawyer Elementary School: Grades K-5 Kate Mitchell Elementary School: Grades K-5 Warren H. Meeker Elementary School: Grades K-5 Gertrude Fellows Elementary School: Grades K-5 Ames Middle School: Grades 6–8 Gilbert CSD students are zoned to Gilbert High School. Private schools in Ames Ames Christian School Saint Cecilia School (preK – 5th grade) Iowa State University Iowa State University of Science and Technology, more commonly known as Iowa State University (ISU), is a public land-grant and space-grant research university located in Ames. Iowa State University is the birthplace of the Atanasoff–Berry Computer, the world's first electronic digital computer. Iowa State has produced a number of astronauts, scientists, Nobel laureates, and Pulitzer Prize winners. Until 1945 it was known as the Iowa State College of Agriculture and Mechanic Arts. The university is a member of the American Association of Universities and the Big 12 Conference. ISU is the nation's first designated land-grant university In 1856, the Iowa General Assembly enacted legislation to establish the State Agricultural College and Model Farm. Story County was chosen as the location on June 21, 1859, from proposals by Johnson, Kossuth, Marshall, Polk, and Story counties. When Iowa accepted the provisions of the Morrill Act of 1862, Iowa State became the first institution in nation designated as a land-grant college. The institution was coeducational from the first preparatory class admitted in 1868. The formal admitting of students began the following year, and the first graduating class of 1872 consisted of 24 men and 2 women. The first building on the Iowa State campus was Farm House. Built in the 1860s, it currently serves as a museum and National Historic Landmark. Today, Iowa State has over 60 notable buildings, including Beardshear Hall, Morrill Hall, Memorial Union, Catt Hall, Curtiss Hall, Carver Hall, Parks Library, the Campanile, Hilton Coliseum, C.Y. Stephens Auditorium, Fisher Theater, Jack Trice Stadium, Lied Recreation Center, numerous residence halls, and many buildings specific to ISU's many different majors and colleges. The official mascot for ISU is Cy the Cardinal. The

White, 7.70% Asian, 2.65% African American, 0.04% Native American, 0.76% Pacific Islander and other races, and 1.36% from two or more races. Hispanic or Latino of any race were 1.98% of the population. There were 18,085 households, out of which 22.3% had children under the age of 18 living with them, 42.0% were married couples living together, 5.3% had a female householder with no husband present, and 50.4% were non-families. 28.5% of all households were made up of individuals, and 5.9% had someone living alone who was 65 years of age or older. The average household size was 2.30 and the average family size was 2.85. Age spread: 14.6% under the age of 18, 40.0% from 18 to 24, 23.7% from 25 to 44, 13.9% from 45 to 64, and 7.7% who were 65 years of age or older. The median age was 24 years. For every 100 females, there were 109.3 males. For every 100 females age 18 and over, there were 109.9 males. The median income for a household in the city was $36,042, and the median income for a family was $56,439. Males had a median income of $37,877 versus $28,198 for females. The per capita income for the city was $18,881. About 7.6% of families and 20.4% of the population were below the poverty line, including 9.2% of those under age 18 and 4.1% of those age 65 or over. Metropolitan area The U.S. Census Bureau designates the Ames MSA as encompassing all of Story County. While Ames is the largest city in Story County, the county seat is in the nearby city of Nevada, east of Ames. Ames metropolitan statistical area combined with the Boone, Iowa micropolitan statistical area (Boone County, Iowa) make up the larger Ames-Boone combined statistical area. Ames is the larger principal city of the Combined Statistical Area that includes all of Story County, Iowa and Boone County, Iowa. which had a combined population of 106,205 at the 2000 census. Economy Ames is home of Iowa State University of Science and Technology, a public land-grant and space-grant research university, and member of the prestigious Association of American Universities. At its founding in 1858, Iowa State was formerly known as the Iowa State College of Agriculture and Mechanic Arts. Ames is the home of the closely allied U.S. Department of Agriculture's National Animal Disease Center (See Ames strain), the U.S. Department of Energy's Ames Laboratory (a major materials research and development facility), and the main offices of the Iowa Department of Transportation. State and Federal institutions are the largest employers in Ames. Other area employers include a 3M manufacturing plant; Danfoss Power Solutions, a hydraulics manufacturer; Barilla, a pasta manufacturer; Ball, a manufacturer of canning jars and plastic bottles; Workiva, a global cloud computing company; Renewable Energy Group, America's largest producer of biomass-based diesel; and the National Farmers Organization. The Iowa State University Research Park is a not-for-profit, business development incubator located in Ames, and affiliated with Iowa State University. In 2015, Ames was ranked in the top 15 "Cities That Have Done the Best Since the Recession" by Bloomberg Businessweek. The Bureau of Labor Statistics ranked Ames and Boulder, CO as having the lowest unemployment rate (2.5%) of any metropolitan area in the US in 2016. By June 2018, unemployment in Ames had fallen even further, to 1.5%, and wage increases for workers were not keeping pace with rising rents. Top employers According to Ames's 2020 Comprehensive Annual Financial Report, the top employers in the city are: Arts and culture Velma Wallace Rayness Ames, Iowa was home to Gerard M. and Velma Wallace Rayness. Both artists taught art and were nationally recognized artists. Their art was exhibited nationally as well as abroad. Gerard died in the 1940s. Velma Wallace Rayness died in 1977. Velma Wallace Rayness usually signed her paintings "V.W. Rayness". Ames Historical Society Collects, preserves, and provides access to evidence of the history of Ames and its immediate vicinity from pre-settlement times to the present. Brunnier Art Museum (Scheman Building) Ames Public Library The Ames Public Library is a Carnegie library founded on October 20, 1904. It currently has 1,386,273 items in circulations, including 799,349 books and 586,924 multimedia items. The Octagon Center for the Arts The Center includes galleries, art classes, art studios, and retail shop. They sponsor the local street fair, The Octagon Arts Festival. Also have the Annual National Juried Exhibition Clay, Fiber, Paper Glass Metal, Wood. The Space for Ames Formally known as the Ames Progressive, The Space for Ames was a community space that served as an art gallery, music venue and classroom for community workshops. Popular culture The city is featured in the bestselling book The Girls from Ames written by Wall Street Journal columnist Jeffrey Zaslow. It examines the lives and friendships of several young girls who grew up in Ames and have moved on with their adult lives but still remain close. The city was featured in the episode "Heartache" of the television show Supernatural. The character "Kate Austen" from the television show Lost is from Ames. Sports Iowa Sports Foundation The Iowa State Cyclones play a variety of sports in the Ames area. The Iowa State Cyclones football team plays at Jack Trice Stadium in Ames. Also, the Cyclones' Men's and Women's Basketball teams and Volleyball teams play at Hilton Coliseum just across the street from Jack Trice Stadium. The Iowa State Cyclones are a charter member of the Big 12 Conference in all sports and compete in NCAA Division I-A. The Iowa State Women's Tennis is also well known and very successful. The Ames Figure Skating Club provides recreational to professional level skating opportunities. The club sponsors the Learn to Skate Program. Coaches provide on and off ice lessons or workshops. The club hosts the figure skating portion of the Iowa Games competition every summer. In the fall the club hosts Cyclone Country Championships. The Ames ISU ice arena also hosts the Iowa State Cyclones hockey team. The arena also hosts the Ames Little Cyclones hockey program for high school students and children in elementary or middle school. Education Much of the city is served by the Ames Community School District. A portion of northern Ames is zoned to the Gilbert Community School District. Public high school in Ames Ames High School: Grades 9–12 Public elementary/middle schools in Ames David Edwards Elementary: K-5 Abbie Sawyer Elementary School: Grades K-5 Kate Mitchell Elementary School: Grades K-5 Warren H. Meeker Elementary School: Grades K-5 Gertrude Fellows Elementary School: Grades K-5 Ames Middle School: Grades 6–8 Gilbert CSD students are zoned to Gilbert High School. Private schools in Ames Ames Christian School Saint Cecilia School (preK – 5th grade) Iowa State University Iowa State University of Science and Technology, more commonly known as Iowa State University (ISU), is a public land-grant and space-grant research university located in Ames. Iowa State University is the birthplace of the Atanasoff–Berry Computer, the world's first electronic digital computer. Iowa State has produced a number of astronauts, scientists, Nobel laureates, and Pulitzer Prize winners. Until 1945 it was known as the Iowa State College of Agriculture and Mechanic Arts. The university is a member of the American Association of Universities and the Big 12 Conference. ISU is the nation's first designated land-grant university In 1856, the Iowa General Assembly enacted legislation to establish the State Agricultural College and Model Farm. Story County was chosen as the location on June 21, 1859, from proposals by Johnson, Kossuth, Marshall, Polk, and Story counties. When Iowa accepted the provisions of the Morrill Act of 1862, Iowa State became the first institution in nation designated as a land-grant college. The institution was coeducational from the first preparatory class admitted in 1868. The formal admitting of students began the following year, and the first graduating class of 1872 consisted of 24 men and 2 women. The first building on the Iowa State campus was Farm House. Built in the 1860s, it currently serves as a museum and National Historic Landmark. Today, Iowa State has over 60 notable buildings, including Beardshear Hall, Morrill Hall, Memorial Union, Catt Hall, Curtiss Hall, Carver Hall, Parks Library, the Campanile, Hilton Coliseum, C.Y. Stephens Auditorium, Fisher Theater, Jack Trice Stadium, Lied Recreation Center, numerous residence halls, and many buildings specific to ISU's many different majors and colleges. The official mascot for ISU is Cy the Cardinal. The official school colors are cardinal and gold. The Iowa State Cyclones play in the NCAA's Division I-A as a member of the Big 12 Conference. Media Online and newsprint Ames Tribune, Tuesday-Sunday paper produced in Ames. Iowa State Daily, independent student newspaper produced at Iowa State University. The Des Moines Register also provides extensive coverage of Iowa news and sports to Ames. Story County Sun, weekly newspaper that covers the entire county published in Ames. Radio stations licensed to Ames KURE, student radio operated at Iowa State University. WOI-FM, Iowa Public Radio's flagship "Studio One" station, broadcasting an NPR news format during the day and a music format in the evening, owned and operated at Iowa State University. WOI (AM), Iowa Public Radio's flagship station delivering a 24-hour news format consisting mainly of NPR programming, owned and operated at Iowa State University. KOEZ, Adult Contemporary station licensed to Ames, but operated in Des Moines. KCYZ, Hot Adult Contemporary station owned and operated by Clear Channel in Ames. KASI, news/talk station owned and operated by Clear Channel in Ames. KNWM-FM, Contemporary Christian Madrid/Ames station owned and operated by the University of Northwestern – St. Paul - simulcast with KNWI-FM Osceola/Des Moines KHOI, Community Radio station licensed to Story City with studios in Ames. KHOI broadcasts music and local public affairs programs and is affiliated with the Pacifica Radio network. Ames is also served by stations in the Des Moines media market, which includes Clear Channel's 50,000-watt talk station WHO, music stations KAZR, KDRB, KGGO, KKDM, KHKI, KIOA, KJJY, KRNT, KSPZ and KSTZ, talk station KWQW, and sports stations KXNO and KXNO-FM. Television Like radio, Ames is served

a typical number of open holes, between four and 10, in the selenizone. An abalone has no operculum. The aperture of the shell is very wide and nacreous. The exterior of the shell is striated and dull. The color of the shell is very variable from species to species, which may reflect the animal's diet. The iridescent nacre that lines the inside of the shell varies in color from silvery white, to pink, red and green-red to deep blue, green to purple. The animal has fimbriated head lobes and side lobes that are fimbriated and cirrated. The radula has small median teeth, and the lateral teeth are single and beam-like. They have about 70 uncini, with denticulated hooks, the first four very large. The rounded foot is very large in comparison to most molluscs. The soft body is coiled around the columellar muscle, and its insertion, instead of being on the columella, is on the middle of the inner wall of the shell. The gills are symmetrical and both well developed. These snails cling solidly with their broad, muscular foot to rocky surfaces at sublittoral depths, although some species such as Haliotis cracherodii used to be common in the intertidal zone. Abalones reach maturity at a relatively small size. Their fecundity is high and increases with their size, laying from 10,000 to 11 million eggs at a time. The spermatozoa are filiform and pointed at one end, and the anterior end is a rounded head. The adults provide no further assistance to the larvae and they are described as lecithotrophic. The adults are herbivorous and feed with their rhipidoglossan radula on macroalgae, preferring red or brown algae. Distribution The haliotid family has a worldwide distribution, along the coastal waters of every continent, except the Pacific coast of South America, the Atlantic coast of North America, the Arctic, and Antarctica. The majority of abalone species are found in cold waters, such as off the coasts of New Zealand, South Africa, Australia, Western North America, and Japan. Structure and properties of the shell The shell of the abalone is exceptionally strong and is made of microscopic calcium carbonate tiles stacked like bricks. Between the layers of tiles is a clingy protein substance. When the abalone shell is struck, the tiles slide instead of shattering and the protein stretches to absorb the energy of the blow. Material scientists around the world are studying this tiled structure for insight into stronger ceramic products such as body armor. The dust created by grinding and cutting abalone shell is dangerous; appropriate safeguards must be taken to protect people from inhaling these particles. Diseases and pests Abalones are subject to various diseases. The Victorian Department of Primary Industries said in 2007 that ganglioneuritis killed up to 90% of stock in affected regions. Abalone are also severe hemophiliacs as their fluids will not clot in the case of a laceration or puncture wound. Members of the Spionidae of the polychaetes are known as pests of abalone. Human use Abalone has been harvested worldwide for centuries as a source of food and decorative items. Abalone shells and associated materials, like their claw-like pearls and nacre, have been used as jewelry and for buttons, buckles, and inlay. These shells have been found in archaeological sites around the world, ranging from 100,000-year-old deposits at Blombos Cave in South Africa to historic Chinese abalone middens on California's Northern Channel Islands. For at least 12,000 years. abalones were harvested to such an extent around the Channel Islands that shells in the area decreased in size four thousand years ago. Farming Farming of abalone began in the late 1950s and early 1960s in Japan and China. Since the mid-1990s, there have been many increasingly successful endeavors to commercially farm abalone for the purpose of consumption. Overfishing and poaching have reduced wild populations to such an extent that farmed abalone now supplies most of the abalone meat consumed. The principal abalone farming regions are China, Taiwan, Japan, and Korea. Abalone is also farmed in Australia, Canada, Chile, France, Iceland, Ireland, Mexico, Namibia, New Zealand, South Africa, Spain, Thailand, and the United States. After trials in 2012, a commercial "sea ranch" was set up in Flinders Bay, Western Australia to raise abalone. The ranch is based on an artificial reef made up of 5000 () separate concrete units called abitats (abalone habitats). The habitats can host 400 abalone each. The reef is seeded with young abalone from an onshore hatchery. The abalone feed on seaweed that has grown naturally on the habitats; with the ecosystem enrichment of the bay also resulting in growing numbers of dhufish, pink snapper, wrasse, Samson fish among other species. Brad Adams, from the company, has emphasised the similarity to wild abalone and the difference from shore-based aquaculture. "We're not aquaculture, we're ranching, because once they're in the water they look after themselves." Consumption Abalones have long been a valuable food source for humans in every area of the world where a species is abundant. The meat of this mollusc is considered a delicacy in certain parts of Latin America (particularly Chile), France, New Zealand, East Asia and Southeast Asia. In the Greater China region and among Overseas Chinese communities, abalone is commonly known as bao yu, and sometimes forms part of a Chinese banquet. In the same way as shark fin soup or bird's nest soup, abalone is considered a luxury item, and is traditionally reserved for special occasions such as weddings and other celebrations. As abalone became more popular and less common, the prices adjusted accordingly. In the 1920s, a restaurant-served portion of abalone, about 4 ounces, would cost (in inflation adjusted dollars) about

growing numbers of dhufish, pink snapper, wrasse, Samson fish among other species. Brad Adams, from the company, has emphasised the similarity to wild abalone and the difference from shore-based aquaculture. "We're not aquaculture, we're ranching, because once they're in the water they look after themselves." Consumption Abalones have long been a valuable food source for humans in every area of the world where a species is abundant. The meat of this mollusc is considered a delicacy in certain parts of Latin America (particularly Chile), France, New Zealand, East Asia and Southeast Asia. In the Greater China region and among Overseas Chinese communities, abalone is commonly known as bao yu, and sometimes forms part of a Chinese banquet. In the same way as shark fin soup or bird's nest soup, abalone is considered a luxury item, and is traditionally reserved for special occasions such as weddings and other celebrations. As abalone became more popular and less common, the prices adjusted accordingly. In the 1920s, a restaurant-served portion of abalone, about 4 ounces, would cost (in inflation adjusted dollars) about US$7; by 2004, the price had risen to US$75. In the United States, prior to this time, abalone was predominantly eaten, gathered, and prepared by Chinese immigrants. Before that, abalone were collected to be eaten, and used for other purposes by Native American tribes. By 1900, laws were passed in California to outlaw the taking of abalone above the intertidal zone. This forced the Chinese out of the market and the Japanese perfected diving, with or without gear, to enter the market. Abalone started to become popular in the USA after the Panama–Pacific International Exposition in 1915, which exhibited 365 varieties of fish with cooking demonstrations, and a 1300-seat dining hall. In Japan, live and raw abalones are used in awabi sushi, or served steamed, salted, boiled, chopped, or simmered in soy sauce. Salted, fermented abalone entrails are the main component of tottsuru, a local dish from Honshū. Tottsuru is mainly enjoyed with sake. In California, abalone meat can be found on pizza, sautéed with caramelized mango, or in steak form dusted with cracker meal and flour. Sport harvesting Australia Tasmania supplies about 25% of the yearly world abalone harvest. Around 12,500 Tasmanians recreationally fish for blacklip and greenlip abalone. For blacklip abalone, the size limit varies between for the southern end of the state and for the northern end of the state. Greenlip abalones have a minimum size of , except for an area around Perkins Bay in the north of the state where the minimum size is . With a recreational abalone licence, the bag limit is 10 per day, with a total possession limit of 20. Scuba diving for abalone is allowed, and has a rich history in Australia. (Scuba diving for abalone in the states of New South Wales and Western Australia is illegal; a free-diving catch limit of two is allowed). Victoria has had an active abalone fishery since the late 1950s. The state is sectioned into three fishing zones, Eastern, Central and Western, with each fisher required a zone-allocated licence. Harvesting is performed by divers using surface-supplied air "hookah" systems operating from runabout-style, outboard-powered boats. While the diver seeks out colonies of abalone amongst the reef beds, the deckhand operates the boat, known as working "live" and stays above where the diver is working. Bags of abalone pried from the rocks are brought to the surface by the diver or by way of "shot line", where the deckhand drops a weighted rope for the catch bag to be connected then retrieved. Divers measure each abalone before removing from the reef and the deckhand remeasures each abalone and removes excess weed growth from the shell. Since 2002, the Victorian industry has seen a significant decline in catches, with the total allowable catch reduced from 1440 to 787 tonnes for the 2011/12 fishing year, due to dwindling stocks and most notably the abalone virus ganglioneuritis, which is fast-spreading and lethal to abalone stocks. United States Sport harvesting of red abalone is permitted with a California fishing license and an abalone stamp card. In 2008, the abalone card also came with a set of 24 tags. This was reduced to 18 abalone per year in 2014, and as of 2017 the limit has been reduced to 12, only nine of which may be taken south of Mendocino County. Legal-size abalone must be tagged immediately. Abalone may only be taken using breath-hold techniques or shorepicking; scuba diving for abalone is strictly prohibited. Taking of abalone is not permitted south of the mouth of San Francisco Bay. A size minimum of measured across the shell is in place. A person may be in possession of only three abalone at any given time. As of 2017, abalone season is May to October, excluding July. Transportation of abalone may only legally occur while the abalone is still attached in the shell. Sale of sport-obtained abalone is illegal, including the shell. Only red abalone may be taken, as black, white, pink, flat, green, and pinto abalone are protected by law. In 2018, The California Fish and Game Commission closed recreational abalone season due to dramatically declining populations. That year, they extended the moratorium to last through April 2021. An abalone diver is normally equipped with a thick wetsuit, including a hood, bootees, and gloves, and usually also a mask, snorkel, weight belt, abalone iron, and abalone gauge. Alternatively, the rock picker can feel underneath rocks at low tides for abalone. Abalone are mostly taken in depths from a few inches up to ; less common are freedivers who can work deeper than . Abalone are normally found on rocks near food sources such as kelp. An abalone iron is used to pry the abalone from the rock before it has time to fully clamp down. Divers dive from boats, kayaks, tube floats, or directly off the shore. The largest abalone recorded in California is , caught by John Pepper somewhere off the coast of San Mateo County in September 1993. The mollusc Concholepas concholepas is often sold in the United States under the name "Chilean abalone", though it is not an abalone, but a muricid. New Zealand In New Zealand, abalone is called paua (, from the Māori language). Haliotis iris (or blackfoot paua) is the ubiquitous New Zealand paua, the highly polished nacre of which is extremely popular as souvenirs with its striking blue, green, and purple iridescence. Haliotis australis and Haliotis virginea are also found in New Zealand waters, but are less popular than H. iris. Like all New Zealand shellfish, recreational harvesting of paua does not require a permit provided catch limits, size restrictions, and seasonal and local restrictions set by the Ministry for Primary Industries (MPI) are followed. The legal recreational daily limit is 10 per diver, with a minimum shell length of for H. iris and for H. australis. In addition, no person may be in possession, even on land, of more than 20 paua or more than of paua meat at any one time. Paua can only be caught by free-diving; it is illegal to catch them using scuba gear. An extensive global black market exists in collecting and exporting abalone meat. This can be a particularly awkward problem where the right to harvest paua can be granted legally under Māori customary rights. When such permits to harvest are abused, it is frequently difficult to police. The limit is strictly enforced by roving Ministry for Primary Industries fishery officers with the backing of the New Zealand Police. Poaching is a major industry in New Zealand with many thousands being taken illegally, often undersized. Convictions have resulted in seizure of diving gear, boats, and motor vehicles and fines and in rare cases, imprisonment. South Africa The largest abalone in South Africa, Haliotis midae, occurs along roughly two-thirds of the country's coastline. Abalone-diving has been a recreational activity for many years, but stocks are currently being threatened by illegal commercial harvesting. In South Africa, all persons harvesting this shellfish need permits that are issued annually, and no abalone may be harvested using scuba gear. For the last few years, however, no permits have been issued for collecting abalone, but commercial harvesting still continues as does illegal collection by syndicates. In 2007, because of widespread poaching of abalone, the South African government listed abalone as an endangered species according to the CITES section III appendix, which requests member governments to monitor the trade in this species. This listing was removed from CITES in June 2010 by the South African government and South African abalone is no longer subject to CITES trade controls. Export permits are still required, however. The abalone meat from South Africa is prohibited for sale in the country to help reduce poaching; however, much of the illegally harvested meat is sold in Asian countries. As of early 2008, the wholesale price for abalone meat was approximately US$40.00 per kilogram. There is an active trade in the shells, which sell for more than US$1,400 per tonne. Channel Islands, Brittany and Normandy Ormers (Haliotis tuberculata) are considered a delicacy in the British Channel Islands as well as in adjacent areas of France, and are pursued with great alacrity by the locals. This, and a recent lethal bacterial disease, has led to a dramatic depletion in numbers since the latter half of the 19th century, and "ormering" is now strictly regulated to preserve stocks. The gathering of ormers is now restricted to a number of 'ormering tides', from 1 January to 30 April, which occur on the full or new moon and two days following. No ormers may be taken from the beach that are under in shell length. Gatherers are not allowed to wear wetsuits or even put

due to Apostolical privilege, certain Abbesses have been granted rights and responsibilities above the normal, such as the Abbess of the Cistercian Monastery of the Abbey of Santa María la Real de Las Huelgas near Burgos, Spain. Also granted exceptional rights was the Abbess of the Cistercian order in Conversano Italy. She was granted the ability to appoint her own vicar-general, select and approve the confessors, along with the practice of receiving the public homage of her clergy. This practice continued until some of the duties were modified due to an appeal by the clergy to Rome. Finally in 1750, the public homage was abolished. During the Middle Ages (7th-10th centuries) in the Catholic Church, greater restrictions on abbesses' spiritual independence gained pace. Instruments of church authority, from papal bulls down to local sanctions, were increasingly used to restrict their freedom to dispense blessings, administer sacraments, including the veiling of nuns, and publicly read the gospels or preach. Such spiritual - and even temporal - authority had in earlier church history, largely been unremarkable. As Thomas Oestereich, contributor to the Catholic Encyclopedia (1907), makes clear, abbesses' past spiritual authority was increasingly seen as the "usurpation" of corresponding priestly power, and a solely male privilege. He gives an example of the attitude toward such practice, from the 9th century, which persists in church administrative control into the modern era: Similarly, , Innocent III (died 1216) expressed his view of the Cistercian Abbesses of Burgos and Palencia in Spain, who preached and heard confessions of their own religious, characterizing these acts as "unheard of, most indecorous, and highly preposterous." History Historically, in some Celtic monasteries, abbesses presided over joint-houses of monks and nuns, the most famous example being Saint Brigid of Kildare's leadership in the founding of the monastery at Kildare in Ireland. This custom accompanied Celtic monastic missions to France, Spain, and even to Rome itself. In 1115, Robert, the founder of Fontevraud Abbey near Chinon and Saumur, France, committed the government of the whole order, men as well as women, to a female superior. In Lutheran churches, the title of abbess () has in some cases survived (for example, in the ) to designate the heads of abbeys which since the Protestant Reformation have continued as monasteries or convents (). These positions continued, merely changing from Catholic to Lutheran. The first to make this change was the Abbey of Quedlinburg, whose last Catholic Abbess died in 1514. These are collegiate foundations, which provide a home and an income for unmarried ladies, generally of noble birth, called canonesses (), or more usually, or . The office of abbess is of considerable social dignity, and in the past, was sometimes filled by princesses of the reigning houses. Until the dissolution of Holy Roman Empire and mediatisation of smaller imperial fiefs by Napoleon, the evangelical Abbess of Quedlinburg was also per officio the head of that state. The last such ruling abbess was Sofia Albertina, Princess of Sweden. In the Hradčany of Prague is a Catholic institute whose mistress is titled an Abbess. It was founded in 1755 by the Empress Maria Theresa, and traditionally was responsible for the coronation of the Queen of Bohemia. The Abbess is required to be an Austrian Archduchess. The Catholic Church has

virgin, has undergone non-salutory public penance, is a widow, or is blind or deaf, is typically disqualified for the position, saving by permission of the Holy See. The office is elective, the choice being by the secret votes of the nuns belonging to the community. Like an abbot, after being confirmed in her office by the Holy See, an abbess is solemnly admitted to her office by a formal blessing, conferred by the bishop in whose territory the monastery is located, or by an abbot or another bishop with appropriate permission. Unlike the abbot, the abbess receives only the ring, the crosier, and a copy of the rule of the order. She does not receive a mitre as part of the ceremony. The abbess also traditionally adds a pectoral cross to the outside of her habit as a symbol of office, though she continues to wear a modified form of her religious habit or dress, as she is unordained—females cannot be ordained—and so does not vest or use choir dress in the liturgy. An abbess serves for life, except in Italy and some adjacent islands. Roles and responsibilities Abbesses are, like abbots, major superiors according to canon law, the equivalents of abbots or bishops (the ordained male members of the church hierarchy who have, by right of their own office, executive jurisdiction over a building, diocesan territory, or a communal or non-communal group of persons—juridical entities under church law). They receive the vows of the nuns of the abbey; they may admit candidates to their order's novitiate; they may send them to study; and they may send them to do pastoral or missionary, or to work or assist—to the extent allowed by canon and civil law—in the administration and ministry of a parish or diocese (these activities could be inside or outside the community's territory). They have full authority in its administration. However, there are significant limitations. They may not administer the sacraments, whose celebration is reserved to bishops, priests, deacons (clerics), namely, those in Holy Orders. They may make provision for an ordained cleric to help train and to admit some of their members, if needed, as altar servers, extraordinary ministers of Holy Communion, or lectors—all ministries which are now open to the unordained. They may not serve as a witness to a marriage except by special rescript. They may not administer Penance (Reconciliation), Anointing of the Sick (Extreme Unction), or function as an ordained celebrant or

found that mortality is three times higher in low- compared with high-HDI countries even when adjusted for prognostic factors. In this study the overall global mortality rate was 1·6 per cent at 24 hours (high 1·1 per cent, middle 1·9 per cent, low 3·4 per cent; P < 0·001), increasing to 5·4 per cent by 30 days (high 4·5 per cent, middle 6·0 per cent, low 8·6 per cent; P < 0·001). Of the 578 patients who died, 404 (69·9 per cent) did so between 24 h and 30 days following surgery (high 74·2 per cent, middle 68·8 per cent, low 60·5 per cent). Patient safety factors were suggested to play an important role, with use of the WHO Surgical Safety Checklist associated with reduced mortality at 30 days. Taking a similar approach, a unique global study of 1,409 children undergoing emergency laparotomy from 253 centres in 43 countries showed that adjusted mortality in children following surgery may be as high as 7 times greater in low-HDI and middle-HDI countries compared with high-HDI countries, translating to 40 excess deaths per 1000 procedures performed in these settings. Internationally, the most common operations performed were appendectomy, small bowel resection, pyloromyotomy and correction of intussusception. After adjustment for patient and hospital risk factors, child mortality at 30 days was significantly higher in low-HDI (adjusted OR 7.14 (95% CI 2.52 to 20.23), p<0.001) and middle-HDI (4.42 (1.44 to 13.56), p=0.009) countries compared with high-HDI

called scar tissue): Complications of postoperative adhesion formation are frequent, they have a large negative effect on patients’ health, and increase workload in clinical practice Bleeding Infection Paralytic ileus (sometimes called ileus): short-term paralysis of the bowel Perioperative mortality (death) Shock Sterile technique, aseptic post-operative care, antibiotics, use of the WHO Surgical Safety Checklist, and vigilant post-operative monitoring greatly reduce the risk of these complications. Planned surgery performed under sterile conditions is much less risky than that performed under emergency or unsterile conditions. The contents of the bowel are unsterile, and thus leakage of bowel contents, as from trauma, substantially increases the risk of infection. Globally, there are few studies comparing perioperative mortality following abdominal surgery across different health systems. One major prospective study of 10,745 adult patients undergoing emergency laparotomy from 357 centres in 58 high-, middle-, and low-income countries found that mortality is three times higher in low- compared with high-HDI countries even when adjusted for prognostic factors. In this study the overall global mortality rate was 1·6 per cent at 24 hours (high 1·1 per cent, middle 1·9 per cent, low 3·4 per cent; P < 0·001), increasing to 5·4 per cent by 30 days (high 4·5 per cent,

will Raptio, large scale abduction of women, either for marriage or enslavement Tiger kidnapping, taking a hostage to force a loved one or associate of the victim to do something Sciences Abduction (anatomy), a type of movement which draws a structure or limb away from the median plane of the body Abductive reasoning, a method of reasoning in logic Media Film and television "Abduction" (The Outer Limits), a 2001 television episode "Abduction," episode of Death Note, a Japanese animation television series "Abductions" (Totally Spies!), a 2002 episode of an animated television series "The

of the body Abductive reasoning, a method of reasoning in logic Media Film and television "Abduction" (The Outer Limits), a 2001 television episode "Abduction," episode of Death Note, a Japanese animation television series "Abductions" (Totally Spies!), a 2002 episode of an animated television series "The Abduction" (Alias), a 2002 television episode "The Abduction" (Dr. Quinn, Medicine Woman), a 1994 television episode Abduction (1975 film), directed by Joseph Zito Abduction (1997 film), directed by Takao Okawara Abduction (2011 film), directed by John Singleton Abduction (2019 film), directed by Ernie Barbarash Abduction: The Megumi Yokota Story, a 2005 American documentary film The Abduction, a 1996 TV movie starring Victoria Principal and Robert Hays Literature Abduction (novel), a 2000 novel by novelist Robin Cook Abduction!, a 2004 novel by Peg Kehret The Abduction, a 1987 novel (Norwegian title Bortførelsen), written in Norwegian by Mette Newth and translated into English

and the first major written work on the subject. He is commemorated in the Walhalla temple, a monument near Regensburg to the distinguished figures of German history. Until 1800, Abensberg was a municipality belonging to the Straubing district of the Electorate of Bavaria. Abensberg also contained a magistrates' court. In the Battle of Abensberg on 19–20 April 1809, Napoleon gained a significant victory over the Austrians under Archduke Ludwig of Austria and General Johann von Hiller. Coat of Arms The arms of the city are divided into two halves. On the left are the blue and white rhombuses of Bavaria, while the right half is split into two silver and black triangles. Two diagonally-crossed silver swords with golden handles rest on top. The town has had a coat of arms since 1338, that of the Counts of Abensberg. With the death of the last Count, Nicholas of Abensberg, in 1485, the estates fell to the Duchy of Bavaria-Munich, meaning that henceforth only the Bavarian coat of arms was ever used. On 31 December 1809, a decree of King Maximilian of Bavaria granted the city a new coat of arms, as a recognition of their (mainly humanitarian and logistic) services in the Battle of Abensberg the same year. The diagonally divided field in silver and black came from the old crest of the Counts of Abensberg, while the white and blue diamonds came from that of the House of Wittelsbach, the rulers of Bavaria. The swords recall the Battle of Abensberg. The district of Offenstetten previously possessed its own coat of arms. Twinning Parga in Greece since 1986 Lonigo in Italy since 1999 Economy and Infrastructure The area around Abensberg, the so-called sand belt between Siegburg, Neustadt an der Donau, Abensberg and Langquaid, is used for the intensive farming of asparagus, due to the optimal soil condition and climate. 212 hectares of land can produce ninety-four asparagus plants. Abensberg asparagus enjoys a reputation among connoisseurs as a particular delicacy. In addition to asparagus, the production of hops plays a major role locally, the region having its own label, and there are still three independent breweries in the area. The town of Abensberg marks the start of the Deutsche Hopfenstraße (German Hops Road), a nickname given to the Bundesstraße 301, a German federal highway which runs through the heartland of Germany's hops-growing industry, ending in Freising. Transport The Abensberg railway station is located on the Regensburg–Ingolstadt railway from Regensburg to Ingolstadt. The city can be reached via the A-93 Holledau-Regensburg road (exit Abensberg). Three Bundesstraße (German federal highways) cross south of Abensberg: B 16, B 299 and B 301. Public facilities Schools Abensberg has a Grundschule (primary school) and Hauptschule (open admission secondary school), and the Johann-Turmair-Realschule (secondary modern school). There is also a College of Agriculture and Home Economics. Since 2007, the Kelheim Berufsschule has had a campus in Abensberg, and outside the state sector is the St. Francis Vocational Training Centre, run by a Catholic youth organisation. Culture and sightseeing Theatre In 2008, a former goods shed by the main railway station of Abensberg was converted into a theatre by local volunteers. The "Theater am Bahnhof" (Theatre at the Railway Station) is mostly used by the Theatergruppe Lampenfieber and was opened on 19 October 2008. Museums Abensberg has a long tradition of museums. In the nineteenth century, Nicholas Stark und Peter Paul Dollinger began a collection based on local history. This collection and the collection of the Heimatverein (local history society) were united in 1963 into the Aventinus Museum, in the cloister of the former Carmelite monastery. On 7 July 2006, the new Town Museum of Abensberg was opened in the former duke's castle in the town. Kuchlbauer Brewery Two blocks west of the Old Town is the Kuchlbauer Brewery and beer garden featuring the Kuchlbauer Tower, a colorful and unconventional observation tower designed by Viennese architect Friedensreich Hundertwasser. The brewery and tower are open to the public. Image gallery Missing memorial Up until the 1950s, Abensberg and the surrounding villages contained a number of graves of victims of a Death March in the Spring of 1945 from the Hersbruck sub-camp of the Dachau concentration camp, who were either murdered by the SS or died of exhaustion. They were originally buried where they died, but were later moved on the orders of the US military government to the cemeteries of their previous homes. At the cemetery in what is now the district of Pullach stood a memorial stone which was mentioned as recently as 1967, but which is no longer at the site. The suffering of ten unknown victims of the camp was recorded on the stone. Regular events The Abensberger events calendar begins in February with the Faschingsgillamoos funfair, which reaches its high point on Mad Thursday. There then follows the Frühjahrsmarkt (Spring market) two weeks before Easter, when all the shops in the town are permitted to open on Sunday (which is normally prohibited in Bavaria). The Bürgerfest is celebrated on the first weekend of July, when the palace gardens with their ancient walls are transformed into a medieval camp. The Schlossgartenfest (Palace Garden Festival) takes place every year at the beginning of August. It is organised since 1977 by the Junge Union, the youth branch of Germany's two main conservative

Austria and General Johann von Hiller. Coat of Arms The arms of the city are divided into two halves. On the left are the blue and white rhombuses of Bavaria, while the right half is split into two silver and black triangles. Two diagonally-crossed silver swords with golden handles rest on top. The town has had a coat of arms since 1338, that of the Counts of Abensberg. With the death of the last Count, Nicholas of Abensberg, in 1485, the estates fell to the Duchy of Bavaria-Munich, meaning that henceforth only the Bavarian coat of arms was ever used. On 31 December 1809, a decree of King Maximilian of Bavaria granted the city a new coat of arms, as a recognition of their (mainly humanitarian and logistic) services in the Battle of Abensberg the same year. The diagonally divided field in silver and black came from the old crest of the Counts of Abensberg, while the white and blue diamonds came from that of the House of Wittelsbach, the rulers of Bavaria. The swords recall the Battle of Abensberg. The district of Offenstetten previously possessed its own coat of arms. Twinning Parga in Greece since 1986 Lonigo in Italy since 1999 Economy and Infrastructure The area around Abensberg, the so-called sand belt between Siegburg, Neustadt an der Donau, Abensberg and Langquaid, is used for the intensive farming of asparagus, due to the optimal soil condition and climate. 212 hectares of land can produce ninety-four asparagus plants. Abensberg asparagus enjoys a reputation among connoisseurs as a particular delicacy. In addition to asparagus, the production of hops plays a major role locally, the region having its own label, and there are still three independent breweries in the area. The town of Abensberg marks the start of the Deutsche Hopfenstraße (German Hops Road), a nickname given to the Bundesstraße 301, a German federal highway which runs through the heartland of Germany's hops-growing industry, ending in Freising. Transport The Abensberg railway station is located on the Regensburg–Ingolstadt railway from Regensburg to Ingolstadt. The city can be reached via the A-93 Holledau-Regensburg road (exit Abensberg). Three Bundesstraße (German federal highways) cross south of Abensberg: B 16, B 299 and B 301. Public facilities Schools Abensberg has a Grundschule (primary school) and Hauptschule (open admission secondary school), and the Johann-Turmair-Realschule (secondary modern school). There is also a College of Agriculture and Home Economics. Since 2007, the Kelheim Berufsschule has had a campus in Abensberg, and outside the state sector is the St. Francis Vocational Training Centre, run by a Catholic youth organisation. Culture and sightseeing Theatre In 2008, a former goods shed by the main railway station of Abensberg was converted into a theatre by local volunteers. The "Theater am Bahnhof" (Theatre at the Railway Station) is mostly used by the Theatergruppe Lampenfieber and was opened on 19 October 2008. Museums Abensberg has a long tradition of museums. In the nineteenth century, Nicholas Stark und Peter Paul Dollinger began a collection based on local history. This collection and the collection of the Heimatverein (local history society) were united in 1963 into the Aventinus Museum, in the cloister of the former Carmelite monastery. On 7 July 2006, the new Town Museum of Abensberg was opened in the former duke's castle in the town. Kuchlbauer Brewery Two blocks west of the Old Town is the Kuchlbauer Brewery and beer garden featuring the Kuchlbauer Tower, a colorful and unconventional observation tower designed by Viennese architect Friedensreich Hundertwasser. The brewery and tower are open to the public. Image gallery Missing memorial Up until the 1950s, Abensberg and the surrounding villages contained a number of graves of victims of a Death March in the Spring of 1945 from the Hersbruck sub-camp of the Dachau concentration camp, who were either murdered by the SS or died of exhaustion. They were originally buried where they died, but were later moved on the orders of the US military government to the cemeteries of their previous homes. At the cemetery in what is now the district of Pullach stood a memorial stone which was mentioned as recently as 1967, but which is no longer at the site. The suffering of ten unknown victims of the camp was recorded on the stone. Regular events The Abensberger events calendar begins in February with the Faschingsgillamoos funfair, which reaches its high point on Mad Thursday. There then follows the Frühjahrsmarkt (Spring market) two weeks before Easter, when all the shops in the town are permitted to open on Sunday (which is normally prohibited in Bavaria). The Bürgerfest is celebrated on the first weekend of July, when the palace gardens with their ancient walls are transformed into a medieval camp. The Schlossgartenfest (Palace Garden Festival) takes place every year at the beginning of August. It is organised since 1977 by the Junge Union, the youth branch of Germany's two main conservative political parties, the CDU and CSU, and attracts all age groups from Abensberg and surrounding areas. On the second Saturday in August, people can wander through the Night Market in the balmy Summer evening. The Gillamoos, the oldest and largest funfair in the Hallertau opens on the Thursday before the first Sunday in September and runs until the Monday thereafter. It is the highlight of the year in Abensberg and is a celebration of the people of Abensberg and the surrounding area. The Herbstmarkt (autumn market), another Sunday shopping day, is on the first weekend in October. Since 1997, a series of cultural, art, music and entertainment events have taken place in November at various locations in the town, under the title, Novembernebel (November fog) On Saint Nicholas Day (6 December), the Niklasmarkt (Nicholas Market) commemorates the Niklasspende, a medieval foundation for the poor. This heralds the beginning of Advent and the Christmas period. Notable residents Sons and daughters of the town Konrad von Abensberg (c.1075-1147): Archbishop of Salzburg and monastic

Mennonites have been historically Arminian whether they distinctly espoused the Arminian viewpoint or not, and rejected Calvinism soteriology. Anabaptist theology seems to have influenced Jacobus Arminius. At least, he was "sympathetic to the Anabaptist point of view, and Anabaptists were commonly in attendance on his preaching." Similarly, Arminius mentions Danish Lutheran theologian Niels Hemmingsen as holding the basic view of soteriology he held and he may have been influenced by Hemmingsen. Emergence of Arminianism Jacobus Arminius was a Dutch pastor and theologian in the late 16th and early 17th centuries. He was taught by Theodore Beza, Calvin's hand-picked successor, but after examination of the scriptures, he rejected his teacher's theology that it is God who unconditionally elects some for salvation. Instead Arminius proposed that the election of God was of believers, thereby making it conditional on faith. Arminius's views were challenged by the Dutch Calvinists, especially Franciscus Gomarus, but Arminius died before a national synod could occur. Arminius died before he could satisfy Holland's State General's request for a 14-page paper outlining his views. Arminius's followers replied in his stead crafting the Five articles of Remonstrance (1610), in which they express their points of divergence with the stricter Calvinism of the Belgic Confession. This is how Arminius's followers were called Remonstrants, and following a Counter Remonstrance in 1611, Gomarus' followers were called Counter-Remonstrants. After some political maneuvering, the Dutch Calvinists were able to convince Prince Maurice of Nassau to deal with the situation. Maurice systematically removed Arminian magistrates from office and called a national synod at Dordrecht. This Synod of Dort was open primarily to Dutch Calvinists (102 people), while the Arminians were excluded (13 people banned from voting), with Calvinist representatives from other countries (28 people), and in 1618 published a condemnation of Arminius and his followers as heretics. Part of this publication was the famous Five points of Calvinism in response to the five articles of Remonstrance. Arminians across Holland were removed from office, imprisoned, banished, and sworn to silence. Twelve years later Holland officially granted Arminianism protection as a religion, although animosity between Arminians and Calvinists continued. Most of the early Remonstrants followed a classical version of Arminianism. However some, who have been called "Arminians of the head" such as Philipp van Limborch, moved in the direction of semi-Pelagianism and rationalism. Arminianism in the Church of England In England, the so-labelled Arminian doctrines were held, in substance, before and in parallel of Arminius. Actually, the Thirty-nine Articles of Religion (finalised in 1571), were sufficiently ambiguous that they could be interpreted as either Arminian or Calvinistic. Arminianism in the Church of England was fundamentally an expression of opposition to Calvinism, and only some theologians held to classical Arminianism, but for the rest they were either semi-Pelagian or Pelagian. In this specific context, contemporary historians prefer to use the term "proto-Arminians" rather than "Arminians" to designate the leanings of divines who didn't follow classical Arminianism. English Arminianism was represented by Arminian Puritans such as John Goodwin or High Anglican Arminians such as Jeremy Taylor and Henry Hammond. Anglican Arminians of the 17th century such as William Laud (1573-1645) fought Calvinist Puritans. They actually saw Arminianism in terms of a state church, idea that was completely alien to the views of Arminius. This position became particularly evident under the reign (1625-1649) of Charles I of England. Following the English Civil War (1642–1651) Charles II of England, who despised the Presbyterians, re-instituted Arminian thought in the Church of England. It was dominant there for some fifty years. Baptists The debate between Calvin's followers and Arminius's followers is characteristic of post-Reformation church history. The emerging Baptist movement in 17th-century England, for example, was a microcosm of the historic debate between Calvinists and Arminians. The first Baptists—called "General Baptists" because of their confession of a "general" or unlimited atonement—were Arminians. The Baptist movement originated with Thomas Helwys, who left his mentor John Smyth (who had moved into shared belief and other distinctives of the Dutch Waterlander Mennonites of Amsterdam) and returned to London to start the first English Baptist Church in 1611. Later General Baptists such as John Griffith, Samuel Loveday, and Thomas Grantham defended a Reformed Arminian theology that reflected the Arminianism of Arminius. The General Baptists encapsulated their Arminian views in numerous confessions, the most influential of which was the Standard Confession of 1660. In the 1640s the Particular Baptists were formed, diverging strongly from Arminian doctrine and embracing the strong Calvinism of the Presbyterians and Independents. Their robust Calvinism was publicized in such confessions as the London Baptist Confession of 1644 and the Second London Confession of 1689. The London Confession of 1689 was later used by Calvinistic Baptists in America (called the Philadelphia Baptist Confession), whereas the Standard Confession of 1660 was used by the American heirs of the English General Baptists, who soon came to be known as Free Will Baptists. Methodists This same dynamic between Arminianism and Calvinism can be seen in the heated discussions between friends and fellow Anglican ministers John Wesley and George Whitefield. Wesley was highly influenced by 17th-century English Arminianism and thinkers such as John Goodwin, Jeremy Taylor and Henry Hammond of the Anglican "Holy Living" school, and the Remonstrant Hugo Grotius. Wesley knew very little about the beliefs of Jacobus Arminius and arrived at his religious views independently of Arminius. Wesley acknowledged late in life, with the 1778 publication of a periodical titled The Arminian, that he and Arminius were in general agreement. Theology Professor W. Stephen Gunther concludes he was "a faithful representative" of Arminius' beliefs. Wesley was a champion of Arminian teachings, defending his soteriology in The Arminian and writing articles such as Predestination Calmly Considered. He defended Arminianism against charges of semi-Pelagianism, holding strongly to beliefs in original sin and total depravity. At the same time, Wesley attacked the determinism that he claimed characterized Calvinistic doctrines of unconditional election and reprobation and maintained a belief in the ability to lose salvation. Wesley also clarified the doctrine of prevenient grace and preached the ability of Christians to attain to perfection (fully mature, not "sinlessness"). His system of thought has become known as Wesleyan Arminianism, the foundations of which were laid by Wesley and his fellow preacher John William Fletcher. Pentecostals Pentecostalism has its background in the activity of Charles Parham (1873–1929). Its origin as a movement was in the Azusa Street Revival in Los Angeles in 1906. This revival was led by William J. Seymour (1870–1922). Due to the Methodist and Holiness background of many early Pentecostal preachers the Pentecostal Churches usually possessed practices which arose from the Wesleyan Arminianism. During the 20th century, as Pentecostal churches began to settle and incorporate more standard forms, they started to formulate theology, which was fully Arminian. Currently, the two largest Pentecostal denominations in the world, the Assemblies of God and the Pentecostal Church of God denominations, hold officially to Arminian views such as conditional election, or conditional security of the believer for the first. Current landscape Protestant denominations Advocates of Arminianism find a home in many Protestant denominations, and sometimes other belief as Calvinism exist within the same denomination. Faiths leaning at least in part in the Arminian direction include some of high-church Anglicanism. Arminianism is found within the Conservative Mennonites, the Old Order Mennonites and the Amish. It is found in the mainline Methodists churches, and especially in the various Holiness denominations such as the Church of the Nazarene, the Free Methodist Church, the Wesleyan Church, and the Salvation Army. It is found within the Restoration movement in the Christian Churches and Churches of Christ. It is found in the Seventh-day Adventist Church. It is found within the General Baptists and the Free Will Baptists. The majority of Southern Baptists, accept Arminianism with an exception allowing for a doctrine of eternal security, though many see Calvinism as growing in acceptance. It is also found in a part of the Charismatics including the Pentecostals. Scholarly support The current scholarly support for Arminianism is varied: Among Baptist theologians, Roger E. Olson, F. Leroy Forlines, Robert Picirilli, and J. Matthew Pinson are four supporters of a return to the teachings of Arminius. Forlines and Olson have referred to such Arminianism as "classical Arminianism", while Picirilli, Pinson, have termed it "Reformation Arminianism" or "Reformed Arminianism". Methodist theologian Thomas Oden, "Evangelical Methodists" Bible scholar Ben Witherington III, and Christian apologist David Pawson are generally Arminian in their theologies. Holiness movement theologians Henry Orton Wiley, Carl O. Bangs and J. Kenneth Grider can also be mentioned among recent proponents of Arminianism. Various other theologians or Bible scholars as B. J. Oropeza, Keith D. Stanglin, Craig S. Keener, Thomas H. McCall, and Grant R. Osborne can be mentioned as well. Theology Theological legacy The original beliefs of Jacobus Arminius himself are commonly called Arminianism, but more broadly, the term may embrace the teachings of Simon Episcopius, Hugo Grotius, John Wesley, and others. Arminian theology usually falls into one of two groups—Classical Arminianism, drawn from the teaching of Jacobus Arminius—and Wesleyan Arminian, drawing primarily from Wesley. Both groups overlap substantially. In 529, at the Second Council of Orange, the question at hand was whether the doctrines of Augustine on God's providence were to be affirmed, or if semi-Pelagianism could be affirmed. Semi-Pelagianism was a moderate form of Pelagianism which teaches that the first step of Salvation is by human will and not the grace of God. The determination of the Council could be considered "semi-Augustinian". It defined that faith, though a free act of man, resulted, even in its beginnings, from the grace of God, enlightening the human mind and enabling belief. This describes the operation of prevenient grace allowing the unregenerate to repent in faith. On the other hand, the Council of Orange condemned the Augustinian teaching of predestination to damnation. Since Arminianism is aligned with those characteristic semi-Augustinian views it has been seen by some as a reclamation of early church theological consensus. Moreover, Arminianism can also be seen as a soteriological diversification of Calvinism or as a theological middle ground between Calvinism and semi-Pelagianism. Classical Arminianism Classical Arminianism is the theological system that was presented by Jacobus Arminius and maintained by some of the Remonstrants. His teachings held to Sola fide and Sola gratia of the Reformation, but they were distinct from particular teachings of Martin Luther, Huldrych Zwingli, John Calvin, and other Protestant Reformers. Classical Arminianism was originally articulated in the Five Articles of Remonstrance. "These points", note Keith D. Stanglin and Thomas H. McCall, "are consistent with the views of Arminius; indeed, some come verbatim from his Declaration of Sentiments." Classical Arminianism serves as the foundation for all Arminian systems. A list of beliefs is given below: God's providence and human free will The majority Arminian view accepts classical theism, which states that God is omnipresent, omnipotent, and omniscient. In that view, God's power, knowledge, and presence have no external limitations, that is, outside of his divine nature and character. Besides, Arminianism view on God's sovereignty is based on postulates stemming from God's character, especially as fully revealed in Jesus Christ. On the first hand, divine election must be defined in such a way that God is not in any case, and even in a secondary way, the author of evil. It would not correspond to the character of God. On the other hand, man's responsibility for evil must be absolutely preserved. Those two postulates require a specific way by which God chooses to manifest his sovereignty when interacting with his creatures: On the first hand, it requires, for God to operates according to a limited mode of providence. This means that God purposely exercises his sovereignty in ways that do not illustrate the full extent of his omnipotence. On the second hand, it requires for God's election to be a "predestination by foreknowledge". In that respect, God's foreknowledge reconciles with human free will in the following way: Human free will is limited by original sin, though God's prevenient grace restores to humanity the ability to accept God's call of salvation. God's foreknowledge of the future is exhaustive and complete, and therefore the future is certain and not contingent on human action. God does not determine the future, but He does know it. God's certainty and human contingency are compatible. Roger Olson expressed those defining ideas in a more practical way:""Arminianism," [...] is simply a term we use in theology for the view, held by some people before Arminius and many after him, that sinners who hear the gospel have the free will to accept or reject God’s offer of saving grace and that nobody is excluded by God from the possibility of salvation except those who freely exclude themselves. But true, historical, classical Arminianism includes the belief that this free will [to repent and believe unto salvation] is itself a gift of God through prevenient grace." Condition of humanity Depravity is total: Arminius states "In this [fallen] state, the free will of man towards the true good is not only wounded, infirm, bent, and weakened; but it is also imprisoned, destroyed, and lost. And its powers are not only debilitated and useless unless they be assisted by grace, but it has no powers whatever except such as are excited by Divine grace." Extent and nature of the atonement Atonement is intended for all: Jesus's death was for all people, Jesus draws all people to himself, and all people have opportunity for salvation through faith. Jesus's death satisfies God's justice: The penalty for the sins of the elect is paid in full through the crucifixion of Christ. Thus Christ's death atones for the sins of all, but requires faith to be effected. Arminius states that "Justification, when used for the act of a Judge, is either purely the imputation of righteousness through mercy [...] or that man is justified before God [...] according to the rigor of justice without any forgiveness." Stephen Ashby clarifies: "Arminius allowed for only two possible ways in which the sinner might be justified: (1) by our absolute and perfect adherence to the law, or (2) purely by God's imputation of Christ's righteousness." W. Stephen Gunter concur that Arminius would not take a rigid position on the doctrine of imputed righteousness (the righteousness of Christ is imputed for righteousness of the believer). For Keith D. Stanglin and Thomas H. McCall, Arminius would not object to say rather that "the righteousness of Christ is imputed to righteousness". Forlines put it this way: "On the condition of faith, we are placed in union with Christ. Based on that union, we receive His death and righteousness". Christ's atonement has a substitutionary effect which is limited only to the elect. Arminius held that God's justice was satisfied by penal substitution. Hugo Grotius taught that it was satisfied governmentally. According to Roger Olson, historical and contemporary Arminians have held to one of these views. Conversion of man Grace is resistible: God takes initiative in the salvation process and his grace comes to all people. This grace (often called prevenient or pre-regenerating grace) acts on all people to convince them of the Gospel, draw them strongly towards salvation, and enable the possibility of sincere faith. Picirilli states that "indeed this grace is so close to regeneration that it inevitably leads to regeneration unless finally resisted." The offer of salvation through grace does not act irresistibly in a purely cause-effect, deterministic method but rather in an influence-and-response fashion that can be both freely accepted and freely denied. Man has a freed will to respond or resist: Free will is granted and limited by God's sovereignty, but God's sovereignty allows all men the choice to accept the Gospel of Jesus through faith, simultaneously allowing all men to resist. Conversion is synergistic: As Roger Olson put it: "[Arminius]' evangelical synergism reserves all the power, ability and efficacy in salvation to grace, but allows humans the God-granted ability to resist or not resist it. The only "contribution" humans make is nonresistance to grace." Election of man Election is conditional: Arminius defined election as "the decree of God by which, of Himself, from eternity, He decreed to justify in Christ, believers, and

the believer's future inheritance. The elect are therefore predestined to sonship through adoption, glorification, and eternal life. Preservation of man Related to eschatological considerations, Jacobus Arminius and the first Remonstrants, including Simon Episcopius believed in everlasting fire where the wicked are thrown by God at judgment day. Eternal preservation is conditional: All believers have full assurance of salvation with the condition that they remain in Christ. Salvation is conditioned on faith, therefore perseverance is also conditioned. Arminius believed the Scriptures taught that believers are graciously empowered by Christ and the Holy Spirit "to fight against Satan, sin, the world and their own flesh, and to gain the victory over these enemies." Furthermore, Christ and the Spirit are ever present to aid and assist believers through various temptations. But this security was not unconditional but conditional—"provided they [believers] stand prepared for the battle, implore his help, and be not wanting to themselves, Christ preserves them from falling." Possibility of apostasy Arminius believed in the possibility for a believer to commit apostasy (i.e., desert Christ by cleaving again to this evil world, losing a good conscience, or by failing to hold on to sound doctrine). However, over the period of time Arminius wrote on this question, he expressed sometimes more prudently. For instance, Arminius declared in 1599 that this matter required further study in the Scriptures. Arminius said also in his "Declaration of Sentiments" (1607), "I never taught that a true believer can, either totally or finally fall away from the faith, and perish; yet I will not conceal, that there are passages of scripture which seem to me to wear this aspect; and those answers to them which I have been permitted to see, are not of such a kind as to approve themselves on all points to my understanding." But in his other writings he expressed certainty about the possibility of falling away: Arminius wrote in ca. 1602, that "a person who is being 'built' into the church of Christ may resist the continuation of this process". Concerning the believers he said "It may suffice to encourage them, if they know that no power or prudence can dislodge them from the rock, unless they of their own will forsake their position." He continued by saying that the covenant of God (Jeremiah 23) "does not contain in itself an impossibility of defection from God, but a promise of the gift of fear, whereby they shall be hindered from going away from God so long as that shall flourish in their hearts." He then taught that had King David died in his sins he would have been lost. In 1602, Arminius also wrote: "A believing member of Christ may become slothful, give place to sin, and gradually die altogether, ceasing to be a member". For Arminius, certain class of sin would cause a believer to fall, especially sin motivated by malice. In 1605 Arminius wrote: “But it is possible for a believer to fall into a mortal sin, as is seen in David. Therefore he can fall at that moment in which if he were to die, he would be condemned". Stanglin, along with McCall, point out that Arminius clearly sets forth two paths to apostasy 1. "rejection", or 2. "malicious sinning". Oropeza gives a general conclusion "If there is any consistency in Arminius' position, he did not seem to deny the possibility of falling away". After the death of Arminius in 1609, his followers wrote a Remonstrance (1610) based quite literally on their leader's "Declaration of Sentiments" (1607) which expressed prudence on the possibility of apostasy. In particular, its fifth article expressed the necessity of further study on the possibility of apostasy. Sometime between 1610 and the official proceeding of the Synod of Dort (1618), the Remonstrants became fully persuaded in their minds that the Scriptures taught that a true believer was capable of falling away from faith and perishing eternally as an unbeliever. They formalized their views in "The Opinion of the Remonstrants" (1618) which was their official stand during the Synod of Dort. Picirilli remarks: "Ever since that early period, then, when the issue was being examined again, Arminians have taught that those who are truly saved need to be warned against apostasy as a real and possible danger." They later expressed this same view in the Remonstrant Confession (1621). Forgivability of apostasy Stanglin points out that Arminius held that if the apostasy came from "malicious" sin, then it was forgivable. If it came from "rejection" it was not. Following Arminius, the Remonstrants believed that, though possible, apostasy was not in general irremediable. However, other classical Arminians as the Free Will Baptists have taught that apostasy is irremediable. Wesleyan Arminianism John Wesley thoroughly agreed with the vast majority of what Arminius himself taught. Wesleyan Arminianism is classical Arminianism with the addition of Wesleyan perfectionism. Here are mentioned some positions on specific issues within Wesleyan Arminianism: Nature of the atonement Steven Harper proposed that Wesley's atonement is a hybrid of the penal substitution theory and the governmental theory. However, theologians as Robert Picirilli, Roger Olson and Darren Cushman Wood consider that the view of Wesley concerning atonement is by penal substitution. Wesleyan Arminians have historically adopted either penal or governmental theory of the atonement. Preservation and apostasy of man Wesley fully accepted the Arminian view that genuine Christians could apostatize and lose their salvation, as his famous sermon "A Call to Backsliders" clearly demonstrates. Harper summarizes as follows: "the act of committing sin is not in itself ground for the loss of salvation [...] the loss of salvation is much more related to experiences that are profound and prolonged. Wesley sees two primary pathways that could result in a permanent fall from grace: unconfessed sin and the actual expression of apostasy." Wesley believed that such apostasy was not irremediable. When talking about those who have made "shipwreck" of their faith,(1 Tim 1:19) Wesley claims that "not one, or a hundred only, but I am persuaded, several thousands [...] innumerable are the instances [...] of those who had fallen but now stand upright." Christian perfection One issue that typify Wesleyan Arminianism is Christian perfection. According to Wesley's teaching, Christians could attain a state of practical perfection, meaning a lack of all voluntary sin by the empowerment of the Holy Spirit, in this life. Christian perfection (or entire sanctification), according to Wesley, is "purity of intention, dedicating all the life to God" and "the mind which was in Christ, enabling us to walk as Christ walked." It is "loving God with all our heart, and our neighbor as ourselves". It is "a restoration not only to the favour, but likewise to the image of God," our "being filled with the fullness of God". Wesley was clear that Christian perfection did not imply perfection of bodily health or an infallibility of judgment. It also does not mean we no longer violate the will of God, for involuntary transgressions remain. Perfected Christians remain subject to temptation, and have continued need to pray for forgiveness and holiness. It is not an absolute perfection but a perfection in love. Furthermore, Wesley did not teach a salvation by perfection, but rather says that, "Even perfect holiness is acceptable to God only through Jesus Christ." Other variations Some doctrines adhere among other to the Arminian foundation and, while minority views, are highlighted below. Open theism The doctrine of open theism states that God is omnipresent, omnipotent, and omniscient, but differs on the nature of the future. Open theists claim that the future is not completely determined (or "settled") because people have not made their free decisions yet. God therefore knows the future partially in possibilities (human free actions) rather than solely certainties (divinely determined events). Some Arminians, such as professor and theologian Robert Picirilli, reject the doctrine of open theism as a "deformed Arminianism". Joseph Dongell stated that "open theism actually moves beyond classical Arminianism towards process theology." There are also some Arminians, like Roger Olson, who believe Open theism to be an alternative view that a Christian can have. Corporate view of election The majority Arminian view is that election is individual and based on God's foreknowledge of faith, but a second perspective deserves mention. These Arminians reject the concept of individual election entirely, preferring to understand the doctrine in corporate terms. According to this corporate election, God never chose individuals to elect to salvation, but rather He chose to elect the believing church to salvation. Dutch Reformed theologian Herman Ridderbos says "[The certainty of salvation] does not rest on the fact that the church belongs to a certain "number", but that it belongs to Christ, from before the foundation of the world. Fixity does not lie in a hidden decree, therefore, but in corporate unity of the Church with Christ, whom it has come to know in the gospel and has learned to embrace in faith." Corporate election draws support from a similar concept of corporate election found in the Old Testament and Jewish law. Indeed most biblical scholarship is in agreement that Judeo-Greco-Roman thought in the 1st century was opposite of the Western world's "individual first" mantra—it was very collectivist or communitarian in nature. Identity stemmed from membership in a group more than individuality. According to Romans 9–11, supporters claim, Jewish election as the chosen people ceased with their national rejection of Jesus as Messiah. As a result of the new covenant, God's chosen people are now the corporate body of Christ, the church (sometimes called spiritual Israel—see also Covenant theology). The pastor and theologian Brian Abasciano claims "What Paul says about Jews, Gentiles, and Christians, whether of their place in God’s plan, or their election, or their salvation, or how they should think or behave, he says from a corporate perspective which views the group as primary and those he speaks about as embedded in the group. These individuals act as members of the group to which they belong, and what happens to them happens by virtue of their membership in the group." These scholars also maintain that Jesus was the only human ever elected and that individuals must be "in Christ" through faith to be part of the elect. This was, in fact, Swiss Reformed theologian, Karl Barth's, understanding of the doctrine of election. Joseph Dongell, professor at Asbury Theological Seminary, states "the most conspicuous feature of Ephesians 1:3–2:10 is the phrase 'in Christ', which occurs twelve times in Ephesians 1:3–14 alone [...] this means that Jesus Christ himself is the chosen one, the predestined one. Whenever one is incorporated into him by grace through faith, one comes to share in Jesus' special status as chosen of God." Markus Barth illustrates the inter-connectedness: "Election in Christ must be understood as the election of God's people. Only as members of that community do individuals share in the benefits of God's gracious choice." Arminianism and other views Divergence with Pelagianism Pelagianism is a doctrine denying original sin and total depravity. No system of Arminianism founded on Arminius or Wesley denies original sin or total depravity; both Arminius and Wesley strongly affirmed that man's basic condition is one in which he cannot be righteous, understand God, or seek God. Arminius referred to Pelagianism as "the grand falsehood" and stated that he "must confess that I detest, from my heart, the consequences [of that theology]." David Pawson, a British pastor, decries this association as "libelous" when attributed to Arminius' or Wesley's doctrine. Indeed, most Arminians reject all accusations of Pelagianism. Divergence with semi-Pelagianism Some schools of thought, notably semi-Pelagianism, which teaches that the first step of Salvation is by human will, are confused as being Arminian in nature. But classical Arminianism and Wesleyan Arminianism hold that the first step of Salvation is through the prevenient grace of God, though "the subsequent grace entails a cooperative relationship." Divergence with Calvinism The two systems of Calvinism and Arminianism share both history and many doctrines, and the history of Christian theology. However, because of their differences over the doctrines of divine predestination and election, many people view these schools of thought as opposed to each other. The distinction is whether God desires to save all yet allows individuals to resist the grace

Anything Once (1993), On Air (1996), The Time Machine (1999), A Valid Path (2004) and The Secret (2019). Meanwhile, Woolfson made concept albums titled Freudiana (1990), about Sigmund Freud's work on psychology, and Poe: More Tales of Mystery and Imagination (2003); this continued from the Alan Parsons Project's first album about Edgar Allan Poe's literature. Tales of Mystery and Imagination (1976) was re-mixed in 1987 for release on CD, and included narration by Orson Welles recorded in 1975, but delivered too late to be included on the original album. For the 2007 deluxe edition release, parts of this tape were used for the 1976 Griffith Park Planetarium launch of the original album, the 1987 remix, and various radio spots. All were included as bonus material. Sound The band's sound is described as progressive rock, art rock, progressive pop, and soft rock. "Sirius" is their best-known and most-frequently heard of all Parsons/Woolfson songs. It was used as entrance music by various American sports teams, notably by the Chicago Bulls during their 1990s NBA dynasty. It was also used as the entrance theme for Ricky Steamboat in pro wrestling of the mid-1980s. In addition, "Sirius" is played in a variety of TV shows and movies including the BBC series Record Breakers, the episode "Vanishing Act" of The Adventures of Jimmy Neutron: Boy Genius and the 2009 film Cloudy with a Chance of Meatballs. Vocal duties were shared by guests to complement each song. In later years, Woolfson sang lead on many of the group's hits, including "Time", "Eye in the Sky", and "Don't Answer Me". The record company pressured Parsons to use him more, however Parsons preferred to use polished proficient singers; Woolfson admitted he was not in that category. In addition to Woolfson, vocalists Chris Rainbow, Lenny Zakatek, John Miles, David Paton, and Colin Blunstone are regulars. Other singers, such as Arthur Brown, Steve Harley, Gary Brooker, Dave Terry a.k.a. Elmer Gantry, Vitamin Z's Geoff Barradale, and Marmalade's Dean Ford, recorded only once or twice with the Project. Parsons sang lead on one song ("The Raven") through a vocoder and backing on a few others, including "To One in Paradise". Both of those songs appeared on Tales of Mystery and Imagination (1976). Parsons also sings a prominent counter melody on “Time”. A variety of session musicians worked with the Alan Parsons Project regularly, contributing to the recognizable style of a song despite the varied singer line-up. With Parsons and Woolfson, the studio band consisted of the group Pilot, with Ian Bairnson (guitar), David Paton (bass) and Stuart Tosh (drums). Pilot's keyboardist Billy Lyall contributed. From Pyramid (1978) onward, Tosh was replaced by Stuart Elliott of Cockney Rebel. Bairnson played on all albums, and Paton stayed almost until the end. Andrew Powell appeared as arranger of orchestra (and often choirs) on all albums except Vulture Culture (1985); he was composing the score of Richard Donner's film Ladyhawke (1985). This score was partly in the APP style, recorded by most of the APP regulars, and produced and engineered by Parsons. Powell composed some material for the first two Project albums. For Vulture Culture and later, Richard Cottle played as a regular contributor on synthesizers and saxophone. The Alan Parsons Project played live only once under that name during its original incarnation because Woolfson and Parsons held the roles of writing and production, and because of the technical difficulties of re-producing on stage the complex instrumentation used in the studio. In the 1990s, musical production evolved with the technology of digital samplers. The one occasion the band was introduced as 'The Alan Parsons Project' in a live performance was at The Night of the Proms in October 1990. The concerts featured all Project regulars except Woolfson, present behind the scenes, while Parsons stayed at the mixer except for the last song, when he played acoustic guitar. Since 1993, Alan Parsons continues to perform live as the Alan Parsons Live Project to be distinct from 'The Alan Parsons Project'. The current line up consists of lead singer P.J. Olsson, guitarist Jeffrey Kollman, drummer Danny Thompson, keyboardist Tom Brooks, bass guitarist Guy Erez, vocalist and saxophonist Todd Cooper, and guitarist and vocalist Dan Tracey. In 2013, Alan Parsons Live Project played Colombia with a full choir and orchestra (the Medellin Philharmonic) as 'Alan Parsons Symphonic Project'. A 2-CD live set and a DVD version of this concert were released in May 2016. Members Official members Alan Parsons – production, engineering, programming, composition,vocals, keyboards, guitars (1975–1990) Eric Woolfson – composition, lyrics, piano, keyboards, vocals, executive production (1975–1990) Notable contributors Andrew Powell – composition, keyboards, orchestral arrangements (1975–1996) Philharmonia Orchestra Ian Bairnson – guitars (1975–1990) David Pack – guitars (1976, 1993), vocals, keyboards (1993) Richard Cottle – keyboards, saxophone (1984–1990) David Paton – bass, vocals (1975–1986) Stuart Tosh – drums, percussion (1975–1977) Stuart Elliott – drums, percussion (1977–1990) Geoff Barradale – vocals (1987) Phil Kenzie – saxophone (1978) Dennis Clarke – saxophone, clarinet (1975) Colin Blunstone – vocals (1978–1984) Gary Brooker – vocals (1985) Arthur Brown – vocals (1975) Lesley Duncan – vocals (1979) Graham Dye – vocals (1985, 1998) Dean Ford – vocals (1978) Dave Terry ("Elmer Gantry") – vocals (1980, 1982) Jack Harris – vocals (1976–1978) The Hollies – vocals John Miles – vocals

songs on the Project's albums are credited to "Woolfson/Parsons". The Alan Parsons Project released eleven studio albums in its 15-year career, including the successful I Robot and Eye in the Sky. Some of their most notable songs are "The Raven", "(The System of) Dr. Tarr and Professor Fether", "I Wouldn't Want to Be Like You", "Games People Play", "Time", "Snake Eyes", "Sirius"/"Eye in the Sky", "Old and Wise", and "Don't Answer Me". Career 1974–1976: Formation and debut Alan Parsons met Eric Woolfson in the canteen of Abbey Road Studios in the summer of 1974. Parsons acted as Assistant Engineer on the Beatles' albums Abbey Road (1969) and Let It Be (1970), engineered Pink Floyd's The Dark Side of the Moon (1973), and produced several acts for EMI Records. Woolfson, a songwriter and composer, was working as a session pianist while composing material for a concept album based on the work of Edgar Allan Poe. Woolfson's idea was to manage Alan and help his already successful production career. This was the start of their longstanding friendly business relationship. He managed Parsons's career as a producer and engineer through a string of successes, including Pilot, Steve Harley, Cockney Rebel, John Miles, Al Stewart, Ambrosia, and the Hollies. Woolfson came up with the idea of making an album based on developments in the film industry—the focal point of the films' promotion shifted from film stars to directors such as Alfred Hitchcock and Stanley Kubrick. If the film industry was becoming a director's medium, Woolfson felt the music business might well become a producer's medium. Recalling his earlier Edgar Allan Poe material, Woolfson saw a way to combine his and Parsons's talents. Parsons produced and engineered songs written and composed by the two, and the first Alan Parsons Project was begun. The Project's first album, Tales of Mystery and Imagination (1976), released by 20th Century Fox Records and including major contributions by all members of Pilot and Ambrosia, was a success, reaching the Top 40 in the US Billboard 200 chart. The song "The Raven" featured lead vocals by the actor Leonard Whiting. According to the 2007 re-mastered album liner notes, this was the first rock song to use a digital vocoder, with Alan Parsons speaking lyrics through it, although others such as Bruce Haack pioneered this field in the previous decade. 1977–1990: Mainstream success and final releases Arista Records then signed the Alan Parsons Project for further albums. Through the late 1970s and early 1980s, the Project's popularity continued to grow. However, the Project was always more popular in North America, Ibero-America, and Continental Europe than in Parsons's home country, never achieving a UK Top 40 single or Top 20 album. The singles "I Wouldn't Want to Be Like You", "Games People Play", "Damned If I Do", "Time" (the first single to feature Woolfson's lead vocal) and "Eye in the Sky" had a notable impact on the Billboard Hot 100. "Don't Answer Me" became the Project's last successful single in the United States; it reached the top 15 on the American charts in 1984. After those successes, however, the Project began to fade from view. There were fewer hit singles, and declining album sales. 1987's Gaudi would be the Project's final release, though it had planned to record an album called Freudiana (1990) next. The musical Freudiana Even though the studio version of Freudiana was produced by Parsons (and featured the regular Project session musicians, making it an 'unofficial' Project album), it was primarily Woolfson's idea to turn it into a musical. While Parsons pursued his own solo career and took many session players of the Project on the road for the first time in a successful worldwide tour, Woolfson went on to produce musical plays influenced by the Project's music. Freudiana, Gaudi, and Gambler were three musicals that included some Project songs like "Eye in the Sky", "Time", "Inside Looking Out", and "Limelight". The live music from Gambler was only distributed at the performance site in Mönchengladbach, Germany. The Sicilian Defence In 1979, Parsons, Woolfson, and their record label Arista, had been stalled in contract renegotiations when the two submitted an all-instrumental album tentatively titled The Sicilian Defence, named after an aggressive opening move in chess, arguably to get out of their recording contract. Arista's refusal to release the album had two known effects: the negotiations led to a renewed contract, and the album was not released at that time. In interviews he gave before his death in 2009, Woolfson said he planned to release one track from the "Sicilian" album, which in 2008 appeared as a bonus track on a CD re-issue of the Eve album. Sometime later, after he had relocated the original tapes, Parsons reluctantly agreed to release the album and announced that it would finally be released on an upcoming Project box set called The Complete Albums Collection in 2014 for the first time as a bonus disc. Parsons' and Woolfson's solo careers Parsons released titles under his name; these were Try Anything Once (1993), On Air (1996), The Time Machine (1999), A Valid Path (2004) and The Secret (2019). Meanwhile, Woolfson made concept albums titled Freudiana (1990), about Sigmund Freud's work on psychology, and Poe: More Tales of Mystery and Imagination (2003); this continued from the Alan Parsons Project's first album about Edgar Allan Poe's literature. Tales of Mystery and Imagination (1976) was re-mixed in 1987 for release on CD, and included narration by Orson Welles recorded in 1975, but delivered too late to be included on the original album. For the 2007 deluxe edition release, parts of this tape were used for the 1976 Griffith Park Planetarium launch of the original album, the 1987 remix, and various radio spots. All were included as bonus material. Sound The band's sound is described as progressive rock, art rock, progressive pop, and soft rock. "Sirius" is their best-known and

proved in his first set theory article, the set of algebraic numbers is countable as well, so almost all reals are transcendental. Almost all reals are normal. The Cantor set is null as well. Thus, almost all reals are not members of it even though it is uncountable. The derivative of the Cantor function is 0 for almost all numbers in the unit interval. It follows from the previous example because the Cantor function is locally constant, and thus has derivative 0 outside the Cantor set. Meaning in number theory In number theory, "almost all positive integers" can mean "the positive integers in a set whose natural density is 1". That is, if A is a set of positive integers, and if the proportion of positive integers in A below n (out of all positive integers below n) tends to 1 as n tends to infinity, then almost all positive integers are in A. More generally, let S be an infinite set of positive integers, such as the set of even positive numbers or the set of primes, if A is a subset of S, and if the proportion of elements of S below n that are in A (out of all elements of S below n) tends to 1 as n tends to infinity, then it can be said that almost all elements of S are in A. Examples: The natural density of cofinite sets of positive integers is 1, so each of them contains almost all positive integers. Almost all positive integers are composite. Almost all even positive numbers can be expressed as the sum of two primes. Almost all primes are isolated. Moreover, for every positive integer , almost all primes have prime gaps of more than both to their left and to their right; that is, there is no other primes between and . Meaning in graph theory In graph theory, if A is a set of (finite labelled) graphs, it can be said to contain almost all graphs, if the proportion of graphs with n vertices that are in A tends to 1 as n tends to infinity. However, it is sometimes easier to work with probabilities, so the definition is reformulated as follows. The proportion of graphs with n vertices that are in A equals the probability that a random graph with n vertices (chosen with the uniform distribution) is in A, and choosing a graph in this way has the same outcome as generating a graph by flipping a coin for each pair of vertices to decide whether to connect them. Therefore, equivalently to the preceding definition, the set A contains almost all graphs if the probability that a coin flip-generated graph with n vertices is in A tends to 1 as n tends to infinity. Sometimes, the latter definition is modified so that the graph is chosen randomly in some other way, where not all graphs with n vertices have the same probability, and those modified definitions are not always equivalent to the main one. The use of the term "almost all"

numbers is countable, and thus almost all real numbers are irrational. As Georg Cantor proved in his first set theory article, the set of algebraic numbers is countable as well, so almost all reals are transcendental. Almost all reals are normal. The Cantor set is null as well. Thus, almost all reals are not members of it even though it is uncountable. The derivative of the Cantor function is 0 for almost all numbers in the unit interval. It follows from the previous example because the Cantor function is locally constant, and thus has derivative 0 outside the Cantor set. Meaning in number theory In number theory, "almost all positive integers" can mean "the positive integers in a set whose natural density is 1". That is, if A is a set of positive integers, and if the proportion of positive integers in A below n (out of all positive integers below n) tends to 1 as n tends to infinity, then almost all positive integers are in A. More generally, let S be an infinite set of positive integers, such as the set of even positive numbers or the set of primes, if A is a subset of S, and if the proportion of elements of S below n that are in A (out of all elements of S below n) tends to 1 as n tends to infinity, then it can be said that almost all elements of S are in A. Examples: The natural density of cofinite sets of positive integers is 1, so each of them contains almost all positive integers. Almost all positive integers are composite. Almost all even positive numbers can be expressed as the sum of

Boyd textbook on organic chemistry. The proper use of the symbol is debated: some publications use it to any cyclic π system, while others use it only for those π systems that obey Hückel's rule. Jensen argues that, in line with Robinson's original proposal, the use of the circle symbol should be limited to monocyclic 6 π-electron systems. In this way the circle symbol for a six-center six-electron bond can be compared to the Y symbol for a three-center two-electron bond. Arene synthesis A reaction that forms an arene compound from an unsaturated or partially unsaturated cyclic precursor is simply called aromatization. Many laboratory methods exist for the organic synthesis of arenes from non-arene precursors. Many methods rely on cycloaddition reactions. Alkyne trimerization describes the [2+2+2] cyclization of three alkynes, in the Dötz reaction an alkyne, carbon monoxide and a chromium carbene complex are the reactants. Diels–Alder reactions of alkynes with pyrone or cyclopentadienone with expulsion of carbon dioxide or carbon monoxide also form arene compounds. In Bergman cyclization the reactants are an enyne plus a hydrogen donor. Another set of methods is the aromatization of cyclohexanes and other aliphatic rings: reagents are catalysts used in hydrogenation such as platinum, palladium and nickel (reverse hydrogenation), quinones and the elements sulfur and selenium. Reactions Aromatic ring systems participate in many organic reactions. Aromatic substitution In aromatic substitution one substituent on the arene ring, usually hydrogen, is replaced by another substituent. The two main types are electrophilic aromatic substitution when the active reagent is an electrophile and nucleophilic aromatic substitution when the reagent is a nucleophile. In radical-nucleophilic aromatic substitution the active reagent is a radical. An example of electrophilic aromatic substitution is the nitration of salicylic acid: Coupling reactions In coupling reactions a metal catalyses a coupling between two formal radical fragments. Common coupling reactions with arenes result in the formation of new carbon–carbon bonds e.g., alkylarenes, vinyl arenes, biraryls, new carbon–nitrogen bonds (anilines) or new carbon–oxygen bonds (aryloxy compounds). An example is the direct arylation of perfluorobenzenes Hydrogenation Hydrogenation of arenes create saturated rings. The compound 1-naphthol is completely reduced to a mixture of decalin-ol isomers. The compound resorcinol, hydrogenated with Raney nickel in presence of aqueous sodium hydroxide forms an enolate which is alkylated with methyl iodide to 2-methyl-1,3-cyclohexandione: Cycloadditions Cycloaddition reactions are not common. Unusual thermal Diels–Alder reactivity of arenes can be found in the Wagner-Jauregg reaction. Other photochemical cycloaddition reactions with alkenes occur through excimers. Dearomatization In dearomatization reactions the aromaticity of the reactant is permanently lost. Benzene and derivatives of benzene Benzene derivatives have from one to six substituents attached to the central benzene core. Examples of benzene compounds with just one substituent are phenol, which carries a hydroxyl group, and toluene with a methyl group. When there is more than one substituent present on the ring, their spatial relationship becomes important for which the arene substitution patterns

new carbon–nitrogen bonds (anilines) or new carbon–oxygen bonds (aryloxy compounds). An example is the direct arylation of perfluorobenzenes Hydrogenation Hydrogenation of arenes create saturated rings. The compound 1-naphthol is completely reduced to a mixture of decalin-ol isomers. The compound resorcinol, hydrogenated with Raney nickel in presence of aqueous sodium hydroxide forms an enolate which is alkylated with methyl iodide to 2-methyl-1,3-cyclohexandione: Cycloadditions Cycloaddition reactions are not common. Unusual thermal Diels–Alder reactivity of arenes can be found in the Wagner-Jauregg reaction. Other photochemical cycloaddition reactions with alkenes occur through excimers. Dearomatization In dearomatization reactions the aromaticity of the reactant is permanently lost. Benzene and derivatives of benzene Benzene derivatives have from one to six substituents attached to the central benzene core. Examples of benzene compounds with just one substituent are phenol, which carries a hydroxyl group, and toluene with a methyl group. When there is more than one substituent present on the ring, their spatial relationship becomes important for which the arene substitution patterns ortho, meta, and para are devised. For example, three isomers exist for cresol because the methyl group and the hydroxyl group can be placed next to each other (ortho), one position removed from each other (meta), or two positions removed from each other (para). Xylenol has two methyl groups in addition to the hydroxyl group, and, for this structure, 6 isomers exist. The arene ring has an ability to stabilize charges. This is seen in, for example, phenol (C6H5–OH), which is acidic at the hydroxyl (OH), since a charge on this oxygen (alkoxide –O−) is partially delocalized into the benzene ring. Other monocyclic aromatic hydrocarbon Other monocyclic aromatic hydrocarbon include Cyclotetradecaheptaene or Cyclooctadecanonaene. Polycyclic aromatic hydrocarbons Polynuclear aromatic hydrocarbons (PAHs) are aromatic hydrocarbons that consist of fused aromatic rings and do not contain heteroatoms or carry substituents. Naphthalene is the simplest example of a PAH. PAHs occur in oil, coal, and tar deposits, and are produced as byproducts of fuel burning (whether fossil fuel or biomass). As pollutants, they are of concern because some compounds have been identified as carcinogenic, mutagenic, and teratogenic. PAHs are also found in cooked foods. Studies have shown that high levels of PAHs are found, for example, in meat cooked at high temperatures such as grilling or barbecuing, and in smoked fish. They are also found in the interstellar medium, in comets, and in meteorites and are a candidate molecule to act as a basis for the earliest forms of life. In graphene the PAH motif is extended to large 2D sheets.

north side (A), defended by three iron doors. Near the entrance is a large tower (M), a constant feature in the monasteries of the Levant (Eastern Mediterranean area). There is a small postern gate at L. The enceinte comprises two large open courts, surrounded with buildings connected with cloister galleries of wood or stone. The outer court, which is the larger by far, contains the granaries and storehouses (K), the kitchen (H) and other offices connected with the refectory (G). Immediately adjacent to the gateway is a two-storied guest-house, entered from a cloister (C). The inner court is surrounded by a cloister (EE) from which one enters the monks' cells (II). In the centre of this court stands the katholikon or conventual church, a square building with an apse of the cruciform domical Byzantine type, approached by a domed narthex. In front of the church stands a marble fountain (F), covered by a dome supported on columns. Opening from the western side of the cloister, but actually standing in the outer court, is the refectory (G), a large cruciform (cross shaped) building, about square, decorated within with frescoes of saints. At the upper end is a semicircular recess, similar to the triclinium of the Lateran Palace in Rome, in which is placed the seat of the hegumenos or abbot. This apartment is chiefly used as a meeting place, with the monks usually taking their meals in their separate cells. Adoption of the Roman villa plan Monasticism in the West began with the activities of Benedict of Nursia (born 480 AD). Near Nursia, a town in Perugia, Italy, a first abbey was established at Monte Cassino (529 AD). Between 520 and 700 AD, monasteries were built which were spacious and splendid. All the city states of Italy hosted a Benedictine convent as did the cities of England, France and Spain. By 1415 AD, the time of the Council of Constance, 15,070 Benedictine monasteries had been established. The early Benedictine monasteries, including the first at Monte Cassino, were constructed on the plan of the Roman villa. The layout of the Roman villa was quite consistent throughout the Roman Empire and where possible, the monks reused available villas in sound repair. This was done at Monte Cassino. However, over time, changes to the common villa lay out occurred. The monks required buildings which suited their religious and day-to-day activities. No overriding specification was demanded of the monks but the similarity of their needs resulted in uniformity of design of abbeys across Europe. Eventually, the buildings of a Benedictine abbey were built in a uniform lay out, modified where necessary, to accommodate local circumstances. Abbey of St Gall The plan of the Abbey of Saint Gall (719 AD) in what is now Switzerland indicates the general arrangement of a Benedictine monastery of its day. According to the architect Robert Willis (architect) (1800–1875) the Abbey's lay out is that of a town of individual houses with streets running between them. The abbey was planned in compliance with the Benedictine rule that, if possible, a monastery should be self-contained. For instance, there was a mill, a bakehouse, stables, and cattle stalls. In all, there were thirty-three separate structures; mostly one level wooden buildings. The Abbey church occupied the centre of a quadrangular area, about square. On the eastern side of the north transept of the church was the "scriptorium" or writing-room, with a library above. The church and nearby buildings ranged about the cloister, a court about which there was a covered arcade which allowed sheltered movement between the buildings. The nave of the church was on the north boundary of the cloister. On the east side of the cloister, on the ground floor, was the "pisalis" or "calefactory". This was a common room, warmed by flues beneath the floor. Above the common room was the dormitory. The dormitory opened onto the cloister and also onto the south transept of the church. This enabled the monks to attend nocturnal services. A passage at the other end of the dormitory lead to the "necessarium" (latrines). On the south side of the cloister was the refectory. The kitchen, at the west end of the refectory was accessed via an anteroom and a long passage. Nearby were the bake house, brew house and the sleeping-rooms of the servants. The upper story of the refectory was called the "vestiarium" (a room where the ordinary clothes of the monks were stored). On the western side of the cloister was another two-story building with a cellar on the ground floor and the larder and store-room on the upper floor. Between this building and the church was a parlour for receiving visitors. One door of the parlour led to the cloisters and the other led to the outer part of the Abbey. Against the outer wall of the church was a school and headmaster's house. The school consisted of a large schoolroom divided in the middle by a screen or partition, and surrounded by fourteen little rooms, the "dwellings of the scholars". The abbot's home was near the school. To the north of the church and to the right of the main entrance to the Abbey, was a residence for distinguished guests. To the left of the main entrance was a building to house poor travellers and pilgrims. There was also a building to receive visiting monks. These "hospitia" had a large common room or refectory surrounded by bed rooms. Each hospitium had its own brewhouse and bakehouse, and the building for more prestigious travellers had a kitchen and storeroom, with bedrooms for the guests' servants and stables for their horses. The monks of the Abbey lived in a house built against the north wall of the church. The whole of the southern and western areas of the Abbey were devoted to workshops, stables and farm-buildings including stables, ox-sheds, goatstables, piggeries, and sheep-folds, as well as the servants' and labourers' quarters. In the eastern part of the Abbey there was a group of buildings representing in layout, two complete miniature monasteries. That is, each had a covered cloister surrounded by the usual buildings such as the church, the refectory, the dormitory and so on. A detached building belonging to each contained a bathroom and a kitchen. One of the miniature complexes was called the "oblati". These were the buildings for the novices. The other complex was a hospital or infirmary for the care of sick monks. This infirmary complex included a physician's residence, a physic garden, a drug store, and a chamber for the critically ill. There was also a room for bloodletting and purging. The physic garden occupied the north east corner of the Abbey. In the southernmost area of the abbey was the workshop containing utilities for shoemakers, saddlers (or shoemakers, sellarii), cutlers and grinders, trencher-makers, tanners, curriers, fullers, smiths and goldsmiths. The tradesmen's living quarters were at the rear of the workshop. Here, there were also farm buildings, a large granary and threshing-floor, mills, and malthouse. At the south-east corner of the Abbey were hen and duck houses, a poultry-yard, and the dwelling of the keeper. Nearby was the kitchen garden which complemented the physic garden and a cemetery orchard. Every large monastery had priories. A priory was a smaller structure or entities which depended on the monastery. Some were small monasteries accommodating five or ten monks. Others were no more than a single building serving as residence or a farm offices. The outlying farming establishments belonging to the monastic foundations were known as "villae" or "granges". They were usually staffed by lay-brothers, sometimes under the supervision of a monk. Benedictine abbeys in England Many of today's cathedrals in England were originally Benedictine monasteries. These included Canterbury, Chester, Durham, Ely, Gloucester, Norwich, Peterborough, Rochester, Winchester, and Worcester. Shrewsbury Abbey in Shropshire was founded as a Benedictine monastery by the Normans in 1083. Westminster Abbey Westminster Abbey was founded in the tenth century by Saint Dunstan who established a community of Benedictine monks. The only traces of St Dunstan's monastery remaining are round arches and massive supporting columns of the undercroft and the Pyx Chamber. The cloister and buildings lie directly to the south of the church. Parallel to the nave, on the south side of the cloister, was a refectory, with a lavatory at the door. On the eastern side, there was a dormitory, raised on a vaulted substructure and communicating with the south transept and a chapter house (meeting room). A small cloister lay to the south-east of the large cloister. Beyond that was an infirmary with a table hall and a refectory for those who were able to leave their chambers. At the west entrance to the Abbey, there was a house and

Tabennae on the Nile, in Upper Egypt, Saint Pachomius laid the foundations for the coenobitical life by arranging everything in an organized manner. He built several monasteries, each with about 1,600 separate cells laid out in lines. These cells formed an encampment where the monks slept and performed some of their manual tasks. There were nearby large halls such as the church, refectory, kitchen, infirmary, and guest house for the monk's common needs. An enclosure protecting all these buildings gave the settlement the appearance of a walled village. This layout, known as the laurae (lanes), became popular throughout Israel. As well as the "laurae", communities known as "caenobia" developed. These were monasteries where monks lived a common life together. The monks were not permitted to retire to the cells of a laurae before they had undergone a lengthy period of training. In time, this form of common life superseded that of the older laurae. In the late 300s AD, Palladius visited the Egyptian monasteries. He described three hundred members of the coenobium of Panopolis. There were fifteen tailors, seven smiths, four carpenters, twelve camel-drivers and fifteen tanners. These people were divided into subgroups, each with its own "oeconomus". A chief steward was at the head of the monastery. The produce of the monastery was brought to Alexandria for sale. The moneys raised were used to purchase stores for the monastery or were given away as charity. Twice in the year, the superiors of several coenobia met at the chief monastery, under the presidency of an "archimandrite" (the "chief of the fold" from the word, "miandra" (a sheepfold)) in order to make their reports. Chrysostom recorded the workings of a coenobia in the vicinity of Antioch. The monks lived in separate huts ("kalbbia") which formed a religious hamlet on the mountainside. They were subject to an abbot, and observed a common rule. Great Lavra, Mount Athos The layout of the monastic coenobium was influenced by a number of factors. These included a need for defence, economy of space, and convenience of access. The layout of buildings became compact and orderly. Larger buildings were erected and defence was provided by strong outside walls. Within the walls, the buildings were arranged around one or more open courts surrounded by cloisters. The usual arrangement for monasteries of the Eastern world is exemplified in the plan of the convent of the Great Lavra at Mount Athos. With reference to the diagram, right, the convent of the Great Lavra is enclosed within a strong and lofty blank stone wall. The area within the wall is between three and four acres (12,000 and 16,000 m2). The longer side is about in length. There is only one entrance, which is located on the north side (A), defended by three iron doors. Near the entrance is a large tower (M), a constant feature in the monasteries of the Levant (Eastern Mediterranean area). There is a small postern gate at L. The enceinte comprises two large open courts, surrounded with buildings connected with cloister galleries of wood or stone. The outer court, which is the larger by far, contains the granaries and storehouses (K), the kitchen (H) and other offices connected with the refectory (G). Immediately adjacent to the gateway is a two-storied guest-house, entered from a cloister (C). The inner court is surrounded by a cloister (EE) from which one enters the monks' cells (II). In the centre of this court stands the katholikon or conventual church, a square building with an apse of the cruciform domical Byzantine type, approached by a domed narthex. In front of the church stands a marble fountain (F), covered by a dome supported on columns. Opening from the western side of the cloister, but actually standing in the outer court, is the refectory (G), a large cruciform (cross shaped) building, about square, decorated within with frescoes of saints. At the upper end is a semicircular recess, similar to the triclinium of the Lateran Palace in Rome, in which is placed the seat of the hegumenos or abbot. This apartment is chiefly used as a meeting place, with the monks usually taking their meals in their separate cells. Adoption of the Roman villa plan Monasticism in the West began with the activities of Benedict of Nursia (born 480 AD). Near Nursia, a town in Perugia, Italy, a first abbey was established at Monte Cassino (529 AD). Between 520 and 700 AD, monasteries were built which were spacious and splendid. All the city states of Italy hosted a Benedictine convent as did the cities of England, France and Spain. By 1415 AD, the time of the Council of Constance, 15,070 Benedictine monasteries had been established. The early Benedictine monasteries, including the first at Monte Cassino, were constructed on the plan of the Roman villa. The layout of the Roman villa was quite consistent throughout the Roman Empire and where possible, the monks reused available villas in sound repair. This was done at Monte Cassino. However, over time, changes to the common villa lay out occurred. The monks required buildings which suited their religious and day-to-day activities. No overriding specification was demanded of the monks but the similarity of their needs resulted in uniformity of design of abbeys across Europe. Eventually, the buildings of a Benedictine abbey were built in a uniform lay out, modified where necessary, to accommodate local circumstances. Abbey of St Gall The plan of the Abbey of Saint Gall (719 AD) in what is now Switzerland indicates the general arrangement of a Benedictine monastery of its day. According to the architect Robert Willis (architect) (1800–1875) the Abbey's lay out is that of a town of individual houses with streets running between them. The abbey was planned in compliance with the Benedictine rule that, if possible, a monastery should be self-contained. For instance, there was a mill, a bakehouse, stables, and cattle stalls. In all, there were thirty-three separate structures; mostly one level wooden buildings. The Abbey church occupied the centre of a quadrangular area, about square. On the eastern side of the north transept of the church was the "scriptorium" or writing-room, with a library above. The church and nearby buildings ranged about the cloister, a court about which there was a covered arcade which allowed

2013, it began publication of an English language edition, with all the articles translated. The scope of topics covered by the journal is vast and experimental—there is a search for total history and new approaches. The emphasis is on social history, and very long-term trends, often using quantification and paying special attention to geography and to the intellectual world view of common people, or "mentality" (mentalité). Little attention is paid to political, diplomatic, or military history, or to biographies of famous men. Instead the Annales focused attention on the synthesizing of historical patterns identified from social, economic, and cultural history, statistics, medical reports, family studies, and even psychoanalysis. Origins The Annales was founded and edited by Marc Bloch and Lucien Febvre in 1929, while they were teaching at the University of Strasbourg and later in Paris. These authors, the former a medieval historian and the latter an early modernist, quickly became associated with the distinctive Annales approach, which combined geography, history, and the sociological approaches of the Année Sociologique (many members of which were their colleagues at Strasbourg) to produce an approach which rejected the predominant emphasis on politics, diplomacy and war of many 19th and early 20th-century historians as spearheaded by historians whom Febvre called Les Sorbonnistes. Instead, they pioneered an approach to a study of long-term historical structures (la longue durée) over events and political transformations. Geography, material culture, and what later Annalistes called mentalités, or the psychology of the epoch, are also characteristic areas of study. The goal of the Annales was to undo the work of the Sorbonnistes, to turn French historians away from the narrowly political and diplomatic toward the new vistas in social and economic history. Co-founder Marc Bloch (1886–1944) was a quintessential modernist who studied at the elite École Normale Supérieure, and in Germany, serving as a professor at the University of Strasbourg until he was called to the Sorbonne in Paris in 1936 as professor of economic history. Bloch's interests were highly interdisciplinary, influenced by the geography of Paul Vidal de la Blache (1845–1918) and the sociology of Émile Durkheim (1858–1917). His own ideas, especially those expressed in his masterworks, French Rural History (Les caractères originaux de l'histoire rurale française, 1931) and Feudal Society, were incorporated by the second-generation Annalistes, led by Fernand Braudel. Precepts Georges Duby, a leader of the school, wrote that the history he taught: relegated the sensational to the sidelines and was reluctant to give a simple accounting of events, but strove on the contrary to pose and solve problems and, neglecting surface disturbances, to observe the long and medium-term evolution of economy, society and civilisation. The Annalistes, especially Lucien Febvre, advocated a histoire totale, or histoire tout court, a complete study of a historic problem. Postwar Bloch was shot by the Gestapo during the German occupation of France in World War II for his active membership of the French Resistance, and Febvre carried on the Annales approach in the 1940s and 1950s. It was during this time that he mentored Braudel, who would become one of the best-known exponents of this school. Braudel's work came to define a "second" era of Annales historiography and was very influential throughout the 1960s and 1970s, especially for his work on the Mediterranean region in the era of Philip II of Spain. Braudel developed the idea, often associated with Annalistes, of different modes of historical time: l'histoire quasi immobile (the quasi motionless history) of historical geography, the history of social, political and economic structures (la longue durée), and the history of men and events, in the context of their structures. While authors such as Emmanuel Le Roy Ladurie, Marc Ferro and Jacques Le Goff continue to carry the Annales banner, today the Annales approach has been less distinctive as more and more historians do work in cultural history, political history and economic history. Mentalités Bloch's Les Rois Thaumaturges (1924) looked at the long-standing folk belief that the king could cure scrofula by his thaumaturgic touch. The kings of France and England indeed regularly practiced the ritual. Bloch was not concerned with the effectiveness of the royal touch—he acted instead like an anthropologist in asking why people believed it and how it shaped relations between king and commoner. The book was highly influential in introducing comparative studies (in this case France and England), as well as long durations ("longue durée") studies spanning several centuries, even up to a thousand years, downplaying short-term events. Bloch's revolutionary charting of mentalities, or mentalités, resonated with scholars who were reading Freud and Proust. In the 1960s, Robert Mandrou and Georges Duby harmonized the concept of mentalité history with Fernand Braudel's structures of historical time and linked mentalities with changing social conditions. A flood of mentalité studies based on these approaches appeared during the 1970s and 1980s. By the 1990s, however, mentalité history had become interdisciplinary to the point of fragmentation, but still lacked a solid theoretical basis. While not explicitly rejecting mentalité history, younger historians increasingly turned to other approaches. Braudel Fernand Braudel became the leader of the second generation after 1945. He obtained funding from the Rockefeller Foundation in New York and founded the 6th Section of the Ecole Pratique des Hautes Etudes, which was devoted to the study of history and the social sciences. It became an independent degree-granting institution in 1975 under the name École des Hautes Études en Sciences Sociales (EHESS). Braudel's followers admired his use of the longue durée approach to stress slow, and often imperceptible effects of space, climate and technology on the actions of human beings in the past. The Annales historians, after living through two world wars and incredible political upheavals in France, were deeply uncomfortable with the notion that multiple ruptures and discontinuities created history. They preferred to stress inertia and the longue durée. Special attention was paid to geography, climate, and demography as long-term factors. They believed the continuities of the deepest structures were central to history, beside which upheavals in institutions or the superstructure of social life were of little significance, for history lies beyond the reach of conscious actors, especially the will of revolutionaries. They rejected the Marxist idea that history should be used as a tool to foment and foster revolutions. In turn the Marxists called them conservatives. Braudel's first book, La Méditerranée et le Monde Méditerranéen à l'Epoque de Philippe II (1949) (The Mediterranean and the Mediterranean World in the Age of Philip II) was his most influential. This vast panoramic view used ideas from other social sciences, employed effectively the technique of the longue durée, and downplayed the importance of specific events and individuals. It stressed geography but not mentalité. It was widely admired, but most historians did not try to replicate it and instead focused on their specialized monographs. The book dramatically raised the worldwide profile of the Annales School. Regionalism Before Annales, French history supposedly happened in Paris. Febvre broke decisively with this paradigm in 1912, with his sweeping doctoral thesis on Philippe II et la Franche-Comté. The geography and social structure of this region overwhelmed and shaped the king's policies. The Annales historians did not try to replicate Braudel's vast geographical scope in La Méditerranée. Instead they focused on regions in France over long stretches of time. The most important was the study of the Peasants of Languedoc by Braudel's star pupil and successor Emmanuel Le Roy Ladurie. The regionalist tradition flourished especially in the 1960s and 1970s in the work of Pierre Goubert in 1960 on Beauvais and René Baehrel on Basse-Provence. Annales historians in the 1970s and 1980s turned to urban regions, including Pierre Deyon (Amiens), Maurice Garden (Lyon), Jean-Pierre Bardet (Rouen), Georges Freche (Toulouse), Gregory Hanlon (Agen and Layrac), and Jean-Claude Perrot (Caen). By the 1970s the shift was underway from the earlier economic history to cultural history and the history of mentalities. Impact outside France The Annales school systematically reached out to create an impact on other countries. Its success varied widely. The Annales approach was especially well received in Italy and Poland. Franciszek Bujak (1875–1953) and Jan Rutkowski (1886–1949), the founders of modern economic history in Poland and of the journal Roczniki Dziejów Spolecznych i Gospodarczych (1931– ), were attracted to the innovations of the Annales school. Rutkowski was in contact with Bloch and others, and published in the Annales. After the Communists took control in the 1940s Polish scholars were safer working on the Middle Ages and the early modern era rather than contemporary history. After the "Polish October" of 1956 the Sixth Section in Paris welcomed Polish historians and exchanges between the circle of the Annales and Polish scholars continued until the early 1980s. The reciprocal influence between the French school and Polish historiography was particularly evident in studies on the Middle Ages and the early modern era studied by Braudel. In South America the Annales approach became popular. From the 1950s Federico Brito Figueroa was the founder of a new Venezuelan historiography based largely on the ideas of the Annales School. Brito Figueroa carried his conception of the field to all levels of university study, emphasizing a systematic and scientific approach to history and placing it squarely in the social sciences. Spanish historiography was influenced by the "Annales School" starting in 1950 with Jaime Vincens Vives (1910–1960). In Mexico, exiled Republican intellectuals extended the Annales approach, particularly from the Center for Historical Studies of El Colegio de México, the leading graduate studies institution of Latin America. British historians, apart from a few Marxists, were generally hostile. Academic historians decidedly sided with Geoffrey Elton's The Practice of History against Edward Hallett Carr's What Is History? One of the few British historians who were sympathetic towards the work of the Annales school was Hugh Trevor-Roper. American, German, Indian, Russian and Japanese scholars generally ignored the school. The Americans developed their own form of "new social history" from entirely different roots. Both the American and the Annales historians picked up important family reconstitution techniques from French demographer Louis Henry. The Wageningen school centered on Bernard Slicher van Bath was viewed internationally as a Dutch counterpart of the Annales school, although Slicher van Bath himself vehemently rejected the idea of a quantitative "school" of historiography. Has been cited as a key influence in the development of World Systems Theory by sociologist Immanuel Wallerstein. Current The current leader is Roger Chartier, who is Directeur d'Études at the École des Hautes Études en Sciences Sociales in Paris, Professeur in the Collège de France, and Annenberg Visiting Professor of History at the University of Pennsylvania. He frequently lectures and teaches in the United States, Spain, Mexico, Brazil and Argentina. His work in Early Modern European History focuses on the history of education, the history of the book and the history of reading. Recently, he has been concerned with the relationship between written culture as a whole and literature (particularly theatrical plays) for France, England and Spain. His work in this specific field (based on the criss-crossing between literary criticism, bibliography, and sociocultural history) is connected to broader historiographical and methodological interests which deal with the relation between history and other disciplines: philosophy, sociology, anthropology. Chartier's typical undergraduate course focuses upon the making, remaking, dissemination, and reading of texts in early modern Europe and America. Under the heading of "practices," his class considers how readers read and marked up their books,

59–61.</ref> An attempt to require an Annales-written textbook for French schools was rejected by the government. By 1980 postmodern sensibilities undercut confidence in overarching metanarratives. As Jacques Revel notes, the success of the Annales school, especially its use of social structures as explanatory forces, contained the seeds of its own downfall, for there is "no longer any implicit consensus on which to base the unity of the social, identified with the real." The Annales school kept its infrastructure, but lost its mentalités. The journal The journal began in Strasbourg as Annales d'histoire économique et sociale; it moved to Paris and kept the same name from 1929 to 1939. It was successively renamed Annales d'histoire sociale (1939–1942, 1945), Mélanges d'histoire sociale (1942–1944), Annales. Economies, sociétés, civilisations (1946–1994), and Annales. Histoire, Sciences Sociales (1994– ). In 1962, Braudel and Gaston Berger used Ford Foundation money and government funds to create a new independent foundation, the (FMSH), which Braudel directed from 1970 until his death. In 1970, the 6th Section and the Annales relocated to the FMSH building. FMSH set up elaborate international networks to spread the Annales gospel across Europe and the world. In 2013, it began publication of an English language edition, with all the articles translated. The scope of topics covered by the journal is vast and experimental—there is a search for total history and new approaches. The emphasis is on social history, and very long-term trends, often using quantification and paying special attention to geography and to the intellectual world view of common people, or "mentality" (mentalité). Little attention is paid to political, diplomatic, or military history, or to biographies of famous men. Instead the Annales focused attention on the synthesizing of historical patterns identified from social, economic, and cultural history, statistics, medical reports, family studies, and even psychoanalysis. Origins The Annales was founded and edited by Marc Bloch and Lucien Febvre in 1929, while they were teaching at the University of Strasbourg and later in Paris. These authors, the former a medieval historian and the latter an early modernist, quickly became associated with the distinctive Annales approach, which combined geography, history, and the sociological approaches of the Année Sociologique (many members of which were their colleagues at Strasbourg) to produce an approach which rejected the predominant emphasis on politics, diplomacy and war of many 19th and early 20th-century historians as spearheaded by historians whom Febvre called Les Sorbonnistes. Instead, they pioneered an approach to a study of long-term historical structures (la longue durée) over events and political transformations. Geography, material culture, and what later Annalistes called mentalités, or the psychology of the epoch, are also characteristic areas of study. The goal of the Annales was to undo the work of the Sorbonnistes, to turn French historians away from the narrowly political and diplomatic toward the new vistas in social and economic history. Co-founder Marc Bloch (1886–1944) was a quintessential modernist who studied at the elite École Normale Supérieure, and in Germany, serving as a professor at the University of Strasbourg until he was called to the Sorbonne in Paris in 1936 as professor of economic history. Bloch's interests were highly interdisciplinary, influenced by the geography of Paul Vidal de la Blache (1845–1918) and the sociology of Émile Durkheim (1858–1917). His own ideas, especially those expressed in his masterworks, French Rural History (Les caractères originaux de l'histoire rurale française, 1931) and Feudal Society, were incorporated by the second-generation Annalistes, led by Fernand Braudel. Precepts Georges Duby, a leader of the school, wrote that the history he taught: relegated the sensational to the sidelines and was reluctant to give a simple accounting of events, but strove on the contrary to pose and solve problems and, neglecting surface disturbances, to observe the long and medium-term evolution of economy, society and civilisation. The Annalistes, especially Lucien Febvre, advocated a histoire totale, or histoire tout court, a complete study of a historic problem. Postwar Bloch was shot by the Gestapo during the German occupation of France in World War II for his active membership of the French Resistance, and Febvre carried on the Annales approach in the 1940s and 1950s. It was during this time that he mentored Braudel, who would become one of the best-known exponents of this school. Braudel's work came to define a "second" era of Annales historiography and was very influential throughout the 1960s and 1970s, especially for his work on the Mediterranean region in the era of Philip II of Spain. Braudel developed the idea, often associated with Annalistes, of different modes of historical time: l'histoire quasi immobile (the quasi motionless history) of historical geography, the history of social, political and economic structures (la longue durée), and the history of men and events, in the context of their structures. While authors such as Emmanuel Le Roy Ladurie, Marc Ferro and Jacques Le Goff continue to carry the Annales banner, today the Annales approach has been less distinctive as more and more historians do work in cultural history, political history and economic history. Mentalités Bloch's Les Rois Thaumaturges (1924) looked at the long-standing folk belief that the king could cure scrofula by his thaumaturgic touch. The kings of France and England indeed regularly practiced the ritual. Bloch was not concerned with the effectiveness of the royal touch—he acted instead like an anthropologist in asking why people believed it and how it shaped relations between king and commoner. The book was highly influential in introducing comparative studies (in this case France and England), as well as long durations ("longue durée") studies spanning several centuries, even up to a thousand years, downplaying short-term events. Bloch's revolutionary charting of mentalities, or mentalités, resonated with scholars who were reading Freud and Proust. In the 1960s, Robert Mandrou and Georges Duby harmonized the concept of mentalité history with Fernand Braudel's structures of historical time and linked mentalities with changing social conditions. A flood of mentalité studies based on these approaches appeared during the 1970s and 1980s. By the 1990s, however, mentalité history had become interdisciplinary to the point of fragmentation, but still lacked a solid theoretical basis. While not explicitly rejecting mentalité history, younger historians increasingly turned to other approaches. Braudel Fernand Braudel became the leader of the second generation after 1945. He obtained funding from the Rockefeller Foundation in New York and founded the 6th Section of the Ecole Pratique des Hautes Etudes, which was devoted to the study of history and the social sciences. It became an independent degree-granting institution in 1975 under the name École des Hautes Études en Sciences Sociales (EHESS). Braudel's followers admired his use of the longue durée approach to stress slow, and often imperceptible effects of space, climate and technology on the actions of human beings in the past. The Annales historians, after living through two world wars and incredible political upheavals in France, were deeply uncomfortable with the notion that multiple ruptures and discontinuities created history. They preferred to stress inertia and the longue durée. Special attention was paid to geography, climate, and demography as long-term factors. They believed the continuities of the deepest structures were central to history, beside which upheavals in institutions or the superstructure of social life were of little significance, for history lies beyond the reach of conscious actors, especially the will of revolutionaries. They rejected the Marxist idea that history should be used as a tool to foment and foster revolutions. In turn the Marxists called them conservatives. Braudel's first book, La Méditerranée et le Monde Méditerranéen à l'Epoque de Philippe II (1949) (The Mediterranean and the Mediterranean World in the Age of Philip II) was his most influential. This vast panoramic view used ideas from other social sciences, employed effectively the technique of the longue durée, and downplayed the importance of specific events and individuals. It stressed geography but not mentalité. It was widely admired, but most historians did not try to replicate it and instead focused on their specialized monographs. The book dramatically raised the worldwide profile of the Annales School. Regionalism Before Annales, French history supposedly happened in Paris. Febvre broke decisively with this paradigm in 1912, with his sweeping doctoral thesis on Philippe II et la Franche-Comté. The geography and social structure of this region overwhelmed and shaped the king's policies. The Annales historians did not try to replicate Braudel's vast geographical scope in La Méditerranée. Instead they focused on regions in France over long stretches of time. The most important was the study of the Peasants of Languedoc by Braudel's star pupil and successor Emmanuel Le Roy Ladurie. The regionalist tradition flourished especially in the 1960s and 1970s in the work of Pierre Goubert in 1960 on Beauvais and René Baehrel on Basse-Provence. Annales historians in the 1970s and 1980s turned to urban regions, including Pierre Deyon (Amiens), Maurice Garden (Lyon), Jean-Pierre Bardet (Rouen), Georges Freche (Toulouse), Gregory Hanlon (Agen and Layrac), and Jean-Claude Perrot (Caen). By the 1970s the shift was underway from the earlier economic history to cultural history and the history

January 2011, research by the American Astronomical Society discovered antimatter (positrons) originating above thunderstorm clouds; positrons are produced in terrestrial gamma-ray flashes created by electrons accelerated by strong electric fields in the clouds. Antiprotons have also been found to exist in the Van Allen Belts around the Earth by the PAMELA module. Antiparticles are also produced in any environment with a sufficiently high temperature (mean particle energy greater than the pair production threshold). It is hypothesized that during the period of baryogenesis, when the universe was extremely hot and dense, matter and antimatter were continually produced and annihilated. The presence of remaining matter, and absence of detectable remaining antimatter, is called baryon asymmetry. The exact mechanism that produced this asymmetry during baryogenesis remains an unsolved problem. One of the necessary conditions for this asymmetry is the violation of CP symmetry, which has been experimentally observed in the weak interaction. Recent observations indicate black holes and neutron stars produce vast amounts of positron-electron plasma via the jets. Observation in cosmic rays Satellite experiments have found evidence of positrons and a few antiprotons in primary cosmic rays, amounting to less than 1% of the particles in primary cosmic rays. This antimatter cannot all have been created in the Big Bang, but is instead attributed to have been produced by cyclic processes at high energies. For instance, electron-positron pairs may be formed in pulsars, as a magnetized neutron star rotation cycle shears electron-positron pairs from the star surface. Therein the antimatter forms a wind that crashes upon the ejecta of the progenitor supernovae. This weathering takes place as "the cold, magnetized relativistic wind launched by the star hits the non-relativistically expanding ejecta, a shock wave system forms in the impact: the outer one propagates in the ejecta, while a reverse shock propagates back towards the star." The former ejection of matter in the outer shock wave and the latter production of antimatter in the reverse shock wave are steps in a space weather cycle. Preliminary results from the presently operating Alpha Magnetic Spectrometer (AMS-02) on board the International Space Station show that positrons in the cosmic rays arrive with no directionality, and with energies that range from 10 GeV to 250 GeV. In September, 2014, new results with almost twice as much data were presented in a talk at CERN and published in Physical Review Letters. A new measurement of positron fraction up to 500 GeV was reported, showing that positron fraction peaks at a maximum of about 16% of total electron+positron events, around an energy of 275 ± 32 GeV. At higher energies, up to 500 GeV, the ratio of positrons to electrons begins to fall again. The absolute flux of positrons also begins to fall before 500 GeV, but peaks at energies far higher than electron energies, which peak about 10 GeV. These results on interpretation have been suggested to be due to positron production in annihilation events of massive dark matter particles. Cosmic ray antiprotons also have a much higher energy than their normal-matter counterparts (protons). They arrive at Earth with a characteristic energy maximum of 2 GeV, indicating their production in a fundamentally different process from cosmic ray protons, which on average have only one-sixth of the energy. There is an ongoing search for larger antimatter nuclei, such as antihelium nuclei (that is, anti-alpha particles), in cosmic rays. The detection of natural antihelium could imply the existence of large antimatter structures such as an antistar. A prototype of the AMS-02 designated AMS-01, was flown into space aboard the on STS-91 in June 1998. By not detecting any antihelium at all, the AMS-01 established an upper limit of 1.1×10−6 for the antihelium to helium flux ratio. AMS-02 revealed in December 2016 that it had discovered a few signals consistent with antihelium nuclei amidst several billion helium nuclei. The result remains to be verified, and the team is currently trying to rule out contamination. Artificial production Positrons Positrons were reported in November 2008 to have been generated by Lawrence Livermore National Laboratory in larger numbers than by any previous synthetic process. A laser drove electrons through a gold target's nuclei, which caused the incoming electrons to emit energy quanta that decayed into both matter and antimatter. Positrons were detected at a higher rate and in greater density than ever previously detected in a laboratory. Previous experiments made smaller quantities of positrons using lasers and paper-thin targets; newer simulations showed that short bursts of ultra-intense lasers and millimeter-thick gold are a far more effective source. Antiprotons, antineutrons, and antinuclei The existence of the antiproton was experimentally confirmed in 1955 by University of California, Berkeley physicists Emilio Segrè and Owen Chamberlain, for which they were awarded the 1959 Nobel Prize in Physics. An antiproton consists of two up antiquarks and one down antiquark (). The properties of the antiproton that have been measured all match the corresponding properties of the proton, with the exception of the antiproton having opposite electric charge and magnetic moment from the proton. Shortly afterwards, in 1956, the antineutron was discovered in proton–proton collisions at the Bevatron (Lawrence Berkeley National Laboratory) by Bruce Cork and colleagues. In addition to antibaryons, anti-nuclei consisting of multiple bound antiprotons and antineutrons have been created. These are typically produced at energies far too high to form antimatter atoms (with bound positrons in place of electrons). In 1965, a group of researchers led by Antonino Zichichi reported production of nuclei of antideuterium at the Proton Synchrotron at CERN. At roughly the same time, observations of antideuterium nuclei were reported by a group of American physicists at the Alternating Gradient Synchrotron at Brookhaven National Laboratory. Antihydrogen atoms In 1995, CERN announced that it had successfully brought into existence nine hot antihydrogen atoms by implementing the SLAC/Fermilab concept during the PS210 experiment. The experiment was performed using the Low Energy Antiproton Ring (LEAR), and was led by Walter Oelert and Mario Macri. Fermilab soon confirmed the CERN findings by producing approximately 100 antihydrogen atoms at their facilities. The antihydrogen atoms created during PS210 and subsequent experiments (at both CERN and Fermilab) were extremely energetic and were not well suited to study. To resolve this hurdle, and to gain a better understanding of antihydrogen, two collaborations were formed in the late 1990s, namely, ATHENA and ATRAP. In 1999, CERN activated the Antiproton Decelerator, a device capable of decelerating antiprotons from to – still too "hot" to produce study-effective antihydrogen, but a huge leap forward. In late 2002 the ATHENA project announced that they had created the world's first "cold" antihydrogen. The ATRAP project released similar results very shortly thereafter. The antiprotons used in these experiments were cooled by decelerating them with the Antiproton Decelerator, passing them through a thin sheet of foil, and finally capturing them in a Penning–Malmberg trap. The overall cooling process is workable, but highly inefficient; approximately 25 million antiprotons leave the Antiproton Decelerator and roughly 25,000 make it to the Penning–Malmberg trap, which is about or 0.1% of the original amount. The antiprotons are still hot when initially trapped. To cool them further, they are mixed into an electron plasma. The electrons in this plasma cool via cyclotron radiation, and then sympathetically cool the antiprotons via Coulomb collisions. Eventually, the electrons are removed by the application of short-duration electric fields, leaving the antiprotons with energies less than . While the antiprotons are being cooled in the first trap, a small cloud of positrons is captured from radioactive sodium in a Surko-style positron accumulator. This cloud is then recaptured in a second trap near the antiprotons. Manipulations of the trap electrodes then tip the antiprotons into the positron plasma, where some combine with antiprotons to form antihydrogen. This neutral antihydrogen is unaffected by the electric and magnetic fields used to trap the charged positrons and antiprotons, and within a few microseconds the antihydrogen hits the trap walls, where it annihilates. Some hundreds of millions of antihydrogen atoms have been made in this fashion. In 2005, ATHENA disbanded and some of the former members (along with others) formed the ALPHA Collaboration, which is also based at CERN. The ultimate goal of this endeavour is to test CPT symmetry through comparison of the atomic spectra of hydrogen and antihydrogen (see hydrogen spectral series). In 2016, a new antiproton decelerator and cooler called ELENA (Extra Low ENergy Antiproton decelerator) was built. It takes the antiprotons from the antiproton decelerator and cools them to 90 keV, which is "cold" enough to study. This machine works by using high energy and accelerating the particles within the chamber. More than one hundred antiprotons can be captured per second, a huge improvement, but it would still take several thousand years to make a nanogram of antimatter. Most of the sought-after high-precision tests of the properties of antihydrogen could only be performed if the antihydrogen were trapped, that is, held in place for a relatively long time. While antihydrogen atoms are electrically neutral, the spins of their component particles produce a magnetic moment. These magnetic moments can interact with an inhomogeneous magnetic field; some of the antihydrogen atoms can be attracted to a magnetic minimum. Such a minimum can be created by a combination of mirror and multipole fields. Antihydrogen can be trapped in such a magnetic minimum (minimum-B) trap; in November 2010, the ALPHA collaboration announced that they had so trapped 38 antihydrogen atoms for about a sixth of a second. This was the first time that neutral antimatter had been trapped. On 26 April 2011, ALPHA announced that they had trapped 309 antihydrogen atoms, some for as long as 1,000 seconds (about 17 minutes). This was longer than neutral antimatter had ever been trapped before. ALPHA has used these trapped atoms to initiate research into the spectral properties of the antihydrogen. The biggest limiting factor in the large-scale production of antimatter is the availability of antiprotons. Recent data released by CERN states that, when fully operational, their facilities are capable of producing ten million antiprotons per minute. Assuming a 100% conversion of antiprotons to antihydrogen, it would take 100 billion years to produce 1 gram or 1 mole of antihydrogen (approximately atoms of anti-hydrogen). However, CERN only produces 1% of the anti-matter Fermilab does, and neither are designed to produce anti-matter. According to Gerald Jackson, using technology already in use today we are capable of producing and capturing 20 grams of anti-matter particles per year at a yearly cost of 670 million dollars per facility. Antihelium Antihelium-3

its corresponding antiparticle must have identical masses and decay lifetimes (if unstable). It also implies that, for example, a star made up of antimatter (an "antistar") will shine just like an ordinary star. This idea was tested experimentally in 2016 by the ALPHA experiment, which measured the transition between the two lowest energy states of antihydrogen. The results, which are identical to that of hydrogen, confirmed the validity of quantum mechanics for antimatter. Origin and asymmetry Most matter observable from the Earth seems to be made of matter rather than antimatter. If antimatter-dominated regions of space existed, the gamma rays produced in annihilation reactions along the boundary between matter and antimatter regions would be detectable. Antiparticles are created everywhere in the universe where high-energy particle collisions take place. High-energy cosmic rays impacting Earth's atmosphere (or any other matter in the Solar System) produce minute quantities of antiparticles in the resulting particle jets, which are immediately annihilated by contact with nearby matter. They may similarly be produced in regions like the center of the Milky Way and other galaxies, where very energetic celestial events occur (principally the interaction of relativistic jets with the interstellar medium). The presence of the resulting antimatter is detectable by the two gamma rays produced every time positrons annihilate with nearby matter. The frequency and wavelength of the gamma-rays indicate that each carries 511 keV of energy (that is, the rest mass of an electron multiplied by c2). Observations by the European Space Agency's INTEGRAL satellite may explain the origin of a giant antimatter cloud surrounding the galactic center. The observations show that the cloud is asymmetrical and matches the pattern of X-ray binaries (binary star systems containing black holes or neutron stars), mostly on one side of the galactic center. While the mechanism is not fully understood, it is likely to involve the production of electron–positron pairs, as ordinary matter gains kinetic energy while falling into a stellar remnant. Antimatter may exist in relatively large amounts in far-away galaxies due to cosmic inflation in the primordial time of the universe. Antimatter galaxies, if they exist, are expected to have the same chemistry and absorption and emission spectra as normal-matter galaxies, and their astronomical objects would be observationally identical, making them difficult to distinguish. NASA is trying to determine if such galaxies exist by looking for X-ray and gamma-ray signatures of annihilation events in colliding superclusters. In October 2017, scientists working on the BASE experiment at CERN reported a measurement of the antiproton magnetic moment to a precision of 1.5 parts per billion. It is consistent with the most precise measurement of the proton magnetic moment (also made by BASE in 2014), which supports the hypothesis of CPT symmetry. This measurement represents the first time that a property of antimatter is known more precisely than the equivalent property in matter. Antimatter quantum interferometry has been first demonstrated in the L-NESS Laboratory of R. Ferragut in Como (Italy), by a group led by M. Giammarchi. Natural production Positrons are produced naturally in β+ decays of naturally occurring radioactive isotopes (for example, potassium-40) and in interactions of gamma quanta (emitted by radioactive nuclei) with matter. Antineutrinos are another kind of antiparticle created by natural radioactivity (β− decay). Many different kinds of antiparticles are also produced by (and contained in) cosmic rays. In January 2011, research by the American Astronomical Society discovered antimatter (positrons) originating above thunderstorm clouds; positrons are produced in terrestrial gamma-ray flashes created by electrons accelerated by strong electric fields in the clouds. Antiprotons have also been found to exist in the Van Allen Belts around the Earth by the PAMELA module. Antiparticles are also produced in any environment with a sufficiently high temperature (mean particle energy greater than the pair production threshold). It is hypothesized that during the period of baryogenesis, when the universe was extremely hot and dense, matter and antimatter were continually produced and annihilated. The presence of remaining matter, and absence of detectable remaining antimatter, is called baryon asymmetry. The exact mechanism that produced this asymmetry during baryogenesis remains an unsolved problem. One of the necessary conditions for this asymmetry is the violation of CP symmetry, which has been experimentally observed in the weak interaction. Recent observations indicate black holes and neutron stars produce vast amounts of positron-electron plasma via the jets. Observation in cosmic rays Satellite experiments have found evidence of positrons and a few antiprotons in primary cosmic rays, amounting to less than 1% of the particles in primary cosmic rays. This antimatter cannot all have been created in the Big Bang, but is instead attributed to have been produced by cyclic processes at high energies. For instance, electron-positron pairs may be formed in pulsars, as a magnetized neutron star rotation cycle shears electron-positron pairs from the star surface. Therein the antimatter forms a wind that crashes upon the ejecta of the progenitor supernovae. This weathering takes place as "the cold, magnetized relativistic wind launched by the star hits the non-relativistically expanding ejecta, a shock wave system forms in the impact: the outer one propagates in the ejecta, while a reverse shock propagates back towards the star." The former ejection of matter in the outer shock wave and the latter production of antimatter in the reverse shock wave are steps in a space weather cycle. Preliminary results from the presently operating Alpha Magnetic Spectrometer (AMS-02) on board the International Space Station show that positrons in the cosmic rays arrive with no directionality, and with energies that range from 10 GeV to 250 GeV. In September, 2014, new results with almost twice as much data were presented in a talk at CERN and published in Physical Review Letters. A new measurement of positron fraction up to 500 GeV was reported, showing that positron fraction peaks at a maximum of about 16% of total electron+positron events, around an energy of 275 ± 32 GeV. At higher energies, up to 500 GeV, the ratio of positrons to electrons begins to fall again. The absolute flux of positrons also begins to fall before 500 GeV, but peaks at energies far higher than electron energies, which peak about 10 GeV. These results on interpretation have been suggested to be due to positron production in annihilation events of massive dark matter particles. Cosmic ray antiprotons also have a much higher energy than their normal-matter counterparts (protons). They arrive at Earth with a characteristic energy maximum of 2 GeV, indicating their production in a fundamentally different process from cosmic ray protons, which on average have only one-sixth of the energy. There is an ongoing search for larger antimatter nuclei, such as antihelium nuclei (that is, anti-alpha particles), in cosmic rays. The detection of natural antihelium could imply the existence of large antimatter structures such as an antistar. A prototype of the AMS-02 designated AMS-01, was flown into space aboard the on STS-91 in June 1998. By not detecting any antihelium at all, the AMS-01 established an upper limit of 1.1×10−6 for the antihelium to helium flux ratio. AMS-02 revealed in December 2016 that it had discovered a few signals consistent with antihelium nuclei amidst several billion helium nuclei. The result remains to be verified, and the team is currently trying to rule out contamination. Artificial production Positrons Positrons were reported in November 2008 to have been generated by Lawrence Livermore National Laboratory in larger numbers than by any previous synthetic process. A laser drove electrons through a gold target's nuclei, which caused the incoming electrons to emit energy quanta that decayed into both matter and antimatter. Positrons were detected at a higher rate and in greater density than ever previously detected in a laboratory. Previous experiments made smaller quantities of positrons using lasers and paper-thin targets; newer simulations showed that short bursts of ultra-intense lasers and millimeter-thick gold are a far more effective source. Antiprotons, antineutrons, and antinuclei The existence of the antiproton was experimentally confirmed in 1955 by

to the left of centre, terminating at the top in a turret and cross, represents the lance of Saint George (patron saint of Catalonia, Gaudí's home), which has been plunged into the back of the dragon. In 2005, Casa Batlló became an UNESCO World Heritage Site among the other Works of Antoni Gaudí, and is visited by people from around the world. History Initial construction (1877) The building that is now Casa Batlló was built in 1877, commissioned by Lluís Sala Sánchez. It was a classical building without remarkable characteristics within the eclecticism traditional by the end of the 19th century. The building had a basement, a ground floor, four other floors and a garden in the back. Batlló family The house was bought by Josep Batlló in 1903. The design of the house made the home undesirable to buyers but the Batlló family decided to buy the place due to its centralized location. It is located in the middle of Passeig de Gràcia, which in the early 20th century was known as a very prestigious and fashionable area. It was an area where the prestigious family could draw attention to themselves. In 1906, Josep Batlló still owned the home. The Batlló family was very well known in Barcelona for its contribution to the textile industry in the city. Mr. Josep Batlló i Casanovas was a textile industrialist who owned a few factories in the city. Mr. Batlló married Amàlia Godó Belaunzarán, from the family that founded the newspaper La Vanguardia. Josep wanted an architect that would design a house that was like no other and stood out as being audacious and creative. Both Josep and his wife were open to anything and they decided not to limit Gaudí. Josep did not want his house to resemble any of the houses of the rest of the Batlló family, such as Casa Pía, built by the Josep Vilaseca. He chose the architect who had designed Park Güell because he wanted him to come up with a risky plan. The family lived on the Noble Floor of Casa Batlló until the middle of the 1950s. Renovation (1904-1906) In 1904, Josep Batlló hired Gaudí to design his home; at first his plans were to tear down the building and construct a completely new house. Gaudí convinced Josep that a renovation was sufficient and was also able to submit the planning application the same year. The building was completed and refurbished in 1906. He completely changed the main apartment which became the residence for the Batlló family. He expanded the central well in order to supply light to the whole building and also added new floors. In the same year the Barcelona City Council selected the house as a candidate for that year's best building award. The award was given to another architect that year despite Gaudí's design. Refurbishments Josep Batlló died in 1934 and the house was kept in order by the wife until her death in 1940 . After the death of the two parents, the house was kept and managed by the children until 1954. In 1954, an insurance company named Seguros Iberia acquired Casa Batlló and set up offices there. In 1970, the first refurbishment occurred mainly in several of the interior rooms of the house. In 1983, the exterior balconies were restored to their original colour and a year later the exterior façade was illuminated in the ceremony of La Mercè. Multiple uses In 1993, the current owners of Casa Batlló bought the home and continued refurbishments throughout the whole building. Two years later, in 1995, Casa Batlló began to hire out its facilities for different events. More than 2,500 square meters of rooms within the building were rented out for many different functions. Due to the building's location and the beauty of the facilities being rented, the rooms of Casa Batlló were in very high demand and hosted many important events for the city. Design Overview

side is Mr. Batlló's study, a dining room, and a secluded spot for courting couples, decorated with a mushroom-shaped fireplace. The elaborate and animal-like décor continues throughout the whole noble floor. In 2002, the house opened its doors to the public, and people were allowed to visit the noble floor. The building was opened to the public as part of the celebration of the International Year of Gaudí. Casa Batlló met with very much unanticipated success, and visitors became eager to see the rest of the house. Two years later, in celebration of the one hundredth anniversary of the beginning of work on Casa Batlló, the fifth floor was restored and the house extended its visit to the loft and the well. In 2005, Casa Batlló became a UNESCO World Heritage Site. Roof The roof terrace is one of the most popular features of the entire house due to its famous dragon back design. Gaudí represents an animal's spine by using tiles of different colors on one side. The roof is decorated with four chimney stacks, that are designed to prevent backdraughts. Exterior façade The façade has three distinct sections which are harmoniously integrated. The lower ground floor with the main floor and two first-floor galleries are contained in a structure of Montjuïc sandstone with undulating lines. The central part, which reaches the last floor, is a multicolored section with protruding balconies. The top of the building is a crown, like a huge gable, which is at the same level as the roof and helps to conceal the room where there used to be water tanks. This room is currently empty. The top displays a trim with ceramic pieces that has attracted multiple interpretations. Roof tiles The roof's arched profile recalls the spine of a dragon with ceramic tiles for scales, and a small triangular window towards the right of the structure simulates the eye. Legend has it that it was once possible to see the Sagrada Família through this window, which was being built simultaneously. The view of the Sagrada Família is now blocked from this vantage point by newer buildings. The tiles were given a metallic sheen to simulate the varying scales of the monster, with the color grading from green on the right side, where the head begins, to deep blue and violet in the center, to red and pink on the left side of the building. Tower and bulb One of the highlights of the façade is a tower topped with a cross of four arms oriented to the cardinal directions. It is a bulbous, root-like structure that evokes plant life. There is a second bulb-shaped structure similarly reminiscent of a thalamus flower, which is represented by a cross with arms that are actually buds announcing the next flowering. The tower is decorated with monograms of Jesus (JHS), Maria (M with the ducal crown) and Joseph (JHP), made of ceramic pieces that stand out golden on the green background that covers the façade. These symbols show the deep religiosity of Gaudí, who was inspired by the contemporaneous construction of his basilica to choose the theme of the holy family. The bulb was broken when it was delivered, perhaps during transportation. Although the manufacturer committed to re-do the broken parts, Gaudí liked the aesthetic of the broken masonry and asked that the pieces be stuck to the main structure with lime mortar and held in with a brass ring. Central section The central part of the façade evokes the surface of a lake with water lilies, reminiscent of Monet's Nymphéas, with gentle ripples and reflections caused by the glass and ceramic mosaic. It is a great undulating surface covered with plaster fragments of colored glass discs combined with 330 rounds of polychrome pottery. The discs were designed by Gaudí and Jujol between tests during their stay in Majorca, while working on the restoration of the Cathedral of Palma. Balcony Finally, above the central part of the façade is a smaller balcony, also iron, with a different exterior aesthetic, closer to a local type of lily. Two iron arms were installed here to support a pulley to raise and lower furniture. Main floor The façade of the main floor, made entirely in sandstone, and is supported by two columns. The design is complemented by joinery windows set with multicolored stained glass. In front of the large windows, as if they were pillars that support the complex stone structure, there are six fine columns that seem to simulate the bones of a limb, with an apparent central articulation; in fact, this is a floral decoration. The rounded shapes of the gaps and the lip-like edges carved into the stone surrounding them create a semblance of a fully open mouth, for which the Casa Batlló has been nicknamed the "house of yawns". The structure repeats on the first floor and in the design of two windows at the ends forming galleries, but on the large central window

philosophy. Specifically, many studies claim to see references to Freemasonry, despite the deep religious beliefs of both Gaudí and Count Güell. These references have not been proven in the historiography of the modern architect. The multiplicity of symbols found in the Park Güell is, as previously mentioned, associated to political and religious signs, with a touch of mystery according to the preferences of that time for enigmas and puzzles. Origins as a housing development The park was originally part of a commercially unsuccessful housing site, the idea of Count Eusebi Güell, after whom the park was named. It was inspired by the English garden city movement; hence the original English name Park (in Catalan the name is "Parc Güell"). The site was a rocky hill with little vegetation and few trees, called Muntanya Pelada (Bare Mountain). It already included a large country house called Larrard House or Muntaner de Dalt House and was next to a neighbourhood of upper-class houses called La Salut (The Health). The intention was to exploit the fresh air (well away from smoky factories) and beautiful views from the site, with sixty triangular lots being provided for luxury houses. Count Eusebi Güell added to the prestige of the development by moving in 1906 to live in Larrard House. Ultimately, only two houses were built, neither designed by Gaudí. One was intended to be a show house, but on being completed in 1904 was put up for sale, and as no buyers came forward, Gaudí, at Güell's suggestion, bought it with his savings and moved in with his family and his father in 1906. This house, where Gaudí lived from 1906 to 1926 (his death), was built by Francesc Berenguer in 1904. It contains original works by Gaudí and several of his collaborators. It is now the Gaudí House Museum (Casa Museu Gaudí) since 1963. In 1969, it was declared a historical artistic monument of national interest. Municipal garden It has since been converted into a municipal garden. It can be reached by underground railway (although the stations are at a distance from the Park and at a much lower level below the hill), by city buses, or by commercial tourist buses. Since October 2013 there is an entrance fee to visit the Monumental Zone (main entrance, terrace, and the parts containing mosaics), but the entrance to the Park remains free. Gaudí's house, "la Torre Rosa," – containing furniture that he designed – can be only visited for another entrance fee. There is a reduced rate for those wishing to see both Gaudí's house and the Sagrada Família Church. Park Güell is designed and composed to bring the peace and calm that one would expect from a park. The buildings flanking the entrance, though very original and remarkable with fantastically shaped roofs with unusual pinnacles, fit in well with the use of the park as pleasure gardens and seem relatively inconspicuous in the landscape when one considers the flamboyance of other buildings designed by Gaudí. These two buildings make up the Porter's Lodge pavilion. One of these buildings contains a small room with a telephone booth. The other, while once being the porter's house, is now a permanent exhibition of the Barcelona City History Museum MUHBA focused on the building itself, the park and the city. The focal point of the park is the main terrace, surrounded by a long bench in the form of a sea serpent. The curves of the serpent bench form a number of enclaves, creating a more social atmosphere. Gaudí incorporated many motifs of Catalan nationalism, and elements from religious mysticism and ancient poetry, into the Park. Much of the design of the benches was the work not of Gaudí but of his often overlooked collaborator Josep Maria Jujol. Roadways around the park to service the intended houses were designed by Gaudí as structures jutting out from the steep hillside or running on viaducts, with separate footpaths in arcades formed under these structures. This minimized the intrusion of the roads, and

apparently Güell and Gaudí's conception of the park was also inspired by the Temple of Apollo of Delphi. On the other hand, many experts have tried to link the park to various symbols because of the complex iconography that Gaudí applied to the urban project. Such references go from political vindication to religious exaltation, passing through mythology, history and philosophy. Specifically, many studies claim to see references to Freemasonry, despite the deep religious beliefs of both Gaudí and Count Güell. These references have not been proven in the historiography of the modern architect. The multiplicity of symbols found in the Park Güell is, as previously mentioned, associated to political and religious signs, with a touch of mystery according to the preferences of that time for enigmas and puzzles. Origins as a housing development The park was originally part of a commercially unsuccessful housing site, the idea of Count Eusebi Güell, after whom the park was named. It was inspired by the English garden city movement; hence the original English name Park (in Catalan the name is "Parc Güell"). The site was a rocky hill with little vegetation and few trees, called Muntanya Pelada (Bare Mountain). It already included a large country house called Larrard House or Muntaner de Dalt House and was next to a neighbourhood of upper-class houses called La Salut (The Health). The intention was to exploit the fresh air (well away from smoky factories) and beautiful views from the site, with sixty triangular lots being provided for luxury houses. Count Eusebi Güell added to the prestige of the development by moving in 1906 to live in Larrard House. Ultimately, only two houses were built, neither designed by Gaudí. One was intended to be a show house, but on being completed in 1904 was put up for sale, and as no buyers came forward, Gaudí, at Güell's suggestion, bought it with his savings and moved in with his family and his father in 1906. This house, where Gaudí lived from 1906 to 1926 (his death), was built by Francesc Berenguer in 1904. It contains original works by Gaudí and several of his collaborators. It is now the Gaudí House Museum (Casa Museu Gaudí) since 1963. In 1969, it was declared a historical artistic monument of national interest. Municipal garden It has since been converted into a municipal garden. It can be reached by underground railway (although the stations are at a distance from the Park and at a much lower level below the hill), by city buses, or by commercial tourist buses. Since October 2013 there is an entrance fee to visit the Monumental Zone (main entrance, terrace, and the parts containing mosaics), but the entrance to the Park remains free. Gaudí's house, "la Torre Rosa," – containing furniture that he designed – can be only visited for another entrance fee. There is a reduced rate

to inhabit the main floor, which the City Council authorized in October 1911, and the couple moved in. On October 31, 1912, Gaudí issued the certificate stating that, in accordance with his plans and his direction, the work had been completed and the whole house was ready to be rented. Critics and controversies The building did not respect any rules of conventional style, for which Gaudí received much criticism. To begin with, the name "La Pedrera" is in fact a nickname assigned by the citizens who disapproved of its unusualness. The unique structure of the building and the relationship between the building's architect and Pere Milà became the object of ridicule for the people of Barcelona and many humorous publications of the time. Catholic symbols Gaudí, a Catholic and a devotee of the Virgin Mary, planned for the Casa Milà to be a spiritual symbol. Overt religious elements include an excerpt from the Rosary on the cornice and planned statues of Mary, specifically Our Lady of the Rosary, and two archangels, St. Michael and St. Gabriel. However, the Casa Milà was not built entirely to Gaudí's specifications. The local government ordered the demolition of elements that exceeded the height standard for the city, and fined the Milàs for many infractions of building codes. After Semana Trágica, an outbreak of anticlericalism in the city, Milà prudently decided to forgo the religious statues. Gaudí contemplated abandoning the project but a priest persuaded him to continue. Change of ownership In 1940, Milà died. Segimon sold the property in 1946 for 18 million pesetas to Josep Ballvé i Pellisé, known for his department stores on , in partnership with the family of Pío Rubert Laporta. The Compañía Inmobiliaria Provenza, SA (CIPSA) was founded to administer the building. Roser Segimon continued to live on the main floor until her death in 1964. The new owners divided the first floor facing into five apartments instead of the original two. In 1953, they commissioned to convert 13 rubbish-filled attic laundry rooms to street-facing apartments, leaving a communal hallway on the side facing the courtyards. Some of these two or three room apartments had a loft and were designed and furnished in a typical early 1950s style using brick, ceramic and wood. Items of furniture, such as the , were reminiscent of Eero Saarinen's work. The insurance company Northern took over the main floor in 1966. By then, Casa Milà had housed a bingo hall, an academy and the offices of Cementos Molins and Inoxcrom among others. Maintenance costs were high and the owners had allowed the building to become dilapidated, causing stones to loosen in 1971. Josep Anton Comas made some emergency repairs, especially to the paintings in the courtyards, while respecting the original design. Restoration Gaudí's work was designated a historic and artistic monument on July 24, 1969. Casa Milà was in poor condition in the early 1980s. It had been painted a dreary brown and many of its interior color schemes had been abandoned or allowed to deteriorate, but it has been restored since and many of the original colors revived. In 1984, the building became part of a World Heritage Site encompassing some of Gaudí's works. The Barcelonan city council tried to rent the main floor as an office for the 1992 Olympic bid. Finally, the day before Christmas 1986, Caixa Catalunya bought La Pedrera for 900 million pesetas. On February 19, 1987, urgently needed work began on the restoration and cleaning of the façade. The work was done by the architects Joseph Emilio Hernández-Cros and Rafael Vila. The renovated main floor opened in 1990 as part of the Cultural Olympiad of Barcelona. The floor became an exhibition room with an example of modernism in the Eixample. Design The building is 1,323 m2 per floor on a plot of 1,620 m2. Gaudí made the first sketches in his workshop in the Sagrada Família. He designed the house as a constant curve, both outside and inside, incorporating ruled geometry and naturalistic elements. Casa Milà consists of two buildings, which are structured around two courtyards that provide light to the nine stories: basement, ground floor, mezzanine, main (or noble) floor, four upper floors, and an attic. The basement was intended to be the garage, the main floor the residence of the Milàs (a flat of all 1,323 m2), and the rest distributed over 20 apartments. The resulting layout is shaped like an asymmetrical "8" because of the different shapes and sizes of the courtyards. The attic housed the laundry and drying areas, forming an insulating space for the building and simultaneously determining the levels of the roof. One of the most notable elements of the building is the roof, crowned with skylights, staircase exits, fans, and chimneys. All of these elements, constructed out of brick covered with lime, broken marble, or glass have a specific architectural function but are also real sculptures integrated into the building. The apartments feature plastered ceilings with dynamic reliefs, handcrafted wooden doors, windows, and furniture, as well as hydraulic tiles and various ornamental elements. The stairways were intended as service entries, with the main access to the apartments by elevator except for the noble floor, where Gaudí added a prominent interior staircase. Gaudí wanted the people who lived in the flats to all know each other. Therefore, there were only elevators on every other floor, so people on different floors would meet one another. Structure Casa Milà is characterized by its self-supporting stone facade, meaning that it is free of load-bearing walls. The facade connects to the internal structure of each floor by means of curved iron beams surrounding the perimeter of each floor. This construction system allows, on one hand, large openings in the facade which give light to the homes, and on the other, free structuring of the different levels, so that internal walls can be added and demolished without affecting the stability of the building. This allows the owners to change their minds at will and to modify, without problems, the interior layout of the homes. Constructive and decorative items Facade The facade is composed of large blocks of limestone from the Garraf Massif on the first floor and from the Villefranche quarry for the higher levels. The blocks were cut to follow the plot of the projection of the model, then raised to their location and adjusted to align in a continuous curve to the pieces around them. Viewed from the outside the building has three parts: the main body of the six-storey blocks with winding stone floors, two floors set a block back with a different curve, similar to waves, a smoother texture and whiter color, and with small holes that look like embrasures, and finally the body of the roof. Gaudí's original facade had some of its lower-level ironwork removed. In 1928, the tailor Mosella opened the first store in La Pedrera, and he eliminated the bars. This did not concern anyone, because in the middle of twentieth century, wrought ironwork had little importance. The ironwork was lost until a few years later, when Americans donated one of them to the MoMa, where it is on display. With restoration initiatives launched in 1987, the facade was rejoined to some pieces of stone that had fallen. In order to respect the fidelity of the original, material was obtained from the Villefranche quarry, even though by then it was no longer operating. Hall and courtyards The building uses a completely original solution to solve the issue of a lobby being too

was obtained from the Villefranche quarry, even though by then it was no longer operating. Hall and courtyards The building uses a completely original solution to solve the issue of a lobby being too closed and dark. Its open and airy courtyards provide a place of transit and are directly visible to those accessing the building. There are two patios on the side of the Passeig de Gracia and of the street Provence. Patios Patios, structurally, are key as supporting loads of interior facades. The floor of the courtyard is supported by pillars of cast iron. In the courtyard, there are traditional elliptical beams and girders but Gaudí applied an ingenious solution of using two concentric cylindrical beams with stretched radial beams, like the spokes of a bicycle. They form a point outside of the beam to two points above and below, making the function of the central girder a keystone and working in tension and compression simultaneously. This supported structure is twelve feet in diameter and is considered "the soul of the building" with a clear resemblance to Gothic crypts. The centerpiece was built in a shipyard by Josep Maria Carandell who copied a steering wheel, interpreting Gaudí's intent as to represent the helm of the ship of life. Interior, gates Access is protected by a massive iron gate with a design attributed to Jujol. It was originally used by both people and cars, as access to the garage is in the basement, now an auditorium. The two halls are fully polychrome with oil paintings on the plaster surfaces, with eclectic references to mythology and flowers. During construction there was a problem including a basement as a garage for cars, the new invention that was thrilling the bourgeois at the time. The future neighbor Felix Anthony Meadows, owner of Industrial Linera, requested a change because his Rolls Royce could not access it. Gaudí agreed to remove a pillar on the ramp that led into the garage so that Felix, who was establishing sales and factory in Walls of Valles, could go to both places with his car from La Pedrera. For the floors of Casa Milà, Gaudí used a model of floor forms of square timbers with two colors, and the hydraulic pavement hexagonal pieces of blue and sea motifs that had originally been designed for the Batllo house. The wax was designed in gray by John Bertrand under the supervision of Gaudí who "touched up with their own fingers," in the words of the manufacturer Josep Bay. Loft Like in Casa Batlló, Gaudí shows the application of the catenary arch as a support structure for the roof, a form which he had already used shortly after graduating in the wood frameworks of Mataró's cooperative known as "L'Obrera Mataronense." In this case, Gaudí used the Catalan technique of timbrel, imported from Italy in the fourteenth century. The attic, where the laundry rooms were located, was a clear room under a Catalan vault roof supported by 270 parabolic vaults of different heights and spaced by about 80 cm. The roof resembles both the ribs of a huge animal and a palm, giving the roof-deck a very unconventional shape similar to a landscape of hills and valleys. The shape and location of the courtyards makes the arches higher when the space is narrowed and lower when the space expands. The builder Bayó explained its construction: "First the face of a wide wall was filled with mortar and plastered. Then Canaleta indicated the opening of each arch and Bayó put a nail at each starting point of the arch at the top of the wall. From these nails was dangled a chain so that the lowest point coincided with the deflection of the arch. Then the profile displayed on the wall by the chain was drawn and on this profile the carpenter marked and placed the corresponding centering, and the timbrel vault was started with three rows of plane bricks. Gaudí wanted to add a longitudinal axis of bricks connecting all vaults at their keystones". Roof and chimneys The work of Gaudí on the rooftop of La Pedrera brought his experience at Palau Güell together with solutions that were clearly more innovative – this time creating shapes and volumes with more body, more prominence, and less polychromasia. On the rooftop there are six skylights/staircase exits (four of which were covered with broken pottery and some that ended in a double cross typical of Gaudí), twenty-eight chimneys in several groupings, two half-hidden vents whose function is to renew the air in the building, and four domes that discharged to the facade. The staircases also house the water tanks; some of which are snail-shaped. The stepped roof of La Pedrera, called "the garden of warriors" by the poet Pere Gimferrer because the chimneys appear to be protecting the skylights, has undergone a radical restoration, removing chimneys added in interventions after Gaudí, television antennas, and other elements that degraded the space. The restoration brought back the splendor to the chimneys and the skylights that were covered with fragments of marble and broken Valencia tiles. One of the chimneys was topped with glass pieces – it was said that Gaudí did that the day after the inauguration of the building, taking advantage of the empty bottles from the party. It was restored with the bases of champagne bottles from the early twentieth century. The repair work has enabled the restoration of the original impact of the overhangs made of stone from Ulldecona with fragments of tiles. This whole set is more colorful than the facade, although here the creamy tones are dominant. Furniture Gaudí, as he had done in Casa Batlló, designed furniture specifically for the main floor. This was part of the concept artwork itself integral to modernism in which the architect assumed responsibility for global issues such as the structure and the facade, as well as every detail of the decor, designing furniture and accessories such as lamps, planters, floors or ceilings. This was another point of friction with Segimon, who complained that there was no straight wall to place her Steinway piano. Gaudí's response was blunt: "So play the violin." The result of these disagreements has been the loss of the decorative legacy of Gaudí, as most of the furniture was removed due to climate change and the changes she made to the main floor when Gaudí died. Some remain in private collections, including a curtain made of oak 4 m. long by 1.96 m. high in the Museum of Catalan Modernism; and a chair and desktop of Milà. Gaudí carved oak doors similar to what he had done for the Casa y Bardes, but these were only included on two floors as when Segimon discovered the price, she decided there would be no more at that quality. Architecture Casa Milà is part of the UNESCO World Heritage Site "Works of Antoni Gaudí". It was a predecessor of some buildings with a similar biomorphic appearance: the 1921 Einstein Tower in Potsdam, designed by Erich Mendelsohn Solomon R. Guggenheim Museum in Manhattan, New York, designed by Frank Lloyd Wright Chapelle Notre Dame du Haut, Ronchamp, France, designed by Le Corbusier the Hundertwasserhaus and other works by Austrian architect Friedensreich Hundertwasser Disney Concert Hall in Los Angeles, by Frank Gehry Free exhibitions often are held on the first floor, which also provides some opportunity to see the interior design. There is a charge for entrance to the apartment on the fourth floor and the roof. The other floors are not open to visitors. Constructive similarities Gaudí's La Pedrera was inspired by a mountain, but there is no agreement as to which mountain was the reference model. Joan Bergós thought it was the rocks of Fray Guerau in Prades mountains. Joan Matamala thought that the model could have been St. Miquel del Fai, while the sculptor Vicente Vilarubias believed it was inspired by the cliffs Torrent Pareis in Menorca. Other options include the mountains of Uçhisar in Cappadocia, suggested by Juan

cosmic rays with Earth's atmosphere), or by the simultaneous creation of both a particle and its antiparticle, which can occur in particle accelerators such as the Large Hadron Collider at CERN. Although particles and their antiparticles have opposite charges, electrically neutral particles need not be identical to their antiparticles. The neutron, for example, is made out of quarks, the antineutron from antiquarks, and they are distinguishable from one another because neutrons and antineutrons annihilate each other upon contact. However, other neutral particles are their own antiparticles, such as photons, Z0 bosons, mesons, and hypothetical gravitons and some hypothetical WIMPs. History Experiment In 1932, soon after the prediction of positrons by Paul Dirac, Carl D. Anderson found that cosmic-ray collisions produced these particles in a cloud chamber— a particle detector in which moving electrons (or positrons) leave behind trails as they move through the gas. The electric charge-to-mass ratio of a particle can be measured by observing the radius of curling of its cloud-chamber track in a magnetic field. Positrons, because of the direction that their paths curled, were at first mistaken for electrons travelling in the opposite direction. Positron paths in a cloud-chamber trace the same helical path as an electron but rotate in the opposite direction with respect to the magnetic field direction due to their having the same magnitude of charge-to-mass ratio but with opposite charge and, therefore, opposite signed charge-to-mass ratios. The antiproton and antineutron were found by Emilio Segrè and Owen Chamberlain in 1955 at the University of California, Berkeley. Since then, the antiparticles of many other subatomic particles have been created in particle accelerator experiments. In recent years, complete atoms of antimatter have been assembled out of antiprotons and positrons, collected in electromagnetic traps. Dirac hole theory Solutions of the Dirac equation contain negative energy quantum states. As a result, an electron could always radiate energy and fall into a negative energy state. Even worse, it could keep radiating infinite amounts of energy because there were infinitely many negative energy states available. To prevent this unphysical situation from happening, Dirac proposed that a "sea" of negative-energy electrons fills the universe, already occupying all of the lower-energy states so that, due to the Pauli exclusion principle, no other electron could fall into them. Sometimes, however, one of these negative-energy particles could be lifted out of this Dirac sea to become a positive-energy particle. But, when lifted out, it would leave behind a hole in the sea that would act exactly like a positive-energy electron with a reversed charge. These holes were interpreted as "negative-energy electrons" by Paul Dirac and mistakenly identified with protons in his 1930 paper A Theory of Electrons and Protons However, these "negative-energy electrons" turned out to be positrons, and not protons. This picture implied an infinite negative charge for the universe—a problem of which Dirac was aware. Dirac tried to argue that we would perceive this as the normal state of zero charge. Another difficulty was the difference in masses of the electron and the proton. Dirac tried to argue that this was due to the electromagnetic interactions with the sea, until Hermann Weyl proved that hole theory was completely symmetric between negative and positive charges. Dirac also predicted a reaction + → + , where an electron and a proton annihilate to give two photons. Robert Oppenheimer and Igor Tamm, however, proved that this would cause ordinary matter to disappear too fast. A year later, in 1931, Dirac modified his theory and postulated the positron, a new particle of the same mass as the electron. The discovery of this particle the next year removed the last two objections to his theory. Within Dirac's theory, the problem of infinite charge of the universe remains. Some bosons also have antiparticles, but since bosons do not obey the Pauli exclusion principle (only fermions do), hole theory does not work for them. A unified interpretation of antiparticles is now available in quantum field theory, which solves both these problems by describing antimatter as negative energy states of the same underlying matter field i.e. particles moving backwards in time. Particle–antiparticle annihilation If a particle and antiparticle are in the appropriate quantum states, then they can annihilate each other and produce other particles. Reactions such as + → (the two-photon annihilation of an electron-positron pair) are an example. The single-photon annihilation of an electron-positron pair, + → , cannot occur in free space because it is impossible to conserve energy and momentum together in this process. However, in the Coulomb field of a nucleus the translational invariance is broken and single-photon annihilation may occur. The reverse reaction (in free space, without an atomic nucleus) is also impossible for this reason. In quantum field theory, this process is allowed only

behind trails as they move through the gas. The electric charge-to-mass ratio of a particle can be measured by observing the radius of curling of its cloud-chamber track in a magnetic field. Positrons, because of the direction that their paths curled, were at first mistaken for electrons travelling in the opposite direction. Positron paths in a cloud-chamber trace the same helical path as an electron but rotate in the opposite direction with respect to the magnetic field direction due to their having the same magnitude of charge-to-mass ratio but with opposite charge and, therefore, opposite signed charge-to-mass ratios. The antiproton and antineutron were found by Emilio Segrè and Owen Chamberlain in 1955 at the University of California, Berkeley. Since then, the antiparticles of many other subatomic particles have been created in particle accelerator experiments. In recent years, complete atoms of antimatter have been assembled out of antiprotons and positrons, collected in electromagnetic traps. Dirac hole theory Solutions of the Dirac equation contain negative energy quantum states. As a result, an electron could always radiate energy and fall into a negative energy state. Even worse, it could keep radiating infinite amounts of energy because there were infinitely many negative energy states available. To prevent this unphysical situation from happening, Dirac proposed that a "sea" of negative-energy electrons fills the universe, already occupying all of the lower-energy states so that, due to the Pauli exclusion principle, no other electron could fall into them. Sometimes, however, one of these negative-energy particles could be lifted out of this Dirac sea to become a positive-energy particle. But, when lifted out, it would leave behind a hole in the sea that would act exactly like a positive-energy electron with a reversed charge. These holes were interpreted as "negative-energy electrons" by Paul Dirac and mistakenly identified with protons in his 1930 paper A Theory of Electrons and Protons However, these "negative-energy electrons" turned out to be positrons, and not protons. This picture implied an infinite negative charge for the universe—a problem of which Dirac was aware. Dirac tried to argue that we would perceive this as the normal state of zero charge. Another difficulty was the difference in masses of the electron and the proton. Dirac tried to argue that this was due to the electromagnetic interactions with the sea, until Hermann Weyl proved that hole theory was completely symmetric between negative and positive charges. Dirac also predicted a reaction + → + , where an electron and a proton annihilate to give two photons. Robert Oppenheimer and Igor Tamm, however, proved that this would cause ordinary matter to disappear too fast. A year later, in 1931, Dirac modified his theory and postulated the positron, a new particle of the same mass as the electron. The discovery of this particle the next year removed the last two objections to his theory. Within Dirac's theory, the problem of infinite charge of the universe remains. Some bosons also have antiparticles, but since bosons do not obey the Pauli exclusion principle (only fermions do), hole theory does not work for them. A unified interpretation of antiparticles is now available in quantum field theory, which solves both these problems by describing antimatter as negative energy states of the same underlying matter field i.e. particles moving backwards in time. Particle–antiparticle annihilation If a particle and antiparticle are in the appropriate quantum states, then they can annihilate each other and produce other particles. Reactions such as + → (the two-photon annihilation of an electron-positron pair) are an example. The single-photon annihilation of

and even after his N.W.A. days. Nassif also funded DJ Prince's first record, "Strange Life". He changed his stage name when he was 15 years old at the Skateland USA, the same skating venue credited for launching the NWA a few years later, due to a fan's suggestion. He said about his name: Arabian Prince started working with Bobby Jimmy & the Critters in 1984. He also produced the hit single and album for J.J. Fad, "Supersonic". In 1986, he was a founding member of N.W.A, but soon after fellow member Ice Cube came back from the Phoenix Institute of Technology in 1988, Arabian Prince left over royalty and contract disagreements. "I started off as a solo artist", he said, "so I was aware of what a royalty statement was. I knew that when these many records were sold, there is a quarterly statement. When you look at it, you can see how much money was paid and then share it. This was not the case. We were also never paid for touring." Eazy-E, Ice Cube and MC Ren remained as the main performers, DJ Yella was the turntablist and Dr. Dre was the main producer. After leaving N.W.A, Arabian Prince began a solo career. His first album, Brother Arab, was released in 1989 with the single "She's Got A Big Posse"; Where's My Bytches followed in 1993. In the mid-2000s, he started releasing music again, with his Professor X project on the Dutch label Clone Records. "I could not release the record under Arabian Prince", he said, "because I already had a single out, so I called myself Professor X on that record." In 2007,

Eazy-E, Ice Cube and MC Ren remained as the main performers, DJ Yella was the turntablist and Dr. Dre was the main producer. After leaving N.W.A, Arabian Prince began a solo career. His first album, Brother Arab, was released in 1989 with the single "She's Got A Big Posse"; Where's My Bytches followed in 1993. In the mid-2000s, he started releasing music again, with his Professor X project on the Dutch label Clone Records. "I could not release the record under Arabian Prince", he said, "because I already had a single out, so I called myself Professor X on that record." In 2007, he performed as a DJ on the 2K Sports Holiday Bounce Tour with artists from the Stones Throw label. In 2008, Stones Throw released a compilation of his electro-rap material from the 1980s. One of his songs was included on the 2007 video game, College Hoops 2K8. In 2015, a biopic about N.W.A. titled Straight Outta Compton was released; however, Arabian Prince was not portrayed in the film, and his role was omitted completely. The following year, N.W.A. was inducted into the Rock and Roll Hall of Fame, but again, Arabian Prince was not included nor mentioned. In 2018, Arabian Prince appeared on the AmeriKKKant album of industrial-metal band Ministry. He made a second appearance on Ministry's 2021 album Moral Hygiene. Other ventures Aside from his music career, he worked in special effects, 3D animation and video games. Straight Outta Compton movie controversy After the release of the NWA film, Straight Outta Compton, in 2015, Arabian Prince said to VladTV: "A lot of the scenes in real life, I was there -I'm just not there in the film, which I'm like, if you're gonna write me out of a movie, shoot some other scenes. Don't write scenes where I was there." Some of the pivotal scenes would be choosing the name for the band, the tour and the infamous Detroit concert. He also remembers himself as the main opposer to Jerry Heller about the royalties and the money, a role that in the movie was instead given to Ice Cube. Discography Solo Strange Life (1984) Rapsur Records Brother Arab (1989) Orpheus Records Where's My Bytches (1993) Da Bozak

the Pacific Ocean in an attempt to prove that pre-historic peoples could have traveled from South America. 1947 – The Bombay Municipal Corporation formally takes over the Bombay Electric Supply and Transport (BEST). 1959 – Explorer program: Explorer 6 launches from the Atlantic Missile Range in Cape Canaveral, Florida. 1960 – Ivory Coast becomes independent from France. 1962 – Canadian-born American pharmacologist Frances Oldham Kelsey awarded the U.S. President's Award for Distinguished Federal Civilian Service for her refusal to authorize thalidomide. 1964 – Vietnam War: The U.S. Congress passes the Gulf of Tonkin Resolution giving U.S. President Lyndon B. Johnson broad war powers to deal with North Vietnamese attacks on American forces. 1969 – Richard Nixon appoints Luis R. Bruce, a Mohawk-Oglala Sioux and co-founder of the National Congress of American Indians, as the new commissioner of the Bureau of Indian Affairs. 1970 – California judge Harold Haley is taken hostage in his courtroom and killed during an effort to free George Jackson from police custody. 1974 – Philippe Petit performs a high wire act between the twin towers of the World Trade Center in the air. 1976 – Viking program: Viking 2 enters orbit around Mars. 1978 – U.S. President Jimmy Carter declares a federal emergency at Love Canal due to toxic waste that had been disposed of negligently. 1981 – The Washington Star ceases all operations after 128 years of publication. 1985 – Takao Doi, Mamoru Mohri and Chiaki Mukai are chosen to be Japan's first astronauts. 1987 – Cold War: Lynne Cox becomes the first person to swim from the United States to the Soviet Union, crossing the Bering Strait from Little Diomede Island in Alaska to Big Diomede in the Soviet Union. 1989 – U.S. Congressman Mickey Leland (D-TX) and 15 others die in a plane crash in Ethiopia. 1990 – First American soldiers arrive in Saudi Arabia as part of the Gulf War. 1993 – Ada Deer, a Menominee activist, sworn in as the head of the Bureau of Indian Affairs. 1995 – The Chilean government declares state of emergency in the southern half of the country in response to an event of intense, cold, wind, rain and snowfall known as the White Earthquake. 1997 – Space Shuttle Program: The Space Shuttle Discovery launches on STS-85 from the Kennedy Space Center in Cape Canaveral, Florida. 1997 – Fine Air Flight 101 crashes after takeoff from Miami International Airport, killing five people. 1998 – Bombings at United States embassies in Dar es Salaam, Tanzania and Nairobi, Kenya kill approximately 212 people. 1999 – The Chechnya-based Islamic International Brigade invades neighboring Dagestan. 2007 – At AT&T Park, Barry Bonds hits his 756th career home run to surpass Hank Aaron's 33-year-old record. 2008 – The start of the Russo-Georgian War over the territory of South Ossetia. 2020 – Air India Express Flight 1344 overshoots the runway at Calicut International Airport in the Malappuram district of Kerala, India, and crashes, killing 21 of the 190 people on board. Births Pre-1600 317 – Constantius II, Roman emperor (d. 361) 1282 – Elizabeth of Rhuddlan (d. 1316) 1533 – Alonso de Ercilla, Spanish soldier and poet (d. 1595) 1560 – Elizabeth Báthory, Hungarian aristocrat and serial killer (d. 1614) 1571 – Thomas Lupo, English viol player and composer (d. 1627) 1574 – Robert Dudley, English explorer and cartographer (d. 1649) 1598 – Georg Stiernhielm, Swedish poet and linguist (d. 1672) 1601–1900 1613 – William Frederick, Prince of Nassau-Dietz, Dutch stadtholder (d. 1664) 1702 – Muhammad Shah, Mughal emperor of India (d. 1748) 1726 – James Bowdoin, American banker and politician, 2nd Governor of Massachusetts (d. 1790) 1742 – Nathanael Greene, American general (d. 1786) 1751 – Wilhelmina of Prussia, Princess of Orange (d. 1820) 1779 – Carl Ritter, German geographer and academic (d. 1859) 1826 – August Ahlqvist, Finnish professor, poet, scholar of the Finno-Ugric languages, author, and literary critic (d. 1889) 1844 – Auguste Michel-Lévy, French geologist and author (d. 1911) 1860 – Alan Leo, English astrologer and author (d. 1917) 1862 – Henri Le Sidaner, French painter (d. 1939) 1862 – Victoria of Baden (d. 1931) 1867 – Emil Nolde, Danish-German painter and illustrator (d. 1956) 1868 – Ladislaus Bortkiewicz, Russian-German economist and statistician (d. 1931) 1868 – Huntley Wright, English actor (d. 1941) 1869 – Mary Frances Winston, American mathematician (d. 1959) 1876 – Mata Hari, Dutch dancer and spy (d. 1917) 1879 – Johannes Kotze, South African cricketer (d. 1931) 1884 – Billie Burke, American actress and singer (d. 1970) 1884 – Nikolai Triik, Estonian painter and illustrator (d. 1940) 1887 – Anna Elisabet Weirauch, German author and playwright (d. 1970) 1890 – Elizabeth Gurley Flynn, American author and activist (d. 1964) 1901–present 1901 – Ann Harding, American actress and singer (d. 1981) 1903 – Louis Leakey, Kenyan-English palaeontologist and archaeologist (d. 1972) 1904 – Ralph Bunche, American political scientist, academic, and diplomat, Nobel Prize laureate (d. 1971) 1907 – Albert Kotin, Belarusian-American soldier and painter (d. 1980) 1910 – Freddie Slack, American pianist and bandleader (d. 1965) 1911 – István Bibó, Hungarian lawyer and politician (d. 1979) 1911 – Nicholas Ray, American director and screenwriter (d. 1979) 1913 – George Van Eps, American guitarist (d. 1998) 1916 – Kermit Love, American actor, puppeteer, and costume designer (d. 2008) 1918 – C. Buddingh', Dutch poet and translator (d. 1985) 1918 – Gordon Zahn, American sociologist and author (d. 2007) 1921 – Manitas de Plata, French guitarist (d. 2014) 1921 – Karel Husa, Czech-American composer and conductor (d. 2016) 1924 – Kenneth Kendall, Indian-English journalist and actor (d. 2012) 1925 – Felice Bryant, American songwriter (d. 2003) 1926 – Stan Freberg, American puppeteer, voice actor, and singer (d. 2015) 1927 – Rocky Bridges, American baseball player and coach (d. 2015) 1927 – Edwin Edwards, American soldier, lawyer, and politician, 50th Governor of Louisiana (d. 2021) 1927 – Art Houtteman, American baseball player and journalist (d. 2003) 1928 – Betsy Byars, American author and academic (d. 2020) 1928 – Owen Luder, English architect, designed Tricorn Centre and Trinity Square 1928 – James Randi, Canadian-American stage magician and author (d. 2020) 1929 – Don Larsen, American baseball player (d. 2020) 1930 – Togrul Narimanbekov, Azerbaijani-French painter and academic (d. 2013) 1930 – Veljo Tormis, Estonian composer and educator (d. 2017) 1931 – Jack Good, British television producer (d. 2017) 1931 – Charles E. Rice, American scholar and author (d. 2015) 1932 – Abebe Bikila, Ethiopian runner (d. 1973) 1932 – Edward Hardwicke, English actor (d. 2011) 1932 – Rien Poortvliet, Dutch painter and illustrator (d. 1995) 1932 – Maurice Rabb, Jr., American ophthalmologist and academic (d. 2005) 1933 – Eddie Firmani, South African footballer and manager 1933 – Elinor Ostrom, American economist and academic, Nobel Prize laureate (d. 2012) 1933 – Jerry Pournelle, American journalist and author (d. 2017) 1933 – Alberto Romulo, Filipino politician and diplomat 1934 – Sándor Simó, Hungarian director, producer, and screenwriter (d. 2001) 1935 – Rahsaan Roland Kirk, American saxophonist and composer (d. 1977) 1937 – Zoltán Berczik, Hungarian table tennis player and coach (d. 2011) 1937 – Don Wilson, English cricketer and coach (d. 2012) 1940 – Jean-Luc Dehaene, French-Belgian lawyer and politician, 63rd Prime Minister of Belgium (d. 2014) 1940 – Uwe Nettelbeck, German record producer, journalist and film critic (d. 2007) 1941

Firmani, South African footballer and manager 1933 – Elinor Ostrom, American economist and academic, Nobel Prize laureate (d. 2012) 1933 – Jerry Pournelle, American journalist and author (d. 2017) 1933 – Alberto Romulo, Filipino politician and diplomat 1934 – Sándor Simó, Hungarian director, producer, and screenwriter (d. 2001) 1935 – Rahsaan Roland Kirk, American saxophonist and composer (d. 1977) 1937 – Zoltán Berczik, Hungarian table tennis player and coach (d. 2011) 1937 – Don Wilson, English cricketer and coach (d. 2012) 1940 – Jean-Luc Dehaene, French-Belgian lawyer and politician, 63rd Prime Minister of Belgium (d. 2014) 1940 – Uwe Nettelbeck, German record producer, journalist and film critic (d. 2007) 1941 – Matthew Evans, Baron Evans of Temple Guiting, English publisher and politician (d. 2016) 1942 – Garrison Keillor, American humorist, novelist, short story writer, and radio host 1942 – Carlos Monzon, Argentinian boxer and actor (d. 1995) 1942 – Caetano Veloso, Brazilian singer-songwriter, writer and producer 1942 – Richard Sykes, English biochemist and academic 1942 – B. J. Thomas, American singer (d. 2021) 1943 – Mohammed Badie, Egyptian religious leader 1943 – Lana Cantrell, Australian singer-songwriter and lawyer 1943 – Alain Corneau, French director and screenwriter (d. 2010) 1944 – John Glover, American actor 1944 – Robert Mueller, American soldier and lawyer, 6th Director of the Federal Bureau of Investigation 1945 – Kenny Ireland, Scottish actor and director (d. 2014) 1945 – Alan Page, American football player and jurist 1947 – Franciscus Henri, Dutch-Australian singer-songwriter 1947 – Sofia Rotaru, Ukrainian singer-songwriter, producer, and actress 1948 – Marty Appel, American businessman and author 1948 – Greg Chappell, Australian cricketer and coach 1949 – Walid Jumblatt, Lebanese journalist and politician 1949 – Matthew Parris, South African-English journalist and politician 1950 – Rodney Crowell, American singer-songwriter and guitarist 1950 – Alan Keyes, American politician and diplomat, 16th Assistant Secretary of State for International Organization Affairs 1950 – S. Thandayuthapani, Sri Lankan educator and politician 1952 – Caroline Aaron, American actress and producer 1952 – Eamonn Darcy, Irish golfer 1952 – Kees Kist, Dutch footballer 1952 – Alexei Sayle, English comedian, actor, and author 1953 – Anne Fadiman, American journalist and author 1954 – Valery Gazzaev, Russian footballer, manager and politician 1954 – Jonathan Pollard, Israeli spy 1954 – Alan Reid, Scottish politician 1955 – Wayne Knight, American actor, comedian and voice actor 1955 – Greg Nickels, American lawyer and politician, 51st Mayor of Seattle 1955 – Vladimir Sorokin, Russian author and playwright 1957 – Daire Brehan, Irish journalist, lawyer, and actress (d. 2012) 1957 – Alexander Dityatin, Russian gymnast and colonel 1958 – Russell Baze, Canadian-American jockey 1958 – Bruce Dickinson, English singer-songwriter and guitarist 1958 – Alberto Salazar, Cuban-American runner and coach 1959 – Koenraad Elst, Belgian orientalist and author 1959 – Ali Shah, Zimbabwean cricketer and coach 1960 – David Duchovny, American actor, director, producer, and screenwriter 1961 – Brian Conley, English actor and singer 1961 – Yelena Davydova, Russian gymnast 1961 – Walter Swinburn, English jockey and trainer (d. 2016) 1962 – Alison Brown, American banjo player, songwriter, and producer 1963 – Paul Dunn, Australian rugby league player 1963 – Nick Gillespie, American journalist and author 1963 – Marcus Roberts, American pianist and educator 1964 – John Birmingham, English-Australian journalist and author 1964 – Ian Dench, English guitarist and songwriter 1964 – Peter Niven, Scottish jockey 1965 – Raul Malo, American singer-songwriter, guitarist, and producer 1965 – Elizabeth Manley, Canadian figure skater 1966 – David Cairns, Scottish laicised priest and politician, Minister of State for Scotland (d. 2011) 1966 – Shobna Gulati, British actress 1966 – Kristin Hersh, American singer-songwriter and guitarist 1966 – Jimmy Wales, American-British entrepreneur, co-founder of Wikipedia 1967 – Jason Grimsley, American baseball player 1968 – Francesca Gregorini, Italian-American director and screenwriter 1968 – Trevor Hendy, Australian surfer and coach 1968 – Sophie Lee, Australian actress and author 1969 – Paul Lambert, Scottish footballer and manager 1969 – Dana G. Peleg, Israeli writer and LGBT activist 1970 – Eric Namesnik, American swimmer (d. 2006) 1971 – Dominic Cork, England cricketer and sportscaster 1971 – Rachel York, American actress and singer 1972 – Gerry Peñalosa, Filipino boxer and promoter 1973 – Mikhail Gorsheniov, Russian singer-songwriter (d. 2013) 1973 – Danny Graves, Vietnamese-American baseball player 1973 – Kevin Muscat, English-Australian footballer, coach, and manager 1974 – Chico Benymon, American actor 1974 – Michael Shannon, American actor 1975 – Koray Candemir, Turkish singer-songwriter 1975 – Gerard Denton, Australian cricketer 1975 – Megan Gale, Australian model and actress 1975 – Ray Hill, American football player (d. 2015) 1975 – Rebecca Kleefisch, American journalist and politician, 44th Lieutenant Governor of Wisconsin 1975 – Édgar Rentería, Colombian baseball player 1975 – Charlize Theron, South African actress 1976 – Dimitrios Eleftheropoulos, Greek footballer and manager 1976 – Shane Lechler, American football player 1977 – Charlotte Ronson, English fashion designer 1977 – Samantha Ronson, English singer-songwriter and DJ 1977 – Justin Brooker, Rugby League Player 1978 – Alexandre Aja, French director, producer, and screenwriter 1978 – Jamey Jasta, American singer-songwriter 1978 – Mark McCammon, English-Barbadian footballer 1978 – Cirroc Lofton, American actor 1979 – Eric Johnson, American actor, director, and screenwriter 1979 – Miguel Llera, Spanish footballer 1979 – Birgit Zotz, Austrian anthropologist and author 1980 – Carsten Busch, German footballer 1980 – Aurélie Claudel, French model and actress 1980 – Tácio Caetano Cruz Queiroz, Brazilian footballer 1980 – Seiichiro Maki, Japanese footballer 1981 – David Testo, American soccer player 1981 – Randy Wayne, American actor and producer 1982 – Ángeles Balbiani, Argentine actress and singer 1982 – Abbie Cornish, Australian actress 1982 – Juan Martín Hernández, Argentine rugby player 1982 – Marquise Hill, American football player (d. 2007) 1982 – Vassilis Spanoulis, Greek basketball player 1982 – Martin Vučić, Macedonian singer and drummer 1983 – Christian Chávez, Mexican singer-songwriter and actor 1983 – Murat Dalkılıç, Turkish singer-songwriter 1983 – Danny, Portuguese footballer 1983 – Andriy Hrivko, Ukrainian cyclist 1983 – Mark Pettini, English cricketer and journalist 1984 – Stratos Perperoglou, Greek basketball player 1984 – Tooba Siddiqui, Pakistani model and actress 1984 – Yun Hyon-seok, South Korean poet and author (d. 2003) 1986 – Paul Biedermann, German swimmer 1986 – Valter Birsa, Slovenian footballer 1986 – Altaír Jarabo, Mexican model and actress 1986 – Juan de la Rosa, Mexican boxer 1987 – Sidney Crosby, Canadian ice hockey player 1987 – Mustapha Dumbuya, Sierra Leonean footballer 1987 – Ryan Lavarnway, American baseball player 1987 – Rouven Sattelmaier, German footballer 1988 – Jonathan Bernier, Canadian ice hockey player 1988 – Mohamed Coulibaly, Senegalese footballer 1988 – Anisa Mohammed, West Indian cricketer 1988 – Melody Oliveria, American blogger 1988 – Erik Pieters, Dutch footballer 1988 – Beanie Wells, American football player 1989 – DeMar DeRozan, American basketball player 1990 – Josh Franceschi, English singer-songwriter 1991 – Luis Salom, Spanish motorcycle racer (d. 2016) 1991 – Mitchell te Vrede, Dutch footballer 1991 – Mike Trout, American baseball player 1992 – Adam Yates, English cyclist 1992 – Simon Yates, English cyclist 1992 – E. J. Tackett, American bowler 1993 – Martti Nõmme, Estonian ski jumper 1993 – Karol Zalewski, Polish sprinter 1998 – Vladimir Barbu, Italian diver 1998 – María Bazo, Peruvian windsurfer Deaths Pre-1600 461 – Majorian, Roman emperor (b. 420) 707 – Li Chongjun, Chinese prince 1028 – Alfonso V, king of León (b. 994) 1106 – Henry IV, Holy Roman Emperor (b. 1050) 1234 – Hugh Foliot, bishop of Hereford (b. c. 1155) 1272 – Richard Middleton, English Lord Chancellor 1296 – Heinrich II von Rotteneck, prince-bishop of Regensburg 1385 – Joan of Kent, mother of Richard II (b. 1328) 1485 – Alexander Stewart, duke of Albany (b. 1454) 1547 – Cajetan, Italian priest and saint (b. 1480) 1601–1900 1613 – Thomas Fleming, English judge and politician, Lord Chief Justice of England (b. 1544) 1616 – Vincenzo Scamozzi, Italian architect, designed Teatro Olimpico (b. 1548) 1632 – Robert de Vere, 19th Earl of Oxford, English soldier (b. 1575) 1635 – Friedrich Spee, German poet and academic (b. 1591) 1639 – Martin van den Hove, Dutch astronomer and mathematician (b. 1605) 1661 – Jin Shengtan, Chinese journalist and critic (b. 1608) 1787 – Francis Blackburne, English Anglican churchman and activist (b. 1705) 1817 – Pierre Samuel du Pont de Nemours, French economist and politician (b. 1739) 1834 – Joseph Marie Jacquard, French weaver and inventor, invented the Jacquard loom (b. 1752) 1848 – Jöns Jacob Berzelius, Swedish chemist and academic (b. 1779) 1855 – Mariano Arista, Mexican general and politician, 19th President of Mexico (b. 1802) 1864 – Li Xiucheng, Chinese field marshal (b. 1823) 1893 – Alfredo Catalani, Italian composer and academic (b. 1854) 1899 – Jacob Maris, Dutch painter and educator (b. 1837) 1900 – Wilhelm Liebknecht, German lawyer and politician (b. 1826) 1901–present 1912 – François-Alphonse Forel, Swiss limnologist and academic (b. 1841) 1917 – Edwin Harris Dunning, South African-English commander and pilot (b. 1891) 1938 – Konstantin Stanislavski, Russian actor and director (b. 1863) 1941 – Rabindranath Tagore, Indian author, poet, and playwright, Nobel Prize laureate (b. 1861) 1948 – Charles Bryant, English-American actor and director (b. 1879) 1953 – Abner Powell, American baseball player and manager (b. 1860) 1957 – Oliver Hardy, American actor, singer, and director (b. 1892) 1958 – Elizabeth Foreman Lewis, American author and educator (b. 1892) 1960 – Luis Ángel Firpo, Argentine boxer (b. 1894) 1963 – Ramon Vila Capdevila, last of the Spanish Maquis, holding out after the end of the Spanish Civil War (b.1908) 1968 – Giovanni Bracco, Italian race car driver (b. 1908) 1969 – Jean Bastien, French professional footballer (b. 1915) 1969 – Joseph Kosma, Hungarian-French composer (b. 1905) 1970 – Harold Haley, American lawyer and judge (b. 1904) 1970 – Jonathan P. Jackson, American bodyguard and kidnapper (b. 1953) 1972 – Joi Lansing, American model, actress, and singer (b. 1929) 1973 – Jack Gregory, Australian cricketer (b. 1895) 1974 – Rosario Castellanos, Mexican poet and author (b. 1925) 1974 – Sylvio Mantha, Canadian ice hockey player and coach (b. 1902) 1978 – Eddie Calvert, English trumpeter (b. 1922) 1981 – Gunnar Uusi, Estonian chess player (b. 1931) 1985 – Grayson Hall, American actress (b. 1922) 1987 – Camille Chamoun, Lebanese lawyer and politician, 7th President of Lebanon (b. 1900) 1989 – Mickey Leland, American lawyer and politician (b. 1944) 1994 – Larry Martyn, English actor (b. 1934) 1995 – Brigid Brophy, English author and critic (b. 1929) 2001 – Algirdas Lauritėnas, Lithuanian basketball player (b. 1932) 2003 – K. D. Arulpragasam, Sri Lankan zoologist and academic (b. 1931) 2003 – Mickey McDermott, American baseball player and coach (b. 1929) 2004 – Red Adair, American firefighter (b. 1915) 2004 – Colin Bibby, English ornithologist and academic (b. 1948) 2005 – Peter Jennings, Canadian-American journalist and author (b. 1938) 2006 – Mary Anderson Bain, American lawyer and politician (b. 1911) 2007 – Ernesto Alonso, Mexican actor, director, and producer (b. 1917) 2007 – Angus Tait, New Zealand businessman, founded Tait Communications (b. 1919) 2008 – Bernie Brillstein, American talent agent and producer (b. 1931) 2008 – Andrea Pininfarina, Italian engineer and businessman (b. 1957) 2009 – Louis E. Saavedra, American educator and politician, 48th Mayor of Albuquerque (b. 1933) 2009 – Mike Seeger, American singer-songwriter (b. 1933) 2010 – John Nelder, English mathematician and statistician (b. 1924) 2011 – Mark Hatfield, American soldier,

(Hundred Days Offensive). 1919 – The Anglo-Afghan Treaty of 1919 is signed. It establishes peaceful relations between Afghanistan and the UK, and confirms the Durand line as the mutual border. In return, the UK is no longer obligated to subsidize the Afghan government. 1929 – The German airship Graf Zeppelin begins a round-the-world flight. 1940 – The "Aufbau Ost" directive is signed by Wilhelm Keitel. 1942 – Quit India Movement is launched in India against the British rule in response to Mohandas Gandhi's call for swaraj or complete independence. 1945 – The London Charter is signed by France, the United Kingdom, the Soviet Union and the United States, establishing the laws and procedures for the Nuremberg trials. 1946 – First flight of the Convair B-36, the world's first mass-produced nuclear weapon delivery vehicle, the heaviest mass-produced piston-engined aircraft, with the longest wingspan of any military aircraft, and the first bomber with intercontinental range. 1963 – Great Train Robbery: In England, a gang of 15 train robbers steal £2.6 million in bank notes. 1963 – The Zimbabwe African National Union (ZANU), the current ruling party of Zimbabwe, is formed by a split from the Zimbabwe African People's Union. 1967 – The Association of Southeast Asian Nations (ASEAN) is founded by Indonesia, Malaysia, the Philippines, Singapore and Thailand. 1969 – At a zebra crossing in London, photographer Iain Macmillan takes the iconic photo that becomes the cover image of the Beatles' album Abbey Road. 1973 – Kim Dae-jung, a South Korean politician and later president of South Korea, is kidnapped. 1974 – President Richard Nixon, in a nationwide television address, announces his resignation from the office of the President of the United States effective noon the next day. 1988 – The 8888 Uprising begins in Rangoon (Yangon), Burma (Myanmar). Led by students, hundreds of thousands join in nationwide protests against the one-party regime. On September 18, the demonstrations end in a military crackdown, killing thousands. 1988 – The first night baseball game in the history of Chicago's Wrigley Field (game was rained out in the fourth inning). 1989 – Space Shuttle program: STS-28 Mission: Space Shuttle Columbia takes off on a secret five-day military mission. 1990 – Iraq occupies Kuwait and the state is annexed to Iraq. This would lead to the Gulf War shortly afterward. 1991 – The Warsaw radio mast, at one time the tallest construction ever built, collapses. 1993 – The 7.8 Guam earthquake shakes the island with a maximum Mercalli intensity of IX (Violent), causing around $250 million in damage and injuring up to 71 people. 1998 – Iranian consulate in Mazar-i-Sharif, Afghanistan is raided by Taliban leading to the deaths of ten Iranian diplomats and a journalist. 2000 – Confederate submarine H.L. Hunley is raised to the surface after 136 years on the ocean floor and 30 years after its discovery by undersea explorer E. Lee Spence. 2001 – Albanian rebels ambush a convoy of the Army of the Republic of Macedonia near Tetovo, killing 10 soldiers. 2004 – A tour bus belonging to the Dave Matthews Band dumps approximately 800 pounds of human waste onto a boat full of passengers. 2007 – An EF2 tornado touches down in Kings County and Richmond County, New York, the most powerful tornado in New York to date and the first in Brooklyn since 1889. 2008 – A EuroCity express train en route from Kraków, Poland to Prague, Czech Republic strikes a part of a motorway bridge that had fallen onto the railroad track near Studénka railway station in the Czech Republic and derails, killing eight people and injuring 64 others. 2008 – The 29th modern summer Olympic Games took place in Beijing, China until August 24. 2010 – China Floods: A mudslide in Zhugqu County, Gansu, China, kills more than 1,400 people. 2013 – A suicide bombing at a funeral in the Pakistani city of Quetta kills at least 31 people. 2015 – Eight people are killed in a shooting in Harris County, Texas. 2016 – Terrorists attack a government hospital in Quetta, Pakistan with a suicide blast and shooting, killing between 70 and 94 people, and injuring around 130 others. Births Pre-1600 422 – Casper, ruler of the Maya city of Palenque 1079 – Emperor Horikawa of Japan (d. 1107) 1170 – Saint Dominic, founder of the Dominicans (d. 1221) 1306 – Rudolf II, Duke of Bavaria (d. 1353) 1492 – Matteo Tafuri, Italian alchemist (d. 1582) 1518 – Conrad Lycosthenes, French-German scholar and author (d. 1561) 1558 – George Clifford, 3rd Earl of Cumberland, English noble (d. 1605) 1601–1900 1605 – Cecil Calvert, 2nd Baron Baltimore, English lawyer and politician, Governor of Newfoundland (d. 1675) 1640 – Amalia Catharina, German poet and composer (d. 1697) 1646 – Godfrey Kneller, German-English painter (d. 1723) 1673 – John Ker, Scottish spy (d. 1726) 1693 – Laurent Belissen, French composer (d. 1762) 1694 – Francis Hutcheson, Irish philosopher and academic (d. 1746) 1709 – Hermann Anton Gelinek, German-Italian monk and violinist (d. 1779) 1720 – Carl Fredrik Pechlin, Swedish general and politician (d. 1796) 1754 – Hipólito Ruiz López, Spanish botanist (d. 1816) 1758 – Friedrich Georg Weitsch, German painter (d. 1828) 1790 – Ferenc Kölcsey, Hungarian poet, critic, and politician (d. 1838) 1807 – Emilie Flygare-Carlén, Swedish author (d. 1892) 1814 – Esther Hobart Morris, American suffragette and judge (d. 1902) 1822 – George Stoneman, Jr., United States Army cavalry officer (d. 1894) 1839 – Nelson A. Miles, American general (d. 1925) 1851 – George Turner, Australian politician, 18th Premier of Victoria (d. 1916) 1856 – Thomas Anstey Guthrie, English journalist and author (d. 1934) 1857 – Cécile Chaminade, French pianist and composer (d. 1944) 1863 – Jean Leon Gerome Ferris, American painter (d. 1930) 1866 – Matthew Henson, American explorer (d. 1955) 1874 – Albert Stanley, 1st Baron Ashfield, English businessman and politician, President of the Board of Trade (d. 1948) 1875 – Arthur Bernardes, Brazilian lawyer and politician, 12th President of Brazil (d. 1955) 1876 – Varghese Payyappilly Palakkappilly, Indian-Syrian priest, founded the Sisters of the Destitute (d. 1929) 1879 – Bob Smith, American physician and surgeon, co-founded Alcoholics Anonymous (d. 1950) 1879 – Emiliano Zapata, Mexican general and politician (d. 1919) 1880 – Earle Page, Australian lawyer, academic, and politician, 11th Prime Minister of Australia (d. 1961) 1881 – Paul Ludwig Ewald von Kleist, German field marshal (d. 1954) 1882 – Ladislas Starevich, Russian-French animator, screenwriter, and cinematographer (d. 1965) 1884 – Sara Teasdale, American poet and educator (d. 1933) 1889 – Hans Egede Budtz, Danish actor (d. 1968) 1889 – Jack Ryder, Australian cricketer (d. 1977) 1891 – Adolf Busch, German violinist and composer (d. 1952) 1896 – Marjorie Kinnan Rawlings, American author and academic (d. 1953) 1898 – Marguerite Bise, French chef (d. 1965) 1901–present 1901 – Ernest Lawrence, American physicist and academic, Nobel Prize laureate (d. 1958) 1902 – Paul Dirac, English-American physicist and academic, Nobel Prize laureate (d. 1984) 1904 – Achille Varzi, Italian racing driver (d. 1948) 1905 – André Jolivet, French composer (d. 1974) 1907 – Benny Carter, American saxophonist, trumpet player, and composer (d. 2003) 1908 – Arthur Goldberg, American jurist and politician, 6th United States Ambassador to the United Nations (d. 1990) 1909 – Charles Lyttelton, 10th Viscount Cobham, English cricketer and politician, 9th Governor-General of New Zealand (d. 1977) 1909 – Jack Renshaw, Australian politician, 31st Premier of New South Wales (d. 1987) 1909 – Bill Voce, England cricketer and coach (d. 1984) 1910 – Jimmy Murphy, Welsh-English footballer and manager (d. 1989) 1910 – Sylvia Sidney, American actress (d. 1999) 1911 – Rosetta LeNoire, American actress (d. 2002) 1915 – James Elliott, American runner and coach (d. 1981) 1919 – Dino De Laurentiis, Italian actor and producer (d. 2010) 1919 – John David Wilson, English animator and producer (d. 2013) 1920 – Leo Chiosso, Italian songwriter and producer (d. 2006) 1920 – Jimmy Witherspoon, American jump blues singer (d. 1997) 1921 – William Asher, American director, producer, and screenwriter (d. 2012) 1921 – Webb Pierce, American singer-songwriter and guitarist (d. 1991) 1921 – Esther

hot air in an audience before the king of Portugal in Lisbon, Portugal. 1786 – Mont Blanc on the French-Italian border is climbed for the first time by Jacques Balmat and Dr. Michel-Gabriel Paccard. 1794 – Joseph Whidbey leads an expedition to search for the Northwest Passage near Juneau, Alaska. 1831 – Four hundred Shawnee people agree to relinquish their lands in Ohio in exchange for land west of the Mississippi River in the Treaty of Wapakoneta. 1844 – The Quorum of the Twelve Apostles, headed by Brigham Young, is reaffirmed as the leading body of The Church of Jesus Christ of Latter-day Saints (LDS Church). 1863 – American Civil War: Following his defeat in the Battle of Gettysburg, General Robert E. Lee sends a letter of resignation to Confederate President Jefferson Davis (which is refused upon receipt). 1870 – The Republic of Ploiești, a failed Radical-Liberal rising against Domnitor Carol of Romania. 1876 – Thomas Edison receives a patent for his mimeograph. 1901–present 1903 – Black Saturday occurs, killing 12 in a stadium collapse in Philadelphia. 1908 – Wilbur Wright makes his first flight at a racecourse at Le Mans, France. It is the Wright Brothers' first public flight. 1918 – World War I: The Battle of Amiens begins a string of almost continuous Allied victories with a push through the German front lines (Hundred Days Offensive). 1919 – The Anglo-Afghan Treaty of 1919 is signed. It establishes peaceful relations between Afghanistan and the UK, and confirms the Durand line as the mutual border. In return, the UK is no longer obligated to subsidize the Afghan government. 1929 – The German airship Graf Zeppelin begins a round-the-world flight. 1940 – The "Aufbau Ost" directive is signed by Wilhelm Keitel. 1942 – Quit India Movement is launched in India against the British rule in response to Mohandas Gandhi's call for swaraj or complete independence. 1945 – The London Charter is signed by France, the United Kingdom, the Soviet Union and the United States, establishing the laws and procedures for the Nuremberg trials. 1946 – First flight of the Convair B-36, the world's first mass-produced nuclear weapon delivery vehicle, the heaviest mass-produced piston-engined aircraft, with the longest wingspan of any military aircraft, and the first bomber with intercontinental range. 1963 – Great Train Robbery: In England, a gang of 15 train robbers steal £2.6 million in bank notes. 1963 – The Zimbabwe African National Union (ZANU), the current ruling party of Zimbabwe, is formed by a split from the Zimbabwe African People's Union. 1967 – The Association of Southeast Asian Nations (ASEAN) is founded by Indonesia, Malaysia, the Philippines, Singapore and Thailand. 1969 – At a zebra crossing in London, photographer Iain Macmillan takes the iconic photo that becomes the cover image of the Beatles' album Abbey Road. 1973 – Kim Dae-jung, a South Korean politician and later president of South Korea, is kidnapped. 1974 – President Richard Nixon, in a nationwide television address, announces his resignation from the office of the President of the United States effective noon the next day. 1988 – The 8888 Uprising begins in Rangoon (Yangon), Burma (Myanmar). Led by students, hundreds of thousands join in nationwide protests against the one-party regime. On September 18, the demonstrations end in a military crackdown, killing thousands. 1988 – The first night baseball game in the history of Chicago's Wrigley Field (game was rained out in the fourth inning). 1989 – Space Shuttle program: STS-28 Mission: Space Shuttle Columbia takes off on a secret five-day military mission. 1990 – Iraq occupies Kuwait and the state is annexed to Iraq. This would lead to the Gulf War shortly afterward. 1991 – The Warsaw radio mast, at one time the tallest construction ever built, collapses. 1993 – The 7.8 Guam earthquake shakes the island with a maximum Mercalli intensity of IX (Violent), causing around $250 million in damage and injuring up to 71 people. 1998 – Iranian consulate in Mazar-i-Sharif, Afghanistan is raided by Taliban leading to the deaths of ten Iranian diplomats and a journalist. 2000 – Confederate submarine H.L. Hunley is raised to the surface after 136 years on the ocean floor and 30 years after its discovery by undersea explorer E. Lee Spence. 2001 – Albanian rebels ambush a convoy of the Army of the Republic of Macedonia near Tetovo, killing 10 soldiers. 2004 – A tour bus belonging to the Dave Matthews Band dumps approximately 800 pounds of human waste onto a boat full of passengers. 2007 – An EF2 tornado touches down in Kings County and Richmond County, New York, the most powerful tornado in New York to date and the first in Brooklyn since 1889. 2008 – A EuroCity express train en route from Kraków, Poland to Prague, Czech Republic strikes a part of a motorway bridge that had fallen onto the railroad track near Studénka railway station in the Czech Republic and derails, killing eight people and injuring 64 others. 2008 – The 29th modern summer Olympic Games took place in Beijing, China until August 24. 2010 – China Floods: A mudslide in Zhugqu County, Gansu, China, kills more than 1,400 people. 2013 – A suicide bombing at a funeral in the Pakistani city of Quetta kills at least 31 people. 2015 – Eight people are killed in a shooting in Harris County, Texas. 2016 – Terrorists attack a government hospital in Quetta, Pakistan with a suicide blast and shooting, killing between 70 and 94 people, and injuring around 130 others. Births Pre-1600 422 – Casper, ruler of the Maya city of Palenque 1079 – Emperor Horikawa of Japan (d. 1107) 1170 – Saint Dominic, founder of the Dominicans (d. 1221) 1306 – Rudolf II, Duke of Bavaria (d. 1353) 1492 – Matteo Tafuri, Italian alchemist (d. 1582) 1518 – Conrad Lycosthenes, French-German scholar and author (d. 1561) 1558 – George Clifford, 3rd Earl of Cumberland, English noble (d. 1605) 1601–1900 1605 – Cecil Calvert, 2nd Baron Baltimore, English lawyer and politician, Governor of Newfoundland (d. 1675) 1640 – Amalia Catharina, German poet and composer (d. 1697) 1646 – Godfrey Kneller, German-English painter (d. 1723) 1673 – John Ker, Scottish spy (d. 1726) 1693 – Laurent Belissen, French composer (d. 1762) 1694 – Francis Hutcheson, Irish philosopher and academic (d. 1746) 1709 – Hermann Anton Gelinek, German-Italian monk and violinist (d. 1779) 1720 – Carl Fredrik Pechlin, Swedish general and politician (d. 1796) 1754 – Hipólito Ruiz López, Spanish botanist (d. 1816) 1758 – Friedrich Georg Weitsch, German painter (d. 1828) 1790 – Ferenc Kölcsey, Hungarian poet, critic, and politician (d. 1838) 1807 – Emilie Flygare-Carlén, Swedish author (d. 1892) 1814 – Esther Hobart Morris, American suffragette and judge (d. 1902) 1822 – George Stoneman, Jr., United States Army cavalry officer (d. 1894) 1839 – Nelson A. Miles, American general (d. 1925) 1851 – George Turner, Australian politician, 18th Premier of Victoria (d. 1916) 1856 – Thomas Anstey Guthrie, English journalist and author (d. 1934) 1857 – Cécile Chaminade, French pianist and composer (d. 1944) 1863 – Jean Leon Gerome Ferris, American painter (d. 1930) 1866 – Matthew Henson, American explorer (d. 1955) 1874 – Albert Stanley, 1st Baron Ashfield, English businessman and politician, President of the Board of Trade (d. 1948) 1875 – Arthur Bernardes, Brazilian lawyer and politician, 12th President of Brazil (d. 1955) 1876 – Varghese Payyappilly Palakkappilly, Indian-Syrian priest, founded the Sisters of the Destitute (d. 1929) 1879 – Bob Smith, American physician and surgeon, co-founded Alcoholics Anonymous (d. 1950) 1879 – Emiliano Zapata, Mexican general and politician (d. 1919) 1880 – Earle Page, Australian lawyer, academic, and politician, 11th Prime Minister of Australia (d. 1961) 1881 – Paul Ludwig Ewald von Kleist, German field marshal (d. 1954) 1882 – Ladislas Starevich, Russian-French animator, screenwriter, and cinematographer (d. 1965) 1884 – Sara Teasdale, American poet and educator (d. 1933) 1889 – Hans Egede Budtz, Danish actor (d. 1968) 1889 – Jack Ryder, Australian cricketer (d. 1977) 1891 – Adolf Busch, German violinist and composer (d. 1952) 1896 – Marjorie Kinnan Rawlings, American author and academic (d. 1953) 1898 – Marguerite Bise, French chef (d. 1965) 1901–present 1901 – Ernest Lawrence, American physicist and academic, Nobel Prize laureate (d. 1958) 1902 – Paul Dirac, English-American physicist and academic, Nobel Prize laureate (d. 1984) 1904 – Achille Varzi, Italian racing driver (d. 1948) 1905 – André Jolivet, French composer (d. 1974) 1907 – Benny Carter, American saxophonist, trumpet player, and composer (d. 2003) 1908 – Arthur Goldberg, American jurist and politician, 6th United States Ambassador to the United Nations (d. 1990) 1909 – Charles Lyttelton, 10th Viscount Cobham, English cricketer and politician, 9th Governor-General of New Zealand (d. 1977) 1909 – Jack Renshaw, Australian politician, 31st Premier of New South Wales (d. 1987) 1909 – Bill Voce, England cricketer and coach (d. 1984) 1910 – Jimmy Murphy, Welsh-English footballer and manager (d. 1989) 1910 – Sylvia Sidney, American actress (d. 1999) 1911 – Rosetta LeNoire, American actress (d. 2002) 1915 – James Elliott, American runner and coach (d. 1981) 1919 – Dino De Laurentiis, Italian actor and producer (d. 2010) 1919 – John David Wilson, English animator and producer (d. 2013) 1920 – Leo Chiosso, Italian songwriter and producer (d. 2006) 1920 – Jimmy Witherspoon, American jump blues singer (d. 1997) 1921 – William Asher, American director, producer, and screenwriter (d. 2012) 1921 – Webb Pierce, American singer-songwriter and guitarist (d. 1991) 1921 – Esther Williams, American swimmer and actress (d. 2013) 1922 – Rory Calhoun, American actor (d. 1999) 1922 – Rudi Gernreich, Austrian-American fashion designer, created the Monokini (d. 1985) 1922 – Gertrude Himmelfarb, American historian, author, and academic (d. 2019) 1922 – Károly Reich, Hungarian illustrator

protesters in the Jallianwala Bagh massacre by the British colonial troops three days earlier. 1919 – Polish–Lithuanian War: The Polish Army launches the Vilna offensive to capture Vilnius in modern Lithuania. 1922 – The Treaty of Rapallo, pursuant to which Germany and the Soviet Union re-establish diplomatic relations, is signed. 1925 – During the Communist St Nedelya Church assault in Sofia, Bulgaria, 150 are killed and 500 are wounded. 1941 – World War II: The Italian-German Tarigo convoy is attacked and destroyed by British ships. 1941 – World War II: The Nazi-affiliated Ustaše is put in charge of the Independent State of Croatia by the Axis powers after Operation 25 is effected. 1942 – King George VI awarded the George Cross to the people of Malta in appreciation of their heroism. 1943 – Albert Hofmann accidentally discovers the hallucinogenic effects of the research drug LSD. He intentionally takes the drug three days later on April 19. 1944 – World War II: Allied forces start bombing Belgrade, killing about 1,100 people. This bombing fell on the Orthodox Christian Easter. 1945 – World War II: The Red Army begins the final assault on German forces around Berlin, with nearly one million troops fighting in the Battle of the Seelow Heights. 1945 – The United States Army liberates Nazi Sonderlager (high security) prisoner-of-war camp Oflag IV-C (better known as Colditz). 1945 – More than 7,000 die when the German refugee ship Goya is sunk by a Soviet submarine. 1947 – An explosion on board a freighter in port causes the city of Texas City, Texas, to catch fire, killing almost 600. 1947 – Bernard Baruch first applies the term "Cold War" to describe the relationship between the United States and the Soviet Union. 1948 – The Organization of European Economic Co-operation is formed. 1961 – In a nationally broadcast speech, Cuban leader Fidel Castro declares that he is a Marxist–Leninist and that Cuba is going to adopt Communism. 1962 – Walter Cronkite begins his tenure as anchor of CBS Evening News. 1963 – Dr. Martin Luther King Jr. pens his Letter from Birmingham Jail while incarcerated in Birmingham, Alabama for protesting against segregation. 1972 – Apollo program: The launch of Apollo 16 from Cape Canaveral, Florida. 1990 – "Doctor Death", Jack Kevorkian, participates in his first assisted suicide. 1996 – Israel strikes a civilian house in Nabatieh Fawka, Lebanon, killing 9 people, including 7 children. 2001 – India and Bangladesh begin a five-day border conflict, but are unable to resolve the disputes about their border. 2003 – The Treaty of Accession is signed in Athens admitting ten new member states to the European Union. 2003 – Michael Jordan plays his final game with the National Basketball Association. 2007 – Virginia Tech shooting: Seung-Hui Cho guns down 32 people and injures 17 before committing suicide. 2008 – The U.S. Supreme Court rules in the Baze v. Rees decision that execution by lethal injection does not violate the Eighth Amendment ban against cruel and unusual punishment. 2012 – The trial for Anders Behring Breivik, the perpetrator of the 2011 Norway attacks, begins in Oslo, Norway. 2012 – The Pulitzer Prize winners were announced, it was the first time since 1977 that no book won the Fiction Prize. 2013 – A 7.8-magnitude earthquake strikes Sistan and Baluchestan Province, Iran, killing at least 35 people and injuring 117 others. 2013 – The 2013 Baga massacre is started when Boko Haram militants engage government soldiers in Baga. 2014 – The South Korean ferry MV Sewol capsizes and sinks near Jindo Island, killing 304 passengers and crew and leading to widespread criticism of the South Korean government, media, and shipping authorities. 2018 – The New York Times and the New Yorker win the Pulitzer Prize for Public Service for breaking news of the Harvey Weinstein sexual abuse scandal. Births Pre-1600 1488 – Jungjong of Joseon (d. 1544) 1495 – Petrus Apianus, German mathematician and astronomer (d. 1557) 1516 – Tabinshwehti, Burmese king (d. 1550) 1569 – John Davies, English poet and lawyer (d. 1626) 1601–1900 1635 – Frans van Mieris the Elder, Dutch painter (d. 1681) 1646 – Jules Hardouin-Mansart, French architect, designed the Château de Dampierre and Grand Trianon (probable; d. 1708) 1660 – Hans Sloane, Irish-English physician and academic (d. 1753) 1661 – Charles Montagu, 1st Earl of Halifax, English poet and politician, First Lord of the Treasury (d. 1715) 1682 – John Hadley, English mathematician, invented the octant (d. 1744) 1697 – Johann Gottlieb Görner, German organist and composer (d. 1778) 1728 – Joseph Black, French-Scottish physician and chemist (d. 1799) 1730 – Henry Clinton, English general and politician (d. 1795) 1755 – Louise Élisabeth Vigée Le Brun, French painter (d. 1842) 1786 – John Franklin, English admiral and politician, fourth Lieutenant Governor of Van Diemen's Land (d. 1847) 1800 – George Bingham, 3rd Earl of Lucan, English field marshal and politician (d. 1888) 1808 – Caleb Blood Smith, American journalist, lawyer, and politician, sixth United States Secretary of the Interior (d. 1864) 1821 – Ford Madox Brown, French-English soldier and painter (d. 1893) 1823 – Gotthold Eisenstein, German mathematician and academic (d. 1852) 1826 – Sir James Corry, 1st Baronet, British politician (d. 1891) 1827 – Octave Crémazie, Canadian poet and bookseller (d. 1879) 1839 – Antonio Starabba, Marchese di Rudinì, Italian politician, 12th Prime Minister of Italy (d. 1908) 1834 – Charles Lennox Richardson, English merchant (d. 1862) 1844 – Anatole France, French journalist, novelist, and poet, Nobel Prize laureate (d. 1924) 1847 – Hans Auer, Swiss-Austrian architect, designed the Federal Palace of Switzerland (d. 1906) 1848 – Kandukuri Veeresalingam, Indian author and activist (d. 1919) 1851 – Ponnambalam Ramanathan, Sri Lankan lawyer and politician, third Solicitor General of Sri Lanka (d. 1930) 1864 – Rose Talbot Bullard, American medical doctor and professor (d. 1915) 1865 – Harry Chauvel, Australian general (d. 1945) 1866 – José de Diego, Puerto Rican journalist, lawyer, and politician (d. 1918) 1867 – Wilbur Wright, American inventor (d. 1912) 1871 – John Millington Synge, Irish author, poet, and playwright (d. 1909) 1874 – Jōtarō Watanabe, Japanese general (d. 1936) 1878 – R. E. Foster, English cricketer and footballer (d. 1914) 1882 – Seth Bingham, American organist and composer (d. 1972) 1884 – Ronald Barnes, 3rd Baron Gorell, English cricketer, journalist, and politician (d. 1963) 1885 – Leó Weiner, Hungarian composer and educator (d. 1960) 1886 – Michalis Dorizas, Greek-American football player and javelin thrower (d. 1957) 1886 – Ernst Thälmann, German politician (d. 1944) 1888 – Billy Minter, English footballer and manager (d. 1940) 1889 – Charlie Chaplin, English actor, director, producer, screenwriter, and composer (d. 1977) 1890 – Fred Root, English cricketer and umpire (d. 1954) 1890 – Gertrude Chandler Warner, American author and educator (d. 1979) 1891 – Dorothy P. Lathrop, American author and illustrator (d. 1980) 1892 – Howard Mumford Jones, American author, critic, and academic (d. 1980) 1893 – Germaine Guèvremont, Canadian journalist and author (d. 1968) 1893 – John Norton, American hurdler (d. 1979) 1895 – Ove Arup, English-Danish engineer and businessman, founded Arup (d. 1988) 1896 – Robert Henry Best, American journalist (d. 1952) 1896 – Árpád Weisz, Hungarian footballer (d. 1944) 1899 – Osman Achmatowicz, Polish chemist and academic (d. 1988) 1900 – Polly Adler, Russian-American madam and author (d. 1962) 1901–present 1903 – Paul Waner, American baseball player and manager (d. 1965) 1904 – Fifi D'Orsay, Canadian-American vaudevillian, actress, and singer (d. 1983) 1905 – Frits Philips, Dutch businessman (d. 2005) 1907 – Joseph-Armand Bombardier, Canadian inventor and businessman, founded Bombardier Inc. (d. 1964) 1907 – August Eigruber, Austrian-German politician (d. 1947) 1908 – Ellis Marsalis, Sr., American businessman and activist (d. 2004) 1908 – Ray Ventura, French jazz bandleader (d. 1979) 1910 – Berton Roueché, American journalist and author (d. 1994) 1911 – Guy Burgess, English-Russian spy (d. 1963) 1913 – Les Tremayne, English actor (d. 2003) 1914 – John Hodiak, American actor (d. 1955) 1915 – Robert Speck, Canadian politician, first Mayor of Mississauga (d. 1972) 1916 – Behçet Necatigil, Turkish author, poet, and translator (d. 1979) 1917 – Victoria Eugenia Fernández de Córdoba, 18th Duchess of Medinaceli (d. 2013) 1917 – Barry Nelson, American actor (d. 2007) 1918 – Dick Gibson, English racing driver (d. 2010) 1918 – Hsuan Hua, Chinese-American monk and author (d. 1995) 1918 – Juozas Kazickas, Lithuanian-American businessman and philanthropist (d. 2014) 1918 – Spike Milligan, Irish actor, comedian, and writer (d. 2002) 1919 – Merce Cunningham, American dancer and choreographer (d. 2009) 1919 – Nilla Pizzi, Italian singer (d. 2011) 1919 – Pedro Ramírez Vázquez, Mexican architect, designed the Tijuana Cultural Center and National Museum of Anthropology (d. 2013) 1919 – Thomas Willmore, English geometer and academic (d. 2005) 1920 – Ananda Dassanayake, Sri Lankan politician (d. 2012) 1920 – Prince George Valdemar of Denmark (d. 1986) 1921 – Arlin Adams, American lawyer and judge (d. 2015) 1921 – Wolfgang Leonhard, German historian and author (d. 2014) 1921 – Peter Ustinov, English actor, director, producer, and screenwriter (d. 2004) 1922 – Kingsley Amis, English novelist, poet, and critic (d. 1995) 1922 – John Christopher, English author (d. 2012) 1922 – Lawrence N. Guarino, American colonel (d. 2014) 1922 – Leo Tindemans, Belgian politician, 43rd Prime Minister of Belgium (d. 2014) 1923 – Warren Barker, American composer (d. 2006) 1923 – Arch A. Moore Jr., American sergeant, lawyer, and politician, 28th Governor of West Virginia (d. 2015) 1924 – John Harvey-Jones, English academic and businessman (d. 2008) 1924 – Henry Mancini, American composer and conductor (d. 1994) 1924 – Rudy Pompilli, American saxophonist (d. 1976) 1924 – Madanjeet Singh, Indian diplomat, author, and philanthropist (d. 2013) 1926 – Pierre Fabre, French pharmacist, founded Laboratoires Pierre Fabre (d. 2013) 1927 – Edie Adams, American actress and singer (d. 2008) 1927 – Pope Benedict XVI 1927 – Rolf Schult, German actor (d. 2013) 1929 – Roy Hamilton, American singer (d. 1969) 1929 – Ralph Slatyer, Australian biologist and ecologist (d. 2012) 1929 – Ed Townsend, American singer-songwriter and producer (d. 2003) 1930 – Doug Beasy, Australian footballer and educator (d. 2013) 1930 – Herbie Mann, American flute player and composer (d. 2003) 1932 – Maury Meyers, American lawyer and politician (d. 2014) 1933 – Marcos Alonso Imaz, Spanish footballer (d. 2012) 1933 – Joan Bakewell, English journalist and author 1933 – Perry Botkin Jr., American composer, arranger and musician (d, 2021) 1933 – Vera Krepkina, Russian long jumper 1933 – Ike Pappas, American journalist and actor (d. 2008) 1934 – Vince Hill, English singer-songwriter 1934 – Robert Stigwood, Australian producer and manager (d. 2016) 1934 – Barrie Unsworth, Australian politician, 36th Premier of New South Wales 1934 – Vicar, Chilean cartoonist (d. 2012) 1935 – Marcel Carrière, Canadian director and screenwriter 1935 – Sarah Kirsch, German poet and author (d. 2013) 1935 – Lennart Risberg, Swedish boxer (d. 2013) 1935 – Dominique Venner, French journalist and historian (d. 2013) 1935 – Bobby Vinton, American singer 1936 – Vadim Kuzmin, Russian physicist and academic (d. 2015) 1937 – Gert Potgieter, South African hurdler and coach 1938 – Rich Rollins, American baseball player 1938 – Gordon Wilson, Scottish lawyer and politician (d. 2017) 1939 – John Amabile, American football player and coach (d. 2012) 1939 – Dusty Springfield, English singer and record producer (d. 1999) 1940 – Benoît Bouchard, Canadian academic and politician, 18th Canadian Minister of Transport 1940 – David Holford, Barbadian cricketer 1940 – Queen Margrethe II of Denmark 1940 – Joan Snyder, American painter 1940 – Thomas Stonor, 7th Baron Camoys, English banker and politician, Lord Chamberlain of the United Kingdom 1941 – Allan Segal, American director and producer (d. 2012) 1942 – Jim Lonborg, American baseball pitcher 1942 – Sir Frank Williams, English businessman, founded the Williams F1 Racing Team (d. 2021) 1943 – Lonesome Dave Peverett, English singer-songwriter and guitarist (d. 2000) 1943 – Petro Tyschtschenko, Austrian-German businessman 1943 – John Watkins, Australian cricketer 1945 – Tom Allen, American lawyer and politician 1946 – Margot Adler, American journalist and author (d. 2014) 1946 – Ernst Bakker, Dutch politician (d. 2014) 1946 – Johnnie Lewis, Liberian lawyer and politician, 18th Chief Justice of Liberia (d. 2015) 1946 – R. Carlos Nakai, American flute player 1947 – Kareem Abdul-Jabbar, American basketball player and coach 1947 – Gerry Rafferty, Scottish singer-songwriter (d. 2011) 1948 – Reg Alcock, Canadian businessman and politician, 17th Canadian President of the Treasury Board (d. 2011) 1950 – David Graf, American actor (d. 2001) 1950 – Colleen Hewett, Australian singer and actress 1951 – Ioan Mihai Cochinescu, Romanian author and photographer 1952 – Bill Belichick, American football player and coach 1952 – Michel Blanc, French actor and director 1952 – Esther Roth-Shahamorov, Israeli sprinter and hurdler 1952 – Billy West, American voice actor, singer-songwriter, and comedian 1953 – Peter Garrett, Australian singer-songwriter and politician 1953 – Jay O. Sanders, American actor 1954 – Ellen Barkin, American actress 1954 – John Bowe, Australian racing driver 1954 – Mike Zuke, Canadian ice hockey player 1955 – Bruce Bochy, American baseball player and manager 1955 – Henri, Grand Duke of Luxembourg 1956 – David M. Brown, American captain, pilot, and astronaut (d. 2003) 1956 – T Lavitz, American keyboard player, composer, and producer (d. 2010) 1956 – Lise-Marie Morerod, Swiss skier 1957 – Patricia De Martelaere, Belgian philosopher, author, and academic (d. 2009) 1958 – Tim Flach, English photographer and director 1958 – Ulf Wakenius, Swedish guitarist 1959 – Alison Ramsay, English-Scottish field hockey player and lawyer 1960 – Wahab Akbar, Filipino politician (d. 2007) 1960 – Rafael Benítez,

1915 – Robert Speck, Canadian politician, first Mayor of Mississauga (d. 1972) 1916 – Behçet Necatigil, Turkish author, poet, and translator (d. 1979) 1917 – Victoria Eugenia Fernández de Córdoba, 18th Duchess of Medinaceli (d. 2013) 1917 – Barry Nelson, American actor (d. 2007) 1918 – Dick Gibson, English racing driver (d. 2010) 1918 – Hsuan Hua, Chinese-American monk and author (d. 1995) 1918 – Juozas Kazickas, Lithuanian-American businessman and philanthropist (d. 2014) 1918 – Spike Milligan, Irish actor, comedian, and writer (d. 2002) 1919 – Merce Cunningham, American dancer and choreographer (d. 2009) 1919 – Nilla Pizzi, Italian singer (d. 2011) 1919 – Pedro Ramírez Vázquez, Mexican architect, designed the Tijuana Cultural Center and National Museum of Anthropology (d. 2013) 1919 – Thomas Willmore, English geometer and academic (d. 2005) 1920 – Ananda Dassanayake, Sri Lankan politician (d. 2012) 1920 – Prince George Valdemar of Denmark (d. 1986) 1921 – Arlin Adams, American lawyer and judge (d. 2015) 1921 – Wolfgang Leonhard, German historian and author (d. 2014) 1921 – Peter Ustinov, English actor, director, producer, and screenwriter (d. 2004) 1922 – Kingsley Amis, English novelist, poet, and critic (d. 1995) 1922 – John Christopher, English author (d. 2012) 1922 – Lawrence N. Guarino, American colonel (d. 2014) 1922 – Leo Tindemans, Belgian politician, 43rd Prime Minister of Belgium (d. 2014) 1923 – Warren Barker, American composer (d. 2006) 1923 – Arch A. Moore Jr., American sergeant, lawyer, and politician, 28th Governor of West Virginia (d. 2015) 1924 – John Harvey-Jones, English academic and businessman (d. 2008) 1924 – Henry Mancini, American composer and conductor (d. 1994) 1924 – Rudy Pompilli, American saxophonist (d. 1976) 1924 – Madanjeet Singh, Indian diplomat, author, and philanthropist (d. 2013) 1926 – Pierre Fabre, French pharmacist, founded Laboratoires Pierre Fabre (d. 2013) 1927 – Edie Adams, American actress and singer (d. 2008) 1927 – Pope Benedict XVI 1927 – Rolf Schult, German actor (d. 2013) 1929 – Roy Hamilton, American singer (d. 1969) 1929 – Ralph Slatyer, Australian biologist and ecologist (d. 2012) 1929 – Ed Townsend, American singer-songwriter and producer (d. 2003) 1930 – Doug Beasy, Australian footballer and educator (d. 2013) 1930 – Herbie Mann, American flute player and composer (d. 2003) 1932 – Maury Meyers, American lawyer and politician (d. 2014) 1933 – Marcos Alonso Imaz, Spanish footballer (d. 2012) 1933 – Joan Bakewell, English journalist and author 1933 – Perry Botkin Jr., American composer, arranger and musician (d, 2021) 1933 – Vera Krepkina, Russian long jumper 1933 – Ike Pappas, American journalist and actor (d. 2008) 1934 – Vince Hill, English singer-songwriter 1934 – Robert Stigwood, Australian producer and manager (d. 2016) 1934 – Barrie Unsworth, Australian politician, 36th Premier of New South Wales 1934 – Vicar, Chilean cartoonist (d. 2012) 1935 – Marcel Carrière, Canadian director and screenwriter 1935 – Sarah Kirsch, German poet and author (d. 2013) 1935 – Lennart Risberg, Swedish boxer (d. 2013) 1935 – Dominique Venner, French journalist and historian (d. 2013) 1935 – Bobby Vinton, American singer 1936 – Vadim Kuzmin, Russian physicist and academic (d. 2015) 1937 – Gert Potgieter, South African hurdler and coach 1938 – Rich Rollins, American baseball player 1938 – Gordon Wilson, Scottish lawyer and politician (d. 2017) 1939 – John Amabile, American football player and coach (d. 2012) 1939 – Dusty Springfield, English singer and record producer (d. 1999) 1940 – Benoît Bouchard, Canadian academic and politician, 18th Canadian Minister of Transport 1940 – David Holford, Barbadian cricketer 1940 – Queen Margrethe II of Denmark 1940 – Joan Snyder, American painter 1940 – Thomas Stonor, 7th Baron Camoys, English banker and politician, Lord Chamberlain of the United Kingdom 1941 – Allan Segal, American director and producer (d. 2012) 1942 – Jim Lonborg, American baseball pitcher 1942 – Sir Frank Williams, English businessman, founded the Williams F1 Racing Team (d. 2021) 1943 – Lonesome Dave Peverett, English singer-songwriter and guitarist (d. 2000) 1943 – Petro Tyschtschenko, Austrian-German businessman 1943 – John Watkins, Australian cricketer 1945 – Tom Allen, American lawyer and politician 1946 – Margot Adler, American journalist and author (d. 2014) 1946 – Ernst Bakker, Dutch politician (d. 2014) 1946 – Johnnie Lewis, Liberian lawyer and politician, 18th Chief Justice of Liberia (d. 2015) 1946 – R. Carlos Nakai, American flute player 1947 – Kareem Abdul-Jabbar, American basketball player and coach 1947 – Gerry Rafferty, Scottish singer-songwriter (d. 2011) 1948 – Reg Alcock, Canadian businessman and politician, 17th Canadian President of the Treasury Board (d. 2011) 1950 – David Graf, American actor (d. 2001) 1950 – Colleen Hewett, Australian singer and actress 1951 – Ioan Mihai Cochinescu, Romanian author and photographer 1952 – Bill Belichick, American football player and coach 1952 – Michel Blanc, French actor and director 1952 – Esther Roth-Shahamorov, Israeli sprinter and hurdler 1952 – Billy West, American voice actor, singer-songwriter, and comedian 1953 – Peter Garrett, Australian singer-songwriter and politician 1953 – Jay O. Sanders, American actor 1954 – Ellen Barkin, American actress 1954 – John Bowe, Australian racing driver 1954 – Mike Zuke, Canadian ice hockey player 1955 – Bruce Bochy, American baseball player and manager 1955 – Henri, Grand Duke of Luxembourg 1956 – David M. Brown, American captain, pilot, and astronaut (d. 2003) 1956 – T Lavitz, American keyboard player, composer, and producer (d. 2010) 1956 – Lise-Marie Morerod, Swiss skier 1957 – Patricia De Martelaere, Belgian philosopher, author, and academic (d. 2009) 1958 – Tim Flach, English photographer and director 1958 – Ulf Wakenius, Swedish guitarist 1959 – Alison Ramsay, English-Scottish field hockey player and lawyer 1960 – Wahab Akbar, Filipino politician (d. 2007) 1960 – Rafael Benítez, Spanish footballer and manager 1960 – Pierre Littbarski, German footballer and manager 1961 – Jarbom Gamlin, Indian lawyer and politician, seventh Chief Minister of Arunachal Pradesh (d. 2014) 1961 – Linda Ruth Williams, British film studies academic 1962 – Anna Dello Russo, Italian journalist 1962 – Douglas Elmendorf, American economist and politician 1962 – Ian MacKaye, American singer-songwriter, guitarist, and producer 1963 – Saleem Malik, Pakistani cricketer 1963 – Jimmy Osmond, American singer 1964 – David Kohan, American screenwriter and producer 1964 – Dave Pirner, American singer, songwriter and producer 1964 – Esbjörn Svensson, Swedish pianist (d. 2008) 1965 – Yves-François Blanchet, Canadian politician 1965 – Jon Cryer, American actor, director, producer, and screenwriter 1965 – Martin Lawrence, American actor, director, producer, and screenwriter 1966 – Jarle Vespestad, Norwegian drummer 1968 – Vickie Guerrero, American wrestler and manager 1968 – Rüdiger Stenzel, German runner 1969 – Patrik Järbyn, Swedish skier 1969 – Fernando Viña, American baseball player and sportscaster 1970 – Dero Goi, German singer-songwriter and drummer 1970 – Walt Williams, American basketball player 1971 – Cameron Blades, Australian rugby player 1971 – Selena, American singer-songwriter, actress, and fashion designer (d. 1995) 1971 – Seigo Yamamoto, Japanese racing driver 1971 – Natasha Zvereva, Belarusian tennis player 1972 – Conchita Martínez, Spanish-American tennis player 1972 – Tracy K. Smith, American poet and educator 1973 – Akon, Senegalese-American singer, rapper and songwriter 1973 – Charlotta Sörenstam, Swedish golfer 1973 – Teddy Cobeña, Spanish-Ecuadorian expressionist and representational sculptor 1976 – Lukas Haas, American actor and musician 1976 – Kelli O'Hara, American actress and singer 1977 – Freddie Ljungberg, Swedish footballer 1979 – Christijan Albers, Dutch racing driver 1979 – Lars Börgeling, German pole vaulter 1979 – Daniel Browne, New Zealand rugby player 1981 – Anestis Agritis, Greek footballer 1981 – Maya Dunietz, Israeli singer-songwriter and pianist 1981 – Matthieu Proulx, Canadian football player 1982 – Gina Carano, American mixed martial artist and actress 1982 – Boris Diaw, French basketball player 1982 – Jonathan Vilma, American football player 1983 – Marié Digby, American singer-songwriter, guitarist, and actress 1983 – Cat Osterman, American softball player 1984 – Teddy Blass, American composer and producer 1984 – Claire Foy, English actress 1984 – Tucker Fredricks, American speed skater 1984 – Paweł Kieszek, Polish footballer 1984 – Kerron Stewart, Jamaican sprinter 1985 – Luol Deng, Sudanese-English basketball player 1985 – Brendon Leonard, New Zealand rugby player 1985 – Taye Taiwo, Nigerian footballer 1986 – Shinji Okazaki, Japanese footballer 1986 – Peter Regin, Danish ice hockey player 1986 – Epke Zonderland, Dutch gymnast 1987 – Cenk Akyol, Turkish basketball player 1987 – Aaron Lennon, English international footballer 1988 – Kyle Okposo, American ice hockey player 1990 – Reggie Jackson, American basketball player 1990 – Vangelis Mantzaris, Greek basketball player 1990 – Tony McQuay, American sprinter 1991 – Nolan Arenado, American baseball player 1991 – Kim Kyung-jung, South Korean footballer 1993 – Chance the Rapper, American rapper 1993 – Mirai Nagasu, Japanese-American figure skater 1996 – Anya Taylor-Joy, Argentine-British actress Deaths Pre-1600 AD 69 – Otho, Roman emperor (b. AD 32) 665 – Fructuosus of Braga, French archbishop and saint 1090 – Sikelgaita, duchess of Apulia (b. c. 1040) 1113 – Sviatopolk II of Kiev (b. 1050) 1118 – Adelaide del Vasto, regent of Sicily, mother of Roger II of Sicily, queen of Baldwin I of Jerusalem 1198 – Frederick I, Duke of Austria (b. 1175) 1234 – Richard Marshal, 3rd Earl of Pembroke (b. 1191) 1375 – John Hastings, 2nd Earl of Pembroke, English nobleman and soldier (b. 1347) 1496 – Charles II, Duke of Savoy (b. 1489) 1587 – Anne Seymour, Duchess of Somerset (b. 1497) 1601–1900 1640 – Countess Charlotte Flandrina of Nassau (b. 1579) 1645 – Tobias Hume, Scottish soldier, viol player, and composer (b. 1569) 1687 – George Villiers, 2nd Duke of Buckingham, English poet and politician, Lord Lieutenant of the West Riding of Yorkshire (b. 1628) 1689 – Aphra Behn, English author and playwright (b. 1640) 1742 – Stefano Benedetto Pallavicino, Italian poet and translator (b. 1672) 1756 – Jacques Cassini, French astronomer (b. 1677) 1783 – Christian Mayer, Czech astronomer and educator (b. 1719) 1788 – Georges-Louis Leclerc, Comte de Buffon, French mathematician, cosmologist, and author (b. 1707) 1828 – Francisco Goya, Spanish-French painter and illustrator (b. 1746) 1846 – Domenico Dragonetti, Italian bassist and composer (b. 1763) 1850 – Marie Tussaud, French-English sculptor, founded the Madame Tussauds Wax Museum (b. 1761) 1859 – Alexis de Tocqueville, French historian and philosopher, French Minister of Foreign Affairs (b. 1805) 1879 – Bernadette Soubirous, French nun and saint (b. 1844) 1888 – Zygmunt Florenty Wróblewski, Polish

M, N, P and Q, with h: M to N, g: N to P, and f: P to Q, then as before. In short, composition of maps is always associative. Consider a set with three elements, A, B, and C. The following operation: {| class="wikitable" style="text-align:center" |- ! × !! A !! B !! C |- ! A | A || A || A |- ! B | A || B || C |- ! C | A || A || A |} is associative. Thus, for example, A(BC)=(AB)C = A. This operation is not commutative. Because matrices represent linear functions, and matrix multiplication represents function composition, one can immediately conclude that matrix multiplication is associative. Propositional logic Rule of replacement In standard truth-functional propositional logic, association, or associativity are two valid rules of replacement. The rules allow one to move parentheses in logical expressions in logical proofs. The rules (using logical connectives notation) are: and where "" is a metalogical symbol representing "can be replaced in a proof with". Truth functional connectives Associativity is a property of some logical connectives of truth-functional propositional logic. The following logical equivalences demonstrate that associativity is a property of particular connectives. The following are truth-functional tautologies. Associativity of disjunction: Associativity of conjunction: Associativity of equivalence: Joint denial is an example of a truth functional connective that is not associative. Non-associative operation A binary operation on a set S that does not satisfy the associative law is called non-associative. Symbolically, For such an operation the order of evaluation does matter. For example: Subtraction Division Exponentiation Vector cross product Also although addition is associative for finite sums, it is not associative inside infinite sums (series). For example, whereas Some non-associative operations are fundamental in mathematics. They appear often as the multiplication in structures called non-associative algebras, which have also an addition and a scalar multiplication. Examples are the octonions and Lie algebras. In Lie algebras, the multiplication satisfies Jacobi identity instead of the associative law; this allows abstracting the algebraic nature of infinitesimal transformations. Other examples are quasigroup, quasifield, non-associative ring, and commutative non-associative magmas. Nonassociativity of floating point calculation In mathematics, addition and multiplication of real numbers is associative. By contrast, in computer science, the addition and multiplication of floating point numbers is not associative, as rounding errors are introduced when dissimilar-sized values are joined together. To illustrate this, consider a floating point representation with a 4-bit mantissa: (1.0002×20 + 1.0002×20) + 1.0002×24 = 1.0002×2 + 1.0002×24 = 1.002×24 1.0002×20 + (1.0002×20 + 1.0002×24) = 1.0002×2 + 1.0002×24 = 1.002×24 Even though most computers compute with a 24 or 53 bits of mantissa, this is an important source of rounding error, and approaches such as the Kahan summation algorithm are ways to minimise the errors. It can be especially problematic in parallel computing. Notation for non-associative operations In general, parentheses must be used to indicate the order of evaluation if a non-associative operation appears more than once in an expression (unless the notation specifies the order in another way, like ). However, mathematicians agree on a particular order of evaluation for several common non-associative operations. This is simply a notational convention to avoid parentheses. A left-associative operation is a non-associative operation that is conventionally evaluated from left to right, i.e., while a right-associative operation is conventionally evaluated from right to left: Both left-associative and right-associative operations occur. Left-associative operations include the following: Subtraction and division of real numbers: Function application: This notation can be motivated by the currying isomorphism. Right-associative operations include the following: Exponentiation of real numbers in superscript notation: Exponentiation is commonly used with brackets or right-associatively because a repeated left-associative exponentiation operation is of little use. Repeated powers would mostly be rewritten with multiplication: Formatted correctly, the superscript inherently behaves as a set of parentheses; e.g. in the

altered. Since this holds true when performing addition and multiplication on any real numbers, it can be said that "addition and multiplication of real numbers are associative operations". Associativity is not the same as commutativity, which addresses whether the order of two operands affects the result. For example, the order does not matter in the multiplication of real numbers, that is, , so we say that the multiplication of real numbers is a commutative operation. However, operations such as function composition and matrix multiplication are associative, but (generally) not commutative. Associative operations are abundant in mathematics; in fact, many algebraic structures (such as semigroups and categories) explicitly require their binary operations to be associative. However, many important and interesting operations are non-associative; some examples include subtraction, exponentiation, and the vector cross product. In contrast to the theoretical properties of real numbers, the addition of floating point numbers in computer science is not associative, and the choice of how to associate an expression can have a significant effect on rounding error. Definition Formally, a binary operation ∗ on a set S is called associative if it satisfies the associative law: (x ∗ y) ∗ z = x ∗ (y ∗ z) for all x, y, z in S. Here, ∗ is used to replace the symbol of the operation, which may be any symbol, and even the absence of symbol (juxtaposition) as for multiplication. (xy)z = x(yz) = xyz for all x, y, z in S. The associative law can also be expressed in functional notation thus: . Generalized associative law If a binary operation is associative, repeated application of the operation produces the same result regardless of how valid pairs of parentheses are inserted in the expression. This is called the generalized associative law. For instance, a product of four elements may be written, without changing the order of the factors, in five possible ways: If the product operation is associative, the generalized associative law says that all these formulas will yield the same result. So unless the formula with omitted parentheses already has a different meaning (see below), the parentheses can be considered unnecessary and "the" product can be written unambiguously as As the number of elements increases, the number of possible ways to insert parentheses grows quickly, but they remain unnecessary for disambiguation. An example where this does not work is the logical biconditional . It is associative, thus A(BC) is equivalent to (AB)C, but ABC most commonly means (AB and BC), which is not equivalent. Examples Some examples of associative operations include the following. The concatenation of the three strings "hello", " ", "world" can be computed by concatenating the first two strings (giving "hello ") and appending the third string ("world"), or by joining the second and third string (giving " world") and concatenating the first string ("hello") with the result. The two methods produce the same result; string concatenation is associative (but not commutative). In arithmetic, addition and multiplication of real numbers are associative; i.e., Because of associativity, the grouping parentheses

that membership of the foundation is granted only to volunteers who have actively contributed to Apache projects. The ASF is considered a second generation open-source organization, in that commercial support is provided without the risk of platform lock-in. Among the ASF's objectives are: to provide legal protection to volunteers working on Apache projects; to prevent the Apache brand name from being used by other organizations without permission. The ASF also holds several ApacheCon conferences each year, highlighting Apache projects and related technology. History The history of the Apache Software Foundation is linked to the Apache HTTP Server, development beginning in February 1993. A group of eight developers started working on enhancing the NCSA HTTPd daemon. They came to be known as the Apache Group. On March 25, 1999, the Apache Software Foundation was formed. The first official meeting of the Apache Software Foundation was held on April 13, 1999. The initial members of the Apache Software Foundation consisted of the Apache Group: Brian Behlendorf, Ken Coar, Miguel Gonzales, Mark Cox, Lars Eilebrecht, Ralf S. Engelschall, Roy T. Fielding, Dean Gaudet, Ben Hyde, Jim Jagielski, Alexei Kosut, Martin Kraemer, Ben Laurie, Doug MacEachern, Aram Mirzadeh, Sameer Parekh, Cliff Skolnick, Marc Slemko, William (Bill) Stoddard, Paul Sutton, Randy Terbush and Dirk-Willem van Gulik. After a series of additional meetings to elect board members and resolve other legal matters regarding incorporation, the effective

terms. Each project is managed by a self-selected team of technical experts who are active contributors to the project. The ASF is a meritocracy, implying that membership of the foundation is granted only to volunteers who have actively contributed to Apache projects. The ASF is considered a second generation open-source organization, in that commercial support is provided without the risk of platform lock-in. Among the ASF's objectives are: to provide legal protection to volunteers working on Apache projects; to prevent the Apache brand name from being used by other organizations without permission. The ASF also holds several ApacheCon conferences each year, highlighting Apache projects and related technology. History The history of the Apache Software Foundation is linked to the Apache HTTP Server, development beginning in February 1993. A group of eight developers started working on enhancing the NCSA HTTPd daemon. They came to be known as the Apache Group. On March 25, 1999, the Apache Software Foundation was formed. The first official meeting of the Apache Software Foundation was held on April 13, 1999. The initial members of the Apache

idea of federal legislation enhancing and extending civil rights legislation to millions of Americans with disabilities gained bipartisan support in late 1988 and early 1989. In early 1989 both Congress and the newly inaugurated Bush White House worked separately, then jointly, to write legislation capable of expanding civil rights without imposing undue harm or costs on those already in compliance with existing rules and laws. Lobbying Over the years, key activists and advocates played an important role in lobbying members of the U.S. Congress to develop and pass the ADA, including Justin Whitlock Dart Jr., Patrisha Wright and others. Ms. Wright is known as "the General" for her work in coordinating the campaign to enact the ADA. She is widely considered the main force behind the campaign lobbying for the ADA. Support and opposition Support Senator Dole was a supporter and advocate for the bill. About the importance of making employment opportunities inclusive, Shirley Davis, director of global diversity and inclusion at the Society for Human Resource Management, said: "People with disabilities represent a critical talent pool that is underserved and underutilized". Opposition from religious groups The debate over the Americans with Disabilities Act led some religious groups to take opposite positions. The Association of Christian Schools International opposed the ADA in its original form, primarily because the ADA labeled religious institutions "public accommodations" and thus would have required churches to make costly structural changes to ensure access for all. The cost argument advanced by ACSI and others prevailed in keeping religious institutions from being labeled as "public accommodations". Church groups such as the National Association of Evangelicals testified against the ADA's Title I employment provisions on grounds of religious liberty. The NAE believed the regulation of the internal employment of churches was "... an improper intrusion [of] the federal government." Opposition from business interests Many members of the business community opposed the Americans with Disabilities Act. Testifying before Congress, Greyhound Bus Lines stated that the act had the potential to "deprive millions of people of affordable intercity public transportation and thousands of rural communities of their only link to the outside world." The US Chamber of Commerce argued that the costs of the ADA would be "enormous" and have "a disastrous impact on many small businesses struggling to survive." The National Federation of Independent Businesses, an organization that lobbies for small businesses, called the ADA "a disaster for small business." Pro-business conservative commentators joined in opposition, writing that the Americans with Disabilities Act was "an expensive headache to millions" that would not necessarily improve the lives of people with disabilities. "Capitol Crawl" Shortly before the act was passed, disability rights activists with physical disabilities coalesced in front of the Capitol Building, shed their crutches, wheelchairs, powerchairs and other assistive devices, and immediately proceeded to crawl and pull their bodies up all 100 of the Capitol's front steps, without warning. As the activists did so, many of them chanted "ADA now", and "Vote, Now". Some activists who remained at the bottom of the steps held signs and yelled words of encouragement at the "Capitol Crawlers". Jennifer Keelan, a second grader with cerebral palsy, was videotaped as she pulled herself up the steps, using mostly her hands and arms, saying "I'll take all night if I have to." This direct action is reported to have "inconvenienced" several senators and to have pushed them to approve the act. While there are those who do not attribute much overall importance to this action, the "Capitol Crawl" of 1990 is seen by some present-day disability activists in the United States as a central act for encouraging the ADA into law. Final passage Senator Tom Harkin (D-IA) authored what became the final bill and was its chief sponsor in the Senate. Harkin delivered part of his introduction speech in sign language, saying it was so his deaf brother could understand. George H. W. Bush, on signing the measure on July 26, 1990, said: ADA Amendments Act, 2008 The ADA defines a covered disability as a physical or mental impairment that substantially limits one or more major life activities, a history of having such an impairment, or being regarded as having such an impairment. The Equal Employment Opportunity Commission (EEOC) was charged with interpreting the 1990 law with regard to discrimination in employment. The EEOC developed regulations limiting an individual's impairment to one that "severely or significantly restricts" a major life activity. The ADAAA directed the EEOC to amend its regulations and replace "severely or significantly" with "substantially limits", a more lenient standard. On September 25, 2008, President George W. Bush signed the ADA Amendments Act of 2008 (ADAAA) into law. The amendment broadened the definition of "disability", thereby extending the ADA's protections to a greater number of people. The ADAAA also added to the ADA examples of "major life activities" including, but not limited to, "caring for oneself, performing manual tasks, seeing, hearing, eating, sleeping, walking, standing, lifting, bending, speaking, breathing, learning, reading, concentrating, thinking, communicating, and working" as well as the operation of several specified major bodily functions. The act overturned a 1999 US Supreme Court case that held that an employee was not disabled if the impairment could be corrected by mitigating measures; it specifically provides that such impairment must be determined without considering such ameliorative measures. It also overturned the court restriction that an impairment that substantially limits one major life activity must also limit others to be considered a disability. In 2008, the United States House Committee on Education and Labor stated that the amendment "makes it absolutely clear that the ADA is intended to provide broad coverage to protect anyone who faces discrimination on the basis of disability." Thus the ADAAA led to broader coverage of impaired employees. 25th anniversary, 2015 the ADA had improved access to public services, the built environment (e.g., crosswalks with curb cuts and accessible pedestrian signals), understanding of the abilities of people with disabilities, established a right to equal access to public services and has demonstrated the contributions which people with disabilities can make to the economy. Disparities have remained in employment, earned income, Internet access, transportation, housing, and educational attainment and the disabled remain at a disadvantage with respect to health and health care. On July 20, 2015, the White House held a reception to celebrate the 25th anniversary of the ADA. The introductory remarks were given by Haben Girma, a deafblind disability rights lawyer and advocate. Among the guests was Alice Wong, a disability rights activist who came via telepresence robot. Web Content Accessibility Guidelines, 2019 In October 2019, the Supreme Court declined to resolve a circuit split as to whether websites are covered by the ADA. The Court turned down an appeal from Domino's Pizza and let stand a U.S. 9th Circuit Court of Appeals ruling which held that the Americans With Disabilities Act protects access not just to brick-and-mortar public accommodations, but also to the websites and apps of those businesses. Reaction Criticism Employment The ADA has been criticized on the grounds that it decreases the employment rate for people with disabilities and raises the cost of doing business for employers, in large part due to the additional legal risks, which employers quietly avoid by not hiring people with disabilities. Some researchers believe that the law has been ineffectual. Between 1991 (after the enactment of the ADA) and 1995, the employment rate of men with disabilities dropped by 7.8% regardless of age, educational level, or type of disability, with the most affected being young, less-educated and mentally disabled men. Despite the many criticisms, a causal link between the ADA and declining disabled employment over much of the 1990s has not been definitively identified. In 2001, for men of all working ages and women under 40, Current Population Survey data showed a sharp drop in the employment of disabled workers, leading at least two economists to attribute the cause to the Act. By contrast, a study in 2003 found that while the Act may have led to short term reactions by employers, in the long term, there were either positive or neutral consequences for wages and employment. In 2005, the rate of employment among disabled people increased to 45% of the population of disabled people. "Professional plaintiffs" Since enforcement of the act began in July 1992, it has quickly become a major component of employment law. The ADA allows private plaintiffs to receive only injunctive relief (a court order requiring the public accommodation to remedy violations of the accessibility regulations) and attorneys' fees, and does not provide monetary rewards to private plaintiffs who sue non-compliant businesses. Unless a state law, such as the California Unruh Civil Rights Act, provides for monetary damages to private plaintiffs, persons with disabilities do not obtain direct financial benefits from suing businesses that violate the ADA. The attorneys' fees provision of Title III does provide incentive for lawyers to specialize and engage in serial ADA litigation, but a disabled plaintiff does not obtain a financial reward from attorneys' fees unless they act as their own attorney, or as mentioned above, a disabled plaintiff resides in a state that provides for minimum compensation and court fees in lawsuits. Moreover, there may be a benefit to these "private attorneys general" who identify and compel the correction of illegal conditions: they may increase the number of public accommodations accessible to persons with disabilities. "Civil rights law depends heavily on private enforcement. Moreover, the inclusion of penalties and damages is the driving force that facilitates voluntary compliance with the ADA." Courts have noted: As a result, most ADA suits are brought by a small number of private plaintiffs who view themselves as champions of the disabled. For the ADA to yield its promise of equal access for the disabled, it may indeed be necessary and desirable for committed individuals to bring serial litigation advancing the time when public accommodations will be compliant with the ADA. However, in states that have enacted laws that allow private individuals to win monetary awards from non-compliant businesses (as of 2008, these include California, Florida, Hawaii, and Illinois), "professional plaintiffs" are typically found. At least one of these plaintiffs in California has been barred by courts from filing lawsuits unless he receives prior court permission. Through the end of fiscal year 1998, 86% of the 106,988 ADA charges filed with and resolved by the Equal Employment Opportunity Commission, were either dropped or investigated and dismissed by EEOC but not without imposing opportunity costs and legal fees on employers. Case law There have been some notable cases regarding the ADA. For example, two major hotel room marketers (Expedia.com and Hotels.com) with their business presence on the Internet were sued because its customers with disabilities could not reserve hotel rooms through their websites without substantial extra efforts that persons without disabilities were not required to perform. These represent a major potential expansion of the ADA in that this, and other similar suits (known as "bricks vs. clicks"), seeks to expand the ADA's authority to cyberspace, where entities may not have actual physical facilities that are required to comply. Green v. State of California Green v. State of California, No. S137770 (Cal. Aug. 23, 2007) was a case in which the majority of the Supreme Court in California was faced with deciding whether the employee suing the state is required to prove he is able to perform "essential" job duties, regardless of whether or not there was "reasonable accommodation," or if the employer must prove the victim was unable to do so. The court ruled the burden was on the employee, not the employer, and reversed a disputed decision by the courts. Plaintiff attorney David Greenberg brought forth considerations of the concept that, even in the state of California, employers do not have to employ a worker who is unable to perform "essential job functions" with "reasonable accommodation." Forcing employers to do so "would defy logic and establish a poor public policy in employment matters." National Federation of the Blind v. Target Corporation National Federation of the Blind v. Target Corporation was a case where a major retailer, Target Corp., was sued because their web designers failed to design its website to enable persons with low or no vision to use it. Board of Trustees of the University of Alabama v. Garrett Board of Trustees of the University of Alabama v. Garrett was a United States Supreme Court case about Congress's enforcement powers under the Fourteenth Amendment to the Constitution. It decided that Title I of the Americans with Disabilities Act was unconstitutional insofar as it allowed private citizens to sue states for money damages. Barden v. The City of Sacramento Barden v. The City of Sacramento, filed in March 1999, claimed that the City of Sacramento failed to comply with the ADA when, while making public street improvements, it did not bring its sidewalks into compliance with the ADA. Certain issues were resolved in Federal Court. One issue, whether sidewalks were covered by the ADA, was appealed to the 9th Circuit Court of Appeals, which ruled that sidewalks were a "program" under ADA and must be made accessible to persons with disabilities. The ruling was later appealed to the U.S. Supreme Court, which refused to hear the case, letting stand the ruling of the 9th Circuit Court. Bates v. UPS Bates v. UPS (begun in 1999) was the first equal opportunity employment class action brought on behalf of Deaf and Hard of Hearing (d/Deaf/HoH) workers throughout the country concerning workplace discrimination. It established legal precedence for d/Deaf/HoH Employees and Customers to be fully covered under the ADA. Key findings included UPS failed to address communication barriers and to ensure equal conditions and opportunities for deaf employees; Deaf employees were routinely excluded from workplace information, denied opportunities for promotion, and exposed to unsafe conditions due to lack of accommodations by UPS; UPS also lacked a system to alert these employees as to emergencies, such as fires or chemical spills, to ensure that they would safely evacuate their facility; and UPS had no policy to ensure that deaf applicants and employees actually received effective communication in the workplace. The outcome was that UPS agreed to pay a $5.8 million award and agreed to a comprehensive accommodations program that was implemented in their facilities throughout the country. Spector v. Norwegian Cruise Line Ltd. Spector v. Norwegian Cruise Line Ltd. was a case that was decided by the United States Supreme Court in 2005. The defendant argued that as a vessel flying the flag of a foreign nation it was exempt from the requirements of the ADA. This argument was accepted by a federal court in Florida and, subsequently, the Fifth Circuit Court of Appeals. However, the U.S. Supreme Court reversed the ruling of the lower courts on the basis that Norwegian Cruise Lines was a business headquartered in the United States whose clients were predominantly Americans and, more importantly, operated out of port facilities throughout the United States. Olmstead v. L.C. Olmstead v. L.C. was a case before the United States Supreme Court in 1999. The two plaintiffs, L.C. and E.W., were institutionalized in Georgia for diagnosed mental retardation and schizophrenia. Clinical assessments by the state determined that the plaintiffs could be appropriately treated in a community setting rather than the state institution. The plaintiffs sued the state of Georgia and the institution for being inappropriately treated and housed in the institutional setting rather than being treated in one of the state's community-based treatment facilities. The Supreme Court decided under Title II of the ADA that mental illness is a form of disability and therefore covered under the ADA, and that unjustified institutional isolation of a person with a disability is a form of discrimination because it "...perpetuates unwarranted assumptions that persons so isolated are incapable or unworthy of participating in community life." The court added, "Confinement in an institution severely diminishes the everyday life activities of individuals, including family relations, social contacts, work options, economic independence, educational advancement, and cultural enrichment." Therefore, under Title II no person with a disability can be unjustly excluded from participation in or be denied the benefits of services, programs or activities of any public entity. Michigan Paralyzed Veterans of America v. The University of Michigan This was a case filed before The United States District Court for the Eastern District of Michigan Southern Division on behalf of the Michigan Paralyzed Veterans of America against University of Michigan – Michigan Stadium claiming that Michigan Stadium violated the Americans with Disabilities Act in its $226-million renovation by failing to add enough seats for disabled fans or accommodate the needs for disabled restrooms, concessions and parking.

physical disabilities coalesced in front of the Capitol Building, shed their crutches, wheelchairs, powerchairs and other assistive devices, and immediately proceeded to crawl and pull their bodies up all 100 of the Capitol's front steps, without warning. As the activists did so, many of them chanted "ADA now", and "Vote, Now". Some activists who remained at the bottom of the steps held signs and yelled words of encouragement at the "Capitol Crawlers". Jennifer Keelan, a second grader with cerebral palsy, was videotaped as she pulled herself up the steps, using mostly her hands and arms, saying "I'll take all night if I have to." This direct action is reported to have "inconvenienced" several senators and to have pushed them to approve the act. While there are those who do not attribute much overall importance to this action, the "Capitol Crawl" of 1990 is seen by some present-day disability activists in the United States as a central act for encouraging the ADA into law. Final passage Senator Tom Harkin (D-IA) authored what became the final bill and was its chief sponsor in the Senate. Harkin delivered part of his introduction speech in sign language, saying it was so his deaf brother could understand. George H. W. Bush, on signing the measure on July 26, 1990, said: ADA Amendments Act, 2008 The ADA defines a covered disability as a physical or mental impairment that substantially limits one or more major life activities, a history of having such an impairment, or being regarded as having such an impairment. The Equal Employment Opportunity Commission (EEOC) was charged with interpreting the 1990 law with regard to discrimination in employment. The EEOC developed regulations limiting an individual's impairment to one that "severely or significantly restricts" a major life activity. The ADAAA directed the EEOC to amend its regulations and replace "severely or significantly" with "substantially limits", a more lenient standard. On September 25, 2008, President George W. Bush signed the ADA Amendments Act of 2008 (ADAAA) into law. The amendment broadened the definition of "disability", thereby extending the ADA's protections to a greater number of people. The ADAAA also added to the ADA examples of "major life activities" including, but not limited to, "caring for oneself, performing manual tasks, seeing, hearing, eating, sleeping, walking, standing, lifting, bending, speaking, breathing, learning, reading, concentrating, thinking, communicating, and working" as well as the operation of several specified major bodily functions. The act overturned a 1999 US Supreme Court case that held that an employee was not disabled if the impairment could be corrected by mitigating measures; it specifically provides that such impairment must be determined without considering such ameliorative measures. It also overturned the court restriction that an impairment that substantially limits one major life activity must also limit others to be considered a disability. In 2008, the United States House Committee on Education and Labor stated that the amendment "makes it absolutely clear that the ADA is intended to provide broad coverage to protect anyone who faces discrimination on the basis of disability." Thus the ADAAA led to broader coverage of impaired employees. 25th anniversary, 2015 the ADA had improved access to public services, the built environment (e.g., crosswalks with curb cuts and accessible pedestrian signals), understanding of the abilities of people with disabilities, established a right to equal access to public services and has demonstrated the contributions which people with disabilities can make to the economy. Disparities have remained in employment, earned income, Internet access, transportation, housing, and educational attainment and the disabled remain at a disadvantage with respect to health and health care. On July 20, 2015, the White House held a reception to celebrate the 25th anniversary of the ADA. The introductory remarks were given by Haben Girma, a deafblind disability rights lawyer and advocate. Among the guests was Alice Wong, a disability rights activist who came via telepresence robot. Web Content Accessibility Guidelines, 2019 In October 2019, the Supreme Court declined to resolve a circuit split as to whether websites are covered by the ADA. The Court turned down an appeal from Domino's Pizza and let stand a U.S. 9th Circuit Court of Appeals ruling which held that the Americans With Disabilities Act protects access not just to brick-and-mortar public accommodations, but also to the websites and apps of those businesses. Reaction Criticism Employment The ADA has been criticized on the grounds that it decreases the employment rate for people with disabilities and raises the cost of doing business for employers, in large part due to the additional legal risks, which employers quietly avoid by not hiring people with disabilities. Some researchers believe that the law has been ineffectual. Between 1991 (after the enactment of the ADA) and 1995, the employment rate of men with disabilities dropped by 7.8% regardless of age, educational level, or type of disability, with the most affected being young, less-educated and mentally disabled men. Despite the many criticisms, a causal link between the ADA and declining disabled employment over much of the 1990s has not been definitively identified. In 2001, for men of all working ages and women under 40, Current Population Survey data showed a sharp drop in the employment of disabled workers, leading at least two economists to attribute the cause to the Act. By contrast, a study in 2003 found that while the Act may have led to short term reactions by employers, in the long term, there were either positive or neutral consequences for wages and employment. In 2005, the rate of employment among disabled people increased to 45% of the population of disabled people. "Professional plaintiffs" Since enforcement of the act began in July 1992, it has quickly become a major component of employment law. The ADA allows private plaintiffs to receive only injunctive relief (a court order requiring the public accommodation to remedy violations of the accessibility regulations) and attorneys' fees, and does not provide monetary rewards to private plaintiffs who sue non-compliant businesses. Unless a state law, such as the California Unruh Civil Rights Act, provides for monetary damages to private plaintiffs, persons with disabilities do not obtain direct financial benefits from suing businesses that violate the ADA. The attorneys' fees provision of Title III does provide incentive for lawyers to specialize and engage in serial ADA litigation, but a disabled plaintiff does not obtain a financial reward from attorneys' fees unless they act as their own attorney, or as mentioned above, a disabled plaintiff resides in a state that provides for minimum compensation and court fees in lawsuits. Moreover, there may be a benefit to these "private attorneys general" who identify and compel the correction of illegal conditions: they may increase the number of public accommodations accessible to persons with disabilities. "Civil rights law depends heavily on private enforcement. Moreover, the inclusion of penalties and damages is the driving force that facilitates voluntary compliance with the ADA." Courts have noted: As a result, most ADA suits are brought by a small number of private plaintiffs who view themselves as champions of the disabled. For the ADA to yield its promise of equal access for the disabled, it may indeed be necessary and desirable for committed individuals to bring serial litigation advancing the time when public accommodations will be compliant with the ADA. However, in states that have enacted laws that allow private individuals to win monetary awards from non-compliant businesses (as of 2008, these include California, Florida, Hawaii, and Illinois), "professional plaintiffs" are typically found. At least one of these plaintiffs in California has been barred by courts from filing lawsuits unless he receives prior court permission. Through the end of fiscal year 1998, 86% of the 106,988 ADA charges filed with and resolved by the Equal Employment Opportunity Commission, were either dropped or investigated and dismissed by EEOC but not without imposing opportunity costs and legal fees on employers. Case law There have been some notable cases regarding the ADA. For example, two major hotel room marketers (Expedia.com and Hotels.com) with their business presence on the Internet were sued because its customers with disabilities could not reserve hotel rooms through their websites without substantial extra efforts that persons without disabilities were not required to perform. These represent a major potential expansion of the ADA in that this, and other similar suits (known as "bricks vs. clicks"), seeks to expand the ADA's authority to cyberspace, where entities may not have actual physical facilities that are required to comply. Green v. State of California Green v. State of California, No. S137770 (Cal. Aug. 23, 2007) was a case in which the majority of the Supreme Court in California was faced with deciding whether the employee suing the state is required to prove he is able to perform "essential" job duties, regardless of whether or not there was "reasonable accommodation," or if the employer must prove the victim was unable to do so. The court ruled the burden was on the employee, not the employer, and reversed a disputed decision by the courts. Plaintiff attorney David Greenberg brought forth considerations of the concept that, even in the state of California, employers do not have to employ a worker who is unable to perform "essential job functions" with "reasonable accommodation." Forcing employers to do so "would defy logic and establish a poor public policy in employment matters." National Federation of the Blind v. Target Corporation National Federation of the Blind v. Target Corporation was a case where a major retailer, Target Corp., was sued because their web designers failed to design its website to enable persons with low or no vision to use it. Board of Trustees of the University of Alabama v. Garrett Board of Trustees of the University of Alabama v. Garrett was a United States Supreme Court case about Congress's enforcement powers under the Fourteenth Amendment to the Constitution. It decided that Title I of the Americans with Disabilities Act was unconstitutional insofar as it allowed private citizens to sue states for money damages. Barden v. The City of Sacramento Barden v. The City of Sacramento, filed in March 1999, claimed that the City of Sacramento failed to comply with the ADA when, while making public street improvements, it did not bring its sidewalks into compliance with the ADA. Certain issues were resolved in Federal Court. One issue, whether sidewalks were covered by the ADA, was appealed to the 9th Circuit Court of Appeals, which ruled that sidewalks were a "program" under ADA and must be made accessible to persons with disabilities. The ruling was later appealed to the U.S. Supreme Court, which refused to hear the case, letting stand the ruling of the 9th Circuit Court. Bates v. UPS Bates v. UPS (begun in 1999) was the first equal opportunity employment class action brought on behalf of Deaf and Hard of Hearing (d/Deaf/HoH) workers throughout the country concerning workplace discrimination. It established legal precedence for d/Deaf/HoH Employees and Customers to be fully covered under the ADA. Key findings included UPS failed to address communication barriers and to ensure equal conditions and opportunities for deaf employees; Deaf employees were routinely excluded from workplace information, denied opportunities for promotion, and exposed to unsafe conditions due to lack of accommodations by UPS; UPS also lacked a system to alert these employees as to emergencies, such as fires or chemical spills, to ensure that they would safely evacuate their facility; and UPS had no policy to ensure that deaf applicants and employees actually received effective communication in the workplace. The outcome was that UPS agreed to pay a $5.8 million award and agreed to a comprehensive accommodations program that was implemented in their facilities throughout the country. Spector v. Norwegian Cruise Line Ltd. Spector v. Norwegian Cruise Line Ltd. was a case that was decided by the United States Supreme Court in 2005. The defendant argued that as a vessel flying the flag of a foreign nation it was exempt from the requirements of the ADA. This argument was accepted by a federal court in Florida and, subsequently, the Fifth Circuit Court of Appeals. However, the U.S. Supreme Court reversed the ruling of the lower courts on the basis that Norwegian Cruise Lines was a business headquartered in the United States whose clients were predominantly Americans and, more importantly, operated out of port facilities throughout the United States. Olmstead v. L.C. Olmstead v. L.C. was a case before the United States Supreme Court in 1999. The two plaintiffs, L.C. and E.W., were institutionalized in Georgia for diagnosed mental retardation and schizophrenia. Clinical assessments by the state determined that the plaintiffs could be appropriately treated in a community setting rather than the state institution. The plaintiffs sued the state of Georgia and the institution for being inappropriately treated and housed in the institutional setting rather than being treated in one of the state's community-based treatment facilities. The Supreme Court decided under Title II of the ADA that mental illness is a form of disability and therefore covered under the ADA, and that unjustified institutional isolation of a person with a disability is a form of discrimination because it "...perpetuates unwarranted assumptions that persons so isolated are incapable or unworthy of participating in community life." The court added, "Confinement in an institution severely diminishes the everyday life activities of individuals, including family relations, social contacts, work options, economic independence, educational advancement, and cultural enrichment." Therefore, under Title II no person with a disability can be unjustly excluded from participation in or be denied the benefits of services, programs or activities of any public entity. Michigan Paralyzed Veterans of America v. The University of Michigan This was a case filed before The United States District Court for the Eastern District of Michigan Southern Division on behalf of the Michigan Paralyzed Veterans of America against University of Michigan – Michigan Stadium claiming that Michigan Stadium violated the Americans with Disabilities Act in its $226-million renovation by failing to add enough seats for disabled fans or accommodate the needs for disabled restrooms, concessions and parking. Additionally, the distribution of the accessible seating was at issue, with nearly all the seats being provided in the end-zone areas. The U.S. Department of Justice assisted in the suit filed by attorney Richard Bernstein of The Law Offices of Sam Bernstein in Farmington Hills, Michigan, which was settled in March 2008. The settlement required the stadium to add 329 wheelchair seats throughout the stadium by 2010, and an additional 135 accessible seats in clubhouses to go along with the existing 88 wheelchair seats. This case was significant because it set a precedent for the uniform distribution of accessible seating and gave the DOJ the opportunity to clarify previously unclear rules. The agreement now is a blueprint for all stadiums and other public facilities regarding accessibility. Paralyzed Veterans of America v. Ellerbe Becket Architects and Engineers One of the first major ADA lawsuits, Paralyzed Veterans of America v. Ellerbe Becket Architects and Engineers (PVA 1996) was focused on the wheelchair accessibility of a stadium project that was still in the design phase, MCI Center (now known as Capital One Arena) in Washington, D.C. Previous to this case, which was filed only five years after the ADA was passed, the DOJ was unable or unwilling to provide clarification on the distribution requirements for accessible wheelchair locations in large assembly spaces. While Section 4.33.3 of ADAAG makes reference to lines of sight, no specific reference is made to seeing over standing patrons. The MCI Center, designed by Ellerbe Becket Architects & Engineers, was designed with too few wheelchair and companion seats, and the ones that were included did not provide sight lines that would enable the wheelchair user to view the playing area while the spectators in front of them were standing. This case and another related case established precedent on seat distribution and sight lines issues for ADA enforcement that continues to present day. Toyota Motor Manufacturing, Kentucky, Inc. v. Williams Toyota Motor Manufacturing, Kentucky, Inc. v. Williams, was a case in which the Supreme Court interpreted the meaning of the phrase "substantially impairs" as used in the Americans with Disabilities Act. It reversed a Sixth Court of Appeals decision to grant a partial summary judgment in favor of the respondent, Ella Williams, that qualified her inability to perform manual job-related tasks as a disability. The Court held that the "major life activity" definition in evaluating the performance of manual tasks focuses the inquiry on whether Williams was unable to perform a range of tasks central to most people in carrying out the activities of daily living. The issue is not whether Williams was unable to perform her specific job tasks. Therefore, the determination of whether an impairment rises to the level of a disability is not limited to activities in the workplace solely, but rather to manual tasks in life in general. When the Supreme Court applied this standard, it found that the Court of Appeals had incorrectly determined the presence of a disability because it relied solely on her inability to perform specific manual work tasks, which was insufficient in proving the presence of a disability. The Court of Appeals should have taken into account the evidence presented that Williams retained the ability to do personal tasks and household chores, such activities being the nature of tasks most people do in their daily lives, and placed too much emphasis on her job disability. Since the evidence showed that Williams was performing normal daily tasks, it ruled that the Court of Appeals erred when it found that Williams was disabled. This ruling is now, however, no longer good law—it was invalidated by the ADAAA. In fact, Congress explicitly cited Toyota v. Williams in the text of the ADAAA itself as one of its driving influences for passing the ADAAA. US Airways, Inc. v. Barnett Decided by the US Supreme Court in 2002, this case held that even requests for accommodation that might seem reasonable on their face, e.g., a transfer to a different position, can be rendered unreasonable because it would require a violation of the company's seniority system. While the court held that, in general, a violation of a seniority system renders an otherwise reasonable accommodation unreasonable, a plaintiff can present evidence that, despite the seniority system, the accommodation is reasonable in the specific case at hand, e.g., the plaintiff could offer evidence that the seniority system is so often disregarded that another exception wouldn't make a difference. Importantly, the court held that the defendant need not provide proof that this particular application of the seniority system should prevail, and that, once the defendant showed that the accommodation violated the seniority system, it fell to Barnett to show it was nevertheless reasonable. In this case, Barnett was a US Airways employee who injured his back, rendering him physically unable to perform his cargo-handling job. Invoking seniority, he transferred to a less-demanding mailroom job, but this position later became open to seniority-based bidding and was bid on by more senior employees. Barnett requested the accommodation of being allowed to stay on in the less-demanding mailroom job. US Airways denied his request, and he lost his job. The Supreme Court decision invalidated both the approach of the district court, which found that the mere presence and importance of the seniority system was enough to warrant a summary judgment in favor of US Airways, as well as the circuit court's approach that interpreted 'reasonable accommodation' as 'effective accommodation.' Access Now v. Southwest Airlines Access Now v. Southwest Airlines was a 2002 case where the District Court decided that the website of Southwest Airlines was not in violation of the Americans with Disabilities Act,

sold for $390,000. In November 2013, a working unit speculated to have been part of the original lot of 50 boards delivered to the Byte Shop was listed by Auction Team Breker for €180,000 ($242,820), but failed to sell during the auction. Immediately following the close of bidding, a private collector purchased it for €246,000 ($330,000). This board was marked "01-0046," matching the numbering placed on other units sold to the Byte Shop and included the original operation manuals, software cassettes, and shipping box autographed by Steve Wozniak. The board also bears Wozniak's signature. In October 2014, a working, early Apple I was sold at auction for $905,000 to the Henry Ford Museum in Dearborn, Michigan. The sale included the keyboard, monitor, cassette decks and a manual. The auction was run by Bonhams. On December 13, 2014, a fully functioning, early Apple I was sold at auction for $365,000 by auction house Christie's. The sale included a keyboard, custom case, original manual and a check labeled "Purchased July 1976 from Steve Jobs in his parents' garage in Los Altos". On May 30, 2015, a woman reportedly dropped off boxes of electronics for disposal at an electronics recycling center in the Silicon Valley of Northern California. Included in the items removed from her garage after the death of her husband was an original Apple I computer, which the recycling firm sold for $200,000 to a private collector. It is the company's practice to give back 50% of the proceeds to the original owner when an item is sold, so they want to find the mystery donor. On September 21, 2015, an Apple I bearing the Byte Shop number 01-0059 was listed by Bonhams Auctions as part of their "History of Science and Technology" auction with a starting bid of US$300,000. The machine was described as, "in near perfect condition." The owner, Tom Romkey, "...only used the Apple-1 once or twice, and ...set it on a shelf, and did not touch it again." The machine did not sell. However, Glenn and Shannon Dellimore, the co-founders of GLAMGLOW, a beauty company which they sold to Estee Lauder Companies, bought it after the auction through Bonhams Auction house. On the 40th Anniversary of Apple Computers 2016 the Dellimore's working Apple-1 went on loan and on display in 'Artifact' at the V&A Museum in London, England. On August 26, 2016, (the 40th Anniversary year of Apple Computers), the rarest Apple-1 in existence, an Apple-I prototype made and hand-built by Steve Jobs himself (according to Apple-1 expert Corey Cohen) and dubbed the 'Holy Grail' of computers was sold for $815,000 to winning bidders Glenn and Shannon Dellimore, the co-founders of cosmetics firm Glamglow, in an auction by Charitybuzz. The for-profit internet company that raises funds for nonprofit organizations declared that ten percent of the proceeds will go to the Leukemia and Lymphoma Society, based in New York. On April 15, 2017, an Apple I removed from Steve Jobs's office by Apple quality control engineer Don Hutmacher was placed on display at Living Computers: Museum + Labs. This Apple I was modified by Dan Kottke and Bill Fernandez. This previously unknown unit was purchased from Hutmacher's heirs for an undisclosed amount. On September 25, 2018, a functioning Apple I was purchased at a Dallas auction for $375,000 by an anonymous buyer. On May 23, 2019, an Apple I was purchased through Christie's auction house in London for £371,000. This Apple I is uniquely built into the bottom half of a briefcase and the lot included a modified cassette interface card, Panasonic RQ-309DS cassette tape recorder, SWTPC PR-40 alphanumeric printer, Sanyo VM4209 monitor and Motorola M6800 microprocessor. On March 12, 2020, a fully-functional Apple I was purchased at a Boston auction for $458,711. The lot included the original board with a Synertek CPU, Apple Cassette Interface, display case, keyboard kit, power supply, monitor and manuals. On November 9, 2021, one sold with user manuals and Apple software on two cassette tapes for $500,000 (many wrote 400,000 and forgot the premium), originally purchased by a college professor then sold to his student for $650. Serial numbers Both Steve Jobs and Steve Wozniak have stated that Apple did not assign serial numbers to the Apple l. Several boards have been found with numbered stickers affixed to them, which appear to be inspection stickers from the PCB manufacturer/assembler. A batch of boards is known to have numbers hand-written in black permanent marker on the back; these usually appear as "01-00##". Until January 2022, it was unknown who wrote the serial number on Apple of the 1st batch. As of January 2022, 29 Apple-1s with a serial number are known. The highest known number is . Neither the Apple company founders, nor Paul Terrell (founder of the Byte Shop), nor various Byte Shop employees remembered the originator. These numbers are sometimes incorrectly referred to as ‘Byte Shop numbers’. That was just a theory, which is now disproved. After several years of research and collecting type specimens, Achim Baqué (the curator of the Apple-1 Registry), had two original Apple-1s subjected to forensic analysis by PSA Los Angeles. The results were conclusive for both Apple-1s. It is the handwriting of Steve Jobs. The story was published on (February 10, 2022) during a Zoom meeting on the occasion of the World Computer Day. The story and ‘Letter of Authenticity’ were published same day. Museums displaying an original Apple 1 Computer United States American Computer & Robotics Museum in Bozeman, Montana Computer History Museum in Mountain View, California Computer Museum of America in Roswell, Georgia Smithsonian Museum of American History in Washington, DC Living Computers: Museum + Labs in Seattle, Washington System Source Computer Museum in Hunt Valley, Maryland Australia Powerhouse Museum in Sydney, New South Wales Germany Heinz Nixdorf MuseumsForum in Paderborn (working condition) Deutsches Museum in Munich (working condition) United Kingdom Science Museum, London in London, United Kingdom South Korea Nexon Computer Museum in Jeju Island, South Korea Switzerland ENTER Computer Museum in Solothurn, Switzerland Clones and replicas Several Apple I clones and replicas have been released in recent years. These are all created by hobbyists and marketed to the hobbyist/collector community. Availability is usually limited to small runs in response to demand. Replica 1: Created by Vince Briel. A software-compatible clone, produced using modern components, released in 2003 at a price of around $150. PE6502: Created by Jason Putnam. A single board computer kit made with all through-hole and current production components. Runs Apple 1 "Integer BASIC", a clone of AppleSoft BASIC (floating point capable), Wozmon and Krusader- all built-in ROM. 32k of RAM, and a Parallax Propeller terminal. Software compatible with the Apple 1. A-One: Created by Frank Achatz, also using modern components. RC6502 Apple I Replica, which uses a modern or period CPU and MC6821 PIA, and usually modern RAM and ROM. The system is modular, with multiple boards plugging into a backplane, but a single-board version (using an Arduino Nano to replace the keyboard and video hardware with a serial interface) is also available. Obtronix Apple I reproduction: Created by Steve Gabaly, using original components or equivalents thereof. Sold through eBay. Mimeo 1: Created by Mike Willegal. A hardware kit designed to replicate a real Apple I as accurately possible. Buyers are expected to assemble the kits themselves. Newton 1: Created by Michael Ng and released in 2012. Similar to the Mimeo 1, but is made using the same materials and same obsolete processing technique commonly used in the 1970s. Over 400 bare boards, kits and assembled boards were sold. There are Newton NTI and non-NTI versions available. Brain Board, a plug-in firmware board for the Apple II that, with the optional "Wozanium Pack" program, can emulate a functional Apple-1. Replica by MDesk. An accurate PCB copy of original Apple 1 was researched in 2012–2014. A few PCBs without components were sold for $26 in 2014. SmartyKit 1 computer

shipping in June of that year. In October 1977, the Apple I was officially discontinued and removed from Apple's price list. As Wozniak was the only person who could answer most customer support questions about the computer, the company offered Apple I owners discounts and trade-ins for Apple IIs to persuade them to return their computers. These recovered boards were then destroyed by Apple, contributing to their rarity today. Overview Wozniak's design originally used a Motorola 6800 processor, which cost $175, but when MOS Technology introduced the much cheaper 6502 microprocessor ($25) he switched. The Apple I CPU ran at 1.022,727 MHz, a fraction (2⁄7) of the NTSC color carrier which simplified video circuitry. Memory used the new 4K bit DRAM chips, and was 4K Bytes, expandable to 8KB on board, or 64KB externally The board was designed to use the next generation of 16K bit memory chips when they became available. An optional $75 plug-in cassette interface card allowed users to store programs on ordinary audio cassette tapes. A BASIC interpreter, originally written by Wozniak, was provided that let users easily write programs and play simple games. An onboard AC power supply was included. The Apple I's built-in computer terminal circuitry was distinctive. All one needed was a keyboard and a television set. The Apple 1 did not come with a case. It was either used as-is or some chose to build custom (mostly wooden) cases. Competing machines such as the Altair 8800 generally were programmed with front-mounted toggle switches and used indicator lights (red LEDs, most commonly) for output, and had to be extended with separate hardware to allow connection to a computer terminal or a teletypewriter machine. This made the Apple I an innovative machine for its day. Collectors' item As of February 2022, 62 Apple-1 computers have been confirmed to exist and according to not verified information 20 more a likely exist. 41 1st batch, 39 2nd batch and 2 unknown versions. Most are now in working condition. An Apple I reportedly sold for US$50,000 at auction in 1999. In 2008, the website Vintage Computing and Gaming reported that Apple I owner Rick Conte was looking to sell his unit and was "expecting a price in excess of $15,000 U.S." The site later reported Conte had donated the unit to the Maine Personal Computer Museum in 2009. A unit was sold in September 2009 for $17,480 on eBay. A unit belonging to early Apple Computer engineers Dick and Cliff Huston was sold on March 23, 2010, for $42,766 on eBay. In November 2010, an Apple I sold for £133,250 ($210,000) at Christie's auction house in London. The high price was likely due to the rare documents and packaging offered in the sale in addition to the computer, including the original packaging (with the return label showing Steve Jobs' parents' address, the original Apple Computer Inc "headquarters" being their garage), a personally typed and signed letter from Jobs (answering technical questions about the computer), and the original invoice showing "Steven" as the salesman. The computer was brought to Polytechnic University of Turin where it was fixed and used to run the BASIC programming language. On June 15, 2012, a working Apple I was sold at auction by Sotheby's for a then-record $374,500, more than double the expected price. This unit is on display at the Nexon Computer Museum in Jeju City, South Korea. In October 2012, a non-working Apple I from the estate of former Apple Computer employee Joe Copson was put up for auction by Christie's, but found no bidder who was willing to pay the starting price of US$80,000 (£50,000). Copson's board had previously been listed on eBay in December 2011, with a starting bid of $170,000 and failed to sell. Following the Christie's auction, the board was restored to working condition by computer historian Corey Cohen. Copson's Apple I was once again listed on eBay, where it sold for US$236,100.03 on April 23, 2015. On November 24, 2012, a working Apple I was sold at auction by Auction Team Breker for €400,000 (US$515,000). On May 25, 2013, a functioning 1976 model was sold for a then-record €516,000 (US$668,000) in Cologne. Auction Team Breker said "an unnamed Asian client" bought the Apple I. This particular unit has Wozniak's signature. An old business transaction letter from Jobs also was included, as well as the original owner's manual. On June 24, 2013, an Apple I was listed by Christie's as part of a special online-only auction lot called "First Bytes: Iconic Technology From the Twentieth Century." Bidding ran through July 9, 2013. The unit sold for $390,000. In November 2013, a working unit speculated to have been part of the original lot of 50 boards delivered to the Byte Shop was listed by Auction Team Breker for €180,000 ($242,820), but failed to sell during the auction. Immediately following the close of bidding, a private collector purchased it for €246,000 ($330,000). This board was marked "01-0046," matching the numbering placed on other units sold to the Byte Shop and included the original operation manuals, software cassettes, and shipping box autographed by Steve Wozniak. The board also bears Wozniak's signature. In October 2014, a working, early Apple I was sold at auction for $905,000 to the Henry Ford Museum in Dearborn, Michigan. The sale included the keyboard, monitor, cassette decks and a manual. The auction was run by Bonhams. On December 13, 2014, a fully functioning, early Apple I was sold at auction for $365,000 by auction house Christie's. The sale included a keyboard, custom case, original manual and a check labeled "Purchased July 1976 from Steve Jobs in his parents' garage in Los Altos". On May 30, 2015, a woman reportedly dropped off boxes of electronics for disposal at an electronics recycling center in the Silicon Valley of Northern California. Included in the items removed from her garage after the death of her husband was an original Apple I computer, which the recycling firm sold for $200,000 to a private collector. It is the company's practice to give back 50% of the proceeds to the original owner when an item is sold, so they want to find the mystery donor. On September 21, 2015, an Apple I bearing the Byte Shop number 01-0059 was listed by Bonhams Auctions as part of their "History of Science and Technology" auction with a starting bid of US$300,000. The machine was described as, "in near perfect condition." The owner, Tom Romkey, "...only used the Apple-1 once or twice, and ...set it on a shelf, and did not touch it again." The machine did not sell. However, Glenn and Shannon Dellimore, the co-founders of GLAMGLOW, a beauty company which they sold to Estee Lauder Companies, bought it after the auction through Bonhams Auction house. On the 40th Anniversary of Apple Computers 2016 the Dellimore's working Apple-1 went on loan and on display in 'Artifact' at the V&A Museum in London, England. On August 26, 2016, (the 40th Anniversary year of Apple Computers), the rarest Apple-1 in existence, an Apple-I prototype made and hand-built by Steve Jobs himself (according to Apple-1 expert Corey Cohen) and dubbed the 'Holy Grail' of computers was sold for $815,000 to winning bidders Glenn and Shannon Dellimore, the co-founders of cosmetics firm Glamglow, in an auction by Charitybuzz. The for-profit internet company that raises funds for nonprofit organizations declared that ten percent of the proceeds will go to the Leukemia and Lymphoma Society, based in New York. On April 15, 2017, an Apple I removed from Steve Jobs's office by Apple

well-preserved skull and skeleton, with a preserved braincase. The specimen was found in Cactus Park Quarry in western Colorado. Almost all modern paleontologists agreed with Riggs that the two dinosaurs should be classified together in a single genus. According to the rules of the ICZN (which governs the scientific names of animals), the name Apatosaurus, having been published first, has priority as the official name; Brontosaurus was considered a junior synonym and was therefore long discarded from formal use. Despite this, at least one paleontologistRobert T. Bakkerargued in the 1990s that A.ajax and A.excelsus were in fact sufficiently distinct for the latter to merit a separate genus. In 2015, Emanuel Tschopp, Octávio Mateus, and Roger Benson released a paper on diplodocoid systematics, and proposed that genera could be diagnosed by thirteen differing characters, and species separated based on six. The minimum number for generic separation was chosen based on the fact that A.ajax and A.louisae differ in twelve characters, and Diplodocus carnegiei and D.hallorum differ in eleven characters. Thus, thirteen characters were chosen to validate the separation of genera. The six differing features for specific separation were chosen by counting the number of differing features in separate specimens generally agreed to represent one species, with only one differing character in D.carnegiei and A.louisae, but five differing features in B.excelsus. Therefore, Tschopp etal. argued that Apatosaurus excelsus, originally classified as Brontosaurus excelsus, had enough morphological differences from other species of Apatosaurus that it warranted being reclassified as a separate genus again. The conclusion was based on a comparison of 477 morphological characteristics across 81 different dinosaur individuals. Among the many notable differences are the widerand presumably strongerneck of Apatosaurus species compared to B.excelsus. Other species previously assigned to Apatosaurus, such as Elosaurus parvus and Eobrontosaurus yahnahpin were also reclassified as Brontosaurus. Some features proposed to separate Brontosaurus from Apatosaurus include: posterior dorsal vertebrae with the centrum longer than wide; the scapula rear to the acromial edge and the distal blade being excavated; the acromial edge of the distal scapular blade bearing a rounded expansion; and the ratio of the proximodistal length to transverse breadth of the astragalus 0.55 or greater. Sauropod expert Michael D'Emic pointed out that the criteria chosen were to an extent arbitrary and that they would require abandoning the name Brontosaurus again if newer analyses obtained different results. Mammal paleontologist Donald Prothero criticized the mass media reaction to this study as superficial and premature, concluding that he would keep "Brontosaurus" in quotes and not treat the name as a valid genus. Valid species Many species of Apatosaurus have been designated from scant material. Marsh named as many species as he could, which resulted in many being based upon fragmentary and indistinguishable remains. In 2005, Paul Upchurch and colleagues published a study that analyzed the species and specimen relationships of Apatosaurus. They found that A.louisae was the most basal species, followed by FMNHP25112, and then a polytomy of A.ajax, A.parvus, and A.excelsus. Their analysis was revised and expanded with many additional diplodocid specimens in 2015, which resolved the relationships of Apatosaurus slightly differently, and also supported separating Brontosaurus from Apatosaurus. Apatosaurus ajax was named by Marsh in 1877 after Ajax, a hero from Greek mythology. Marsh designated the incomplete, juvenile skeleton YPM1860 as its holotype. The species is less studied than Brontosaurus and A.louisae, especially because of the incomplete nature of the holotype. In 2005, many specimens in addition to the holotype were found assignable to A.ajax, YPM1840, NSMT-PV 20375, YPM1861, and AMNH460. The specimens date from the late Kimmeridgian to the early Tithonian ages. In 2015, only the A.ajax holotype YPM1860 assigned to the species, with AMNH460 found either to be within Brontosaurus, or potentially its own taxon. However, YPM1861 and NSMT-PV 20375 only differed in a few characteristics, and cannot be distinguished specifically or generically from A.ajax. YPM1861 is the holotype of "Atlantosaurus" immanis, which means it might be a junior synonym of A.ajax. Apatosaurus louisae was named by Holland in 1916, being first known from a partial skeleton that was found in Utah. The holotype is CM3018, with referred specimens including CM3378, CM11162, and LACM52844. The former two consist of a vertebral column; the latter two consist of a skull and a nearly complete skeleton, respectively. Apatosaurus louisae specimens all come from the late Kimmeridgian of Dinosaur National Monument. In 2015, Tschopp etal. found the type specimen of Apatosaurus laticollis to nest closely with CM3018, meaning the former is likely a junior synonym of A.louisae. The cladogram below is the result of an analysis by Tschopp, Mateus, and Benson (2015). The authors analyzed most diplodocid type specimens separately to deduce which specimen belonged to which species and genus. Reassigned species Apatosaurus grandis was named in 1877 by Marsh in the article that described A.ajax. It was briefly described, figured, and diagnosed. Marsh later mentioned it was only provisionally assigned to Apatosaurus when he reassigned it to his new genus Morosaurus in 1878. Since Morosaurus has been considered a synonym of Camarasaurus, C.grandis is the oldest-named species of the latter genus. Apatosaurus excelsus was the original type species of Brontosaurus, first named by Marsh in 1879. Elmer Riggs reclassified Brontosaurus as a synonym of Apatosaurus in 1903, transferring the species B.excelsus to A.excelsus. In 2015, Tschopp, Mateus, and Benson argued that the species was distinct enough to be placed in its own genus, so they reclassified it back into Brontosaurus. Apatosaurus parvus, first described from a juvenile specimen as Elosaurus in 1902 by Peterson and Gilmore, was reassigned to Apatosaurus in 1994, and then to Brontosaurus in 2015. Many other, more mature specimens were assigned to it following the 2015 study. Apatosaurus minimus was originally described as a specimen of Brontosaurus sp. in 1904 by Osborn. In 1917, Henry Mook named it as its own species, A.minimus, for a pair of ilia and their sacrum. In 2012, Mike P. Taylor and Matt J. Wedel published a short abstract describing the material of A. minimus, finding it hard to place among either Diplodocoidea or Macronaria. While it was placed with Saltasaurus in a phylogenetic analysis, it was thought to represent instead some form with convergent features from many groups. The study of Tschopp etal. did find that a camarasaurid position for the taxon was supported, but noted that the position of the taxon was found to be highly variable and there was no clearly more likely position. Apatosaurus alenquerensis was named in 1957 by Albert-Félix de Lapparent and Georges Zbyweski. It was based on post cranial material from Portugal. In 1990, this material was reassigned to Camarasaurus, but in 1998 it was given its own genus, Lourinhasaurus. This was further supported by the findings of Tschopp etal. in 2015, where Lourinhasaurus was found to be sister to Camarasaurus and other camarasaurids. Apatosaurus yahnahpin was named by James Filla and Patrick Redman in 1994. Bakker made A.yahnahpin the type species of a new genus, Eobrontosaurus in 1998, and Tschopp reclassified it as Brontosaurus yahnahpin in 2015. Classification Apatosaurus is a member of the family Diplodocidae, a clade of gigantic sauropod dinosaurs. The family includes some of the longest creatures ever to walk the earth, including Diplodocus, Supersaurus, and Barosaurus. Apatosaurus is sometimes classified in the subfamily Apatosaurinae, which may also include Suuwassea, Supersaurus, and Brontosaurus. Othniel Charles Marsh described Apatosaurus as allied to Atlantosaurus within the now-defunct group Atlantosauridae. In 1878, Marsh raised his family to the rank of suborder, including Apatosaurus, Atlantosaurus, Morosaurus (=Camarasaurus) and Diplodocus. He classified this group within Sauropoda, a group he erected in the same study. In 1903, Elmer S. Riggs said the name Sauropoda would be a junior synonym of earlier names; he grouped Apatosaurus within Opisthocoelia. Sauropoda is still used as the group name. In 2011, John Whitlock published a study that placed Apatosaurus a more basal diplodocid, sometimes less basal than Supersaurus. Cladogram of the Diplodocidae after Tschopp, Mateus, and Benson (2015). Paleobiology It was believed throughout the 19th and early 20th centuries that sauropods like Apatosaurus were too massive to support their own weight on dry land. It was theorized that they lived partly submerged in water, perhaps in swamps. More recent findings do not support this; sauropods are now thought to have been fully terrestrial animals. A study of diplodocid snouts showed that the square snout, large proportion of pits, and fine, subparallel scratches of the teeth of Apatosaurus suggests it was a ground-height, nonselective browser. It may have eaten ferns, cycadeoids, seed ferns, horsetails, and algae. Stevens and Parish (2005) speculate that these sauropods fed from riverbanks on submerged water plants. A 2015 study of the necks of Apatosaurus and Brontosaurus found many differences between them and other diplodocids, and that these variations may have shown that the necks of Apatosaurus and Brontosaurus were used for intraspecific combat. Various uses for the single claw on the forelimb of sauropods have been proposed. One suggestion is that they were used for defense, but their shape and size make this unlikely. It was also possible they were for feeding, but the most probable use for the claw was grasping objects such as tree trunks when rearing. Trackways of sauropods like Apatosaurus show that they may have had a range of around per day, and that they could potentially have reached a top speed of per hour. The slow locomotion of sauropods may be due to their minimal muscling, or to recoil after strides. A trackway of a juvenile has led some to believe that they were capable of bipedalism, though this is disputed. Neck posture Diplodocids like Apatosaurus are often portrayed with their necks held high up in the air, allowing them to browse on tall trees. Some studies state diplodocid necks were less flexible than previously believed, because the structure of the neck vertebrae would not have allowed the neck to bend far upward, and that sauropods like Apatosaurus were adapted to low browsing or ground feeding. Other studies by Taylor find that all tetrapods appear to hold their necks at the maximum possible vertical extension when in a normal, alert posture; they argue the same would hold true for sauropods barring any unknown, unique characteristics that set the soft tissue anatomy of their necks apart from that of other animals. Apatosaurus, like Diplodocus, would have held its neck angled upward with the head pointing downward in a resting posture. Kent Stevens and Michael Parrish (1999 and 2005) state Apatosaurus had a great feeding range; its neck could bend into a U-shape laterally. The neck's range of movement would have also allowed the head to feed at the level of the feet. Matthew Cobley et al. (2013) dispute this, finding that large muscles and cartilage would have limited movement of the neck. They state the feeding ranges for sauropods like Diplodocus were smaller than previously believed, and the animals may have had to move their whole bodies around to better access areas where they could browse vegetation. As such, they might have spent more time foraging to meet their minimum energy needs. The conclusions of Cobley etal. are disputed by Taylor, who analyzed the amount and positioning of intervertebral cartilage to determine the flexibility of the neck of Apatosaurus and Diplodocus. He found that the neck of Apatosaurus was very flexible. Physiology Given the large body mass and long neck of sauropods like Apatosaurus, physiologists have encountered problems determining how these animals breathed. Beginning with the assumption that, like crocodilians, Apatosaurus did not have a diaphragm, the dead-space volume (the amount of unused air remaining in the mouth, trachea, and air tubes after each breath) has been estimated at about for a specimen. Paladino calculates its tidal volume (the amount of air moved in or out during a single breath) at with an avian respiratory system, if mammalian, and if reptilian. On this basis, its respiratory system would likely have been parabronchi, with multiple pulmonary air sacs as in avian lungs, and a flow-through lung. An avian respiratory system would need a lung volume of about compared with a mammalian requirement of , which would exceed the space available. The overall thoracic volume of Apatosaurus has been estimated at , allowing for a , four-chambered heart and a lung capacity. That would allow about for the necessary tissue. Evidence for the avian system in Apatosaurus and other sauropods is also present in the pneumaticity of the vertebrae. Though this plays a role in reducing the weight of the animal, Wedel (2003) states they are also likely connected to air sacs, as in birds. James Spotila et al. (1991) concludes that the large body size of sauropods would have made them unable to maintain high metabolic rates because they would not have been able to release enough heat. They assumed sauropods had a reptilian respiratory system. Wedel says that an avian system would have allowed it to dump more heat. Some scientists state that the heart would have had trouble sustaining sufficient blood pressure to oxygenate the brain. Others suggest that the near-horizontal posture of the head and neck would have eliminated the problem of supplying blood to the brain because it would not have been elevated. James Farlow (1987) calculates that an Apatosaurus-sized dinosaur about would have possessed of fermentation contents. Assuming Apatosaurus had an avian respiratory system and a reptilian resting-metabolism, Frank Paladino etal. (1997) estimate the animal would have needed to consume only about of water per day. Growth A 1999 microscopic study of Apatosaurus and Brontosaurus bones concluded the animals grew rapidly when young and reached near-adult sizes in about 10years. In 2008, a study on the growth rates of sauropods was published by Thomas Lehman and Holly Woodward. They said that by using growth lines and length-to-mass ratios, Apatosaurus would have grown to 25t (25 long tons; 28 short tons) in 15years, with growth peaking at in a single year. An alternative method, using limb length and body mass, found Apatosaurus grew per year, and reached its full mass before it was about 70years old. These estimates have been called unreliable because the calculation methods are not sound; old growth lines would have been obliterated by bone remodelling. One of the first identified growth factors of Apatosaurus was the number of sacral vertebrae, which increased to five by the time of the creature's maturity. This was first noted in 1903 and again in 1936. Long-bone histology enables researchers to estimate the age that a specific individual reached. A study by Eva Griebeler etal. (2013) examined long-bone histological data and concluded the Apatosaurus sp.SMA0014 weighed , reached sexual maturity at 21years, and died aged 28. The same growth model indicated Apatosaurus sp.BYU 601–17328 weighed , reached sexual maturity at 19years, and died aged 31. Juveniles Compared with most sauropods, a relatively large amount of juvenile material is known from Apatosaurus. Multiple specimens in the OMNH are from juveniles of an undetermined species of Apatosaurus; this material includes partial shoulder and pelvic girdles, some vertebrae, and limb bones. OMNH juvenile material is from at least two different age groups and based on overlapping bones likely comes

a Camarasaurus skull cast. Apatosaurus skeletons were mounted with speculative skull casts until 1970, when McIntosh showed that more robust skulls assigned to Diplodocus were more likely from Apatosaurus. Apatosaurus is a genus in the family Diplodocidae. It is one of the more basal genera, with only Amphicoelias and possibly a new, unnamed genus more primitive. Although the subfamily Apatosaurinae was named in 1929, the group was not used validly until an extensive 2015 study. Only Brontosaurus is also in the subfamily, with the other genera being considered synonyms or reclassified as diplodocines. Brontosaurus has long been considered a junior synonym of Apatosaurus; its type species was reclassified as A.excelsus in 1903. A 2015 study concluded that Brontosaurus is a valid genus of sauropod distinct from Apatosaurus, but not all paleontologists agree with this division. As it existed in North America during the late Jurassic, Apatosaurus would have lived alongside dinosaurs such as Allosaurus, Camarasaurus, Diplodocus, and Stegosaurus. Description Apatosaurus was a large, long-necked, quadrupedal animal with a long, whip-like tail. Its forelimbs were slightly shorter than its hindlimbs. Most size estimates are based on specimen CM3018, the type specimen of A.louisae. In 1936, this was measured to be , by measuring the vertebral column. Current estimates are similar, finding that the individual was long and had a mass of . A 2015 study that estimated the mass of volumetric models of Dreadnoughtus, Apatosaurus, and Giraffatitan estimates CM3018 at , similar in mass to Dreadnoughtus. Past estimates have put the creature's mass as high as . Some specimens of A.ajax (such as OMNH1670) represent individuals 1130% longer, suggesting masses twice that of CM3018 or , potentially rivaling the largest titanosaurs. The skull is small in relation to the size of the animal. The jaws are lined with spatulate (chisel-like) teeth suited to an herbivorous diet. The snout of Apatosaurus and similar diplodocoids is squared, with only Nigersaurus having a squarer skull. The braincase of Apatosaurus is well preserved in specimen BYU17096, which also preserved much of the skeleton. A phylogenetic analysis found that the braincase had a morphology similar to those of other diplodocoids. Some skulls of Apatosaurus have been found still in articulation with their teeth. Those teeth that have the enamel surface exposed do not show any scratches on the surface; instead, they display a sugary texture and little wear. Like those of other sauropods, the neck vertebrae are deeply bifurcated; they carried neural spines with a large trough in the middle, resulting in a wide, deep neck. The vertebral formula for the holotype of A.louisae is 15cervicals, 10dorsals, 5sacrals, and 82caudals. The caudal vertebra number may vary, even within species. The cervical vertebrae of Apatosaurus and Brontosaurus are stouter and more robust than those of other diplodocids and were found to be most similar to Camarasaurus by Charles Whitney Gilmore. In addition, they support cervical ribs that extend farther towards the ground than in diplodocines, and have vertebrae and ribs that are narrower towards the top of the neck, making the neck nearly triangular in cross-section. In Apatosaurus louisae, the atlas-axis complex of the first cervicals is nearly fused. The dorsal ribs are not fused or tightly attached to their vertebrae and are instead loosely articulated. Apatosaurus has ten dorsal ribs on either side of the body. The large neck was filled with an extensive system of weight-saving air sacs. Apatosaurus, like its close relative Supersaurus, has tall neural spines, which make up more than half the height of the individual bones of its vertebrae. The shape of the tail is unusual for a diplodocid; it is comparatively slender because of the rapidly decreasing height of the vertebral spines with increasing distance from the hips. Apatosaurus also had very long ribs compared to most other diplodocids, giving it an unusually deep chest. As in other diplodocids, the tail transformed into a whip-like structure towards the end. The limb bones are also very robust. Within Apatosaurinae, the scapula of Apatosaurus louisae is intermediate in morphology between those of A.ajax and Brontosaurus excelsus. The arm bones are stout, so the humerus of Apatosaurus resembles that of Camarasaurus, as well as Brontosaurus. However, the humeri of Brontosaurus and A.ajax are more similar to each other than they are to A.louisae. In 1936, Charles Gilmore noted that previous reconstructions of Apatosaurus forelimbs erroneously proposed that the radius and ulna could cross; in life they would have remained parallel. Apatosaurus had a single large claw on each forelimb, a feature shared by all sauropods more derived than Shunosaurus. The first three toes had claws on each hindlimb. The phalangeal formula is 2-1-1-1-1, meaning the innermost finger (phalanx) on the forelimb has two bones and the next has one. The single manual claw bone (ungual) is slightly curved and squarely truncated on the anterior end. The pelvic girdle includes the robust ilia, and the fused (co-ossified) pubes and ischia. The femora of Apatosaurus are very stout and represent some of the most robust femora of any member of Sauropoda. The tibia and fibula bones are different from the slender bones of Diplodocus but are nearly indistinguishable from those of Camarasaurus. The fibula is longer and slenderer than the tibia. The foot of Apatosaurus has three claws on the innermost digits; the digit formula is 3-4-5-3-2. The first metatarsal is the stoutest, a feature shared among diplodocids. Discovery and species The first Apatosaurus bones were discovered by Edward Drinker Cope and the name Apatosaurus ajax was coined in 1877 by Cope's rival Othniel Charles Marsh, Professor of Paleontology at Yale University, based on a nearly complete skeleton (holotype, YPM1860) discovered in the eastern foothills of the Rocky Mountains in Gunnison County, Colorado. The composite term Apatosaurus comes from the Greek words ()/ () meaning "deception"/"deceptive", and () meaning "lizard"; thus, "deceptive lizard". Marsh gave it this name based on the chevron bones, which are dissimilar to those of other dinosaurs; instead, the chevron bones of Apatosaurus showed similarities with those of mosasaurs, most likely that of the representative species Mosasaurus. During excavation and transportation, the bones of the holotype skeleton were mixed with those of another Apatosaurus individual originally described as Atlantosaurus immanis; as a consequence, some elements cannot be ascribed to either specimen with confidence. Marsh distinguished the new genus Apatosaurus from Atlantosaurus on the basis of the number of sacral vertebrae, with Apatosaurus possessing three and Atlantosaurus four. Two years later, Marsh announced the discovery of a larger and more complete specimen at Como Bluff, Wyoming. He gave this specimen a new name based on the conventions of his age and the relatively sparse fossil record available at that time. It was later recognised that the features he had used to distinguish genera and species were in fact more widespread among sauropods. He named the new species Brontosaurus excelsus. All specimens currently considered Apatosaurus were from the Morrison Formation, the location of the excavations of Marsh and Cope. Another specimen, in the American Museum of Natural History under specimen number460, which is occasionally assigned to Apatosaurus, is considered nearly complete; only the head, feet, and sections of the tail are missing, and it was the first sauropod skeleton mounted. The specimen was found north of Medicine Bow, Wyoming, in 1898 by Walter Granger, and took the entire summer to extract. To complete the mount, sauropod feet that were discovered at the same quarry and a tail fashioned to appear as Marsh believed it shouldbut which had too few vertebraewere added. In addition, a sculpted model of what the museum thought the skull of this massive creature might look like was made. This was not a delicate skull like that of Diplodocuswhich was later found to be more accuratebut was based on "the biggest, thickest, strongest skull bones, lower jaws and tooth crowns from three different quarries". These skulls were likely those of Camarasaurus, the only other sauropod for which good skull material was known at the time. The mount construction was overseen by Adam Hermann, who failed to find Apatosaurus skulls. Hermann was forced to sculpt a stand-in skull by hand. Osborn said in a publication that the skull was "largely conjectural and based on that of Morosaurus" (now Camarasaurus). In 1903, Elmer Riggs published a study that described a well-preserved skeleton of a diplodocid from the Grand River Valley near Fruita, Colorado, Field Museum of Natural History specimen P25112. Riggs thought that the deposits were similar in age to those of the Como Bluff in Wyoming from which Marsh had described Brontosaurus. Most of the skeleton was found, and after comparison with both Brontosaurus and Apatosaurus ajax, Riggs realized that the holotype of A.ajax was immature, and thus the features distinguishing the genera were not valid. Since Apatosaurus was the earlier name, Brontosaurus should be considered a junior synonym of Apatosaurus. Because of this, Riggs recombined Brontosaurus excelsus as Apatosaurus excelsus. Based on comparisons with other species proposed to belong to Apatosaurus, Riggs also determined that the Field Columbian Museum specimen was likely most similar to A.excelsus. Despite Riggs' publication, Henry Fairfield Osborn, who was a strong opponent of Marsh and his taxa, labeled the Apatosaurus mount of the American Museum of Natural History Brontosaurus. Because of this decision the name Brontosaurus was commonly used outside of scientific literature for what Riggs considered Apatosaurus, and the museum's popularity meant that Brontosaurus became one of the best known dinosaurs, even though it was invalid throughout nearly all of the 20th and early 21st centuries. It was not until 1909 that an Apatosaurus skull was found during the first expedition, led by Earl Douglass, to what would become known as the Carnegie Quarry at Dinosaur National Monument. The skull was found a short distance from a skeleton (specimen CM3018) identified as the new species Apatosaurus louisae, named after Louise Carnegie, wife of Andrew Carnegie, who funded field research to find complete dinosaur skeletons in the American West. The skull was designated CM11162; it was very similar to the skull of Diplodocus. Another smaller skeleton of A.louisae was found nearby CM11162 and CM3018. The skull was accepted as belonging to the Apatosaurus specimen by Douglass and Carnegie Museum director William H. Holland, although other scientistsmost notably Osbornrejected this identification. Holland defended his view in 1914 in an address to the Paleontological Society of America, yet he left the Carnegie Museum mount headless. While some thought Holland was attempting to avoid conflict with Osborn, others suspected Holland was waiting until an articulated skull and neck were found to confirm the association of the skull and skeleton. After Holland's death in 1934, museum staff placed a cast of a Camarasaurus skull on the mount. While most other museums were using cast or sculpted Camarasaurus skulls on Apatosaurus mounts, the Yale Peabody Museum decided to sculpt a skull based on the lower jaw of a Camarasaurus, with the cranium based on Marsh's 1891 illustration of the skull. The skull also included forward-pointing nasalssomething unusual for any dinosaurand fenestrae differing from both the drawing and other skulls. No Apatosaurus skull was mentioned in literature until

'allosaur' specimens), new discoveries in Portugal, and several very complete new specimens have also contributed to the growing knowledge base. "Big Al" and "Big Al II" In 1991, "Big Al" (MOR 693), a 95% complete, partially articulated specimen of Allosaurus was discovered. It measured about 8 meters (about 26 ft) in length. MOR 693 was excavated near Shell, Wyoming, by a joint Museum of the Rockies and University of Wyoming Geological Museum team. This skeleton was discovered by a Swiss team, led by Kirby Siber. Chure and Loewen in 2020 identified the individual as a representative of the species Allosaurus jimmadseni. In 1996, the same team discovered a second Allosaurus, "Big Al II". This specimen, the best preserved skeleton of its kind to date, is also referred to Allosaurus jimmadseni. The completeness, preservation, and scientific importance of this skeleton gave "Big Al" its name; the individual itself was below the average size for Allosaurus fragilis, and was a subadult estimated at only 87% grown. The specimen was described by Breithaupt in 1996. Nineteen of its bones were broken or showed signs of infection, which may have contributed to "Big Al's" death. Pathologic bones included five ribs, five vertebrae, and four bones of the feet; several damaged bones showed osteomyelitis, a bone infection. A particular problem for the living animal was infection and trauma to the right foot that probably affected movement and may have also predisposed the other foot to injury because of a change in gait. Al had an infection on the first phalanx on the third toe that was afflicted by an involucrum. The infection was long-lived, perhaps up to six months. Big Al Two is also known to have multiple injuries. Species Six species of Allosaurus have been named: A. amplus, A. atrox, A. europaeus, the type species A. fragilis, A. jimmadseni and A. lucasi. Among these, Daniel Chure and Mark Loewen in 2020 only recognized the species A. fragilis, A. europaeus, and the newly-named A. jimmadseni as being valid species. A. fragilis is the type species and was named by Marsh in 1877. It is known from the remains of at least 60 individuals, all found in the Kimmeridgian–Tithonian Upper Jurassic-age Morrison Formation of the United States, spread across the states of Colorado, Montana, New Mexico, Oklahoma, South Dakota, Utah, and Wyoming. Details of the humerus (upper arm) of A. fragilis have been used as diagnostic among Morrison theropods, but A. jimmadseni indicates that this is no longer the case at the species level. A. jimmadseni has been scientifically described based on two nearly complete skeletons. The first specimen to wear the identification was unearthed in Dinosaur National Monument in northeastern Utah, with the original "Big Al" individual subsequently recognized as belonging to the same species. This species differs from A. fragilis in several anatomical details, including a jugal or cheekbone with a straight lower margin. Fossils are confined to the Salt Wash Member of the Morrison Formation, with A. fragilis only found in the higher Brushy Basin Member. A. fragilis, A. jimmadseni, A. amplus, and A. lucasi are all known from remains discovered in the Kimmeridgian–Tithonian Upper Jurassic-age Morrison Formation of the United States, spread across the states of Colorado, Montana, New Mexico, Oklahoma, South Dakota, Utah and Wyoming. A. fragilis is regarded as the most common, known from the remains of at least 60 individuals. For a while in the late 1980s and early 1990s, it was common to recognize A. fragilis as the short-snouted species, with the long-snouted taxon being A. atrox; however, subsequent analysis of specimens from the Cleveland-Lloyd Dinosaur Quarry, Como Bluff, and Dry Mesa Quarry showed that the differences seen in the Morrison Formation material could be attributed to individual variation. A study of skull elements from the Cleveland-Lloyd site found wide variation between individuals, calling into question previous species-level distinctions based on such features as the shape of the lacrimal horns, and the proposed differentiation of A. jimmadseni based on the shape of the jugal. A. europaeus was found in the Kimmeridgian-age Porto Novo Member of the Lourinhã Formation, but may be the same as A. fragilis. Allosaurus material from Portugal was first reported in 1999 on the basis of MHNUL/AND.001, a partial skeleton including a quadrate, vertebrae, ribs, gastralia, chevrons, part of the hips, and hindlimbs. This specimen was assigned to A. fragilis, but the subsequent discovery of a partial skull and neck (ML 415) near Lourinhã, in the Kimmeridgian-age Porto Novo Member of the Lourinhã Formation, spurred the naming of the new species A. europaeus by Octávio Mateus and colleagues. The species appeared earlier in the Jurassic than A. fragilis and differs from other species of Allosaurus in cranial details. However, more material may show it to be A. fragilis, as originally described. The issue of species and potential synonyms is complicated by the type specimen of Allosaurus fragilis (catalog number YPM 1930) being extremely fragmentary, consisting of a few incomplete vertebrae, limb bone fragments, rib fragments, and a tooth. Because of this, several scientists have interpreted the type specimen as potentially dubious, and thus the genus Allosaurus itself or at least the species A. fragilis would be a nomen dubium ("dubious name", based on a specimen too incomplete to compare to other specimens or to classify). To address this situation, Gregory S. Paul and Kenneth Carpenter (2010) submitted a petition to the ICZN to have the name "A. fragilis" officially transferred to the more complete specimen USNM4734 (as a neotype). Synonyms Creosaurus, Epanterias, and Labrosaurus are regarded as junior synonyms of Allosaurus. Most of the species that are regarded as synonyms of A. fragilis, or that were misassigned to the genus, are obscure and were based on scrappy remains. One exception is Labrosaurus ferox, named in 1884 by Marsh for an oddly formed partial lower jaw, with a prominent gap in the tooth row at the tip of the jaw, and a rear section greatly expanded and turned down. Later researchers suggested that the bone was pathologic, showing an injury to the living animal, and that part of the unusual form of the rear of the bone was due to plaster reconstruction. It is now regarded as an example of A. fragilis. In his 1988 book, Predatory Dinosaurs of the World, the freelance dinosaurologist Gregory Paul proposed that A. fragilis had tall pointed horns and a slender build compared to a postulated second species A. atrox, and was not a different sex due to rarity. Allosaurus atrox was originally named by Marsh in 1878 as the type species of its own genus, Creosaurus, and is based on YPM 1890, an assortment of bones including a couple of pieces of the skull, portions of nine tail vertebrae, two hip vertebrae, an ilium, and ankle and foot bones. Although the idea of two common Morrison allosaur species was followed in some semi-technical and popular works, the 2000 thesis on Allosauridae noted that Charles Gilmore mistakenly reconstructed USNM 4734 as having a shorter skull than the specimens referred by Paul to atrox, refuting supposed differences between USNM 4734 and putative A. atrox specimens like DINO 2560, AMNH 600, and AMNH 666. "Allosaurus agilis", seen in Zittel, 1887, and Osborn, 1912, is a typographical error for A. fragilis. "Allosaurus ferox" is a typographical error by Marsh for A. fragilis in a figure caption for the partial skull YPM 1893, and YPM 1893 has been treated as a specimen of A fragilis. Likewise, "Labrosaurus fragilis" is a typographical error by Marsh (1896) for Labrosaurus ferox. "A. whitei" is a nomen nudum coined by Pickering in 1996 for the complete Allosaurus specimens that Paul referred to A. atrox. "Madsenius" was coined by David Lambert in 1990, for remains from Dinosaur National Monument assigned to Allosaurus or Creosaurus (a synonym of Allosaurus), and was to be described by paleontologist Bob Bakker as "Madsenius trux". However, "Madsenius" is now seen as yet another synonym of Allosaurus because Bakker's action was predicated upon the false assumption of USNM 4734 being distinct from long-snouted Allosaurus due to errors in Gilmore's (1920) reconstruction of USNM 4734. "Wyomingraptor" was informally coined by Bakker for allosaurid remains from the Morrison Formation of the Late Jurassic. The remains unearthed are labeled as Allosaurus and are housed in the Tate Geological Museum. However, there has been no official description of the remains and "Wyomingraptor" has been dismissed as a nomen nudum, with the remains referable to Allosaurus. Formerly assigned species and fossils Several species initially classified within or referred to Allosaurus do not belong within the genus. A. medius was named by Marsh in 1888 for various specimens from the Early Cretaceous Arundel Formation of Maryland, although most of the remains were removed by Richard Swann Lull to the new ornithopod species Dryosaurus grandis, except for a tooth. Gilmore considered the tooth nondiagnostic but transferred it to Dryptosaurus, as D. medius. The referral was not accepted in the most recent review of basal tetanurans, and Allosaurus medius was simply listed as a dubious species of theropod. It may be closely related to Acrocanthosaurus. Allosaurus valens is a new combination for Antrodemus valens used by Friedrich von Huene in 1932; Antrodemus valens itself may also pertain to Allosaurus fragilis, as Gilmore suggested in 1920. A. lucaris, another Marsh name, was given to a partial skeleton in 1878. He later decided it warranted its own genus, Labrosaurus, but this has not been accepted, and A. lucaris is also regarded as another specimen of A. fragilis. Allosaurus lucaris, is known mostly from vertebrae, sharing characters with Allosaurus. Paul and Carpenter stated that the type specimen of this species, YPM 1931, was from a younger age than Allosaurus, and might represent a different genus. However, they found that the specimen was undiagnostic, and thus A. lucaris was a nomen dubium. Allosaurus sibiricus was described in 1914 by A. N. Riabinin on the basis of a bone, later identified as a partial fourth metatarsal, from the Early Cretaceous of Buryatia, Russia. It was transferred to Chilantaisaurus in 1990, but is now considered a nomen dubium indeterminate beyond Theropoda. Allosaurus meriani was a new combination by George Olshevsky for Megalosaurus meriani Greppin, 1870, based on a tooth from the Late Jurassic of Switzerland. However, a recent overview of Ceratosaurus included it in Ceratosaurus sp. Apatodon mirus, based on a scrap of vertebra Marsh first thought to be a mammalian jaw, has been listed as a synonym of Allosaurus fragilis. However, it was considered indeterminate beyond Dinosauria by Chure, and Mickey Mortimer believes that the synonymy of Apatodon with Allosaurus was due to correspondence to Ralph Molnar by John McIntosh, whereby the latter reportedly found a paper saying that Othniel Charles Marsh admitted that the Apatodon holotype was actually an allosaurid dorsal vertebra. A. amplexus was named by Gregory S. Paul for giant Morrison allosaur remains, and included in his conception Saurophagus maximus (later Saurophaganax). A. amplexus was originally coined by Cope in 1878 as the type species of his new genus Epanterias, and is based on what is now AMNH 5767, parts of three vertebrae, a coracoid, and a metatarsal. Following Paul's work, this species has been accepted as a synonym of A. fragilis. A 2010 study by Paul and Kenneth Carpenter, however, indicates that Epanterias is temporally younger than the A. fragilis type specimen, so it is a separate species at minimum. A. maximus was a new combination by David K. Smith for Chure's Saurophaganax maximus, a taxon created by Chure in 1995 for giant allosaurid remains from the Morrison of Oklahoma. These remains had been known as Saurophagus, but that name was already in use, leading Chure to propose a substitute. Smith, in his 1998 analysis of variation, concluded that S. maximus was not different enough from Allosaurus to be a separate genus, but did warrant its own species, A. maximus. This reassignment was rejected in a review of basal tetanurans. There are also several species left over from the synonymizations of Creosaurus and Labrosaurus with Allosaurus. Creosaurus potens was named by Lull in 1911 for a vertebra from the Early Cretaceous of Maryland. It is now regarded as a dubious theropod. Labrosaurus stechowi, described in 1920 by Janensch based on isolated Ceratosaurus-like teeth from the Tendaguru beds of Tanzania, was listed by Donald F. Glut as a species of Allosaurus, is now considered a dubious ceratosaurian related to Ceratosaurus. L. sulcatus, named by Marsh in 1896 for a Morrison theropod tooth, which like L. stechowi is now regarded as a dubious Ceratosaurus-like ceratosaur. A. tendagurensis was named in 1925 by Werner Janensch for a partial shin (MB.R.3620) found in the Kimmeridgian-age Tendaguru Formation in Mtwara, Tanzania. Although tabulated as a tentatively valid species of Allosaurus in the second edition of the Dinosauria, subsequent studies place it as indeterminate beyond Tetanurae, either a carcharodontosaurian or megalosaurid. Although obscure, it was a large theropod, possibly around 10 meters long (33 ft) and 2.5 metric tons (2.8 short tons) in weight. Kurzanov and colleagues in 2003 designated six teeth from Siberia as Allosaurus sp. (meaning the authors found the specimens to be most like those of Allosaurus, but did not or could not assign a species to them). They were reclassified as an indeterminate theropod. Also, reports of Allosaurus in Shanxi, China go back to at least 1982. These were interpreted as Torvosaurus remains in 2012. An astragalus (ankle bone) thought to belong to a species of Allosaurus was found at Cape Paterson, Victoria in Early Cretaceous beds in southeastern Australia. It was thought to provide evidence that Australia was a refugium for animals that had gone extinct elsewhere. This identification was challenged by Samuel Welles, who thought it more resembled that of an ornithomimid, but the original authors defended their identification. With fifteen years of new specimens and research to look at, Daniel Chure reexamined the bone and found that it was not Allosaurus, but could represent an allosauroid. Similarly, Yoichi Azuma and Phil Currie, in their description of Fukuiraptor, noted that the bone closely resembled that of their new genus. This specimen is sometimes referred to as "Allosaurus robustus", an informal museum name. It may have belonged to something similar to, or the same as, Australovenator, or it may represent an abelisaur. Classification Allosaurus was an allosaurid, a member of a family of large theropods within the larger group Carnosauria. The family name Allosauridae was created for this genus in 1878 by Othniel Charles Marsh, but the term was largely unused until the 1970s in favor of Megalosauridae, another family of large theropods that eventually became a wastebasket taxon. This, along with the use of Antrodemus for Allosaurus during the same period, is a point that needs to be remembered when searching for information on Allosaurus in publications that predate James Madsen's 1976 monograph. Major publications using the name "Megalosauridae" instead of "Allosauridae" include Gilmore, 1920, von Huene, 1926, Romer, 1956 and 1966, Steel, 1970, and Walker, 1964. Following the publication of Madsen's influential monograph, Allosauridae became the preferred family assignment, but it too was not strongly defined. Semi-technical works used Allosauridae for a variety of large theropods, usually those that were larger and better-known than megalosaurids. Typical theropods that were thought to be related to Allosaurus included Indosaurus, Piatnitzkysaurus, Piveteausaurus, Yangchuanosaurus, Acrocanthosaurus, Chilantaisaurus, Compsosuchus, Stokesosaurus, and Szechuanosaurus. Given modern knowledge of theropod diversity and the advent of cladistic study of evolutionary relationships, none of these theropods is now recognized as an allosaurid, although several, like Acrocanthosaurus and Yangchuanosaurus, are members of closely related families. Below is a cladogram based on the analysis of Benson et al. in 2010. Allosauridae is one of four families in Carnosauria; the other three are Neovenatoridae, Carcharodontosauridae and Sinraptoridae. Allosauridae has at times been proposed as ancestral to the Tyrannosauridae (which would make it paraphyletic), one example being Gregory S. Paul's Predatory Dinosaurs of the World, but this has been rejected, with tyrannosaurids identified as members of a separate branch of theropods, the Coelurosauria. Allosauridae is the smallest of the carnosaur families, with only Saurophaganax and a currently unnamed French allosauroid accepted as possible valid genera besides Allosaurus in the most recent review. Another genus, Epanterias, is a potential valid member, but it and Saurophaganax may turn out to be large examples of Allosaurus. Recent reviews have kept the genus Saurophaganax and included Epanterias with Allosaurus. Paleobiology Life history The wealth of Allosaurus fossils, from nearly all ages of individuals, allows scientists to study how the animal grew and how long its lifespan may have been. Remains may reach as far back in the lifespan as eggs—crushed eggs from Colorado have been suggested as those of Allosaurus. Based on histological analysis of limb bones, bone deposition appears to stop at around 22 to 28 years, which is comparable to that of other large theropods like Tyrannosaurus. From the same analysis, its maximum growth appears to have been at age 15, with an estimated growth rate of about 150 kilograms (330 lb) per year. Medullary bone tissue (endosteally derived, ephemeral, mineralization located inside the medulla of the long bones in gravid female birds) has been reported in at least one Allosaurus specimen, a shin bone from the Cleveland-Lloyd Quarry. Today, this bone tissue is only formed in female birds that are laying eggs, as it is used to supply calcium to shells. Its presence in the Allosaurus individual has been used to establish sex and show it had reached reproductive age. However, other studies have called into question some cases of medullary bone in dinosaurs, including this Allosaurus individual. Data from extant birds suggested that the medullary bone in this Allosaurus individual may have been the result of a bone pathology instead. However, with the confirmation of medullary tissue indicating sex in a specimen of Tyrannosaurus, it may be possible to ascertain whether or not the Allosaurus in question was indeed female. The discovery of a juvenile specimen with a nearly complete hindlimb shows that the legs were relatively longer in juveniles, and the lower segments of the leg (shin and foot) were relatively longer than the thigh. These differences suggest that younger Allosaurus were faster and had different hunting strategies than adults, perhaps chasing small prey as juveniles, then becoming ambush hunters of large prey upon adulthood. The thigh bone became thicker and wider during growth, and the cross-section less circular, as muscle attachments shifted, muscles became shorter, and the growth of the leg slowed. These changes imply that juvenile legs has less predictable stresses compared with adults, which would have moved with more regular forward progression. Conversely, the skull bones appear to have generally grown isometrically, increasing in size without changing in proportion. Feeding Many paleontologists accept Allosaurus as an active predator of large animals. There is dramatic evidence for allosaur attacks on Stegosaurus, including an Allosaurus tail vertebra with a partially healed puncture wound that fits a Stegosaurus tail spike, and a Stegosaurus neck plate with a U-shaped wound that correlates well with an Allosaurus snout. Sauropods seem to be likely candidates as both live prey and as objects of scavenging, based on the presence of scrapings on sauropod bones fitting allosaur teeth well and the presence of shed allosaur teeth with sauropod bones. However, as Gregory Paul noted in 1988, Allosaurus was probably not a predator of fully grown sauropods, unless it hunted in packs, as it had a modestly sized skull and relatively small teeth, and was greatly outweighed by contemporaneous sauropods. Another possibility is that it preferred to hunt juveniles instead of fully grown adults. Research in the 1990s and the first decade of the 21st century may have found other solutions to this question. Robert T. Bakker, comparing Allosaurus to Cenozoic saber-toothed carnivorous mammals, found similar adaptations, such as a reduction of jaw muscles and increase in neck muscles, and the ability to open the jaws extremely wide. Although Allosaurus did not have saber teeth, Bakker suggested another mode of attack that would have used such neck and jaw adaptations: the short teeth in effect became small serrations on a saw-like cutting edge running the length of the upper jaw, which would have been driven into prey. This type of jaw would permit slashing attacks against much larger prey, with the goal of weakening the victim. Similar conclusions were drawn by another study using finite element analysis on an Allosaurus skull. According to their biomechanical analysis, the skull was very strong but had a relatively small bite force. By using jaw muscles only, it could produce a bite force of 805 to 8,724 N, but the skull could withstand nearly 55,500 N of vertical force against the tooth row. The authors suggested that Allosaurus used its skull like a machete against prey, attacking open-mouthed, slashing flesh with its teeth, and tearing it away without splintering bones, unlike Tyrannosaurus, which is thought to have been capable of damaging bones. They also suggested that the architecture of the skull could have permitted the use of different strategies against different prey; the skull was light enough to allow attacks on smaller and more agile ornithopods, but strong enough for high-impact ambush attacks against larger prey like stegosaurids and sauropods. Their interpretations were challenged by other researchers, who found no modern analogues to a hatchet attack and considered it more likely that the skull was strong to compensate for its open construction when absorbing the stresses from struggling prey. The original authors noted that Allosaurus itself has no modern equivalent, that the tooth row is well-suited to such an attack, and that articulations in the skull cited by their detractors as problematic actually helped protect the palate and lessen stress. Another possibility for handling large prey is that theropods like Allosaurus were "flesh grazers" which could take bites of flesh out of living sauropods that were sufficient to sustain the predator so it would not have needed to expend the effort to kill the prey outright. This strategy would also potentially have allowed the prey to recover and be fed upon in a similar way later. An additional suggestion notes that ornithopods were the most common available dinosaurian prey, and that allosaurs may have subdued them by using an attack similar to that of modern big cats: grasping the prey with their forelimbs, and then making multiple bites on the throat to crush the trachea. This is compatible with other evidence that the forelimbs were strong and capable of restraining prey. Studies done by Stephen Lautenschager et al. from the University of Bristol also indicate Allosaurus could open its jaws quite wide and sustain considerable muscle force. When compared with Tyrannosaurus and the therizinosaurid Erlikosaurus in the same study, it was found that Allosaurus had a wider gape than either; the animal was capable of opening its jaws to a 92-degree angle at maximum. The findings also indicate that large carnivorous dinosaurs, like modern carnivores, had wider jaw gapes than herbivores. A biomechanical study published in 2013 by Eric Snively and colleagues found that Allosaurus had an unusually low attachment point on the skull for the longissimus capitis superficialis neck muscle compared to other theropods such as Tyrannosaurus. This would have allowed the animal to make rapid and forceful vertical movements with the skull. The authors found that vertical strikes as proposed by Bakker and Rayfield are consistent with the animal's capabilities. They also found that the animal probably processed carcasses by vertical movements in a similar manner to falcons, such as kestrels: the animal could have gripped prey with the skull and feet, then pulled back and up to remove flesh. This differs from the prey-handling envisioned for tyrannosaurids, which probably tore flesh with lateral shakes of the skull, similar to crocodilians. In addition, Allosaurus was able to "move its head and neck around relatively rapidly and with considerable control", at the cost of power. Other aspects of feeding include the eyes, arms, and legs. The shape of the skull of Allosaurus limited potential binocular vision to 20° of width, slightly less than that of modern crocodilians. As with crocodilians, this may have been enough to judge prey distance and time attacks. The arms, compared with those of other theropods, were suited for both grasping prey at a distance or clutching it close, and the articulation of the claws suggests that they could have been used to hook things. Finally, the top speed of Allosaurus has been estimated at 30 to 55 kilometers per hour (19 to 34 miles per hour). A paper on the cranio-dental morphology of Allosaurus and how it worked has deemed the hatchet jaw attack unlikely, reinterpreting the unusually wide gape as an adaptation to allow Allosaurus to deliver a muscle-driven bite to large prey, with the weaker jaw muscles being a trade-off to allow for the widened gape. An alternate hypothesis by Pahl and Ruedas in 2021 suggested instead that Allosaurus subsisted primarily on carrion produced by giant sauropods, based on ecological modelling. They proposed that sauropod carcasses were analogous to modern whale falls, in that they may have provided dense energy reservoirs to the entire ecosystem as the animals died naturally of starvation or exhaustion. They also suggested that Allosaurus obtained

belonging to an individual he estimates at long. Each premaxilla (the bones that formed the tip of the snout) held five teeth with D-shaped cross-sections, and each maxilla (the main tooth-bearing bones in the upper jaw) had between 14 and 17 teeth; the number of teeth does not exactly correspond to the size of the bone. Each dentary (the tooth-bearing bone of the lower jaw) had between 14 and 17 teeth, with an average count of 16. The teeth became shorter, narrower, and more curved toward the back of the skull. All of the teeth had saw-like edges. They were shed easily, and were replaced continually, making them common fossils. Its skull was light, robust and equipped with dozens of sharp, serrated teeth. Its skull averaged long but could possibly reach . The skull had a pair of horns above and in front of the eyes. These horns were composed of extensions of the lacrimal bones, and varied in shape and size. There were also lower paired ridges running along the top edges of the nasal bones that led into the horns. The horns were probably covered in a keratin sheath and may have had a variety of functions, including acting as sunshades for the eyes, being used for display, and being used in combat against other members of the same species (although they were fragile). There was a ridge along the back of the skull roof for muscle attachment, as is also seen in tyrannosaurids. Inside the lacrimal bones were depressions that may have held glands, such as salt glands. Within the maxillae were sinuses that were better developed than those of more basal theropods such as Ceratosaurus and Marshosaurus; they may have been related to the sense of smell, perhaps holding something like Jacobson's organs. The roof of the braincase was thin, perhaps to improve thermoregulation for the brain. The skull and lower jaws had joints that permitted motion within these units. In the lower jaws, the bones of the front and back halves loosely articulated, permitting the jaws to bow outward and increasing the animal's gape. The braincase and frontals may also have had a joint. Postcranial skeleton Allosaurus had nine vertebrae in the neck, 14 in the back, and five in the sacrum supporting the hips. The number of tail vertebrae is unknown and varied with individual size; James Madsen estimated about 50, while Gregory S. Paul considered that to be too many and suggested 45 or less. There were hollow spaces in the neck and anterior back vertebrae. Such spaces, which are also found in modern theropods (that is, the birds), are interpreted as having held air sacs used in respiration. The rib cage was broad, giving it a barrel chest, especially in comparison to less derived theropods like Ceratosaurus. Allosaurus had gastralia (belly ribs), but these are not common findings, and they may have ossified poorly. In one published case, the gastralia show evidence of injury during life. A furcula (wishbone) was also present, but has only been recognized since 1996; in some cases furculae were confused with gastralia. The ilium, the main hip bone, was massive, and the pubic bone had a prominent foot that may have been used for both muscle attachment and as a prop for resting the body on the ground. Madsen noted that in about half of the individuals from the Cleveland-Lloyd Dinosaur Quarry, independent of size, the pubes had not fused to each other at their foot ends. He suggested that this was a sexual characteristic, with females lacking fused bones to make egg-laying easier. This proposal has not attracted further attention, however. The forelimbs of Allosaurus were short in comparison to the hindlimbs (only about 35% the length of the hindlimbs in adults) and had three fingers per hand, tipped with large, strongly curved and pointed claws. The arms were powerful, and the forearm was somewhat shorter than the upper arm (1:1.2 ulna/humerus ratio). The wrist had a version of the semilunate carpal also found in more derived theropods like maniraptorans. Of the three fingers, the innermost (or thumb) was the largest, and diverged from the others. The phalangeal formula is 2-3-4-0-0, meaning that the innermost finger (phalange) has two bones, the next has three, and the third finger has four. The legs were not as long or suited for speed as those of tyrannosaurids, and the claws of the toes were less developed and more hoof-like than those of earlier theropods. Each foot had three weight-bearing toes and an inner dewclaw, which Madsen suggested could have been used for grasping in juveniles. There was also what is interpreted as the splint-like remnant of a fifth (outermost) metatarsal, perhaps used as a lever between the Achilles tendon and foot. Discovery and history Early discoveries and research The discovery and early study of Allosaurus is complicated by the multiplicity of names coined during the Bone Wars of the late 19th century. The first described fossil in this history was a bone obtained secondhand by Ferdinand Vandeveer Hayden in 1869. It came from Middle Park, near Granby, Colorado, probably from Morrison Formation rocks. The locals had identified such bones as "petrified horse hoofs". Hayden sent his specimen to Joseph Leidy, who identified it as half of a tail vertebra, and tentatively assigned it to the European dinosaur genus Poekilopleuron as Poicilopleuron valens. He later decided it deserved its own genus, Antrodemus. Allosaurus itself is based on YPM 1930, a small collection of fragmentary bones including parts of three vertebrae, a rib fragment, a tooth, a toe bone, and, most useful for later discussions, the shaft of the right humerus (upper arm). Othniel Charles Marsh gave these remains the formal name Allosaurus fragilis in 1877. Allosaurus comes from the Greek /, meaning "strange" or "different" and /, meaning "lizard" or "reptile". It was named 'different lizard' because its vertebrae were different from those of other dinosaurs known at the time of its discovery. The species epithet fragilis is Latin for "fragile", referring to lightening features in the vertebrae. The bones were collected from the Morrison Formation of Garden Park, north of Cañon City. Marsh and Edward Drinker Cope, who were in scientific competition with each other, went on to coin several other genera based on similarly sparse material that would later figure in the taxonomy of Allosaurus. These include Marsh's Creosaurus and Labrosaurus, and Cope's Epanterias. In their haste, Cope and Marsh did not always follow up on their discoveries (or, more commonly, those made by their subordinates). For example, after the discovery by Benjamin Mudge of the type specimen of Allosaurus in Colorado, Marsh elected to concentrate work in Wyoming; when work resumed at Garden Park in 1883, M. P. Felch found an almost complete Allosaurus and several partial skeletons. In addition, one of Cope's collectors, H. F. Hubbell, found a specimen in the Como Bluff area of Wyoming in 1879, but apparently did not mention its completeness, and Cope never unpacked it. Upon unpacking in 1903 (several years after Cope had died), it was found to be one of the most complete theropod specimens then known, and in 1908 the skeleton, now cataloged as AMNH 5753, was put on public view. This is the well-known mount poised over a partial Apatosaurus skeleton as if scavenging it, illustrated as such by Charles R. Knight. Although notable as the first free-standing mount of a theropod dinosaur, and often illustrated and photographed, it has never been scientifically described. The multiplicity of early names complicated later research, with the situation compounded by the terse descriptions provided by Marsh and Cope. Even at the time, authors such as Samuel Wendell Williston suggested that too many names had been coined. For example, Williston pointed out in 1901 that Marsh had never been able to adequately distinguish Allosaurus from Creosaurus. The most influential early attempt to sort out the convoluted situation was produced by Charles W. Gilmore in 1920. He came to the conclusion that the tail vertebra named Antrodemus by Leidy was indistinguishable from those of Allosaurus, and Antrodemus thus should be the preferred name because, as the older name, it had priority. Antrodemus became the accepted name for this familiar genus for over 50 years, until James Madsen published on the Cleveland-Lloyd specimens and concluded that Allosaurus should be used because Antrodemus was based on material with poor, if any, diagnostic features and locality information (for example, the geological formation that the single bone of Antrodemus came from is unknown). "Antrodemus" has been used informally for convenience when distinguishing between the skull Gilmore restored and the composite skull restored by Madsen. Cleveland-Lloyd discoveries Although sporadic work at what became known as the Cleveland-Lloyd Dinosaur Quarry in Emery County, Utah, had taken place as early as 1927, and the fossil site itself described by William L. Stokes in 1945, major operations did not begin there until 1960. Under a cooperative effort involving nearly 40 institutions, thousands of bones were recovered between 1960 and 1965. The quarry is notable for the predominance of Allosaurus remains, the condition of the specimens, and the lack of scientific resolution on how it came to be. The majority of bones belong to the large theropod Allosaurus fragilis (it is estimated that the remains of at least 46 A. fragilis have been found there, out of at a minimum 73 dinosaurs), and the fossils found there are disarticulated and well-mixed. Nearly a dozen scientific papers have been written on the taphonomy of the site, suggesting numerous mutually exclusive explanations for how it may have formed. Suggestions have ranged from animals getting stuck in a bog, to becoming trapped in deep mud, to falling victim to drought-induced mortality around a waterhole, to getting trapped in a spring-fed pond or seep. Regardless of the actual cause, the great quantity of well-preserved Allosaurus remains has allowed this genus to be known in detail, making it among the best-known theropods. Skeletal remains from the quarry pertain to individuals of almost all ages and sizes, from less than to long, and the disarticulation is an advantage for describing bones usually found fused. Due to being one of Utah's two fossil quarries where many Allosaurus specimens have been discovered, Allosaurus was designated as the state fossil of Utah in 1988. Recent work: 1980s–present The period since Madsen's monograph has been marked by a great expansion in studies dealing with topics concerning Allosaurus in life (paleobiological and paleoecological topics). Such studies have covered topics including skeletal variation, growth, skull construction, hunting methods, the brain, and the possibility of gregarious living and parental care. Reanalysis of old material (particularly of large 'allosaur' specimens), new discoveries in Portugal, and several very complete new specimens have also contributed to the growing knowledge base. "Big Al" and "Big Al II" In 1991, "Big Al" (MOR 693), a 95% complete, partially articulated specimen of Allosaurus was discovered. It measured about 8 meters (about 26 ft) in length. MOR 693 was excavated near Shell, Wyoming, by a joint Museum of the Rockies and University of Wyoming Geological Museum team. This skeleton was discovered by a Swiss team, led by Kirby Siber. Chure and Loewen in 2020 identified the individual as a representative of the species Allosaurus jimmadseni. In 1996, the same team discovered a second Allosaurus, "Big Al II". This specimen, the best preserved skeleton of its kind to date, is also referred to Allosaurus jimmadseni. The completeness, preservation, and scientific importance of this skeleton gave "Big Al" its name; the individual itself was below the average size for Allosaurus fragilis, and was a subadult estimated at only 87% grown. The specimen was described by Breithaupt in 1996. Nineteen of its bones were broken or showed signs of infection, which may have contributed to "Big Al's" death. Pathologic bones included five ribs, five vertebrae, and four bones of the feet; several damaged bones showed osteomyelitis, a bone infection. A particular problem for the living animal was infection and trauma to the right foot that probably affected movement and may have also predisposed the other foot to injury because of a change in gait. Al had an infection on the first phalanx on the third toe that was afflicted by an involucrum. The infection was long-lived, perhaps up to six months. Big Al Two is also known to have multiple injuries. Species Six species of Allosaurus have been named: A. amplus, A. atrox, A. europaeus, the type species A. fragilis, A. jimmadseni and A. lucasi. Among these, Daniel Chure and Mark Loewen in 2020 only recognized the species A. fragilis, A. europaeus, and the newly-named A. jimmadseni as being valid species. A. fragilis is the type species and was named by Marsh in 1877. It is known from the remains of at least 60 individuals, all found in the Kimmeridgian–Tithonian Upper Jurassic-age Morrison Formation of the United States, spread across the states of Colorado, Montana, New Mexico, Oklahoma, South Dakota, Utah, and Wyoming. Details of the humerus (upper arm) of A. fragilis have been used as diagnostic among Morrison theropods, but A. jimmadseni indicates that this is no longer the case at the species level. A. jimmadseni has been scientifically described based on two nearly complete skeletons. The first specimen to wear the identification was unearthed in Dinosaur National Monument in northeastern Utah, with the original "Big Al" individual subsequently recognized as belonging to the same species. This species differs from A. fragilis in several anatomical details, including a jugal or cheekbone with a straight lower margin. Fossils are confined to the Salt Wash Member of the Morrison Formation, with A. fragilis only found in the higher Brushy Basin Member. A. fragilis, A. jimmadseni, A. amplus, and A. lucasi are all known from remains discovered in the Kimmeridgian–Tithonian Upper Jurassic-age Morrison Formation of the United States, spread across the states of Colorado, Montana, New Mexico, Oklahoma, South Dakota, Utah and Wyoming. A. fragilis is regarded as the most common, known from the remains of at least 60 individuals. For a while in the late 1980s and early 1990s, it was common to recognize A. fragilis as the short-snouted species, with the long-snouted taxon being A. atrox; however, subsequent analysis of specimens from the Cleveland-Lloyd Dinosaur Quarry, Como Bluff, and Dry Mesa Quarry showed that the differences seen in the Morrison Formation material could be attributed to individual variation. A study of skull elements from the Cleveland-Lloyd site found wide variation between individuals, calling into question previous species-level distinctions based on such features as the shape of the lacrimal horns, and the proposed differentiation of A. jimmadseni based on the shape of the jugal. A. europaeus was found in the Kimmeridgian-age Porto Novo Member of the Lourinhã Formation, but may be the same as A. fragilis. Allosaurus material from Portugal was first reported in 1999 on the basis of MHNUL/AND.001, a partial skeleton including a quadrate, vertebrae, ribs, gastralia, chevrons, part of the hips, and hindlimbs. This specimen was assigned to A. fragilis, but the subsequent discovery of a partial skull and neck (ML 415) near Lourinhã, in the Kimmeridgian-age Porto Novo Member of the Lourinhã Formation, spurred the naming of the new species A. europaeus by Octávio Mateus and colleagues. The species appeared earlier in the Jurassic than A. fragilis and differs from other species of Allosaurus in cranial details. However, more material may show it to be A. fragilis, as originally described. The issue of species and potential synonyms is complicated by the type specimen of Allosaurus fragilis (catalog number YPM 1930) being extremely fragmentary, consisting of a few incomplete vertebrae, limb bone fragments, rib fragments, and a tooth. Because of this, several scientists have interpreted the type specimen as potentially dubious, and thus the genus Allosaurus itself or at least the species A. fragilis would be a nomen dubium ("dubious name", based on a specimen too incomplete to compare to other specimens or to classify). To address this situation, Gregory S. Paul and Kenneth Carpenter (2010) submitted a petition to the ICZN to have the name "A. fragilis" officially transferred to the more complete specimen USNM4734 (as a neotype). Synonyms Creosaurus, Epanterias, and Labrosaurus are regarded as junior synonyms of Allosaurus. Most of the species that are regarded as synonyms of A. fragilis, or that were misassigned to the genus, are obscure and were based on scrappy remains. One exception is Labrosaurus ferox, named in 1884 by Marsh for an oddly formed partial lower jaw,

variants owe their global popularity to their reliability under harsh conditions, low production cost (compared to contemporary weapons), availability in virtually every geographic region, and ease of use. The AK has been manufactured in many countries, and has seen service with armed forces as well as irregular forces and insurgencies throughout the world. , "of the estimated 500 million firearms worldwide, approximately 100 million belong to the Kalashnikov family, three-quarters of which are AK-47s". The model is the basis for the development of many other types of individual, crew-served and specialised firearms. History Origins During World War II, the Sturmgewehr 44 rifle used by German forces made a deep impression on their Soviet counterparts. The select-fire rifle was chambered for a new intermediate cartridge, the 7.92×33mm Kurz, and combined the firepower of a submachine gun with the range and accuracy of a rifle. On 15 July 1943, an earlier model of the Sturmgewehr was demonstrated before the People's Commissariat of Arms of the USSR. The Soviets were impressed with the weapon and immediately set about developing an intermediate caliber fully automatic rifle of their own, to replace the PPSh-41 submachine guns and outdated Mosin–Nagant bolt-action rifles that armed most of the Soviet Army. The Soviets soon developed the 7.62×39mm M43 cartridge, which is used in the semi-automatic SKS carbine and the RPD light machine gun. Shortly after World War II, the Soviets developed the AK-47 rifle, which quickly replaced the SKS in Soviet service. Introduced in 1959, the AKM is a lighter stamped steel version and the most ubiquitous variant of the entire AK series of firearms. In the 1960s, the Soviets introduced the RPK light machine gun, an AK type weapon with a stronger receiver, a longer heavy barrel, and a bipod, that eventually replaced the RPD light machine gun. Concept Mikhail Kalashnikov began his career as a weapon designer in 1941 while recuperating from a shoulder wound which he received during the Battle of Bryansk. Kalashnikov himself stated..."I was in the hospital, and a soldier in the bed beside me asked: 'Why do our soldiers have only one rifle for two or three of our men, when the Germans have automatics?' So I designed one. I was a soldier, and I created a machine gun for a soldier. It was called an Avtomat Kalashnikova, the automatic weapon of Kalashnikov—AK—and it carried the year of its first manufacture, 1947." The AK-47 is best described as a hybrid of previous rifle technology innovations. "Kalashnikov decided to design an automatic rifle combining the best features of the American M1 and the German StG 44." Kalashnikov's team had access to these weapons and had no need to "reinvent the wheel". Kalashnikov himself observed: "A lot of Russian Army soldiers ask me how one can become a constructor, and how new weaponry is designed. These are very difficult questions. Each designer seems to have his own paths, his own successes and failures. But one thing is clear: before attempting to create something new, it is vital to have a good appreciation of everything that already exists in this field. I myself have had many experiences confirming this to be so." There are claims about Kalashnikov copying other designs, like Bulkin's TKB-415 or Simonov's AVS-31. Early designs Kalashnikov started work on a submachine gun design in 1942 and with a light machine gun design in 1943. Early in 1944, Kalashnikov was given some 7.62×39mm M43 cartridges and was informed that there were other designers working on weapons for this new Soviet small-arms cartridge. It was suggested that a new weapon might well lead to greater things. He then undertook work on the new rifle. In 1944, he entered a design competition with this new 7.62×39mm, semi-automatic, gas-operated, long stroke piston carbine, strongly influenced by the American M1 Garand. This new rifle was in the same class as the SKS-45 carbine, with a fixed magazine and a gas tube above the barrel. However, the new Kalashnikov design lost out to a Simonov design. In 1946, a new design competition was initiated to develop a new rifle. Kalashnikov submitted an entry. It was gas-operated rifle with a short-stroke gas piston above the barrel, a breech-block mechanism similar to his 1944 carbine, and a curved 30-round magazine. Kalashnikov's rifles AK-1 (with a milled receiver) and AK-2 (with a stamped receiver) proved to be reliable weapons and were accepted to a second round of competition along with other designs. These prototypes (also known as the AK-46) had a rotary bolt, a two-part receiver with separate trigger unit housing, dual controls (separate safety and fire selector switches) and a non-reciprocating charging handle located on the left side of the weapon. This design had many similarities to the StG 44. In late 1946, as the rifles were being tested, one of Kalashnikov's assistants, Aleksandr Zaitsev, suggested a major redesign to improve reliability. At first, Kalashnikov was reluctant, given that their rifle had already fared better than its competitors. Eventually, however, Zaitsev managed to persuade Kalashnikov. In November 1947, the new prototypes (AK-47s) were completed. It used a long-stroke gas piston above the barrel. The upper and lower receivers were combined into a single receiver. The selector and safety were combined into a single control-lever/dust-cover on the right side of the rifle. And, the bolt-handle was simply attached to the bolt-carrier. This simplified the design and production of the rifle. The first army trial series began in early 1948. The new rifle proved to be reliable under a wide range of conditions with convenient handling characteristics. In 1949, it was adopted by the Soviet Army as "7.62 mm Kalashnikov rifle (AK)". Further development There were many difficulties during the initial phase of production. The first production models had stamped sheet metal receivers with a milled trunnion and butt stock insert, and a stamped body. Difficulties were encountered in welding the guide and ejector rails, causing high rejection rates. Instead of halting production, a heavy machined receiver was substituted for the sheet metal receiver. Even though production of these milled rifles started in 1951, they were officially referred to as AK-49, based on the date their development started, but they are much widely known in the collectors' and current commercial market as "Type 2 AK-47". This was a more costly process, but the use of machined receivers accelerated production as tooling and labor for the earlier Mosin–Nagant rifle's machined receiver were easily adapted. Partly because of these problems, the Soviets were not able to distribute large numbers of the new rifle to soldiers until 1956. During this time, production of the interim SKS rifle continued. Once the manufacturing difficulties of non-milled receivers had been overcome, a redesigned version designated the AKM (M for "modernized" or "upgraded"; in Russian: Автомат Калашникова Модернизированный [Avtomat Kalashnikova Modernizirovanniy]) was introduced in 1959. This new model used a stamped sheet metal receiver and featured a slanted muzzle brake on the end of the barrel to compensate for muzzle rise under recoil. In addition, a hammer retarder was added to prevent the weapon from firing out of battery (without the bolt being fully closed), during rapid or fully automatic fire. This is also sometimes referred to as a "cyclic rate reducer", or simply "rate reducer", as it also has the effect of reducing the number of rounds fired per minute during fully automatic fire. It was also roughly one-third lighter than the previous model. Both licensed and unlicensed production of the Kalashnikov weapons abroad were almost exclusively of the AKM variant, partially due to the much easier production of the stamped receiver. This model is the most commonly encountered, having been produced in much greater quantities. All rifles based on the Kalashnikov design are frequently referred to as AK-47s in the West, although this is only correct when applied to rifles based on the original three receiver types. In most former Eastern Bloc countries, the weapon is known simply as the "Kalashnikov" or "AK". The differences between the milled and stamped receivers includes the use of rivets rather than welds on the stamped receiver, as well as the placement of a small dimple above the magazine well for stabilization of the magazine. Replacement In 1974, the Soviets began replacing their AK-47 and AKM rifles with a newer design, the AK-74, which uses 5.45×39mm ammunition. This new rifle and cartridge had only started to be manufactured in Eastern European nations when the Soviet Union collapsed, drastically slowing production of the AK-74 and other weapons of the former Soviet bloc. Design The AK-47 was designed to be a simple, reliable fully automatic rifle that could be manufactured quickly and cheaply, using mass production methods that were state of the art in the Soviet Union during the late 1940s. The AK-47 uses a long stroke gas system that is generally associated with great reliability in adverse conditions. The large gas piston, generous clearances between moving parts, and tapered cartridge case design allow the gun to endure large amounts of foreign matter and fouling without failing to cycle. Cartridge The AK fires the 7.62×39mm cartridge with a muzzle velocity of . The cartridge weight is , the projectile weight is . The original Soviet M43 bullets are 123 grain boat-tail bullets with a copper-plated steel jacket, a large steel core, and some lead between the core and the jacket. The AK has excellent penetration when shooting through heavy foliage, walls or a common vehicle's metal body and into an opponent attempting to use these things as cover. The 7.62×39mm M43 projectile does not generally fragment when striking an opponent and has an unusual tendency to remain intact even after making contact with bone. The 7.62×39mm round produces significant wounding in cases where the bullet tumbles (yaws) in tissue, but produces relatively minor wounds in cases where the bullet exits before beginning to yaw. In the absence of yaw, the M43 round can pencil through tissue with relatively little injury. Most, if not all, of the 7.62×39mm ammunition found today is of the upgraded M67 variety. This variety deleted the steel insert, shifting the center of gravity rearward, and allowing the projectile to destabilize (or yaw) at about , nearly earlier in tissue than the M43 round. This change also reduces penetration in ballistic gelatin to ~ for the newer M67 round versus ~ for the older M43 round. However, the wounding potential of M67 is mostly limited to the small permanent wound channel the bullet itself makes, especially when the bullet yaws. Operating mechanism To fire, the operator inserts a loaded magazine, pulls back and releases the charging handle, and then pulls the trigger. In semi-automatic, the firearm fires only once, requiring the trigger to be released and depressed again for the next shot. In fully automatic, the rifle continues to fire automatically cycling fresh rounds into the chamber until the magazine is exhausted or pressure is released from the trigger. After ignition of the cartridge primer and propellant, rapidly expanding propellant gases are diverted into the gas cylinder above the barrel through a vent near the muzzle. The build-up of gases inside the gas cylinder drives the long-stroke piston and bolt carrier rearward and a cam guide machined into the underside of the bolt carrier, along with an ejector spur on the bolt carrier rail guide, rotates the bolt approximately 35° and unlocks it from the barrel extension via a camming pin on the bolt. The moving assembly has about of free travel, which creates a delay between the initial recoil impulse of the piston and the bolt unlocking sequence, allowing gas pressures to drop to a safe level before the seal between the chamber and the bolt is broken. The AK-47 does not have a gas valve; excess gases are ventilated through a series of radial ports in the gas cylinder. The Kalashnikov operating system offers no primary extraction upon bolt rotation, but uses an extractor claw to eject the spent cartridge case. Barrel The rifle received a barrel with a chrome-lined bore and four right-hand grooves at a 240 mm (1 in 9.45 in) or 31.5 calibers rifling twist rate. The gas block contains a gas channel that is installed at a slanted angle in relation to the bore axis. The muzzle is threaded for the installation of various muzzle devices such as a muzzle brake or a blank-firing adaptor. Gas block The gas block of the AK-47 features a cleaning rod capture or sling loop. Gas relief ports that alleviate gas pressure are placed horizontally in a row on the gas cylinder. Fire selector The fire selector is a large lever located on the right side of the rifle, it acts as a dust-cover and prevents the charging handle from being pulled fully to the rear when it is on safe. It is operated by the shooter's right fore-fingers and has 3 settings: safe (up), full-auto (center), and semi-auto (down). The reason for this is that under stress a soldier will push the selector lever down with considerable force bypassing the full-auto stage and setting the rifle to semi-auto. To set the AK-47 to full-auto requires the deliberate action of centering the selector lever. To operate the fire selector lever, right handed shooters have to briefly remove their right hand from the pistol grip, which is ergonomically sub-optimal. Some AK-type rifles also have a more traditional selector lever on the left side of the receiver just above the pistol grip. This lever is operated by the shooter's right thumb and has three settings: safe (forward), full-auto (center), and semi-auto (backward). Sights The AK-47 uses a notched rear tangent iron sight calibrated in increments from . The front sight is a post adjustable for elevation in the field. Horizontal adjustment requires a special drift tool and is done by the armory before issue or if the need arises by an armorer after issue. The sight line elements are approximately over the bore axis. The "point-blank range" battle zero setting "П" standing for постоянная (constant) on the 7.62×39mm AK-47 rear tangent sight element corresponds to a zero. These settings mirror the Mosin–Nagant and SKS rifles, which the AK-47 replaced. For the AK-47 combined with service cartridges, the 300 m battle zero setting limits the apparent "bullet rise" within approximately relative to the line of sight. Soldiers are instructed to fire at any target within this range by simply placing the sights on the center of mass (the belt buckle, according to Russian and former Soviet doctrine) of the enemy target. Any errors in range estimation are tactically irrelevant, as a well-aimed shot will hit the torso of the enemy soldier. Some AK-type rifles have a front sight with a flip-up luminous dot that is calibrated at , for improved night fighting. Furniture The AK-47 was originally equipped with a buttstock, handguard and an upper heat guard made from solid wood. With the introduction of the Type 3 receiver the buttstock, lower handguard and upper heatguard were manufactured from birch plywood laminates. Such engineered woods are stronger and resist warping better than the conventional one-piece patterns, do not require lengthy maturing, and are cheaper. The wooden furniture was finished with the Russian amber shellac finishing process. AKS and AKMS models featured a downward-folding metal butt-stock similar to that of the German MP40 submachine-gun, for use in the restricted space in the BMP infantry combat vehicle, as well as by paratroops. All 100 series AKs use plastic furniture with side-folding stocks. Magazines The standard magazine capacity is 30 rounds. There are also 10, 20, and 40-round box magazines, as well as 75-round drum magazines. The AK-47's standard 30-round magazines have a pronounced curve that allows them to smoothly feed ammunition into the chamber. Their heavy steel construction combined with "feed-lips" (the surfaces at the top of the magazine that control the angle at which the cartridge enters the chamber) machined from a single steel billet makes them highly resistant to damage. These magazines are so strong that "Soldiers have been known to use their mags as hammers, and even bottle openers". This contributes to the AK-47 magazine being more reliable, but makes it heavier than U.S. and NATO magazines. The early slab-sided steel AK-47 30-round detachable box magazines had sheet-metal bodies and weighed empty. The later steel AKM 30-round magazines had lighter sheet-metal bodies with prominent reinforcing ribs weighing empty. To further reduce weight, a lightweight magazine with an aluminum body with a prominent reinforcing waffle rib pattern weighing empty was developed for the AKM that proved to be too fragile and the small issued amount of these magazines was quickly withdrawn from service. As a replacement steel-reinforced 30-round plastic 7.62×39mm box magazines were introduced. These rust-colored magazines weigh empty and are often mistakenly identified as being made of Bakelite (a phenolic resin), but were actually fabricated from two-parts of AG-S4 molding compound (a glass-reinforced phenol-formaldehyde binder impregnated composite), assembled using an epoxy resin adhesive. Noted for their durability, these magazines did

of optical accessories without interfering with the zeroing of the optic. However, the 100 series side folding stocks cannot be folded with the optics mounted. Characteristics Service life The AK-47 and its variants have been and are made in dozens of countries, with "quality ranging from finely engineered weapons to pieces of questionable workmanship." As a result, the AK-47 has a service/system life of approximately 6,000, to 10,000, to 15,000 rounds. The AK-47 was designed to be a cheap, simple, easy to manufacture rifle, perfectly matching Soviet military doctrine that treats equipment and weapons as disposable items. As units are often deployed without adequate logistical support and dependent on "battlefield cannibalization" for resupply, it is actually more cost-effective to replace rather than repair weapons. The AK-47 has small parts and springs that need to be replaced every few thousand rounds. However, "Every time it is disassembled beyond the field stripping stage, it will take some time for some parts to regain their fit, some parts may tend to shake loose and fall out when firing the weapon. Some parts of the AK-47 line are riveted together. Repairing these can be quite a hassle, since the end of the rivet has to be ground off and a new one set after the part is replaced." Variants Early variants (7.62×39mm) Issue of 1948/49: Type 1: The very earliest models, stamped sheet metal receiver, are now very rare. Issue of 1951: Type 2: Has a milled receiver. Barrel and chamber are chrome plated to resist corrosion. Issue of 1954/55: Type 3: Lightened, milled receiver variant. Rifle weight is . AKS (AKS-47): Type 1, 2, or 3 receiver: Featured a downward-folding metal stock similar to that of the MP 40 produced in Nazi Germany, for use in the restricted space in the BMP infantry combat vehicle, as well as by paratroops. AKN (AKSN): Night scope rail. Modernized (7.62×39mm) AKM: A simplified, lighter version of the AK-47; Type 4 receiver is made from stamped and riveted sheet metal. A slanted muzzle device was added to counter climb in automatic fire. Rifle weight is due to the lighter receiver. This is the most ubiquitous variant of the AK-47. AKMS: Under-folding stock version of the AKM intended for airborne troops. AKMN (AKMSN): Night scope rail. AKML (AKMSL): Slotted flash suppressor and night scope rail. RPK: Hand-held machine gun version with longer barrel and bipod. The variants—RPKS, RPKN (RPKSN), RPKL (RPKSL)—mirror AKM variants. The "S" variants have a side-folding wooden stock. Foreign Variants (7.62×39mm) Type 56: Chinese assault rifle based on AK-47 (specifically Type 3) and AKM rifles. Still in production primarily for export markets. For the further developed AK models, see Kalashnikov rifles. Production Manufacturing countries of AK-47 and its variants in alphabetical order. A private company Kalashnikov Concern (formerly Izhmash) from Russia has repeatedly claimed that the majority of foreign manufacturers are producing AK-type rifles without proper licensing. Accuracy potential Western method The AK-47's accuracy has always been considered to be "good enough" to hit an adult male torso out to about , though even experts firing from prone or bench rest positions at this range were observed to have difficulty placing ten consecutive rounds on target. Later designs did not significantly improve its accuracy. An AK can fire a 10-shot group of at , and at The newer stamped-steel receiver AKM models, while more rugged and less prone to metal fatigue, are actually less accurate than the forged/milled receivers of their predecessors: the milled AK-47s are capable of shooting groups at , whereas the stamped AKMs are capable of shooting groups at . The best shooters are able to hit a man-sized target at within five shots (firing from prone or bench rest position) or ten shots (standing). The single-shot hit-probability on the NATO E-type Silhouette Target (a human upper body half and head silhouette) of the AK-47 and the later developed AK-74, M16A1 and M16A2 rifles were measured by the US military under ideal proving ground conditions in the 1980s as follows: Under worst field exercise circumstances, the hit probabilities for all the tested rifles were drastically reduced, 34% at 50m down to 3–4% at 600m with no significant differences between weapons at each range. Russian method The following table represents the Russian method for determining accuracy, which is far more complex than Western methods. In the West, one fires a group of shots into the target and then simply measures the overall diameter of the group. The Russians, on the other hand, fire a group of shots into the target. They then draw two circles on the target, one for the maximum vertical dispersion of hits and one for the maximum horizontal dispersion of hits. They then disregard the hits on the outer part of the target and only count half of the hits (50% or R50) on the inner part of the circles. This dramatically reduces the overall diameter of the groups. They then use both the vertical and horizontal measurements of the reduced groups to measure accuracy. This circular error probable method used by the Russians and other European militaries cannot be converted and is not comparable to US military methods for determining rifle accuracy. When the R50 results are doubled the hit probability increases to 93.7%. R50 means the closest 50 percent of the shot group will all be within a circle of the mentioned diameter. The vertical and horizontal mean (R50) deviations with service ammunition at for AK platforms are. Users : Type 56 variant. : EKAM: The counter-terrorist unit of the Hellenic Police. : Type 58 variant. – Locally made as well as being in service with the Army : Replaced by the AKM in 1959 and the AK-74 in 1974. Used by Thahan Phran Former users : MPi-K (AK-47) and MPi-KM (AKM). : Replaced by the AKM and AK-74. : Captured from PAVN and Vietcong Illicit trade Throughout the world, the AK and its variants are commonly used by governments, revolutionaries, terrorists, criminals, and civilians alike. In some countries, such as Somalia, Rwanda, Mozambique, Congo and Tanzania, the prices for Black Market AKs are between $30 and $125 per weapon and prices have fallen in the last few decades due to mass counterfeiting. In Kenya, "an AK-47 fetches five head of cattle (about 10,000 Kenya shillings or 100 U.S. dollars) when offered for barter, but costs almost half that price when cash is paid". There are places around the world where AK type weapons can be purchased on the black market "for as little as $6, or traded for a chicken or a sack of grain". The AK-47 has also spawned a cottage industry of sorts and has been copied and manufactured (one gun at a time) in small shops around the world (see Khyber Pass Copy). The estimated numbers of AK-type weapons vary greatly. The Small Arms Survey suggest that "between 70 and 100 million of these weapons have been produced since 1947". The World Bank estimates that out of the 500 million total firearms available worldwide, 100 million are of the Kalashnikov family, and 75 million are AK-47s. Because AK-type weapons have been made in many countries, often illicitly, it is impossible to know how many really exist. Conflicts The AK-47 has been used in the following conflicts: 1950s Hungarian Revolution (1956) Vietnam War (1955–1975) Laotian Civil War (1959–1975) 1960s Congo Crisis (1960–1965) Portuguese Colonial War (1961–1974) Rhodesian Bush War (1964–1979) The Troubles (late 1960s–1998) Communist insurgency in Thailand (1965–1983) South African Border War (1966–1990) India-China clashes (1967) Cambodian Civil War (1968–1975) Communist insurgency in Malaysia (1968–1989) 1970s Yom Kippur War (1973) Ethiopian Civil War (1974–1991) Western Sahara War (1975–1991) Cambodian–Vietnamese War (1978–1989) Chadian–Libyan conflict (1978–1987) Soviet–Afghan War (1979–1989) 1980s Iran–Iraq War (1980–1988) Sri Lankan Civil War (1983–2009) United States invasion of Grenada (1983) Lord's Resistance Army insurgency (1987–present) 1990s Tuareg rebellion (1990–1995) Gulf War (1990–1991) Somali Civil War (1991–present) Yugoslav Wars (1991–2001) Burundian Civil War (1993–2005) Congo Civil War (1997–1999) Kargil War (1999) 2000s War in Afghanistan (2001–2021) Iraq War (2003–2011) South Thailand insurgency (2004–present) Mexican Drug War (2006–present) 2010s Libyan Civil War (2011) Syrian Civil War (2011–present) Iraqi insurgency (2011–2013) Central African Republic Civil War (2012–present) Russo-Ukrainian war 2020s 2020 Nagorno-Karabakh war Cultural influence and impact During the Cold War, the Soviet Union and the People's Republic of China, as well as United States and other NATO nations supplied arms and technical knowledge to numerous countries and rebel forces around the world. During this time the Western countries used relatively expensive automatic rifles, such as the FN FAL, the HK G3, the M14, and the M16. In contrast, the Russians and Chinese used the AK-47; its low production cost and ease of manufacture allow them to make AKs in vast numbers. In the pro-communist states, the AK-47 became a symbol of the Third World revolution. They were utilized in the Cambodian Civil War and the Cambodian–Vietnamese War. During the 1980s, the Soviet Union became the principal arms dealer to countries embargoed by Western nations, including Middle Eastern nations such as Libya and Syria, which welcomed Soviet Union backing against Israel. After the fall of the Soviet Union, AK-47s were sold both openly and on the black market to any group with cash, including drug cartels and dictatorial states, and more recently they have been seen in the hands of Islamic groups such as Al-Qaeda, ISIL, and the Taliban in Afghanistan and Iraq, and FARC, Ejército de Liberación Nacional guerrillas in Colombia. In Russia, the Kalashnikov is a tremendous source of national pride. "The family of the inventor of the world's most famous rifle, Mikhail Kalashnikov, has authorized German engineering company MMI to use the well-known Kalashnikov name on a variety

According to Atanasoff's account, several key principles of the Atanasoff–Berry computer were conceived in a sudden insight after a long nighttime drive to Rock Island, Illinois, during the winter of 1937–38. The ABC innovations included electronic computation, binary arithmetic, parallel processing, regenerative capacitor memory, and a separation of memory and computing functions. The mechanical and logic design was worked out by Atanasoff over the next year. A grant application to build a proof of concept prototype was submitted in March 1939 to the Agronomy department, which was also interested in speeding up computation for economic and research analysis. $5,000 of further funding () to complete the machine came from the nonprofit Research Corporation of New York City. The ABC was built by Atanasoff and Berry in the basement of the physics building at Iowa State College during 1939–1942. The initial funds were released in September, and the 11-tube prototype was first demonstrated in October 1939. A December demonstration prompted a grant for construction of the full-scale machine. The ABC was built and tested over the next two years. A January 15, 1941, story in the Des Moines Register announced the ABC as "an electrical computing machine" with more than 300 vacuum tubes that would "compute complicated algebraic equations" (but gave no precise technical description of the computer). The system weighed more than . It contained approximately of wire, 280 dual-triode vacuum tubes, 31 thyratrons, and was about the size of a desk. It was not programmable, which distinguishes it from more general machines of the same era, such as Konrad Zuse's 1941 Z3 and the Colossus computers of 1943–1945. Nor did it implement the stored-program architecture, first implemented in the Manchester Baby of 1948, required for fully general-purpose practical computing machines. The machine was, however, the first to implement three critical ideas that are still part of every modern computer: Using binary digits to represent all numbers and data. Performing all calculations using electronics rather than wheels, ratchets, or mechanical switches. Organizing a system in which computation and memory are separated. The memory of the Atanasoff–Berry computer was a system called regenerative capacitor memory, which consisted of a pair of drums, each containing 1600 capacitors that rotated on a common shaft once per second. The capacitors on each drum were organized into 32 "bands" of 50 (30 active bands and two spares in case a capacitor failed), giving the machine a speed of 30 additions/subtractions per second. Data was represented as 50-bit binary fixed-point numbers. The electronics of the memory and arithmetic units could store and operate on 60 such numbers at a time (3000 bits). The alternating current power-line frequency of 60 Hz was the primary clock rate for the lowest-level operations. The arithmetic logic functions were fully electronic, implemented with vacuum tubes. The family of logic gates ranged from inverters to two- and three-input gates. The input and output levels and operating voltages were compatible between the different gates. Each gate consisted of one inverting vacuum-tube amplifier, preceded by a resistor divider input network that defined the logical function. The control logic functions, which only needed to operate once per drum rotation and therefore did not require electronic speed, were electromechanical, implemented with relays. The ALU operated on only one bit of each number at a time; it kept the carry/borrow bit in a capacitor for use in the next AC cycle. Although the Atanasoff–Berry computer was an important step up from earlier calculating machines, it was not able to run entirely automatically through an entire problem. An operator was needed to operate the control switches to set up its functions, much like the electro-mechanical calculators and unit record equipment of the time. Selection of the operation to be performed, reading, writing, converting to or from binary to decimal, or reducing a set of equations was made by front-panel switches and, in some cases, jumpers. There were two forms of input and output: primary user input and output and an intermediate results output and input. The intermediate results storage allowed operation on problems too large to be handled entirely within the electronic memory. (The largest problem that could be solved without the use of the intermediate output and input was two simultaneous equations, a trivial problem.) Intermediate results were binary, written onto paper sheets by electrostatically modifying the resistance at 1500 locations to represent 30 of the 50-bit numbers (one equation). Each sheet could be written or read in one second. The reliability of the system was limited to about 1 error in 100,000 calculations by these units, primarily attributed to lack of control of the sheets' material characteristics. In retrospect, a solution could have been to add a parity bit to each number as written. This problem was not solved by the time Atanasoff left the university for war-related work. Primary user input was decimal, via standard IBM 80-column punched cards, and output was decimal, via a front-panel display. Function The ABC was designed

John Mauchly and J. Presper Eckert, was considered to be the first computer in the modern sense, but in 1973 a U.S. District Court invalidated the ENIAC patent and concluded that the ENIAC inventors had derived the subject matter of the electronic digital computer from Atanasoff. When, in the mid-1970s, the secrecy surrounding the British World War II development of the Colossus computers that pre-dated ENIAC, was lifted and Colossus was described at a conference in Los Alamos, New Mexico, in June 1976, John Mauchly and Konrad Zuse were reported to have been astonished. Design and construction According to Atanasoff's account, several key principles of the Atanasoff–Berry computer were conceived in a sudden insight after a long nighttime drive to Rock Island, Illinois, during the winter of 1937–38. The ABC innovations included electronic computation, binary arithmetic, parallel processing, regenerative capacitor memory, and a separation of memory and computing functions. The mechanical and logic design was worked out by Atanasoff over the next year. A grant application to build a proof of concept prototype was submitted in March 1939 to the Agronomy department, which was also interested in speeding up computation for economic and research analysis. $5,000 of further funding () to complete the machine came from the nonprofit Research Corporation of New York City. The ABC was built by Atanasoff and Berry in the basement of the physics building at Iowa State College during 1939–1942. The initial funds were released in September, and the 11-tube prototype was first demonstrated in October 1939. A December demonstration prompted a grant for construction of the full-scale machine. The ABC was built and tested over the next two years. A January 15, 1941, story in the Des Moines Register announced the ABC as "an electrical computing machine" with more than 300 vacuum tubes that would "compute complicated algebraic equations" (but gave no precise technical description of the computer). The system weighed more than . It contained approximately of wire, 280 dual-triode vacuum tubes, 31 thyratrons, and was about the size of a desk. It was not programmable, which distinguishes it from more general machines of the same era, such as Konrad Zuse's 1941 Z3 and the Colossus computers of 1943–1945. Nor did it implement the stored-program architecture, first implemented in the Manchester Baby of 1948, required for fully general-purpose practical computing machines. The machine was, however, the first to implement three critical ideas that are still part of every modern computer: Using binary digits to represent all numbers and data. Performing all calculations using electronics rather than wheels, ratchets, or mechanical switches. Organizing a system in which computation and memory are separated. The memory of the Atanasoff–Berry computer was a system called regenerative capacitor memory, which consisted of a pair of drums, each containing 1600 capacitors that rotated on a common shaft once per second. The capacitors on each drum were organized into 32 "bands" of 50 (30 active bands and two spares in case a capacitor failed), giving the machine a speed of 30 additions/subtractions per second. Data was represented as 50-bit binary fixed-point numbers. The electronics of the memory and arithmetic units could store and operate on 60 such numbers at a time (3000 bits). The alternating current power-line frequency of 60 Hz was the primary clock rate for the lowest-level operations. The arithmetic logic functions were fully electronic, implemented with vacuum tubes. The family of logic gates ranged from inverters to two- and three-input

northern Andes but are now greatly diminished, especially in the Chocó and inter-Andean valleys of Colombia. Opposite of the humid Andean slopes are the relatively dry Andean slopes in most of western Peru, Chile and Argentina. Along with several Interandean Valles, they are typically dominated by deciduous woodland, shrub and xeric vegetation, reaching the extreme in the slopes near the virtually lifeless Atacama Desert. About 30,000 species of vascular plants live in the Andes, with roughly half being endemic to the region, surpassing the diversity of any other hotspot. The small tree Cinchona pubescens, a source of quinine which is used to treat malaria, is found widely in the Andes as far south as Bolivia. Other important crops that originated from the Andes are tobacco and potatoes. The high-altitude Polylepis forests and woodlands are found in the Andean areas of Colombia, Ecuador, Peru, Bolivia and Chile. These trees, by locals referred to as Queñua, Yagual and other names, can be found at altitudes of above sea level. It remains unclear if the patchy distribution of these forests and woodlands is natural, or the result of clearing which began during the Incan period. Regardless, in modern times the clearance has accelerated, and the trees are now considered to be highly endangered, with some believing that as little as 10% of the original woodland remains. Fauna The Andes are rich in fauna: With almost 1,000 species, of which roughly 2/3 are endemic to the region, the Andes are the most important region in the world for amphibians. The diversity of animals in the Andes is high, with almost 600 species of mammals (13% endemic), more than 1,700 species of birds (about 1/3 endemic), more than 600 species of reptile (about 45% endemic), and almost 400 species of fish (about 1/3 endemic). The vicuña and guanaco can be found living in the Altiplano, while the closely related domesticated llama and alpaca are widely kept by locals as pack animals and for their meat and wool. The crepuscular (active during dawn and dusk) chinchillas, two threatened members of the rodent order, inhabit the Andes' alpine regions. The Andean condor, the largest bird of its kind in the Western Hemisphere, occurs throughout much of the Andes but generally in very low densities. Other animals found in the relatively open habitats of the high Andes include the huemul, cougar, foxes in the genus Pseudalopex, and, for birds, certain species of tinamous (notably members of the genus Nothoprocta), Andean goose, giant coot, flamingos (mainly associated with hypersaline lakes), lesser rhea, Andean flicker, diademed sandpiper-plover, miners, sierra-finches and diuca-finches. Lake Titicaca hosts several endemics, among them the highly endangered Titicaca flightless grebe and Titicaca water frog. A few species of hummingbirds, notably some hillstars, can be seen at altitudes above , but far higher diversities can be found at lower altitudes, especially in the humid Andean forests ("cloud forests") growing on slopes in Colombia, Ecuador, Peru, Bolivia and far northwestern Argentina. These forest-types, which includes the Yungas and parts of the Chocó, are very rich in flora and fauna, although few large mammals exist, exceptions being the threatened mountain tapir, spectacled bear and yellow-tailed woolly monkey. Birds of humid Andean forests include mountain-toucans, quetzals and the Andean cock-of-the-rock, while mixed species flocks dominated by tanagers and furnariids commonly are seen – in contrast to several vocal but typically cryptic species of wrens, tapaculos and antpittas. A number of species such as the royal cinclodes and white-browed tit-spinetail are associated with Polylepis, and consequently also threatened. Human activity The Andes Mountains form a north–south axis of cultural influences. A long series of cultural development culminated in the expansion of the Inca civilization and Inca Empire in the central Andes during the 15th century. The Incas formed this civilization through imperialistic militarism as well as careful and meticulous governmental management. The government sponsored the construction of aqueducts and roads in addition to preexisting installations. Some of these constructions are still in existence today. Devastated by European diseases and by civil war, the Incas were defeated in 1532 by an alliance composed of tens of thousands of allies from nations they had subjugated (e.g. Huancas, Chachapoyas, Cañaris) and a small army of 180 Spaniards led by Francisco Pizarro. One of the few Inca sites the Spanish never found in their conquest was Machu Picchu, which lay hidden on a peak on the eastern edge of the Andes where they descend to the Amazon. The main surviving languages of the Andean peoples are those of the Quechua and Aymara language families. Woodbine Parish and Joseph Barclay Pentland surveyed a large part of the Bolivian Andes from 1826 to 1827. Cities In modern times, the largest cities in the Andes are Bogotá, with a population of about eight million, Santiago, Medellín, Cali, and Quito. Lima is a coastal city adjacent to the Andes and is the largest city of all Andean countries. It is the seat of the Andean Community of Nations. La Paz, Bolivia's seat of government, is the highest capital city in the world, at an elevation of approximately . Parts of the La Paz conurbation, including the city of El Alto, extend up to . Other cities in or near the Andes include Bariloche, Catamarca, Jujuy, Mendoza, Salta, San Juan, and Tucumán in Argentina; Calama and Rancagua in Chile; Cochabamba, Oruro, Potosí, Sucre, Sacaba, Tarija, and Yacuiba in Bolivia; Arequipa, Cajamarca, Cusco, Huancayo, Huánuco, Huaraz, Juliaca, and Puno in Peru; Ambato, Cuenca, Ibarra, Latacunga, Loja, Riobamba and Tulcán in Ecuador; Armenia, Cúcuta, Bucaramanga, Duitama, Ibagué, Ipiales, Manizales, Palmira, Pasto, Pereira, Popayán, Sogamoso, Tunja, and Villavicencio in Colombia; and Barquisimeto, La Grita, Mérida, San Cristóbal, Tovar, Trujillo, and Valera in Venezuela. The cities of Caracas, Valencia, and Maracay are in the Venezuelan Coastal Range, which is a debatable extension of the Andes at the northern extremity of South America. Transportation Cities and large towns are connected with asphalt-paved roads, while smaller towns are often connected by dirt roads, which may require a four-wheel-drive vehicle. The rough terrain has historically put the costs of building highways and railroads that cross the Andes out of reach of most neighboring countries, even with modern civil engineering practices. For example, the main crossover of the Andes between Argentina and Chile is still accomplished through the Paso Internacional Los Libertadores. Only recently the ends of some highways that came rather close to one another from the east and the west have been connected. Much of the transportation of passengers is done via aircraft. However, there is one railroad that connects Chile with Peru via the Andes, and there are others that make the same connection via southern Bolivia. See railroad maps of that region. There are multiple highways in Bolivia that cross the Andes. Some of these were built during a period of war between Bolivia and Paraguay, in order to transport Bolivian troops and their supplies to the war front in the lowlands of southeastern Bolivia and western Paraguay. For decades, Chile claimed ownership of land on the eastern side of the Andes. However, these claims were given up in about 1870 during the War of the Pacific between Chile, the allied Bolivia and Peru, in a diplomatic deal to keep Peru out of the war. The Chilean Army and Chilean Navy defeated the combined forces of Bolivia and Peru, and Chile took over Bolivia's only province on the Pacific Coast, some land from Peru that was returned to Peru decades later. Bolivia has been a completely landlocked country ever since. It mostly uses seaports in eastern Argentina and Uruguay for international trade because its diplomatic relations with Chile have been suspended since 1978. Because of the tortuous terrain in places, villages and towns in the mountains—to which travel via motorized vehicles is of little use—are still located in the high Andes of Chile, Bolivia, Peru, and Ecuador. Locally, the relatives of the camel, the llama, and the alpaca continue to carry out important uses as pack animals, but this use has generally diminished in modern times. Donkeys, mules, and horses are also useful. Agriculture The ancient peoples of the Andes such as the Incas have practiced irrigation techniques for over 6,000 years. Because of the mountain slopes, terracing has been a common practice. Terracing, however, was only extensively employed after Incan imperial expansions to fuel their expanding realm. The potato holds a very important role as an internally consumed staple crop. Maize was also an important crop for these people, and was used for the production of chicha, important to Andean native people. Currently, tobacco, cotton and coffee are the main export crops. Coca, despite eradication programmes in some countries, remains an important crop for legal local use in a mildly stimulating herbal tea, and, both controversially and illegally, for the production of cocaine. Irrigation In unirrigated land, pasture is the most common type of land use. In the rainy season (summer), part of the rangeland is used for cropping (mainly potatoes, barley, broad beans and wheat). Irrigation is helpful in advancing the sowing data of the summer crops which guarantees an early yield in the period of food shortage. Also, by early sowing, maize can be cultivated higher up in the mountains (up to ). In addition, it makes cropping in the dry season (winter) possible and allows the cultivation of frost-resistant vegetable crops like onion and carrot. Mining The Andes rose to fame for their mineral wealth during the Spanish conquest of South America. Although Andean Amerindian peoples crafted ceremonial jewelry of gold and other metals, the mineralizations of the Andes were first mined on a large scale after the Spanish arrival. Potosí in present-day Bolivia and Cerro de Pasco

inter-Andean valleys of Colombia. Opposite of the humid Andean slopes are the relatively dry Andean slopes in most of western Peru, Chile and Argentina. Along with several Interandean Valles, they are typically dominated by deciduous woodland, shrub and xeric vegetation, reaching the extreme in the slopes near the virtually lifeless Atacama Desert. About 30,000 species of vascular plants live in the Andes, with roughly half being endemic to the region, surpassing the diversity of any other hotspot. The small tree Cinchona pubescens, a source of quinine which is used to treat malaria, is found widely in the Andes as far south as Bolivia. Other important crops that originated from the Andes are tobacco and potatoes. The high-altitude Polylepis forests and woodlands are found in the Andean areas of Colombia, Ecuador, Peru, Bolivia and Chile. These trees, by locals referred to as Queñua, Yagual and other names, can be found at altitudes of above sea level. It remains unclear if the patchy distribution of these forests and woodlands is natural, or the result of clearing which began during the Incan period. Regardless, in modern times the clearance has accelerated, and the trees are now considered to be highly endangered, with some believing that as little as 10% of the original woodland remains. Fauna The Andes are rich in fauna: With almost 1,000 species, of which roughly 2/3 are endemic to the region, the Andes are the most important region in the world for amphibians. The diversity of animals in the Andes is high, with almost 600 species of mammals (13% endemic), more than 1,700 species of birds (about 1/3 endemic), more than 600 species of reptile (about 45% endemic), and almost 400 species of fish (about 1/3 endemic). The vicuña and guanaco can be found living in the Altiplano, while the closely related domesticated llama and alpaca are widely kept by locals as pack animals and for their meat and wool. The crepuscular (active during dawn and dusk) chinchillas, two threatened members of the rodent order, inhabit the Andes' alpine regions. The Andean condor, the largest bird of its kind in the Western Hemisphere, occurs throughout much of the Andes but generally in very low densities. Other animals found in the relatively open habitats of the high Andes include the huemul, cougar, foxes in the genus Pseudalopex, and, for birds, certain species of tinamous (notably members of the genus Nothoprocta), Andean goose, giant coot, flamingos (mainly associated with hypersaline lakes), lesser rhea, Andean flicker, diademed sandpiper-plover, miners, sierra-finches and diuca-finches. Lake Titicaca hosts several endemics, among them the highly endangered Titicaca flightless grebe and Titicaca water frog. A few species of hummingbirds, notably some hillstars, can be seen at altitudes above , but far higher diversities can be found at lower altitudes, especially in the humid Andean forests ("cloud forests") growing on slopes in Colombia, Ecuador, Peru, Bolivia and far northwestern Argentina. These forest-types, which includes the Yungas and parts of the Chocó, are very rich in flora and fauna, although few large mammals exist, exceptions being the threatened mountain tapir, spectacled bear and yellow-tailed woolly monkey. Birds of humid Andean forests include mountain-toucans, quetzals and the Andean cock-of-the-rock, while mixed species flocks dominated by tanagers and furnariids commonly are seen – in contrast to several vocal but typically cryptic species of wrens, tapaculos and antpittas. A number of species such as the royal cinclodes and white-browed tit-spinetail are associated with Polylepis, and consequently also threatened. Human activity The Andes Mountains form a north–south axis of cultural influences. A long series of cultural development culminated in the expansion of the Inca civilization and Inca Empire in the central Andes during the 15th century. The Incas formed this civilization through imperialistic militarism as well as careful and meticulous governmental management. The government sponsored the construction of aqueducts and roads in addition to preexisting installations. Some of these constructions are still in existence today. Devastated by European diseases and by civil war, the Incas were defeated in 1532 by an alliance composed of tens of thousands of allies from nations they had subjugated (e.g. Huancas, Chachapoyas, Cañaris) and a small army of 180 Spaniards led by Francisco Pizarro. One of the few Inca sites the Spanish never found in their conquest was Machu Picchu, which lay hidden on a peak on the eastern edge of the Andes where they descend to the Amazon. The main surviving languages of the Andean peoples are those of the Quechua and Aymara language families. Woodbine Parish and Joseph Barclay Pentland surveyed a large part of the Bolivian Andes from 1826 to 1827. Cities In modern times, the largest cities in the Andes are Bogotá, with a population of about eight million, Santiago, Medellín, Cali, and Quito. Lima is a coastal city adjacent to the Andes and is the largest city of all Andean countries. It is the seat of the Andean Community of Nations. La Paz, Bolivia's seat of government, is the highest capital city in the world, at an elevation of approximately . Parts of the La Paz conurbation, including the city of El Alto, extend up to . Other cities in or near the Andes include Bariloche, Catamarca, Jujuy, Mendoza, Salta, San Juan, and Tucumán in Argentina; Calama and Rancagua in Chile; Cochabamba, Oruro, Potosí, Sucre, Sacaba, Tarija, and Yacuiba in Bolivia; Arequipa, Cajamarca, Cusco, Huancayo, Huánuco, Huaraz, Juliaca, and Puno in Peru; Ambato, Cuenca, Ibarra, Latacunga, Loja, Riobamba and Tulcán in Ecuador; Armenia, Cúcuta, Bucaramanga, Duitama, Ibagué, Ipiales, Manizales, Palmira, Pasto, Pereira, Popayán, Sogamoso, Tunja, and Villavicencio in Colombia; and Barquisimeto, La Grita, Mérida, San Cristóbal, Tovar, Trujillo, and Valera in Venezuela. The cities of Caracas, Valencia, and Maracay are in the Venezuelan Coastal Range, which is a debatable extension of the Andes at the northern extremity of South America. Transportation Cities and large towns are connected with asphalt-paved roads, while smaller towns are often connected by dirt roads, which may require a four-wheel-drive vehicle. The rough terrain has historically put the costs of building highways and railroads that cross the Andes out of reach of most neighboring countries, even with modern civil engineering practices. For example, the main crossover of the Andes between Argentina and Chile is still accomplished through the Paso Internacional Los Libertadores. Only recently the ends of some highways that came rather close to one another from the east and the west have been connected. Much of the transportation of passengers is done via aircraft. However, there is one railroad that connects Chile with Peru via the Andes, and there are others that make the same connection via southern Bolivia. See railroad maps of that region. There are multiple highways in Bolivia that cross the Andes. Some of these were built during a period of war between Bolivia and Paraguay, in order to transport Bolivian troops and their supplies to the war front in the lowlands of southeastern Bolivia and western Paraguay. For decades, Chile claimed ownership of land on the eastern side of the Andes. However, these claims were given up in about 1870 during the War of the Pacific between Chile, the allied Bolivia and Peru, in a diplomatic deal to keep Peru out of the war. The Chilean Army and Chilean Navy defeated the combined forces of Bolivia and Peru, and Chile took over Bolivia's only province on the Pacific Coast, some land from Peru that was returned to Peru decades later. Bolivia has been a completely landlocked country ever since. It mostly uses seaports in eastern Argentina and Uruguay for international trade because its diplomatic relations with Chile have been suspended since 1978. Because of the tortuous terrain in places, villages and towns in the mountains—to which travel via motorized vehicles is of little use—are still located in the high Andes of Chile, Bolivia, Peru, and Ecuador. Locally, the relatives of the camel, the llama, and the alpaca continue to carry out important uses as pack animals, but this use has generally diminished in modern times. Donkeys, mules, and horses are also useful. Agriculture The ancient peoples of the Andes such as the Incas have practiced irrigation techniques for over 6,000 years. Because of the mountain slopes, terracing has been a common practice. Terracing, however, was only extensively employed after Incan imperial expansions to fuel their expanding realm. The potato holds a very important role as an internally consumed staple crop. Maize was also an important crop for these people, and was used for the production of chicha, important to Andean native people. Currently, tobacco, cotton and coffee are the main export crops. Coca, despite eradication programmes in some countries, remains an important crop for legal local use in a mildly stimulating herbal tea, and, both controversially and illegally, for the production of cocaine. Irrigation In unirrigated land, pasture is the most common type of land use. In the rainy season (summer), part of the rangeland is used for cropping (mainly potatoes, barley, broad beans and wheat). Irrigation is helpful in advancing the sowing data of the summer crops which guarantees an early yield in the period of food shortage. Also, by early sowing, maize can be cultivated higher up in the mountains (up to ). In addition, it makes cropping

is typically from the middle Miocene of Sansan, in Gers, France, may indicate a distinct genus. Limb-bones resembling those of Macrotherium, but relatively stouter, have been described from the Pliocene beds of Attica and Samos as Ancylotherium. In the Americas, the names Morothorium and Moropus have been applied to similar bones, in the belief that they indicated Xenarthrans.

the Ancylopoda to be outside Perissodactyla or, as was popular more recently, to be related to Brontotheria. Macrotherium, which is typically from the middle Miocene of Sansan, in Gers, France, may indicate a distinct genus. Limb-bones resembling those of Macrotherium,

back to the surface. Plough anchors sometimes have difficulty setting at all, and instead skip across the seafloor. By contrast, modern efficient anchors tend to be "scoop" types that dig ever deeper. Delta anchor The Delta anchor was derived from the CQR. It was patented by Philip McCarron, James Stewart, and Gordon Lyall of British marine manufacturer Simpson-Lawrence Ltd in 1992. It was designed as an advance over the anchors used for floating systems such as oil rigs. It retains the weighted tip of the CQR but has a much higher fluke area to weight ratio than its predecessor. The designers also eliminated the sometimes troublesome hinge. It is a plough anchor with a rigid, arched shank. It is described as self-launching because it can be dropped from a bow roller simply by paying out the rode, without manual assistance. This is an oft copied design with the European Brake and Australian Sarca Excel being two of the more notable ones. Although it is a plough type anchor, it sets and holds reasonably well in hard bottoms. Danforth anchor American Richard Danforth invented the Danforth Anchor in the 1940s for use aboard landing craft. It uses a stock at the crown to which two large flat triangular flukes are attached. The stock is hinged so the flukes can orient toward the bottom (and on some designs may be adjusted for an optimal angle depending on the bottom type). Tripping palms at the crown act to tip the flukes into the seabed. The design is a burying variety, and once well set can develop high resistance. Its lightweight and compact flat design make it easy to retrieve and relatively easy to store; some anchor rollers and hawsepipes can accommodate a fluke-style anchor. A Danforth will not usually penetrate or hold in gravel or weeds. In boulders and coral it may hold by acting as a hook. If there is much current, or if the vessel is moving while dropping the anchor, it may "kite" or "skate" over the bottom due to the large fluke area acting as a sail or wing. The FOB HP anchor designed in Brittany in the 1970s is a Danforth variant designed to give increased holding through its use of rounded flukes setting at a 30° angle. The Fortress is an American aluminum alloy Danforth variant which can be disassembled for storage and it features an adjustable 32° and 45° shank/fluke angle to improve holding capability in common sea bottoms such as hard sand and soft mud. This anchor performed well in a 1989 US Naval Sea Systems Command (NAVSEA) test and in an August 2014 holding power test that was conducted in the soft mud bottoms of the Chesapeake Bay. Bruce or claw anchor This claw-shaped anchor was designed by Peter Bruce from the Isle of Man in the 1970s. Bruce gained his early reputation from the production of large-scale commercial anchors for ships and fixed installations such as oil rigs. It was later scaled down for small boats, and copies of this very popular design abound. The Bruce and its copies, known generically as "claw type anchors", have been adopted on smaller boats (partly because they stow easily on a bow roller) but they are most effective in larger sizes. Claw anchors are quite popular on charter fleets as their percentage set on the first try in many bottom types is very high. They have the reputation of not breaking out with tide or wind changes, instead slowly turning in the bottom to align with the force. Bruce anchors can have difficulty penetrating weedy bottoms and grass. They offer a fairly low holding-power-to-weight ratio and generally have to be oversized to compete with newer types. Scoop type anchors Three time circumnavigator German Rolf Kaczirek invented the Bügel Anker in the 1980s. Kaczirek wanted an anchor that was self-righting without necessitating a ballasted tip. Instead he added a roll bar. Instead of a plough share, he used a flat blade design. As none of the innovations of this anchor were patented, copies of it abound. Alain Poiraud of France introduced the scoop type anchor in 1996. Similar in design to the Bügel anchor, Poiraud's design features a concave fluke shaped like the blade of a shovel, with a shank attached parallel to the fluke, and the load applied toward the digging end. It is designed to dig into the bottom like a shovel, and dig deeper as more pressure is applied. The common challenge with all the scoop type anchors is that they set so well, they can be difficult to weigh. Bügelanker, or Wasi: This German-designed bow anchor has a sharp tip for penetrating weed, and features a roll-bar which allows the correct setting attitude to be achieved without the need for extra weight to be inserted into the tip. Spade: This is a French design which has proved successful since 1996. It features a demountable shank (hollow in some instances) and the choice of galvanized steel, stainless steel, or aluminium construction, which means a lighter and more easily stowable anchor. The geometry also makes this anchor self stowing on a single roller. Rocna: This New Zealand spade design, available in galvanised or stainless steel, has been produced since 2004. It has a roll-bar (similar to that of the Bügel), a large spade-like fluke area, and a sharp toe for penetrating weed and grass. The Rocna sets quickly and holds well. Mantus: This is claimed to be a fast setting anchor with high holding power. It is designed as an all round anchor capable of setting even in challenging bottoms such as hard sand/clay bottoms and grass. The shank is made out of a high tensile steel capable of withstanding high loads. It is similar in design to the Rocna but has a larger and wider roll-bar that reduces the risk of fouling and increases the angle of the fluke which results in improved penetration in some bottoms. Ultra: This is an innovative spade design that dispenses with a roll-bar. Made primarily of stainless steel, its main arm is hollow, while the fluke tip has lead within it. It is very similar in appearance to the Spade anchor. Vulcan: A recent sibling to the Rocna, this anchor performs similarly but does not have a roll-bar. Instead the Vulcan has patented design features such as the "V-bulb" and the "Roll Palm" that allow it to dig in deeply. The Vulcan was designed primarily for sailors who had difficulties accommodating the roll-bar Rocna on their bow. Peter Smith (originator of the Rocna) designed it specifically for larger powerboats. Both Vulcans and Rocnas are available in galvanised steel, or in stainless steel. The Vulcan is very similar in appearance to the Spade anchor. Knox Anchor: This is produced in Scotland and was invented by Professor John Knox. It has a divided concave large area fluke arrangement and a shank in high tensile steel. A roll bar similar to the Rocna gives fast setting and a holding power of about 40 times anchor weight. Other temporary anchors Mud weight: Consists of a blunt heavy weight, usually cast iron or cast lead, that will sink into the mud and resist lateral movement. Suitable only for very soft silt bottoms and in mild conditions. Sizes range between 5 and 20 kg for small craft. Various designs exist and many are home produced from lead or improvised with heavy objects. This is a very commonly used method on the Norfolk Broads in England. Bulwagga: This is a unique design featuring three flukes instead of the usual two. It has performed well in tests by independent sources such as American boating magazine Practical Sailor. Permanent anchors These are used where the vessel is permanently or semi-permanently sited, for example in the case of lightvessels or channel marker buoys. The anchor needs to hold the vessel in all weathers, including the most severe storm, but needs to be lifted only occasionally, at most – for example, only if the vessel is to be towed into port for maintenance. An alternative to using an anchor under these circumstances, especially if the anchor need never be lifted at all, may be to use a pile which is driven into the seabed. Permanent anchors come in a wide range of types and have no standard form. A slab of rock with an iron staple in it to attach a chain to would serve the purpose, as would any dense object of appropriate weight (for instance, an engine block). Modern moorings may be anchored by augers, which look and act very much like oversized screws drilled into the seabed, or by barbed metal beams pounded in (or even driven in with explosives) like pilings, or by a variety of other non-mass means of getting a grip on the bottom. One method of building a mooring is to use three or more conventional anchors laid out with short lengths of chain attached to a swivel, so no matter which direction the vessel moves, one or more anchors will be aligned to resist the force. Mushroom The mushroom anchor is suitable where the seabed is composed of silt or fine sand. It was invented by Robert Stevenson, for use by an 82-ton converted fishing boat, Pharos, which was used as a lightvessel between 1807 and 1810 near to Bell Rock whilst the lighthouse was being constructed. It was equipped with a 1.5-ton example. It is shaped like an inverted mushroom, the head becoming buried in the silt. A counterweight is often provided at the other end of the shank to lay it down before it becomes buried. A mushroom anchor will normally sink in the silt to the point where it has displaced its own weight in bottom material, thus greatly increasing its holding power. These anchors are only suitable for a silt or mud bottom, since they rely upon suction and cohesion of the bottom material, which rocky or coarse sand bottoms lack. The holding power of this anchor is at best about twice its weight until it becomes buried, when it can be as much as ten times its weight. They are available in sizes from about 5 kg up to several tons. Deadweight This is an anchor which relies solely on being a heavy weight. It is usually just a large block of concrete or stone at the end of the chain. Its holding power is defined by its weight underwater (i.e. taking its buoyancy into account) regardless of the type of seabed, although suction can increase this if it becomes buried. Consequently, deadweight anchors are used where mushroom anchors are unsuitable, for example in rock, gravel or coarse sand. An advantage of a deadweight anchor over a mushroom is that if it does become dragged, then it continues to provide its original holding force. The disadvantage of using deadweight anchors in conditions where a mushroom anchor could be used is that it needs to be around ten times the weight of the equivalent mushroom anchor.

(or inside a recess in the hull). While there are numerous variations, stockless anchors consist of a set of heavy flukes connected by a pivot or ball and socket joint to a shank. Cast into the crown of the anchor is a set of tripping palms, projections that drag on the bottom, forcing the main flukes to dig in. Small boat anchors Until the mid-20th century, anchors for smaller vessels were either scaled-down versions of admiralty anchors, or simple grapnels. As new designs with greater holding-power-to-weight ratios were sought, a great variety of anchor designs has emerged. Many of these designs are still under patent, and other types are best known by their original trademarked names. Grapnel anchor A traditional design, the grapnel is merely a shank with four or more tines. It has a benefit in that, no matter how it reaches the bottom, one or more tines will be aimed to set. In coral, or rock, it is often able to set quickly by hooking into the structure, but may be more difficult to retrieve. A grapnel is often quite light, and may have additional uses as a tool to recover gear lost overboard. Its weight also makes it relatively easy to move and carry, however its shape is generally not very compact and it may be awkward to stow unless a collapsing model is used. Grapnels rarely have enough fluke area to develop much hold in sand, clay, or mud. It is not unknown for the anchor to foul on its own rode, or to foul the tines with refuse from the bottom, preventing it from digging in. On the other hand, it is quite possible for this anchor to find such a good hook that, without a trip line from the crown, it is impossible to retrieve. Herreshoff anchor Designed by yacht designer L. Francis Herreshoff, this is essentially the same pattern as an admiralty anchor, albeit with small diamond-shaped flukes or palms. The novelty of the design lay in the means by which it could be broken down into three pieces for stowage. In use, it still presents all the issues of the admiralty pattern anchor. Northill anchor Originally designed as a lightweight anchor for seaplanes, this design consists of two plough-like blades mounted to a shank, with a folding stock crossing through the crown of the anchor. CQR plough anchor Many manufacturers produce a plough-type anchor, so-named after its resemblance to an agricultural plough. All such anchors are copied from the original CQR (Coastal Quick Release, or Clyde Quick Release, later rebranded as 'secure' by Lewmar), a 1933 design patented in the UK by mathematician Geoffrey Ingram Taylor. Plough anchors stow conveniently in a roller at the bow, and have been popular with cruising sailors and private boaters. Ploughs can be moderately good in all types of seafloor, though not exceptional in any. Contrary to popular belief, the CQR's hinged shank is not to allow the anchor to turn with direction changes rather than breaking out, but actually to prevent the shank's weight from disrupting the fluke's orientation while setting. The hinge can wear out and may trap a sailor's fingers. Some later plough anchors have a rigid shank, such as the Lewmar's "Delta". A plough anchor has a fundamental flaw: like its namesake, the agricultural plough, it will dig in but then tends to break out back to the surface. Plough anchors sometimes have difficulty setting at all, and instead skip across the seafloor. By contrast, modern efficient anchors tend to be "scoop" types that dig ever deeper. Delta anchor The Delta anchor was derived from the CQR. It was patented by Philip McCarron, James Stewart, and Gordon Lyall of British marine manufacturer Simpson-Lawrence Ltd in 1992. It was designed as an advance over the anchors used for floating systems such as oil rigs. It retains the weighted tip of the CQR but has a much higher fluke area to weight ratio than its predecessor. The designers also eliminated the sometimes troublesome hinge. It is a plough anchor with a rigid, arched shank. It is described as self-launching because it can be dropped from a bow roller simply by paying out the rode, without manual assistance. This is an oft copied design with the European Brake and Australian Sarca Excel being two of the more notable ones. Although it is a plough type anchor, it sets and holds reasonably well in hard bottoms. Danforth anchor American Richard Danforth invented the Danforth Anchor in the 1940s for use aboard landing craft. It uses a stock at the crown to which two large flat triangular flukes are attached. The stock is hinged so the flukes can orient toward the bottom (and on some designs may be adjusted for an optimal angle depending on the bottom type). Tripping palms at the crown act to tip the flukes into the seabed. The design is a burying variety, and once well set can develop high resistance. Its lightweight and compact flat design make it easy to retrieve and relatively easy to store; some anchor rollers and hawsepipes can accommodate a fluke-style anchor. A Danforth will not usually penetrate or hold in gravel or weeds. In boulders and coral it may hold by acting as a hook. If there is much current, or if the vessel is moving while dropping the anchor, it may "kite" or "skate" over the bottom due to the large fluke area acting as a sail or wing. The FOB HP anchor designed in Brittany in the 1970s is a Danforth variant designed to give increased holding through its use of rounded flukes setting at a 30° angle. The Fortress is an American aluminum alloy Danforth variant which can be disassembled for storage and it features an adjustable 32° and 45° shank/fluke angle to improve holding capability in common sea bottoms such as hard sand and soft mud. This anchor performed well in a 1989 US Naval Sea Systems Command (NAVSEA) test and in an August 2014 holding power test that was conducted in the soft mud bottoms of the Chesapeake Bay. Bruce or claw anchor This claw-shaped anchor was designed by Peter Bruce from the Isle of Man in the 1970s. Bruce gained his early reputation from the production of large-scale commercial anchors for ships and fixed installations such as oil rigs. It was later scaled down for small boats, and copies of this very popular design abound. The Bruce and its copies, known generically as "claw type anchors", have been adopted on smaller boats (partly because they stow easily on a bow roller) but they are most effective in larger sizes. Claw anchors are quite popular on charter fleets as their percentage set on the first try in many bottom types is very high. They have the reputation of not breaking out with tide or wind changes, instead slowly turning in the bottom to align with the force. Bruce anchors can have difficulty penetrating weedy bottoms and grass. They offer a fairly low holding-power-to-weight ratio and generally have to be oversized to compete with newer types. Scoop type anchors Three time circumnavigator German Rolf Kaczirek invented the Bügel Anker in the 1980s. Kaczirek wanted an anchor that was self-righting without necessitating a ballasted tip. Instead he added a roll bar. Instead of a plough share, he used a flat blade design. As none of the innovations of this anchor were patented, copies of it abound. Alain Poiraud of France introduced the scoop type anchor in 1996. Similar in design to the Bügel anchor, Poiraud's design features a concave fluke shaped like the blade of a shovel, with a shank attached parallel to the fluke, and the load applied toward the digging end. It is designed to dig into the bottom like a shovel, and dig deeper as more pressure is applied. The common challenge with all the scoop type anchors is that they set so well, they can be difficult to weigh. Bügelanker, or Wasi: This German-designed bow anchor has a sharp tip for penetrating weed, and features a roll-bar which allows the correct setting attitude to be achieved without the need for extra weight to be inserted into the tip. Spade: This is a French design which has proved successful since 1996. It features a demountable shank (hollow in some instances) and the choice of galvanized steel, stainless steel, or aluminium construction, which means a lighter and more easily stowable anchor. The geometry also makes this anchor self stowing on a single roller. Rocna: This New Zealand spade design, available in galvanised or stainless steel, has been produced since 2004. It has a roll-bar (similar to that of the Bügel), a large spade-like fluke area, and a sharp toe for penetrating weed and grass. The Rocna sets quickly and holds well. Mantus: This is claimed to be a fast setting anchor with high holding power. It is designed as an all round anchor capable of setting even in challenging bottoms such as hard sand/clay bottoms and grass. The shank is made out of a high tensile steel capable of withstanding high loads. It is similar in design to the Rocna but has a larger and wider roll-bar that reduces the risk of fouling and increases the angle of the fluke which results in improved penetration in some bottoms. Ultra: This is an innovative spade design that dispenses with a roll-bar. Made primarily of stainless steel, its main arm is hollow, while the fluke tip has lead within it. It is very similar in appearance to the Spade anchor. Vulcan: A recent sibling to the Rocna, this anchor performs similarly but does not have a roll-bar. Instead the Vulcan has patented design features such as the "V-bulb" and the "Roll Palm" that allow it to dig in deeply. The Vulcan was designed primarily for sailors who had difficulties accommodating the roll-bar Rocna on their bow. Peter Smith (originator of the Rocna) designed it specifically for larger powerboats. Both Vulcans and Rocnas are available in galvanised steel, or in stainless steel. The Vulcan is very similar in appearance to the Spade anchor. Knox Anchor: This is produced in Scotland and was invented by Professor John Knox. It has a divided concave large area fluke arrangement and a shank in high tensile steel. A roll bar similar to the Rocna gives fast setting and a holding power of about 40 times anchor weight. Other temporary anchors Mud weight: Consists of a blunt heavy weight, usually cast iron or cast lead, that will sink into the mud and resist lateral movement. Suitable only for very soft silt bottoms and in mild conditions. Sizes range between 5 and 20 kg for small craft. Various designs exist and many are home produced from lead or improvised with heavy objects. This is a very commonly used method on the Norfolk Broads in England. Bulwagga: This is a unique design featuring three flukes instead of the usual two. It has performed well in tests by independent sources such as American boating magazine Practical Sailor. Permanent anchors These are used where the vessel is permanently or semi-permanently sited, for example in the case of lightvessels or channel marker buoys. The anchor needs to hold the vessel in all weathers, including the most severe storm, but needs to be lifted only occasionally, at most – for example, only if the vessel is to be towed into port

name to the Al-Anbar Governorate. History Origins The city is located on the left bank of the Middle Euphrates, at the junction with the Nahr Isa canal, the first of the navigable canals that link the Euphrates to the River Tigris to the east. The origins of the city are unknown, but ancient, perhaps dating to the Babylonian era and even earlier: the local artificial mound of Tell Aswad dates to . Sasanian period The town was originally known as Misiche (Greek: ), Mesiche (), or Massice ( mšyk; mšyk). As a major crossing point of the Euphrates, and occupying the northernmost point of the complex irrigation network of the Sawad, the town was of considerable strategic significance. As the western gate to central Mesopotamia, it was fortified by the Sasanian ruler Shapur I () to shield his capital, Ctesiphon, from the Roman Empire. After his decisive defeat of the Roman emperor Gordian III at the Battle of Misiche in 244, Shapur renamed the town to Peroz-Shapur (Pērōz-Šāpūr or Pērōz-Šābuhr, from , meaning "victorious Shapur"; in ; in ). It became known as Pirisapora or Bersabora () to the Greeks and Romans. The city was fortified by a double wall, possibly through the use of Roman prisoner labour; it was sacked and burned after an agreement with its garrison in March 363 by the Roman emperor Julian during his invasion of the Sasanian Empire. It was rebuilt by Shapur II. By 420, it is attested as a bishopric, both for the Church of the East and for the Syriac Orthodox Church. The town's garrison was Persian, but it also contained sizeable Arab and Jewish populations. Anbar was adjacent or identical to the Babylonian Jewish center of Nehardea (), and lies a short distance from the present-day town of Fallujah, formerly the Babylonian Jewish center of Pumbedita (). Islamic period The city fell to the Rashidun Caliphate in July 633, after a fiercely fought siege. The Arabs retained the name (Fīrūz Shābūr) for the surrounding district, but the town itself became known as Anbar (Middle Persian word for "granary" or "storehouse") from the granaries in its citadel, a name that had appeared already during the 6th century. According to Baladhuri, the third mosque to be built in Iraq was erected in the city by Sa'd ibn

According to medieval Arabic sources, most of the inhabitants of the town migrated north to found the city of Hdatta south of Mosul. The famous governor al-Hajjaj ibn Yusuf cleared the canals of the city. Abu'l-Abbas as-Saffah (), the founder of the Abbasid Caliphate, made it his capital in 752, constructing a new town half a farsakh () to the north for his Khurasani troops. There he died and was buried at the palace he had built. His successor, al-Mansur (), remained in the city until the founding of Baghdad in 762. The Abbasids also dug the great Nahr Isa canal to the south of the city, which carried water and commerce east to Baghdad. Thee Nahr al-Saqlawiyya or Nahr al-Qarma canal, which branches off from the Euphrates to the west of the city, is sometimes erroneously held to be the Nahr Isa, but it is more likely that it is to be identified with the pre-Islamic Nahr al-Rufayl. It continued to be a place of much importance throughout the Abbasid period. Caliph Harun al-Rashid () stayed at the town in 799 and in 803. The town's prosperity was founded on agricultural activities, but also on trade between Iraq and Syria. The town was still prosperous in the early 9th century, but the decline of Abbasid authority during the later 9th century exposed it to Bedouin attacks in 882 and 899. In 927, the Qarmatians under Abu Tahir al-Jannabi sacked the city, and the devastation was compounded by another Bedouin attack two years later. The town's decline accelerated after that: while the early 10th-century geographer Istakhri still calls the town modest but populous, with the ruins of the buildings of as-Saffah still visible, Ibn Hawqal and al-Maqdisi, who wrote a generation later, attest to its decline, and the diminution of its population. The town was sacked again in 1262 by the Mongols under Kerboka. The Ilkhanids retained Anbar as an administrative centre, a role it retained until the first half of the 14th century; the Ilkhanid minister Shams al-Din Juvayni had a canal dug from the city to Najaf, and the city was surrounded by a wall of sun-dried bricks. Ecclesiastical history Anbar used to host an Assyrian community from the fifth century: the town was the seat of a bishopric of the Church of the East. The names of fourteen of its bishops of the period 486–1074 are known, three of whom became Chaldean Patriarchs of Babylon. Narses Simeon Salibazachi Paul Theodosius John Enos 890 Elias Jaballaha Sebarjesus Elias II Unnamed bishop Mundar Maris Zacharias Titular see Anbar is listed by the Catholic Church as a titular see of the Chaldean Catholic Church, established as titular bishopric in 1980. It has had the following incumbents: Titular Archbishop Stéphane Katchou (1980.10.03 – 1981.11.10), as Coadjutor Archeparch of Bassorah of the Chaldeans (Iraq) (1980.10.03 – 1981.11.10) Titular Bishop Ibrahim Namo Ibrahim (1982.01.11 – 1985.08.03), as Apostolic Exarch in the United States of America (1982.01.11 – 1985.08.03)

Greeks and Armenians, until it was formally part of the Armenian Kingdom of Cilicia. Within the fortress are two Armenian chapels and the magnificent (but severely damaged) three-aisle church built by T‛oros I to celebrate his conquests. The church was once surrounded by a continuous, well-executed dedicatory inscription in Armenian. The Mamluk Empire of Egypt finally destroyed the city in 1374. The present wall of the lower city is of late construction. It encloses a mass of ruins conspicuous in which are a fine triumphal arch, the colonnades of two streets, a gymnasium, etc. A stadium and a theatre lie outside the walls to the south. The remains of the acropolis fortifications are very interesting, including roads and ditches hewn in the rock. There are no notable structures in the upper town. For picturesqueness the site is not equaled in Cilicia, and it is worthwhile to trace the three fine aqueducts to their sources. A necropolis on the escarpment to the south of the curtain wall can also be seen complete with signs of illegal modern excavations. A visit in December 2002 showed that the three aqueducts mentioned above have been nearly completely destroyed. Only small, isolated sections are left standing with the largest portion lying in a pile of rubble that stretches the length of where the aqueducts once stood. A powerful earthquake that struck the area in 1945 is thought to be responsible for the destruction. A modest Turkish farming village (Dilekkaya) lies to the southwest of the ancient city. A small outdoor museum with some of the artifacts collected in the area can be viewed for a small fee. Also nearby are some beautiful mosaics discovered in a farmers field. Inquire at the museum for a viewing. Anazarbus/Anavarsa was one of a chain of Armenian fortifications stretching through Cilicia. The castle of Sis (modern Kozan, Adana) lies to the north while Tumlu Castle and Yilankale are to the south, and the fortresses of Amouda and Sarvandikar are to the east. In 2013, excavations uncovered the first known colonnaded double-lane road of the ancient world, 34 meters wide and 2700 meters long, also uncovered the ruins of a church and a bathhouse. In 2017, archaeologists discovered a limestone statue of the goddess Hygieia and the god Eros. The statue is thought to date to the third or fourth century B.C. Ecclesiastical history Anazarbus was the capital and so also from 553 (the date of the Second Council of Constantinople) the metropolitan see of the Late Roman province of Cilicia Secunda. In the 4th century, one of the bishops of Anazarbus was Athanasius, a "consistent expounder of the theology of Arius." His theological opponent, Athanasius of Alexandria, in De Synodis 17, 1 refers to Anazarbus as Ναζαρβῶν. Maximin of Anazarbus attended the Council of Chalcedon. A 6th century Notitia Episcopatuum indicates that it had as suffragan sees Epiphania, Alexandria Minor, Irenopolis, Flavias, Castabala and Aegeae. Rhosus was also subject to Anazarbus, but after the 6th century was made exempt, and Mopsuestia was raised to the rank of autocephalous metropolitan see, though without suffragans. Latin Catholic titular see The titular archbishopric was revived in the 18th century as a see of the Latin Catholic church, Anazarbus. It is vacant, having had the following incumbents, generally of the highest (Metropolitan) rank, with an episcopal (lowest rank) exception : Titular Archbishop Giuseppe Maria Saporiti (1726.04.08 – 1743.12.02) Titular Bishop Isidro Alfonso Cavanillas (1753.04.09 – 1755.05.12) Titular Archbishop Gerolamo Formagliari (1760.07.21 – 1781) Titular Archbishop Romain-Frédéric Gallard (1839.02.21 – 1839.09.28) Titular Archbishop Andon Bedros Hassoun (1842.06.07 – 1846.08.02), as Coadjutor Archeparch of Istanbul of the Armenians (Turkey) (1842.06.07 – 1846.08.02), succeeded as Archeparch of Istanbul of the Armenians (Turkey) (1846.08.02 – 1866.09.14), later Patriarch of Cilicia of the Armenians (Lebanon) ([1866.09.14] 1867.07.12 – 1881.06), created Cardinal-Priest

the Greeks and Armenians, until it was formally part of the Armenian Kingdom of Cilicia. Within the fortress are two Armenian chapels and the magnificent (but severely damaged) three-aisle church built by T‛oros I to celebrate his conquests. The church was once surrounded by a continuous, well-executed dedicatory inscription in Armenian. The Mamluk Empire of Egypt finally destroyed the city in 1374. The present wall of the lower city is of late construction. It encloses a mass of ruins conspicuous in which are a fine triumphal arch, the colonnades of two streets, a gymnasium, etc. A stadium and a theatre lie outside the walls to the south. The remains of the acropolis fortifications are very interesting, including roads and ditches hewn in the rock. There are no notable structures in the upper town. For picturesqueness the site is not equaled in Cilicia, and it is worthwhile to trace the three fine aqueducts to their sources. A necropolis on the escarpment to the south of the curtain wall can also be seen complete with signs of illegal modern excavations. A visit in December 2002 showed that the three aqueducts mentioned above have been nearly completely destroyed. Only small, isolated sections are left standing with the largest portion lying in a pile of rubble that stretches the length of where the aqueducts once stood. A powerful earthquake that struck the area in 1945 is thought to be responsible for the destruction. A modest Turkish farming village (Dilekkaya) lies to the southwest of the ancient city. A small outdoor museum with some of the artifacts collected in the area can be viewed for a small fee. Also nearby are some beautiful mosaics discovered in a farmers field. Inquire at the museum for a viewing. Anazarbus/Anavarsa was one of a chain of Armenian fortifications stretching through Cilicia. The castle of Sis (modern Kozan, Adana) lies to the north while Tumlu Castle and Yilankale are to the south, and the fortresses of Amouda and Sarvandikar are to the east. In 2013, excavations uncovered the first known colonnaded double-lane road of the ancient world, 34 meters wide and 2700 meters long, also uncovered the ruins of a church and a bathhouse. In 2017, archaeologists discovered a limestone statue of the goddess Hygieia and the god Eros. The statue is thought to date to the third or fourth century B.C. Ecclesiastical history Anazarbus was the capital and so also from 553 (the date of the Second Council of Constantinople) the metropolitan see of the Late Roman province of Cilicia Secunda. In the 4th century, one of the bishops of Anazarbus was Athanasius, a "consistent expounder of the theology of Arius." His theological opponent, Athanasius of Alexandria, in De Synodis 17, 1 refers to Anazarbus as Ναζαρβῶν. Maximin of Anazarbus attended the Council of Chalcedon. A 6th century Notitia Episcopatuum indicates that it had as suffragan sees Epiphania, Alexandria Minor, Irenopolis, Flavias, Castabala and Aegeae. Rhosus was also subject to Anazarbus, but after the 6th century was made exempt, and Mopsuestia was raised to the rank of autocephalous metropolitan see, though without suffragans. Latin Catholic titular see The titular archbishopric was revived in the 18th century as a see of the Latin Catholic church, Anazarbus. It is vacant, having had the following incumbents, generally of the highest (Metropolitan) rank, with an episcopal (lowest rank) exception : Titular Archbishop Giuseppe Maria Saporiti (1726.04.08 – 1743.12.02) Titular Bishop Isidro Alfonso Cavanillas (1753.04.09 – 1755.05.12) Titular Archbishop Gerolamo Formagliari (1760.07.21 – 1781) Titular Archbishop Romain-Frédéric Gallard (1839.02.21 – 1839.09.28) Titular Archbishop Andon Bedros Hassoun (1842.06.07 – 1846.08.02), as Coadjutor Archeparch of Istanbul of the Armenians (Turkey) (1842.06.07 – 1846.08.02), succeeded as Archeparch of Istanbul of the Armenians (Turkey) (1846.08.02 – 1866.09.14), later Patriarch of Cilicia of the Armenians (Lebanon) ([1866.09.14] 1867.07.12 – 1881.06), created Cardinal-Priest of Ss. Vitale, Valeria, Gervasio e Protasio (1880.12.16 – 1884.02.28) Titular Archbishop Giorgio Labella, Friars Minor (O.F.M.) (1847.06.04 – 1860.10.27) Titular Archbishop Charles Petre Eyre (1868.12.03 – 1878.03.15) Titular Archbishop John Baptist Salpointe (1884.04.22 – 1885.08.18) Titular Archbishop Michael Logue (1887.04.19 – 1887.12.03) (later Cardinal)* Titular Archbishop François Laurencin (1888.06.01 – 1892.12.18) Titular Archbishop Joaquín Larraín Gandarillas (1893.06.15 – 1897.09.26) Titular Archbishop Raimondo Ingheo (1907.12.16 – 1911.07.08) Titular Archbishop Cláudio José Gonçalves Ponce de Leon, Lazarists (C.M.) (1912.01.09 – 1924.05.26) Titular Archbishop Raymund Netzhammer, Benedictine Order(] O.S.B.) (1924.07.14 – 1945.09.18) Titular Archbishop Michele Akras (1945.10.27 – 1947.02.05) Titular Archbishop Heinrich Döring (ハインリヒ・デーリング), S.J. (1948.01.15 – 1951.12.17) Titular Archbishop Joseph-Marie Le Gouaze (1955.06.24 – 1964.07.31) Armenian Catholic titular see In the 19th century, an Armenian Catholic titular bishopric of Anazarbus (of the Armenians) (Anazarbus degli Armeni in Curiate Italian)

(Greek: The monster (or wonder) of Ness with the diamond-shaped fin) for the apocryphal Loch Ness Monster. Shortly afterwards, several London newspapers pointed out that anagrams into Monster hoax by Sir Peter S. However, Robert Rines, who previously made two underwater photographs allegedly showing the monster, countered that they can also be arranged into Yes, both pix are monsters, R. Pseudonyms Anagrams are connected to pseudonyms, by the fact that they may conceal or reveal, or operate somewhere in between like a mask that can establish identity. For example, Jim Morrison used an anagram of his name in the Doors song "L.A. Woman", calling himself "Mr. Mojo Risin'". The use of anagrams and fabricated personal names may be to circumvent restrictions on the use of real names, as happened in the 18th century when Edward Cave wanted to get around restrictions imposed on the reporting of the House of Commons. In a genre such as farce or parody, anagrams as names may be used for pointed and satiric effect. Pseudonyms adopted by authors are sometimes transposed forms of their names; thus "Calvinus" becomes "Alcuinus" (here V = U) or "François Rabelais" = "Alcofribas Nasier". The name "Voltaire" of François Marie Arouet fits this pattern, and is allowed to be an anagram of "Arouet, l[e] j[eune]" (U = V, J = I) that is, "Arouet the younger". Other examples include: "Damon Albarn" = "Dan Abnormal" "Dave Barry" = "Ray Adverb" "Arrigo Boito" = "Tobia Gorrio" "Buckethead" = "Death Cube K" "Daniel Clowes" = "Enid Coleslaw" "Siobhán Donaghy" = "Shanghai Nobody" "Glen Duncan" = "Declan Gunn" "(Theodor) Geisel" = "(Theo) Le Sieg" "Edward Gorey" = "Ogdred Weary", = "Regera Dowdy" or = "E. G. Deadworry" (and others) "Anna Madrigal" = "A man and a girl" "Tom Marvolo Riddle" = "I am Lord Voldemort" "Ted Morgan" = "(Sanche) de Gramont" "Lorin Morgan-Richards" = "Marcil d'Hirson Garron" "Vladimir Nabokov" = "Vivian Darkbloom", = "Vivian Bloodmark", = "Blavdak Vinomori", or = "Dorian Vivalkomb" Several of these are "imperfect anagrams", letters having been left out in some cases for the sake of easy pronunciation. Titles Anagrams used for titles afford scope for some types of wit. Examples: Homer Hickam, Jr.'s book Rocket Boys was adapted into the 1999 film October Sky. The tapes for the revival of the BBC show Doctor Who were labeled with the anagram Torchwood, which later went on to be used as the name for a spin-off show. In multi-episode shows, the program occasionally substitutes the anagram of an actor's name for the actual name to prevent revealing the true identity of the role (for instance, The Master) being played by the actor. The New Wave band Missing Persons' best-selling album was called Spring Session M. Hip-hop artist MF Doom recorded a 2004 album called Mm..Food. Brian Eno's album Before and After Science includes a song entitled "King's Lead Hat", an anagram of "Talking Heads", a band Eno has worked with. Juan Maria Solare's piano ballad "Jura ser anomalía" (literally "he/she swears to be an anomaly") is an anagram of the composer's full name. His composition for English horn titled "A Dot in Time" is an anagram of "Meditation", which describes the piece. The title of his piano piece that is a homage to Claude Debussy is "Seduce Us Badly". Bill Evans's overdubbed piano elegy for fellow jazz pianist Sonny Clark is titled "N.Y.C.'s No Lark," and another composition, "Re: Person I Knew" is a tribute to his producer, Orrin Keepnews. The title of Imogen Heap's album iMegaphone is an anagram of her name. Progressive rock group Rush published a song off their 1989 album Presto titled "Anagram (for Mongo)" that makes use of anagrams in every line of their song. The title of the fifth album by American rock band Interpol, El Pintor, is an anagram of the band's name and also Spanish for "the painter". Many of the song titles on Aphex Twin's ...I Care Because You Do are anagrams of either "Aphex Twin", "The Aphex Twin", or "Richard D James". In Disney's 1964 film Mary Poppins, Dick Van Dyke played Mr. Dawes, Sr., as the anagram of his name, Navckid Keyd. In the credits, the words unscrambled themselves to reveal his name. The title of King Crimson's 1982 song Thela Hun Ginjeet is an anagram of "heat in the jungle". Coincidences In Hebrew, the name "Gernot Zippe" (גרנוט ציפה), the inventor of the Zippe-type centrifuge, is an anagram of the word "centrifuge" (צנטריפוגה). The anagrammer Anu Garg's name results in: "Anagram genius" = "Name is Anu Garg." Games and puzzles Anagrams are in themselves a recreational activity, but they also make up part of many other games, puzzles and game shows. The Jumble is a puzzle found in many newspapers in the United States requiring the unscrambling of letters to find the solution. Cryptic crossword puzzles frequently use anagrammatic clues, usually indicating that they are anagrams by the inclusion of a descriptive term like "confused" or "in disarray". An example would be Businessman burst into tears (9 letters). The solution, stationer, is an anagram of into tears, the letters of which have burst out of their original arrangement to form the name of a type of businessman. Numerous other games and contests involve some element of anagram formation as a basic skill. Some examples: In Anagrams, players flip tiles over one at a time and race to take words. They can "steal" each other's words by rearranging the letters and extending the words. In a version of Scrabble called Clabbers, the name itself is an anagram of Scrabble. Tiles may be placed in any order on the board as long as they anagram to a valid word. On the British game show Countdown, contestants are given 30 seconds to make the longest word from nine random letters. In Boggle, players make constrained words from a grid of sixteen random letters, by joining adjacent cubes. On the British game show BrainTeaser, contestants are shown a word broken into randomly arranged segments and must announce the whole word. At the end of the game there is a "Pyramid" which starts with a three-letter word. A letter appears in the line below to which the player must add the existing letters to find a solution. The pattern continues until the player reaches the final eight-letter anagram. The player wins the game by solving all the anagrams within the allotted time. In Bananagrams, players place tiles from a pool into crossword-style word arrangements in a race to see who can finish the pool of tiles first. Ciphers Multiple anagramming is a technique used to solve some kinds of cryptograms, such as a permutation cipher, a transposition cipher, and the Jefferson disk. Solutions may be computationally found using a Jumble algorithm. Methods of construction Sometimes, it is possible to "see" anagrams in words, unaided by tools, though the more letters involved the more difficult this becomes. The difficulty is that for a word of different letters, there are (factorial of ) different permutations and so different anagrams of the word. Anagram dictionaries can also be used. Computer programs, known as "anagram search", "anagram servers", "anagram solvers", offer a much faster route to creating anagrams, and a large number of these programs are available on the Internet. Some programs use the Anatree algorithm to compute anagrams efficiently. The program or server carries out an exhaustive search of a database of words, to produce a list containing every possible combination of words or phrases from the input word or phrase using a jumble algorithm. Some programs (such as Lexpert) restrict to one-word answers. Many anagram servers (for example, The Words Oracle) can control the search results, by excluding or including certain words, limiting the number or length of words in each anagram, or limiting the number of results. Anagram solvers are often banned from online anagram games. The disadvantage of computer anagram solvers, especially when applied to multi-word anagrams, is their poor understanding of the meaning of the words they are manipulating. They usually cannot filter out meaningful or appropriate anagrams from large numbers of nonsensical word combinations. Some servers attempt to improve on this using statistical techniques that try to combine only words that appear together often. This approach provides only limited success since it fails to recognize ironic and humorous combinations. Some anagrammatists indicate the method they

connected to pseudonyms, by the fact that they may conceal or reveal, or operate somewhere in between like a mask that can establish identity. For example, Jim Morrison used an anagram of his name in the Doors song "L.A. Woman", calling himself "Mr. Mojo Risin'". The use of anagrams and fabricated personal names may be to circumvent restrictions on the use of real names, as happened in the 18th century when Edward Cave wanted to get around restrictions imposed on the reporting of the House of Commons. In a genre such as farce or parody, anagrams as names may be used for pointed and satiric effect. Pseudonyms adopted by authors are sometimes transposed forms of their names; thus "Calvinus" becomes "Alcuinus" (here V = U) or "François Rabelais" = "Alcofribas Nasier". The name "Voltaire" of François Marie Arouet fits this pattern, and is allowed to be an anagram of "Arouet, l[e] j[eune]" (U = V, J = I) that is, "Arouet the younger". Other examples include: "Damon Albarn" = "Dan Abnormal" "Dave Barry" = "Ray Adverb" "Arrigo Boito" = "Tobia Gorrio" "Buckethead" = "Death Cube K" "Daniel Clowes" = "Enid Coleslaw" "Siobhán Donaghy" = "Shanghai Nobody" "Glen Duncan" = "Declan Gunn" "(Theodor) Geisel" = "(Theo) Le Sieg" "Edward Gorey" = "Ogdred Weary", = "Regera Dowdy" or = "E. G. Deadworry" (and others) "Anna Madrigal" = "A man and a girl" "Tom Marvolo Riddle" = "I am Lord Voldemort" "Ted Morgan" = "(Sanche) de Gramont" "Lorin Morgan-Richards" = "Marcil d'Hirson Garron" "Vladimir Nabokov" = "Vivian Darkbloom", = "Vivian Bloodmark", = "Blavdak Vinomori", or = "Dorian Vivalkomb" Several of these are "imperfect anagrams", letters having been left out in some cases for the sake of easy pronunciation. Titles Anagrams used for titles afford scope for some types of wit. Examples: Homer Hickam, Jr.'s book Rocket Boys was adapted into the 1999 film October Sky. The tapes for the revival of the BBC show Doctor Who were labeled with the anagram Torchwood, which later went on to be used as the name for a spin-off show. In multi-episode shows, the program occasionally substitutes the anagram of an actor's name for the actual name to prevent revealing the true identity of the role (for instance, The Master) being played by the actor. The New Wave band Missing Persons' best-selling album was called Spring Session M. Hip-hop artist MF Doom recorded a 2004 album called Mm..Food. Brian Eno's album Before and After Science includes a song entitled "King's Lead Hat", an anagram of "Talking Heads", a band Eno has worked with. Juan Maria Solare's piano ballad "Jura ser anomalía" (literally "he/she swears to be an anomaly") is an anagram of the composer's full name. His composition for English horn titled "A Dot in Time" is an anagram of "Meditation", which describes the piece. The title of his piano piece that is a homage to Claude Debussy is "Seduce Us Badly". Bill Evans's overdubbed piano elegy for fellow jazz pianist Sonny Clark is titled "N.Y.C.'s No Lark," and another composition, "Re: Person I Knew" is a tribute to his producer, Orrin Keepnews. The title of Imogen Heap's album iMegaphone is an anagram of her name. Progressive rock group Rush published a song off their 1989 album Presto titled "Anagram (for Mongo)" that makes use of anagrams in every line of their song. The title of the fifth album by American rock band Interpol, El Pintor, is an anagram of the band's name and also Spanish for "the painter". Many of the song titles on Aphex Twin's ...I Care Because You Do are anagrams of either "Aphex Twin", "The Aphex Twin", or "Richard D James". In Disney's 1964 film Mary Poppins, Dick Van Dyke played Mr. Dawes, Sr., as the anagram of his name, Navckid Keyd. In the credits, the words unscrambled themselves to reveal his name. The title of King Crimson's 1982 song Thela Hun Ginjeet is an anagram of "heat in the jungle". Coincidences In Hebrew, the name "Gernot Zippe" (גרנוט ציפה), the inventor of the Zippe-type centrifuge, is an anagram of the word "centrifuge" (צנטריפוגה). The anagrammer Anu Garg's name results in: "Anagram genius" = "Name is Anu Garg." Games and puzzles Anagrams are in themselves a recreational activity, but they also make up part of many other games, puzzles and game shows. The Jumble is a puzzle found in many newspapers in the United States requiring the unscrambling of letters to find the solution. Cryptic crossword puzzles frequently use anagrammatic clues, usually indicating that they are anagrams by the inclusion of a descriptive term like "confused" or "in disarray". An example would be Businessman burst into tears (9 letters). The solution, stationer, is an anagram of into tears, the letters of which have burst out of their original arrangement to form the name of a type of businessman. Numerous other games and contests involve some element of anagram formation as a basic skill. Some examples: In Anagrams, players flip tiles over one at a time and race to take words. They can "steal" each other's words by rearranging the letters and extending the words. In a version of Scrabble called Clabbers, the name itself is an anagram of Scrabble. Tiles may be placed in any order on the board as long as they anagram to a valid word. On the British game show Countdown, contestants are given 30 seconds to make the longest word from nine random letters. In Boggle, players make constrained words from a grid of sixteen random letters, by joining adjacent cubes. On the British game show BrainTeaser, contestants are shown a word broken into randomly arranged segments and must announce the whole word. At the end of the game there is a "Pyramid" which starts with a three-letter word. A letter appears in the line below to which the player must add the existing letters to find a solution. The pattern continues until the player reaches the final eight-letter anagram. The player wins the game by solving all the anagrams within the allotted time. In Bananagrams, players place tiles from a pool into crossword-style word arrangements in a race to see who can finish the pool of tiles first. Ciphers Multiple anagramming is a technique used to solve some kinds of cryptograms, such as a permutation cipher, a transposition cipher, and the Jefferson disk. Solutions may be computationally found using a Jumble algorithm. Methods of construction Sometimes, it is possible to "see" anagrams in words, unaided by tools, though the more letters involved the more difficult this becomes. The difficulty is that for a word of different letters, there are (factorial of ) different permutations and so different anagrams of the word. Anagram dictionaries can also be used. Computer programs, known as "anagram search", "anagram servers", "anagram solvers", offer a much faster route to creating anagrams, and a large number of these programs are available on the Internet. Some programs use the Anatree algorithm to compute anagrams efficiently. The program or server carries out an exhaustive search of a database of words, to produce a list containing every possible combination of words or phrases from the input word or phrase using a jumble algorithm. Some programs (such as Lexpert) restrict to one-word answers. Many anagram servers (for example, The Words Oracle) can control the search results, by excluding or including certain words, limiting the number or length of words in each anagram, or limiting the number of results. Anagram solvers are often banned from online anagram games. The disadvantage of computer anagram solvers, especially when applied to multi-word anagrams, is their poor understanding of the meaning of the words they are manipulating. They usually cannot filter out meaningful or appropriate anagrams from large numbers of nonsensical word combinations. Some servers attempt to improve on this using statistical techniques that try to combine only words that appear together often. This approach provides only limited success since it fails to recognize ironic and humorous combinations. Some anagrammatists indicate the method they used. Anagrams constructed without the aid of a computer are noted as having been done "manually" or "by hand"; those made by utilizing a computer may be noted "by machine" or "by computer", or may indicate the name of the computer program (using Anagram Genius). There are also a few "natural" instances: English words unconsciously created by switching letters around. The French chaise longue ("long chair") became the American "chaise lounge" by metathesis (transposition of letters and/or sounds). It has also been speculated that the English "curd" comes from the Latin crudus ("raw"). Similarly, the ancient English word for bird was "brid". Prominent anagrammatists The French king Louis XIII had a man named Thomas Billon appointed as his Royal Anagrammatist with an annual salary of 1200 pounds. Among contemporary anagrammers, Anu Garg, created an Internet Anagram Server in 1994 together with the satirical anagram-based newspaper The Anagram Times. Mike Keith has anagrammed the complete text of Moby Dick. He, along with Richard Brodie, has published The Anagrammed Bible that includes anagrammed version of many books of the Bible. Popular television personality Dick Cavett is known for his anagrams of famous celebrities such as Alec Guinness and

interior of Chukotka Autonomous Okrug. Its basin corresponds to the Anadyrsky District of Chukotka. Geography The Anadyr is long and has a basin of . It is frozen from October to late May and has a maximum flow in June with the snowmelt. It is navigable in small boats for about to near Markovo. West of Markovo it is in the Anadyr Highlands (moderate mountains and valleys with a few trees) and east of Markovo it moves into the Anadyr Lowlands (very flat treeless tundra with lakes and bogs). The drop from Markovo to the sea is less than . It rises at about 67°N latitude and 171°E longitude in the Anadyr Highlands, near the headwaters of the Maly Anyuy, flows southwest receiving the waters of the rivers Yablon and Yeropol, turns east around the Shchuchy Range and passes Markvovo and the old site of Anadyrsk, turns north and east and receives the Mayn from the south, thereby encircling the Lebediny Zakaznik, turns northeast to receive the Belaya from the north in the Parapol-Belsky Lowlands, then past Ust-Belaya it turns southeast into the Anadyr Lowlands past the Ust-Tanyurer Zakaznik and receives the Tanyurer from the north. At Lake Krasnoye, it turns east and flows into the Onemen Bay of the Anadyr Estuary. If the Onemen Bay is considered part of the river, it also receives the Velikaya from the south and the Kanchalan from the north. Other important tributaries are the Yablon, Yeropol and Mamolina from the right and the Chineyveyem and Ubiyenka from the left. Its

turns north and east and receives the Mayn from the south, thereby encircling the Lebediny Zakaznik, turns northeast to receive the Belaya from the north in the Parapol-Belsky Lowlands, then past Ust-Belaya it turns southeast into the Anadyr Lowlands past the Ust-Tanyurer Zakaznik and receives the Tanyurer from the north. At Lake Krasnoye, it turns east and flows into the Onemen Bay of the Anadyr Estuary. If the Onemen Bay is considered part of the river, it also receives the Velikaya from the south and the Kanchalan from the north. Other important tributaries are the Yablon, Yeropol and Mamolina from the right and the Chineyveyem and Ubiyenka from the left. Its basin is surrounded by the Amguema and Palyavaam basins to the north, the Bolshoy Anyuy, Oloy and Kolyma basins to the northwest, and the Penzhina basin to the southwest. History In 1648, Semyon Dezhnev reached the mouth of the Anadyr after being shipwrecked on the coast. In 1649, he went upriver and built winter quarters at Anadyrsk. For the next 100 years the Anadyr was the main route from the Arctic to the Pacific and Kamchatka. In the 18th century, the Anadyr was described by the polar explorer Dmitry Laptev. Ecology The country through which it passes is thinly populated, and is dominated by tundra, with a rich variety of plant life. Much of the region has beautiful landscapes, dominated by often spectacular, rugged mountains. For nine months of the year the ground is

1751 and 1772) thus became Ampère's schoolmasters. The young Ampère, however, soon resumed his Latin lessons, which enabled him to master the works of Leonhard Euler and Daniel Bernoulli. French Revolution In addition, Ampère used his access to the latest books to begin teaching himself advanced mathematics at age 12. In later life Ampère claimed that he knew as much about mathematics and science when he was eighteen as ever he knew, but as a polymath, his reading embraced history, travels, poetry, philosophy, and the natural sciences. His mother was a devout Catholic, so Ampère was also initiated into the Catholic faith along with Enlightenment science. The French Revolution (1789–99) that began during his youth was also influential: Ampère's father was called into public service by the new revolutionary government, becoming a justice of the peace in a small town near Lyon. When the Jacobin faction seized control of the Revolutionary government in 1792, his father Jean-Jacques Ampère resisted the new political tides, and he was guillotined on 24 November 1793, as part of the Jacobin purges of the period. In 1796, Ampère, met Julie Carron, and in 1799 they were married. Ampère took his first regular job in 1799 as a mathematics teacher, which gave him the financial security to marry Carron and father his first child, Jean-Jacques (named after his father), the next year. (Jean-Jacques Ampère eventually achieved his own fame as a scholar of languages.) Ampère's maturation corresponded with the transition to the Napoleonic regime in France, and the young father and teacher found new opportunities for success within the technocratic structures favoured by the new French First Consul. In 1802, Ampère was appointed a professor of physics and chemistry at the École Centrale in Bourg-en-Bresse, leaving his ailing wife and infant son Jean-Jacques Antoine Ampère in Lyon. He used his time in Bourg to research mathematics, producing Considérations sur la théorie mathématique de jeu (1802; "Considerations on the Mathematical Theory of Games"), a treatise on mathematical probability that he sent to the Paris Academy of Sciences in 1803. Teaching career After the death of his wife in July 1803, Ampère moved to Paris, where he began a tutoring post at the new École Polytechnique in 1804. Despite his lack of formal qualifications, Ampère was appointed a professor of mathematics at the school in 1809. As well as holding positions at this school until 1828, in 1819 and 1820 Ampère offered courses in philosophy and astronomy, respectively, at the University of Paris, and in 1824 he was elected to the prestigious chair in experimental physics at the Collège de France. In 1814, Ampère was invited to join the class of mathematicians in the new Institut Impérial, the umbrella under which the reformed state Academy of Sciences would sit. Ampère engaged in a diverse array of scientific inquiries during the years leading up to his election to the academy—writing papers and engaging in topics from mathematics and philosophy to chemistry and astronomy, which was customary among the leading scientific intellectuals of the day. Ampère

of mathematicians in the new Institut Impérial, the umbrella under which the reformed state Academy of Sciences would sit. Ampère engaged in a diverse array of scientific inquiries during the years leading up to his election to the academy—writing papers and engaging in topics from mathematics and philosophy to chemistry and astronomy, which was customary among the leading scientific intellectuals of the day. Ampère claimed that "at eighteen years he found three culminating points in his life, his First Communion, the reading of Antoine Leonard Thomas's "Eulogy of Descartes", and the Taking of the Bastille. On the day of his wife's death he wrote two verses from the Psalms, and the prayer, 'O Lord, God of Mercy, unite me in Heaven with those whom you have permitted me to love on earth.' In times of duress he would take refuge in the reading of the Bible and the Fathers of the Church." For a time he took into his family the young student Frédéric Ozanam (1813–1853), one of the founders of the Conference of Charity, later known as the Society of Saint Vincent de Paul. Through Ampère, Ozanam had contact with leaders of the neo-Catholic movement, such as François-René de Chateaubriand, Jean-Baptiste Henri Lacordaire, and Charles Forbes René de Montalembert. Ozanam was beatified by Pope John Paul II in 1998. Work in electromagnetism In September 1820, Ampère's friend and eventual eulogist François Arago showed the members of the French Academy of Sciences the surprising discovery of Danish physicist Hans Christian Ørsted that a magnetic needle is deflected by an adjacent electric current. Ampère began developing a mathematical and physical theory to understand the relationship between electricity and magnetism. Furthering Ørsted's experimental work, Ampère showed that two parallel wires carrying electric currents attract or repel each other, depending on whether the currents flow in the same or opposite directions, respectively - this laid the foundation of electrodynamics. He also applied mathematics in generalizing physical laws from these experimental results. The most important of these was the principle that came to be called Ampère's law, which states that the mutual action of two lengths of current-carrying wire is proportional to their lengths and to the intensities of their currents. Ampère also applied this same principle to magnetism, showing the harmony between his law and French physicist Charles Augustin de Coulomb's law of electric action. Ampère's devotion to, and skill with, experimental techniques anchored his science within the emerging fields of experimental physics. Ampère also provided a physical understanding of the electromagnetic relationship, theorizing the existence of an "electrodynamic molecule" (the forerunner of the idea of the electron) that served as the component element of both electricity and magnetism. Using this physical explanation of electromagnetic motion, Ampère developed a physical account of electromagnetic phenomena that was both empirically demonstrable and mathematically predictive. In 1827, Ampère published his magnum opus, Mémoire sur la théorie mathématique des phénomènes électrodynamiques uniquement déduite de l’experience (Memoir on the Mathematical Theory of Electrodynamic Phenomena, Uniquely Deduced from Experience), the work that coined the name of his new science, electrodynamics, and became known ever after as its founding treatise. In 1827, Ampère was elected a Foreign Member of the Royal Society and in 1828, a foreign member of the Royal Swedish Academy of Science. Probably the highest recognition came from James Clerk Maxwell, who in his "Treatise on Electricity and Magnetism", named Ampère “the Newton of electricity”. Honours 8.10.1825: Member of the Royal Academy of Science, Letters and Fine Arts of Belgium. Legacy In recognition of his contribution to the creation of modern electrical science, an international convention, signed at the 1881 International Exposition of Electricity, established the ampere as a standard unit of electrical measurement, along with the coulomb, volt, ohm, watt and farad, which are named, respectively, after Ampère's contemporaries Charles-Augustin de Coulomb of France, Alessandro Volta of Italy, Georg Ohm of Germany, James Watt of Scotland and Michael Faraday of England. Ampère's name is one of the 72 names inscribed on the Eiffel Tower. Several items are named after Ampère; many streets and squares, schools, a Lyon metro station, a graphics processing unit microarchitecture, a mountain on the moon and an electric ferry in Norway. Writings Considérations sur la théorie mathématique du jeu, Perisse, Lyon Paris 1802, online lesen im Internet-Archiv Partial translations: Magie, W.M. (1963). A Source Book in Physics. Harvard: Cambridge MA. pp. 446–460. . Complete translations: References Further reading (EPUB) External links Ampère and the history of electricity – a French-language, edited by CNRS, site with Ampère's correspondence (full text and critical edition with links to manuscripts pictures, more than 1000 letters), an Ampère bibliography, experiments, and 3D simulations

to N2 and O2, which is the principle behind the catalytic converter. Nitrogen oxides can be formed as kinetic products in the presence of appropriate catalysts, a reaction of great industrial importance in the production of nitric acid: 4 NH3 + 5 O2 → 4 NO + 6 H2O A subsequent reaction leads to NO2: 2 NO + O2 → 2 NO2 The combustion of ammonia in air is very difficult in the absence of a catalyst (such as platinum gauze or warm chromium(III) oxide), due to the relatively low heat of combustion, a lower laminar burning velocity, high auto-ignition temperature, high heat of vaporization, and a narrow flammability range. However, recent studies have shown that efficient and stable combustion of ammonia can be achieved using swirl combustors, thereby rekindling research interest in ammonia as a fuel for thermal power production. The flammable range of ammonia in dry air is 15.15–27.35% and in 100% relative humidity air is 15.95–26.55%. For studying the kinetics of ammonia combustion, knowledge of a detailed reliable reaction mechanism is required, but this has been challenging to obtain. Formation of other compounds In organic chemistry, ammonia can act as a nucleophile in substitution reactions. Amines can be formed by the reaction of ammonia with alkyl halides, although the resulting −NH2 group is also nucleophilic and secondary and tertiary amines are often formed as byproducts. An excess of ammonia helps minimise multiple substitution and neutralises the hydrogen halide formed. Methylamine is prepared commercially by the reaction of ammonia with chloromethane, and the reaction of ammonia with 2-bromopropanoic acid has been used to prepare racemic alanine in 70% yield. Ethanolamine is prepared by a ring-opening reaction with ethylene oxide: the reaction is sometimes allowed to go further to produce diethanolamine and triethanolamine. Amides can be prepared by the reaction of ammonia with carboxylic acid derivatives. Acyl chlorides are the most reactive, but the ammonia must be present in at least a twofold excess to neutralise the hydrogen chloride formed. Esters and anhydrides also react with ammonia to form amides. Ammonium salts of carboxylic acids can be dehydrated to amides so long as there are no thermally sensitive groups present: temperatures of 150–200 °C are required. The hydrogen in ammonia is susceptible to replacement by a myriad of substituents. When dry ammonia gas is heated with metallic sodium it converts to sodamide, NaNH2. With chlorine, monochloramine is formed. Pentavalent ammonia is known as λ5-amine or, more commonly, ammonium hydride. This crystalline solid is only stable under high pressure and decomposes back into trivalent ammonia and hydrogen gas at normal conditions. This substance was once investigated as a possible solid rocket fuel in 1966. Ammonia as a ligand Ammonia can act as a ligand in transition metal complexes. It is a pure σ-donor, in the middle of the spectrochemical series, and shows intermediate hard–soft behaviour (see also ECW model). Its relative donor strength toward a series of acids, versus other Lewis bases, can be illustrated by C-B plots. For historical reasons, ammonia is named ammine in the nomenclature of coordination compounds. Some notable ammine complexes include tetraamminediaquacopper(II) ([Cu(NH3)4(H2O)2]2+), a dark blue complex formed by adding ammonia to a solution of copper(II) salts. Tetraamminediaquacopper(II) hydroxide is known as Schweizer's reagent, and has the remarkable ability to dissolve cellulose. Diamminesilver(I) ([Ag(NH3)2]+) is the active species in Tollens' reagent. Formation of this complex can also help to distinguish between precipitates of the different silver halides: silver chloride (AgCl) is soluble in dilute (2 M) ammonia solution, silver bromide (AgBr) is only soluble in concentrated ammonia solution, whereas silver iodide (AgI) is insoluble in aqueous ammonia. Ammine complexes of chromium(III) were known in the late 19th century, and formed the basis of Alfred Werner's revolutionary theory on the structure of coordination compounds. Werner noted only two isomers (fac- and mer-) of the complex [CrCl3(NH3)3] could be formed, and concluded the ligands must be arranged around the metal ion at the vertices of an octahedron. This proposal has since been confirmed by X-ray crystallography. An ammine ligand bound to a metal ion is markedly more acidic than a free ammonia molecule, although deprotonation in aqueous solution is still rare. One example is the Calomel reaction, where the resulting amidomercury(II) compound is highly insoluble. HgCl2 + 2 NH3 → HgCl(NH2) + NH4Cl Ammonia forms 1:1 adducts with a variety of Lewis acids such as I2, phenol, and Al(CH3)3. Ammonia is a hard base (HSAB theory) and its E & C parameters are EB = 2.31 and C B = 2.04. Its relative donor strength toward a series of acids, versus other Lewis bases, can be illustrated by C-B plots. Detection and determination Ammonia in solution Ammonia and ammonium salts can be readily detected, in very minute traces, by the addition of Nessler's solution, which gives a distinct yellow colouration in the presence of the slightest trace of ammonia or ammonium salts. The amount of ammonia in ammonium salts can be estimated quantitatively by distillation of the salts with sodium or potassium hydroxide, the ammonia evolved being absorbed in a known volume of standard sulfuric acid and the excess of acid then determined volumetrically; or the ammonia may be absorbed in hydrochloric acid and the ammonium chloride so formed precipitated as ammonium hexachloroplatinate, (NH4)2PtCl6. Gaseous ammonia Sulfur sticks are burnt to detect small leaks in industrial ammonia refrigeration systems. Larger quantities can be detected by warming the salts with a caustic alkali or with quicklime, when the characteristic smell of ammonia will be at once apparent. Ammonia is an irritant and irritation increases with concentration; the permissible exposure limit is 25 ppm, and lethal above 500 ppm. Higher concentrations are hardly detected by conventional detectors, the type of detector is chosen according to the sensitivity required (e.g. semiconductor, catalytic, electrochemical). Holographic sensors have been proposed for detecting concentrations up to 12.5% in volume. Ammoniacal nitrogen (NH3-N) Ammoniacal nitrogen (NH3-N) is a measure commonly used for testing the quantity of ammonium ions, derived naturally from ammonia, and returned to ammonia via organic processes, in water or waste liquids. It is a measure used mainly for quantifying values in waste treatment and water purification systems, as well as a measure of the health of natural and man-made water reserves. It is measured in units of mg/L (milligram per litre). History The ancient Greek historian Herodotus mentioned that there were outcrops of salt in an area of Libya that was inhabited by a people called the "Ammonians" (now: the Siwa oasis in northwestern Egypt, where salt lakes still exist). The Greek geographer Strabo also mentioned the salt from this region. However, the ancient authors Dioscorides, Apicius, Arrian, Synesius, and Aëtius of Amida described this salt as forming clear crystals that could be used for cooking and that were essentially rock salt. Hammoniacus sal appears in the writings of Pliny, although it is not known whether the term is identical with the more modern sal ammoniac (ammonium chloride). The fermentation of urine by bacteria produces a solution of ammonia; hence fermented urine was used in Classical Antiquity to wash cloth and clothing, to remove hair from hides in preparation for tanning, to serve as a mordant in dying cloth, and to remove rust from iron. In the form of sal ammoniac (نشادر, nushadir), ammonia was important to the Muslim alchemists as early as the 8th century, first mentioned by the Persian-Arab chemist Jābir ibn Hayyān, and to the European alchemists since the 13th century, being mentioned by Albertus Magnus. It was also used by dyers in the Middle Ages in the form of fermented urine to alter the colour of vegetable dyes. In the 15th century, Basilius Valentinus showed that ammonia could be obtained by the action of alkalis on sal ammoniac. At a later period, when sal ammoniac was obtained by distilling the hooves and horns of oxen and neutralizing the resulting carbonate with hydrochloric acid, the name "spirit of hartshorn" was applied to ammonia. Gaseous ammonia was first isolated by Joseph Black in 1756 by reacting sal ammoniac (ammonium chloride) with calcined magnesia (magnesium oxide). It was isolated again by Peter Woulfe in 1767, by Carl Wilhelm Scheele in 1770 and by Joseph Priestley in 1773 and was termed by him "alkaline air". Eleven years later in 1785, Claude Louis Berthollet ascertained its composition. The Haber–Bosch process to produce ammonia from the nitrogen in the air was developed by Fritz Haber and Carl Bosch in 1909 and patented in 1910. It was first used on an industrial scale in Germany during World War I, following the allied blockade that cut off the supply of nitrates from Chile. The ammonia was used to produce explosives to sustain war efforts. Before the availability of natural gas, hydrogen as a precursor to ammonia production was produced via the electrolysis of water or using the chloralkali process. With the advent of the steel industry in the 20th century, ammonia became a byproduct of the production of coking coal. Applications Solvent Liquid ammonia is the best-known and most widely studied nonaqueous ionising solvent. Its most conspicuous property is its ability to dissolve alkali metals to form highly coloured, electrically conductive solutions containing solvated electrons. Apart from these remarkable solutions, much of the chemistry in liquid ammonia can be classified by analogy with related reactions in aqueous solutions. Comparison of the physical properties of NH3 with those of water shows NH3 has the lower melting point, boiling point, density, viscosity, dielectric constant and electrical conductivity; this is due at least in part to the weaker hydrogen bonding in NH3 and because such bonding cannot form cross-linked networks, since each NH3 molecule has only one lone pair of electrons compared with two for each H2O moleculeGive. The ionic self-dissociation constant of liquid NH3 at −50 °C is about 10−33. Solubility of salts Liquid ammonia is an ionising solvent, although less so than water, and dissolves a range of ionic compounds, including many nitrates, nitrites, cyanides, thiocyanates, metal cyclopentadienyl complexes and metal bis(trimethylsilyl)amides. Most ammonium salts are soluble and act as acids in liquid ammonia solutions. The solubility of halide salts increases from fluoride to iodide. A saturated solution of ammonium nitrate (Divers' solution, named after Edward Divers) contains 0.83 mol solute per mole of ammonia and has a vapour pressure of less than 1 bar even at . Solutions of metals Liquid ammonia will dissolve all of the alkali metals and other electropositive metals such as Ca, Sr, Ba, Eu, and Yb (also Mg using an electrolytic process). At low concentrations (<0.06 mol/L), deep blue solutions are formed: these contain metal cations and solvated electrons, free electrons that are surrounded by a cage of ammonia molecules. These solutions are very useful as strong reducing agents. At higher concentrations, the solutions are metallic in appearance and in electrical conductivity. At low temperatures, the two types of solution can coexist as immiscible phases. Redox properties of liquid ammonia The range of thermodynamic stability of liquid ammonia solutions is very narrow, as the potential for oxidation to dinitrogen, E° (N2 + 6NH4+ + 6e− ⇌ 8NH3), is only +0.04 V. In practice, both oxidation to dinitrogen and reduction to dihydrogen are slow. This is particularly true of reducing solutions: the solutions of the alkali metals mentioned above are stable for several days, slowly decomposing to the metal amide and dihydrogen. Most studies involving liquid ammonia solutions are done in reducing conditions; although oxidation of liquid ammonia is usually slow, there is still a risk of explosion, particularly if transition metal ions are present as possible catalysts. Fertilizer In the US as of 2019, approximately 88% of ammonia was used as fertilizers either as its salts, solutions or anhydrously. When applied to soil, it helps provide increased yields of crops such as maize and wheat. 30% of agricultural nitrogen applied in the US is in the form of anhydrous ammonia and worldwide 110 million tonnes are applied each year. Precursor to nitrogenous compounds Ammonia is directly or indirectly the precursor to most nitrogen-containing compounds. Virtually all synthetic nitrogen compounds are derived from ammonia. An important derivative is nitric acid. This key material is generated via the Ostwald process by oxidation of ammonia with air over a platinum catalyst at , ≈9 atm. Nitric oxide is an intermediate in this conversion: NH3 + 2 O2 → HNO3 + H2O Nitric acid is used for the production of fertilizers, explosives, and many organonitrogen compounds. Ammonia is also used to make the following compounds: Hydrazine, in the Olin Raschig process and the peroxide process Hydrogen cyanide, in the BMA process and the Andrussow process Hydroxylamine and ammonium carbonate, in the Raschig process Phenol, in the Raschig–Hooker process Urea, in the Bosch–Meiser urea process and in Wöhler synthesis Amino acids, using Strecker amino-acid synthesis Acrylonitrile, in the Sohio process Ammonia can also be used to make compounds in reactions which are not specifically named. Examples of such compounds include: ammonium perchlorate, ammonium nitrate, formamide, dinitrogen tetroxide, alprazolam, ethanolamine, ethyl carbamate, hexamethylenetetramine, and ammonium bicarbonate. Cleansing agent Household "ammonia" (also incorrectly called ammonium hydroxide) is a solution of NH3 in water, and is used as a general purpose cleaner for many surfaces. Because ammonia results in a relatively streak-free shine, one of its most common uses is to clean glass, porcelain and stainless steel. It is also frequently used for cleaning ovens and soaking items to loosen baked-on grime. Household ammonia ranges in concentration by weight from 5 to 10% ammonia. United States manufacturers of cleaning products are required to provide the product's material safety data sheet which lists the concentration used. Solutions of ammonia (5–10% by weight) are used as household cleaners, particularly for glass. These solutions are irritating to the eyes and mucous membranes (respiratory and digestive tracts), and to a lesser extent the skin. Experts advise that caution be used to ensure the substance is not mixed into any liquid containing bleach, due to the danger of toxic gas. Mixing with chlorine-containing products or strong oxidants, such as household bleach, can generate chloramines. Experts also warn not to use ammonia-based cleaners (such as glass or window cleaners) on car touchscreens, due to the risk of damage to the screen's anti-glare and anti-fingerprint coatings. Fermentation Solutions of ammonia ranging from 16% to 25% are used in the fermentation industry as a source of nitrogen for microorganisms and to adjust pH during fermentation. Antimicrobial agent for food products As early as in 1895, it was known that ammonia was "strongly antiseptic ... it requires 1.4 grams per litre to preserve beef tea (broth)." In one study, anhydrous ammonia destroyed 99.999% of zoonotic bacteria in 3 types of animal feed, but not silage. Anhydrous ammonia is currently used commercially to reduce or eliminate microbial contamination of beef. Lean finely textured beef (popularly known as "pink slime") in the beef industry is made from fatty beef trimmings (c. 50–70% fat) by removing the fat using heat and centrifugation, then treating it with ammonia to kill E. coli. The process was deemed effective and safe by the US Department of Agriculture based on a study that found that the treatment reduces E. coli to undetectable levels. There have been safety concerns about the process as well as consumer complaints about the taste and smell of ammonia-treated beef. Other Fuel The raw energy density of liquid ammonia is 11.5 MJ/L, which is about a third that of diesel. There is the opportunity to convert ammonia back to hydrogen, where it can be used to power hydrogen fuel cells, or it may be used directly within high-temperature solid oxide direct ammonia fuel cells to provide efficient power sources that do not emit greenhouse gases. The conversion of ammonia to hydrogen via the sodium amide process, either for combustion or as fuel for a proton exchange membrane fuel cell, is possible. Another method is the catalytic decomposition of ammonia using solid catalysts. Conversion to hydrogen would allow the storage of hydrogen at nearly 18 wt% compared to ≈5% for gaseous hydrogen under pressure. Ammonia engines or ammonia motors, using ammonia as a working fluid, have been proposed and occasionally used. The principle is similar to that used in a fireless locomotive, but with ammonia as the working fluid, instead of steam or compressed air. Ammonia engines were used experimentally in the 19th century by Goldsworthy Gurney in the UK and the St. Charles Avenue Streetcar line in New Orleans in the 1870s and 1880s, and during World War II ammonia was used to power buses in Belgium. Ammonia is sometimes proposed as a practical alternative to fossil fuel for internal combustion engines. Its high octane rating of 120 and low flame temperature allows the use of high compression ratios without a penalty of high NOx production. Since ammonia contains no carbon, its combustion cannot produce carbon dioxide, carbon monoxide, hydrocarbons, or soot. Ammonia production currently creates 1.8% of global emissions. "Green ammonia" is ammonia produced by using green hydrogen (hydrogen produced by electrolysis), whereas "blue ammonia" is ammonia produced using blue hydrogen (hydrogen produced by steam methane reforming where the carbon dioxide has been captured and stored). However, ammonia cannot be easily used in existing Otto cycle engines because of its very narrow flammability range, and there are also other barriers to widespread automobile usage. In terms of raw ammonia supplies, plants would have to be built to increase production levels, requiring significant capital and energy sources. Although it is the second most produced chemical (after sulfuric acid), the scale of ammonia production is a small fraction of world petroleum usage. It could be manufactured from renewable energy sources, as well as coal or nuclear power. The 60 MW Rjukan dam in Telemark, Norway, produced ammonia for many years from 1913, providing fertilizer for much of Europe. Despite this, several tests have been run. In 1981, a Canadian company converted a 1981 Chevrolet Impala to operate using ammonia as fuel. In 2007, a University of Michigan pickup powered by ammonia drove from Detroit to San Francisco as part of a demonstration, requiring only one fill-up in Wyoming. Compared to hydrogen as a fuel, ammonia is much more energy efficient, and could be produced, stored, and delivered at a much lower cost than hydrogen, which must be kept compressed or as a cryogenic liquid. Rocket engines have also been fueled by ammonia. The Reaction Motors XLR99 rocket engine that powered the hypersonic research aircraft used liquid ammonia. Although not as powerful as other fuels, it left no soot in the reusable rocket engine, and its density approximately matches the density of the oxidizer, liquid oxygen, which simplified the aircraft's design. In early August 2018, scientists from Australia's Commonwealth Scientific and Industrial Research Organisation (CSIRO) announced the success of developing a process to release hydrogen from ammonia and harvest that at ultra-high purity as a fuel for cars. This uses a special membrane. Two demonstration fuel cell vehicles have the technology, a Hyundai Nexo and Toyota Mirai. In 2020, Saudi Arabia shipped forty metric tons of liquid "blue ammonia" to Japan for use as a fuel. It was produced as a by-product by petrochemical industries, and can be burned without giving off greenhouse gases. Its energy density by volume is nearly double that of liquid hydrogen. If the process of creating it can be scaled up via purely renewable resources, producing green ammonia, it could make a major difference in avoiding climate change. The company ACWA Power and the city of Neom have announced the construction of a green hydrogen and ammonia plant in 2020. Green ammonia is considered as a potential fuel for future container ships. In 2020, the companies DSME and MAN Energy Solutions announced the construction of an ammonia-based ship, DSME plans to commercialize it by 2025. Japan is targeting to bring forward a plan to develop ammonia co-firing technology that can increase the use of ammonia in power generation, as part of efforts to assist domestic and other Asian utilities to accelerate their transition to carbon neutrality. In October 2021, the first International Conference on Fuel Ammonia (ICFA2021) was held. Remediation of gaseous emissions Ammonia is used to scrub SO2 from the burning of fossil fuels, and the resulting product is converted to ammonium sulfate for use as fertilizer. Ammonia neutralises the nitrogen oxide (NOx) pollutants emitted by diesel engines. This technology, called SCR (selective catalytic reduction), relies on a vanadia-based catalyst. Ammonia may be used to mitigate gaseous spills of phosgene. As a hydrogen carrier Due to its attributes, being liquid at ambient temperature under its own vapour pressure and having high volumetric and gravimetric energy density, ammonia is considered a suitable carrier for hydrogen, and may be cheaper than direct transport of liquid hydrogen. Refrigeration – R717 Because of ammonia's vaporization properties, it is a useful refrigerant. It was commonly used before the popularisation of chlorofluorocarbons

Ammonia engines or ammonia motors, using ammonia as a working fluid, have been proposed and occasionally used. The principle is similar to that used in a fireless locomotive, but with ammonia as the working fluid, instead of steam or compressed air. Ammonia engines were used experimentally in the 19th century by Goldsworthy Gurney in the UK and the St. Charles Avenue Streetcar line in New Orleans in the 1870s and 1880s, and during World War II ammonia was used to power buses in Belgium. Ammonia is sometimes proposed as a practical alternative to fossil fuel for internal combustion engines. Its high octane rating of 120 and low flame temperature allows the use of high compression ratios without a penalty of high NOx production. Since ammonia contains no carbon, its combustion cannot produce carbon dioxide, carbon monoxide, hydrocarbons, or soot. Ammonia production currently creates 1.8% of global emissions. "Green ammonia" is ammonia produced by using green hydrogen (hydrogen produced by electrolysis), whereas "blue ammonia" is ammonia produced using blue hydrogen (hydrogen produced by steam methane reforming where the carbon dioxide has been captured and stored). However, ammonia cannot be easily used in existing Otto cycle engines because of its very narrow flammability range, and there are also other barriers to widespread automobile usage. In terms of raw ammonia supplies, plants would have to be built to increase production levels, requiring significant capital and energy sources. Although it is the second most produced chemical (after sulfuric acid), the scale of ammonia production is a small fraction of world petroleum usage. It could be manufactured from renewable energy sources, as well as coal or nuclear power. The 60 MW Rjukan dam in Telemark, Norway, produced ammonia for many years from 1913, providing fertilizer for much of Europe. Despite this, several tests have been run. In 1981, a Canadian company converted a 1981 Chevrolet Impala to operate using ammonia as fuel. In 2007, a University of Michigan pickup powered by ammonia drove from Detroit to San Francisco as part of a demonstration, requiring only one fill-up in Wyoming. Compared to hydrogen as a fuel, ammonia is much more energy efficient, and could be produced, stored, and delivered at a much lower cost than hydrogen, which must be kept compressed or as a cryogenic liquid. Rocket engines have also been fueled by ammonia. The Reaction Motors XLR99 rocket engine that powered the hypersonic research aircraft used liquid ammonia. Although not as powerful as other fuels, it left no soot in the reusable rocket engine, and its density approximately matches the density of the oxidizer, liquid oxygen, which simplified the aircraft's design. In early August 2018, scientists from Australia's Commonwealth Scientific and Industrial Research Organisation (CSIRO) announced the success of developing a process to release hydrogen from ammonia and harvest that at ultra-high purity as a fuel for cars. This uses a special membrane. Two demonstration fuel cell vehicles have the technology, a Hyundai Nexo and Toyota Mirai. In 2020, Saudi Arabia shipped forty metric tons of liquid "blue ammonia" to Japan for use as a fuel. It was produced as a by-product by petrochemical industries, and can be burned without giving off greenhouse gases. Its energy density by volume is nearly double that of liquid hydrogen. If the process of creating it can be scaled up via purely renewable resources, producing green ammonia, it could make a major difference in avoiding climate change. The company ACWA Power and the city of Neom have announced the construction of a green hydrogen and ammonia plant in 2020. Green ammonia is considered as a potential fuel for future container ships. In 2020, the companies DSME and MAN Energy Solutions announced the construction of an ammonia-based ship, DSME plans to commercialize it by 2025. Japan is targeting to bring forward a plan to develop ammonia co-firing technology that can increase the use of ammonia in power generation, as part of efforts to assist domestic and other Asian utilities to accelerate their transition to carbon neutrality. In October 2021, the first International Conference on Fuel Ammonia (ICFA2021) was held. Remediation of gaseous emissions Ammonia is used to scrub SO2 from the burning of fossil fuels, and the resulting product is converted to ammonium sulfate for use as fertilizer. Ammonia neutralises the nitrogen oxide (NOx) pollutants emitted by diesel engines. This technology, called SCR (selective catalytic reduction), relies on a vanadia-based catalyst. Ammonia may be used to mitigate gaseous spills of phosgene. As a hydrogen carrier Due to its attributes, being liquid at ambient temperature under its own vapour pressure and having high volumetric and gravimetric energy density, ammonia is considered a suitable carrier for hydrogen, and may be cheaper than direct transport of liquid hydrogen. Refrigeration – R717 Because of ammonia's vaporization properties, it is a useful refrigerant. It was commonly used before the popularisation of chlorofluorocarbons (Freons). Anhydrous ammonia is widely used in industrial refrigeration applications and hockey rinks because of its high energy efficiency and low cost. It suffers from the disadvantage of toxicity, and requiring corrosion resistant components, which restricts its domestic and small-scale use. Along with its use in modern vapor-compression refrigeration it is used in a mixture along with hydrogen and water in absorption refrigerators. The Kalina cycle, which is of growing importance to geothermal power plants, depends on the wide boiling range of the ammonia–water mixture. Ammonia coolant is also used in the S1 radiator aboard the International Space Station in two loops which are used to regulate the internal temperature and enable temperature dependent experiments. The potential importance of ammonia as a refrigerant has increased with the discovery that vented CFCs and HFCs are extremely potent and stable greenhouse gases. Stimulant Ammonia, as the vapor released by smelling salts, has found significant use as a respiratory stimulant. Ammonia is commonly used in the illegal manufacture of methamphetamine through a Birch reduction. The Birch method of making methamphetamine is dangerous because the alkali metal and liquid ammonia are both extremely reactive, and the temperature of liquid ammonia makes it susceptible to explosive boiling when reactants are added. Textile Liquid ammonia is used for treatment of cotton materials, giving properties like mercerisation, using alkalis. In particular, it is used for prewashing of wool. Lifting gas At standard temperature and pressure, ammonia is less dense than atmosphere and has approximately 45–48% of the lifting power of hydrogen or helium. Ammonia has sometimes been used to fill balloons as a lifting gas. Because of its relatively high boiling point (compared to helium and hydrogen), ammonia could potentially be refrigerated and liquefied aboard an airship to reduce lift and add ballast (and returned to a gas to add lift and reduce ballast). Fuming Ammonia has been used to darken quartersawn white oak in Arts & Crafts and Mission-style furniture. Ammonia fumes react with the natural tannins in the wood and cause it to change colours. Safety The U.S. Occupational Safety and Health Administration (OSHA) has set a 15-minute exposure limit for gaseous ammonia of 35 ppm by volume in the environmental air and an 8-hour exposure limit of 25 ppm by volume. The National Institute for Occupational Safety and Health (NIOSH) recently reduced the IDLH (Immediately Dangerous to Life and Health, the level to which a healthy worker can be exposed for 30 minutes without suffering irreversible health effects) from 500 to 300 based on recent more conservative interpretations of original research in 1943. Other organizations have varying exposure levels. U.S. Navy Standards [U.S. Bureau of Ships 1962] maximum allowable concentrations (MACs): continuous exposure (60 days): 25 ppm / 1 hour: 400 ppm. Ammonia vapour has a sharp, irritating, pungent odour that acts as a warning of potentially dangerous exposure. The average odour threshold is 5 ppm, well below any danger or damage. Exposure to very high concentrations of gaseous ammonia can result in lung damage and death. Ammonia is regulated in the United States as a non-flammable gas, but it meets the definition of a material that is toxic by inhalation and requires a hazardous safety permit when transported in quantities greater than 13,248 L (3,500 gallons). Liquid ammonia is dangerous because it is hygroscopic and because it can cause caustic burns. See for more information. Toxicity The toxicity of ammonia solutions does not usually cause problems for humans and other mammals, as a specific mechanism exists to prevent its build-up in the bloodstream. Ammonia is converted to carbamoyl phosphate by the enzyme carbamoyl phosphate synthetase, and then enters the urea cycle to be either incorporated into amino acids or excreted in the urine. Fish and amphibians lack this mechanism, as they can usually eliminate ammonia from their bodies by direct excretion. Ammonia even at dilute concentrations is highly toxic to aquatic animals, and for this reason it is classified as dangerous for the environment. Atmospheric ammonia plays a key role in the formation of fine particulate matter. Ammonia is a constituent of tobacco smoke. Coking wastewater Ammonia is present in coking wastewater streams, as a liquid by-product of the production of coke from coal. In some cases, the ammonia is discharged to the marine environment where it acts as a pollutant. The Whyalla steelworks in South Australia is one example of a coke-producing facility which discharges ammonia into marine waters. Aquaculture Ammonia toxicity is believed to be a cause of otherwise unexplained losses in fish hatcheries. Excess ammonia may accumulate and cause alteration of metabolism or increases in the body pH of the exposed organism. Tolerance varies among fish species. At lower concentrations, around 0.05 mg/L, un-ionised ammonia is harmful to fish species and can result in poor growth and feed conversion rates, reduced fecundity and fertility and increase stress and susceptibility to bacterial infections and diseases. Exposed to excess ammonia, fish may suffer loss of equilibrium, hyper-excitability, increased respiratory activity and oxygen uptake and increased heart rate. At concentrations exceeding 2.0 mg/L, ammonia causes gill and tissue damage, extreme lethargy, convulsions, coma, and death. Experiments have shown that the lethal concentration for a variety of fish species ranges from 0.2 to 2.0 mg/l. During winter, when reduced feeds are administered to aquaculture stock, ammonia levels can be higher. Lower ambient temperatures reduce the rate of algal photosynthesis so less ammonia is removed by any algae present. Within an aquaculture environment, especially at large scale, there is no fast-acting remedy to elevated ammonia levels. Prevention rather than correction is recommended to reduce harm to farmed fish and in open water systems, the surrounding environment. Storage information Similar to propane, anhydrous ammonia boils below room temperature when at atmospheric pressure. A storage vessel capable of is suitable to contain the liquid. Ammonia is used in numerous different industrial application requiring carbon or stainless steel storage vessels. Ammonia with at least 0.2 percent by weight water content is not corrosive to carbon steel. NH3 carbon steel construction storage tanks with 0.2 percent by weight or more of water could last more than 50 years in service. Experts warn that ammonium compounds not be allowed to come in contact with bases (unless in an intended and contained reaction), as dangerous quantities of ammonia gas could be released. Laboratory The hazards of ammonia solutions depend on the concentration: "dilute" ammonia solutions are usually 5–10% by weight (<5.62 mol/L); "concentrated" solutions are usually prepared at >25% by weight. A 25% (by weight) solution has a density of 0.907 g/cm3, and a solution that has a lower density will be more concentrated. The European Union classification of ammonia solutions is given in the table. The ammonia vapour from concentrated ammonia solutions is severely irritating to the eyes and the respiratory tract, and experts warn that these solutions only be handled in a fume hood. Saturated ("0.880" – see #Properties) solutions can develop a significant pressure inside a closed bottle in warm weather, and experts also warn that the bottle be opened with care; this is not usually a problem for 25% ("0.900") solutions. Experts warn that ammonia solutions not be mixed with halogens, as toxic and/or explosive products are formed. Experts also warn that prolonged contact of ammonia solutions with silver, mercury or iodide salts can also lead to explosive products: such mixtures are often formed in qualitative inorganic analysis, and that it needs to be lightly acidified but not concentrated (<6% w/v) before disposal once the test is completed. Laboratory use of anhydrous ammonia (gas or liquid) Anhydrous ammonia is classified as toxic (T) and dangerous for the environment (N). The gas is flammable (autoignition temperature: 651 °C) and can form explosive mixtures with air (16–25%). The permissible exposure limit (PEL) in the United States is 50 ppm (35 mg/m3), while the IDLH concentration is estimated at 300 ppm. Repeated exposure to ammonia lowers the sensitivity to the smell of the gas: normally the odour is detectable at concentrations of less than 50 ppm, but desensitised individuals may not detect it even at concentrations of 100 ppm. Anhydrous ammonia corrodes copper- and zinc-containing alloys which makes brass fittings not appropriate for handling the gas. Liquid ammonia can also attack rubber and certain plastics. Ammonia reacts violently with the halogens. Nitrogen triiodide, a primary high explosive, is formed when ammonia comes in contact with iodine. Ammonia causes the explosive polymerisation of ethylene oxide. It also forms explosive fulminating compounds with compounds of gold, silver, mercury, germanium or tellurium, and with stibine. Violent reactions have also been reported with acetaldehyde, hypochlorite solutions, potassium ferricyanide and peroxides. Ammonia adsorption followed by FTIR as well as temperature programmed desorption of ammonia (NH3-TPD) are very valuable methods to characterize acid-base properties of heterogeneous catalysts. Production Ammonia is one of the most produced inorganic chemicals, with global production reported at 175 million tonnes in 2018. China accounted for 28.5% of that, followed by Russia at 10.3%, the United States at 9.1%, and India at 6.7%. Before the start of World War I, most ammonia was obtained by the dry distillation of nitrogenous vegetable and animal waste products, including camel dung, where it was distilled by the reduction of nitrous acid and nitrites with hydrogen; in addition, it was produced by the distillation of coal, and also by the decomposition of ammonium salts by alkaline hydroxides such as quicklime: 2 NH4Cl + 2 CaO → CaCl2 + Ca(OH)2 + 2 NH3(g) For small scale laboratory synthesis, one can heat urea and calcium hydroxide: (NH2)2CO + Ca(OH)2 → CaCO3 + 2 NH3 Haber–Bosch Mass production uses the Haber–Bosch process, a gas phase reaction between hydrogen (H2) and nitrogen (N2) at a moderately-elevated temperature (450 °C) and high pressure (): This reaction is exothermic and results in decreased entropy, meaning that the reaction is favoured at lower temperatures and higher pressures. It is difficult and expensive to achieve, as lower temperatures result in slower reaction kinetics (hence a slower reaction rate) and high pressure requires high-strength pressure vessels that are not weakened by hydrogen embrittlement. Diatomic nitrogen is bound together by a triple bond, which makes it rather inert. Yield and efficiency are low, meaning that the output must be continuously separated and extracted for the reaction to proceed at an acceptable pace. Combined with the energy needed to produce hydrogen and purified atmospheric nitrogen, ammonia production is energy-intensive, accounting for 1 to 2% of global energy consumption, 3% of global carbon emissions, and 3 to 5% of natural gas consumption. Electrochemical Ammonia can be synthesized electrochemically. The only required inputs are sources of nitrogen (potentially atmospheric) and hydrogen (water), allowing generation at the point of use. The availability of renewable energy creates the possibility of zero emission production. In 2012, Hideo Hosono's group found that Ru-loaded Electride works well as a catalyst and pursued more efficient formation. This method is implemented in a small plant for ammonia synthesis in Japan. In 2019, Hosono's group found another catalyst, a novel perovskite oxynitride-hydride BaCe, that works at lower temperature and without costly Ruthenium. Another electrochemical synthesis mode involves the reductive formation of lithium nitride, which can be protonated to ammonia, given a proton source. Ethanol has been used as such a source, although it may degrade. One study used lithium electrodeposition in tetrahydrofuran. In 2021, Suryanto et al. replaced ethanol with a tetraalkyl phosphonium salt. This cation can stably undergo deprotonation–reprotonation cycles, while it enhances the medium's ionic conductivity. The study observed production rates of 53 ± nanomoles/s/cm2 at 69 ± 1% faradaic efficiency experiments under 0.5-bar hydrogen and 19.5-bar nitrogen partial pressure at ambient temperature. Role in biological systems and human disease Ammonia is both a metabolic waste and a metabolic input throughout the biosphere. It is an important source of nitrogen for living systems. Although atmospheric nitrogen abounds (more than 75%), few living creatures are capable of using this atmospheric nitrogen in its diatomic form, N2 gas. Therefore, nitrogen fixation is required for the synthesis of amino acids, which are the building blocks of protein. Some plants rely on ammonia and other nitrogenous wastes incorporated into the soil by decaying matter. Others, such as nitrogen-fixing legumes, benefit from symbiotic relationships with rhizobia that create ammonia from atmospheric nitrogen. Biosynthesis In certain organisms, ammonia is produced from atmospheric nitrogen by enzymes called nitrogenases. The overall process is called nitrogen fixation. Intense effort has been directed toward understanding the mechanism of biological nitrogen fixation; the scientific interest in this problem is motivated by the unusual structure of the active site of the enzyme, which consists of an Fe7MoS9 ensemble. Ammonia is also a metabolic product of amino acid deamination catalyzed by enzymes such as glutamate dehydrogenase 1. Ammonia excretion is common in aquatic animals. In humans, it is quickly converted to urea, which is much less toxic, particularly less basic. This urea is a major component of the dry weight of urine. Most reptiles, birds, insects, and snails excrete uric acid solely as nitrogenous waste. Physiology Ammonia also plays a role in both normal and abnormal animal physiology. It is biosynthesised through normal amino acid metabolism and is toxic in high concentrations. The liver converts ammonia to urea through a series of reactions known as the urea cycle. Liver dysfunction, such as that seen in cirrhosis, may lead to elevated amounts of ammonia in the blood (hyperammonemia). Likewise, defects in the enzymes responsible for the urea cycle, such as ornithine transcarbamylase, lead to hyperammonemia. Hyperammonemia contributes to the confusion and coma of hepatic encephalopathy, as well as the neurologic disease common in people with urea cycle defects and organic acidurias. Ammonia is important for normal animal acid/base balance. After formation of ammonium from glutamine, α-ketoglutarate may be degraded to produce two bicarbonate ions, which are then available as buffers for dietary acids. Ammonium is excreted in the urine, resulting in net acid loss. Ammonia may itself diffuse across the renal tubules, combine with a hydrogen ion, and thus allow for further acid excretion. Excretion Ammonium ions are a toxic waste product of metabolism in animals. In fish and aquatic invertebrates, it is excreted directly into the water. In mammals, sharks, and amphibians, it is converted in the urea cycle to urea, which is less toxic and can be stored more efficiently. In birds, reptiles, and terrestrial snails, metabolic ammonium is converted into uric acid, which is solid and can therefore be excreted with minimal water loss. Beyond Earth Ammonia has been detected in the atmospheres of the giant planets, including Jupiter, along with other gases such as methane, hydrogen, and helium. The interior of Saturn may include frozen ammonia crystals. It is found on Deimos and Phobos – the two moons of Mars. Interstellar space Ammonia was first detected in interstellar space in 1968, based on microwave emissions from the direction of the galactic core. This was the first polyatomic molecule to be so detected. The sensitivity of the molecule to a broad range of excitations and the ease with which it can be observed in a number of regions has made ammonia one of the most important molecules for studies of molecular clouds. The relative intensity of the ammonia lines can be used to measure the temperature of the emitting medium. The following isotopic species of ammonia have been detected: NH3, 15NH3, NH2D, NHD2, and ND3 The detection of triply deuterated ammonia was considered a surprise as deuterium is relatively scarce. It is thought that the low-temperature conditions allow this molecule to survive and accumulate. Since its interstellar discovery, NH3 has proved to be an invaluable spectroscopic tool in the study of the interstellar medium. With a large number of transitions sensitive to a wide range of excitation conditions, NH3 has been widely astronomically detected – its detection has been reported in hundreds of journal articles. Listed below is a sample of journal articles that highlights the range of detectors that have been used to identify ammonia. The study of interstellar ammonia has been important to a number of areas of research in the last few decades. Some of these are delineated below and primarily involve using ammonia as an interstellar thermometer. Interstellar formation mechanisms The interstellar abundance for ammonia has been measured for a variety of environments. The [NH3]/[H2] ratio has been estimated to range from 10−7 in small dark clouds up to 10−5 in the dense core of the Orion Molecular Cloud Complex. Although a total of 18 total production routes have been proposed, the principal formation mechanism for interstellar NH3 is the reaction: NH4+ + e− → NH3 + H· The rate constant, k, of this reaction depends on the temperature of the environment, with a value of 5.2×10−6 at 10 K. The rate constant was calculated from the formula . For the primary formation reaction, and . Assuming an NH4+ abundance of 3×10−7 and an electron abundance of 10−7 typical of molecular clouds, the formation will proceed at a rate of in a molecular cloud of total density . All other proposed formation reactions have rate constants of between 2 and 13 orders of magnitude smaller, making their contribution to the abundance of ammonia relatively insignificant. As an example of the minor contribution other formation reactions play, the reaction: H2 + NH2 → NH3 + H has a rate constant of 2.2. Assuming H2 densities of 105 and [NH2]/[H2] ratio of 10−7, this reaction proceeds at a rate of 2.2, more than 3 orders of magnitude slower than the primary reaction above. Some of the other possible formation reactions are: H− + NH4+ → NH3 + H2 PNH3+ + e− → P + NH3

by irradiation of trivalent iron (Fe3+) for silicon in the structure, in the presence of trace elements of large ionic radius, and to a certain extent, the amethyst color can naturally result from displacement of transition elements even if the iron concentration is low. Natural amethyst is dichroic in reddish violet and bluish violet, but when heated, turns yellow-orange, yellow-brown, or dark brownish and may resemble citrine, but loses its dichroism, unlike genuine citrine. When partially heated, amethyst can result in ametrine. Amethyst can fade in tone if overexposed to light sources and can be artificially darkened with adequate irradiation. It does not fluoresce under either short-wave or long-wave UV light. Geographic distribution Amethyst is found in many locations around the world. Between 2000 and 2010, the greatest production was from Marabá and Pau d'Arco, Pará, and the Paraná Basin, Rio Grande do Sul, Brazil; Sandoval, Santa Cruz, Bolivia; Artigas, Uruguay; Kalomo, Zambia; and Thunder Bay, Ontario. Lesser amounts are found in many other locations in Africa, Brazil, Spain, Argentina, Russia, Afghanistan, South Korea, Mexico, and the United States. Amethyst is produced in abundance from the state of Rio Grande do Sul in Brazil where it occurs in large geodes within volcanic rocks. Many of the hollow agates of southwestern Brazil and Uruguay contain a crop of amethyst crystals in the interior. Artigas, Uruguay and neighboring Brazilian state Rio Grande do Sul are large world producers, with lesser quantities mined in Minas Gerais and Bahia states. Amethyst is also found and mined in South Korea. The large opencast amethyst vein at Maissau, Lower Austria, was historically important, but is no longer included among significant producers. Much fine amethyst comes from Russia, especially from near Mursinka in the Ekaterinburg district, where it occurs in drusy cavities in granitic rocks. Amethyst was historically mined in many localities in south India, though these are no longer significant producers. One of the largest global amethyst producers is Zambia in southern Africa with an annual production of about 1000 tons. Amethyst occurs at many localities in the United States. The most important production is at Four Peaks, Gila and Maricopa Counties, Arizona, and Jackson's Crossroads, Wilkes County, Georgia. Smaller occurrences have been reported in the Red Feather Lakes, near Fort Collins, Colorado; Amethyst Mountain, Texas; Yellowstone National Park; Delaware County, Pennsylvania; Haywood County, North Carolina; Deer Hill and Stow, Maine and in the Lake Superior region of Minnesota, Wisconsin and Michigan. Amethyst is relatively common in the Canadian provinces of Ontario and Nova Scotia. The largest amethyst mine in North America is located in Thunder Bay, Ontario. Amethyst is the official state gemstone of South Carolina. Several South Carolina amethysts are on display at the Smithsonian Museum of Natural History. History Amethyst was used as a gemstone by the ancient Egyptians and was largely employed in antiquity for intaglio engraved gems. The Greeks believed amethyst gems could prevent intoxication, while medieval European soldiers wore amethyst amulets as protection in battle in the belief that amethysts heal people and keep them cool-headed. Beads of amethyst were found in Anglo-Saxon graves in England. Anglican bishops wear an episcopal ring often set with an amethyst, an allusion to the description of the Apostles as "not drunk" at Pentecost in Acts 2:15. A large geode, or "amethyst-grotto", from near Santa Cruz in southern Brazil was presented at a 1902 exhibition in Düsseldorf, Germany. The meaning of amethyst varies from time to time and culture, which is why amethyst has different meanings in Feng Shui and focuses on increasing wealth. In ancient China, it was also used as a powerful tool to remove negative energies and drive away the hazards of daily life. Synthetic amethyst Synthetic (laboratory-grown) amethyst is produced by a synthesis method called hydrothermal growth, which grows the crystals inside a high-pressure autoclave. Synthetic amethyst is made to imitate the best quality amethyst. Its chemical and physical properties are the same as that of natural amethyst and it can not be differentiated with absolute certainty without advanced gemmological testing (which is often cost-prohibitive).

in some cases other transition metals, and the presence of other trace elements, which result in complex crystal lattice substitutions. The hardness of the mineral is the same as quartz, thus making it suitable for use in jewelry. Hue and tone Amethyst occurs in primary hues from a light lavender or pale violet, to a deep purple. Amethyst may exhibit one or both secondary hues, red and blue. High quality amethyst can be found in Siberia, Sri Lanka, Brazil, Uruguay, and the Far East. The ideal grade is called "Deep Siberian" and has a primary purple hue of around 75–80%, with 15–20% blue and (depending on the light source) red secondary hues. ‘Rose de France’ is defined by its markedly light shade of the purple, reminiscent of a lavender/lilac shade. These pale colors were once considered undesirable, but have recently become popular due to intensive marketing. Green quartz is sometimes incorrectly called green amethyst, which is a misnomer and not an appropriate name for the material, as the proper terminology is prasiolite. Other names for green quartz are vermarine or lime citrine. Amethyst frequently shows color zoning, with the most intense color typically found at the crystal terminations. It is the most prized variety of quartz. One of a gem cutter’s tasks is to make a finished product with even color. Sometimes, only a thin layer of a natural, uncut amethyst is violet colored, or the color is very uneven. The uncut gem may have only a small portion that is suitable for faceting. The color of amethyst has been demonstrated to result from substitution by irradiation of trivalent iron (Fe3+) for silicon in the structure, in the presence of trace elements of large ionic radius, and to a certain extent, the amethyst color can naturally result from displacement of transition elements even if the iron concentration is low. Natural amethyst is dichroic in reddish violet and bluish violet, but when heated, turns yellow-orange, yellow-brown, or dark brownish and may resemble citrine, but loses its dichroism, unlike genuine citrine. When partially heated, amethyst can result in ametrine. Amethyst can fade in tone if overexposed to light sources and can be artificially darkened with adequate irradiation. It does not fluoresce under either short-wave or long-wave UV light. Geographic distribution Amethyst is found in many locations around the world. Between 2000 and 2010, the greatest production was from Marabá and Pau d'Arco, Pará, and the Paraná Basin, Rio Grande do Sul, Brazil; Sandoval, Santa Cruz, Bolivia; Artigas, Uruguay; Kalomo, Zambia; and Thunder Bay, Ontario. Lesser amounts are found in many other locations in Africa, Brazil, Spain, Argentina, Russia, Afghanistan, South Korea, Mexico, and the United States. Amethyst is produced in abundance from the state of Rio Grande do Sul in Brazil where it occurs in large geodes within volcanic rocks. Many of the hollow agates of southwestern Brazil and Uruguay contain a crop of amethyst crystals in the interior. Artigas, Uruguay and neighboring Brazilian state Rio Grande do Sul are large world producers, with lesser quantities mined in Minas Gerais and Bahia states. Amethyst is also found and mined in South Korea. The large opencast amethyst vein at Maissau, Lower Austria, was historically important, but is no longer included among significant producers. Much fine amethyst comes from Russia, especially from near Mursinka in the Ekaterinburg district, where it occurs in drusy cavities in granitic rocks. Amethyst was historically mined in many localities in south India, though these are no longer significant producers. One of the largest global amethyst producers is Zambia in southern Africa with an annual production of about 1000 tons. Amethyst occurs at many localities in the United States. The most important production is at Four Peaks, Gila and Maricopa Counties, Arizona, and Jackson's Crossroads, Wilkes County, Georgia. Smaller occurrences have been reported in the Red Feather Lakes, near Fort Collins, Colorado; Amethyst Mountain, Texas; Yellowstone National Park; Delaware County, Pennsylvania; Haywood County, North Carolina; Deer Hill

J. Currie of the Royal Tyrrell Museum of Palaeontology rediscovered the bonebed in 1997 and resumed fieldwork at the site, which is now located inside Dry Island Buffalo Jump Provincial Park. Further excavation from 1997 to 2005 turned up the remains of 13 more individuals of various ages, including a diminutive two-year-old and a very old individual estimated at over in length. None of these individuals are known from complete skeletons, and most are represented by remains in both museums. Excavations continued until 2008, when the minimum number of individuals present had been established at 12, on the basis of preserved elements that occur only once in a skeleton, and at 26 if mirrored elements were counted when differing in size due to ontogeny. A total of 1,128 Albertosaurus bones had been secured, the largest concentration of large theropod fossils known from the Cretaceous. Other discoveries In 1911, Barnum Brown, during the second year of American Museum of Natural History operations in Alberta, uncovered a fragmentary partial Albertosaurus skull at the Red Deer River near Tolman Bridge, specimen AMNH 5222. William Parks described a new species in 1928, Albertosaurus arctunguis, based on a partial skeleton lacking the skull excavated by Gus Lindblad and Ralph Hornell near the Red Deer River in 1923, but this species has been considered identical to A. sarcophagus since 1970. Parks' specimen (ROM 807) is housed in the Royal Ontario Museum in Toronto. Between 1926 and 1972, no Albertosaurus fossils were found at all; but, since the seventies, there has been a steady increase in the known material. Apart from the Dry Island bonebed, six more skulls and skeletons have since been discovered in Alberta and are housed in various Canadian museums: specimens RTMP 81.010.001, found in 1978 by amateur paleontologist Maurice Stefanuk; RTMP 85.098.001, found by Stefanuk on 16 June 1985; RTMP 86.64.001 (December 1985); RTMP 86.205.001 (1986); RTMP 97.058.0001 (1996); and CMN 11315. However, due to vandalism and accidents, no undamaged and complete skulls could be secured among these finds. Fossils have also been reported from the American states of Montana, New Mexico, Wyoming, and Missouri, but these probably do not represent A. sarcophagus and may not even belong to the genus Albertosaurus. Two specimens from ("cf Albertosaurus ".sp") have been found in Mexico (Packard Formation and Corral de Enmedio Formation). Gorgosaurus libratus In 1913, paleontologist Charles H. Sternberg recovered another tyrannosaurid skeleton from the slightly older Dinosaur Park Formation in Alberta. Lawrence Lambe named this dinosaur Gorgosaurus libratus in 1914. Other specimens were later found in Alberta and the US state of Montana. Finding, largely due to a lack of good Albertosaurus skull material, no significant differences to separate the two taxa, Dale Russell declared the name Gorgosaurus a junior synonym of Albertosaurus, which had been named first, and G. libratus was renamed Albertosaurus libratus in 1970. A species distinction was maintained because of the age difference. This addition extended the temporal range of the genus Albertosaurus backwards by several million years and its geographic range southwards by hundreds of kilometres. In 2003, Philip J. Currie, benefiting from much more extensive finds and a general increase in anatomical knowledge of theropods, compared several tyrannosaurid skulls and came to the conclusion that the two species are more distinct than previously thought. The decision to use one or two genera is rather arbitrary, as the two species are sister taxa, more closely related to each other than to any other species. Recognizing this, Currie nevertheless recommended that Albertosaurus and Gorgosaurus be retained as separate genera, as he concluded that they were no more similar than Daspletosaurus and Tyrannosaurus, which are almost always separated. In addition, several albertosaurine specimens have been recovered from Alaska and New Mexico, and Currie suggested that the Albertosaurus-Gorgosaurus situation may be clarified once these are described fully. Most authors have followed Currie's recommendation, but some have not. Other species Apart from A. sarcophagus, A. arctunguis and A. libratus, several other species of Albertosaurus have been named. All of these are today seen as younger synonyms of other species or as nomina dubia, and are not assigned to Albertosaurus. In 1930, Anatoly Nikolaevich Riabinin named Albertosaurus pericolosus based on a tooth from China, that probably belonged to Tarbosaurus. In 1932, Friedrich von Huene renamed Dryptosaurus incrassatus, not considered a nomen dubium by him, to Albertosaurus incrassatus. Because he had identified Gorgosaurus with Albertosaurus, in 1970, Russell also renamed Gorgosaurus sternbergi (Matthew & Brown 1922) into Albertosaurus sternbergi and Gorgosaurus lancensis (Gilmore 1946) into Albertosaurus lancensis. The former species is today seen as a juvenile form of Gorgosaurus libratus, the latter as either identical to Tyrannosaurus or representing a separate genus Nanotyrannus. In 1988, Gregory S. Paul based Albertosaurus megagracilis on a small tyrannosaurid skeleton, specimen LACM 28345, from the Hell Creek Formation of Montana. It was renamed Dinotyrannus in 1995, but is now thought to represent a juvenile Tyrannosaurus rex. Also in 1988, Paul renamed Alectrosaurus olseni (Gilmore 1933) into Albertosaurus olseni; this has found no general acceptance. In 1989, Gorgosaurus novojilovi (Maleev 1955) was renamed by Bryn Mader and Robert Bradley as Albertosaurus novojilovi; today this is seen as a synonym of Tarbosaurus. On two occasions, species based on valid Albertosaurus material were reassigned to a different genus: in 1922 William Diller Matthew renamed A. sarcophagus into Deinodon sarcophagus and in 1939 German paleontologist Oskar Kuhn renamed A. arctunguis into Deinodon arctunguis. Description Albertosaurus was a large bipedal predator but smaller than Tarbosaurus and Tyrannosaurus rex. Typical Albertosaurus adults measured up to long, while rare individuals of great age could grow to be over long. Several independent mass estimates, obtained by different methods, suggest that an adult Albertosaurus weighed between . In 2016, Molina-Pérez and Larramendi estimated the largest specimen (CMN 5600) at 9.6 meters (31 ft) and 4 tonnes (4.4 short tons). Albertosaurus shared a similar body appearance with all other tyrannosaurids. Typically for a theropod, Albertosaurus was bipedal and balanced the heavy head and torso with a long tail. However, tyrannosaurid forelimbs were extremely small for their body size and retained only two digits. The hind limbs were long and ended in a four-toed foot on which the first digit, called the hallux, was short and did not reach the ground. The third digit was longer than the rest. Albertosaurus may have been able to reach walking speeds of 14–21 km/hour (8–13 mi/hour). At least for the younger individuals, a high running speed is plausible. Two skin impressions from Albertosaurus are known, both showing scales. One patch is found with some gastralic ribs and the impression of a long, unknown bone, indicating that the patch is from the belly. The scales are pebbly and gradually become larger and somewhat hexagonal in shape. Also preserved are two larger feature scales, placed 4.5 cm apart from each other. Another skin impression is from an unknown part of the body. These scales are small, diamond-shaped and arranged in rows. Skull and teeth The massive skull of Albertosaurus, which was perched on a short, S-shaped neck, was about long in the largest adults. Wide openings in the skull (fenestrae) reduced the weight of the head while also providing space for muscle attachment and sensory organs. Its long jaws contained, both sides combined, 58 or more banana-shaped teeth; larger tyrannosaurids possessed fewer teeth; Gorgosaurus had more at 62. Unlike most theropods, Albertosaurus and other tyrannosaurids were heterodont, with teeth of different forms depending on their position in the mouth. The premaxillary teeth at the tip of the upper jaw, four per side, were much smaller than the rest, more closely packed, and D-shaped in cross section. Like with Tyrannosaurus, the maxillary (cheek) teeth of Albertosaurus were adapted in general form to resist lateral forces exerted by a struggling prey. The bite force of Albertosaurus was less formidable, however, with the maximum force, by the hind teeth, reaching 3,413 Newtons. Above the eyes were short bony crests that may have been brightly coloured in life and used in courtship to attract a mate. William Abler observed in 2001 that Albertosaurus tooth serrations resemble a crack in the tooth ending in a round void called an ampulla. Tyrannosaurid teeth were used as holdfasts for pulling flesh off a body, so when a tyrannosaur pulled back on a piece of meat, the tension could cause a purely crack-like serration to spread through the tooth. However, the presence of the ampulla distributed these forces over a larger surface area, and lessened the risk

Albertosaurus backwards by several million years and its geographic range southwards by hundreds of kilometres. In 2003, Philip J. Currie, benefiting from much more extensive finds and a general increase in anatomical knowledge of theropods, compared several tyrannosaurid skulls and came to the conclusion that the two species are more distinct than previously thought. The decision to use one or two genera is rather arbitrary, as the two species are sister taxa, more closely related to each other than to any other species. Recognizing this, Currie nevertheless recommended that Albertosaurus and Gorgosaurus be retained as separate genera, as he concluded that they were no more similar than Daspletosaurus and Tyrannosaurus, which are almost always separated. In addition, several albertosaurine specimens have been recovered from Alaska and New Mexico, and Currie suggested that the Albertosaurus-Gorgosaurus situation may be clarified once these are described fully. Most authors have followed Currie's recommendation, but some have not. Other species Apart from A. sarcophagus, A. arctunguis and A. libratus, several other species of Albertosaurus have been named. All of these are today seen as younger synonyms of other species or as nomina dubia, and are not assigned to Albertosaurus. In 1930, Anatoly Nikolaevich Riabinin named Albertosaurus pericolosus based on a tooth from China, that probably belonged to Tarbosaurus. In 1932, Friedrich von Huene renamed Dryptosaurus incrassatus, not considered a nomen dubium by him, to Albertosaurus incrassatus. Because he had identified Gorgosaurus with Albertosaurus, in 1970, Russell also renamed Gorgosaurus sternbergi (Matthew & Brown 1922) into Albertosaurus sternbergi and Gorgosaurus lancensis (Gilmore 1946) into Albertosaurus lancensis. The former species is today seen as a juvenile form of Gorgosaurus libratus, the latter as either identical to Tyrannosaurus or representing a separate genus Nanotyrannus. In 1988, Gregory S. Paul based Albertosaurus megagracilis on a small tyrannosaurid skeleton, specimen LACM 28345, from the Hell Creek Formation of Montana. It was renamed Dinotyrannus in 1995, but is now thought to represent a juvenile Tyrannosaurus rex. Also in 1988, Paul renamed Alectrosaurus olseni (Gilmore 1933) into Albertosaurus olseni; this has found no general acceptance. In 1989, Gorgosaurus novojilovi (Maleev 1955) was renamed by Bryn Mader and Robert Bradley as Albertosaurus novojilovi; today this is seen as a synonym of Tarbosaurus. On two occasions, species based on valid Albertosaurus material were reassigned to a different genus: in 1922 William Diller Matthew renamed A. sarcophagus into Deinodon sarcophagus and in 1939 German paleontologist Oskar Kuhn renamed A. arctunguis into Deinodon arctunguis. Description Albertosaurus was a large bipedal predator but smaller than Tarbosaurus and Tyrannosaurus rex. Typical Albertosaurus adults measured up to long, while rare individuals of great age could grow to be over long. Several independent mass estimates, obtained by different methods, suggest that an adult Albertosaurus weighed between . In 2016, Molina-Pérez and Larramendi estimated the largest specimen (CMN 5600) at 9.6 meters (31 ft) and 4 tonnes (4.4 short tons). Albertosaurus shared a similar body appearance with all other tyrannosaurids. Typically for a theropod, Albertosaurus was bipedal and balanced the heavy head and torso with a long tail. However, tyrannosaurid forelimbs were extremely small for their body size and retained only two digits. The hind limbs were long and ended in a four-toed foot on which the first digit, called the hallux, was short and did not reach the ground. The third digit was longer than the rest. Albertosaurus may have been able to reach walking speeds of 14–21 km/hour (8–13 mi/hour). At least for the younger individuals, a high running speed is plausible. Two skin impressions from Albertosaurus are known, both showing scales. One patch is found with some gastralic ribs and the impression of a long, unknown bone, indicating that the patch is from the belly. The scales are pebbly and gradually become larger and somewhat hexagonal in shape. Also preserved are two larger feature scales, placed 4.5 cm apart from each other. Another skin impression is from an unknown part of the body. These scales are small, diamond-shaped and arranged in rows. Skull and teeth The massive skull of Albertosaurus, which was perched on a short, S-shaped neck, was about long in the largest adults. Wide openings in the skull (fenestrae) reduced the weight of the head while also providing space for muscle attachment and sensory organs. Its long jaws contained, both sides combined, 58 or more banana-shaped teeth; larger tyrannosaurids possessed fewer teeth; Gorgosaurus had more at 62. Unlike most theropods, Albertosaurus and other tyrannosaurids were heterodont, with teeth of different forms depending on their position in the mouth. The premaxillary teeth at the tip of the upper jaw, four per side, were much smaller than the rest, more closely packed, and D-shaped in cross section. Like with Tyrannosaurus, the maxillary (cheek) teeth of Albertosaurus were adapted in general form to resist lateral forces exerted by a struggling prey. The bite force of Albertosaurus was less formidable, however, with the maximum force, by the hind teeth, reaching 3,413 Newtons. Above the eyes were short bony crests that may have been brightly coloured in life and used in courtship to attract a mate. William Abler observed in 2001 that Albertosaurus tooth serrations resemble a crack in the tooth ending in a round void called an ampulla. Tyrannosaurid teeth were used as holdfasts for pulling flesh off a body, so when a tyrannosaur pulled back on a piece of meat, the tension could cause a purely crack-like serration to spread through the tooth. However, the presence of the ampulla distributed these forces over a larger surface area, and lessened the risk of damage to the tooth under strain. The presence of incisions ending in voids has parallels in human engineering. Guitar makers use incisions ending in voids to, as Abler describes, "impart alternating regions of flexibility and rigidity" to wood they work. The use of a drill to create an "ampulla" of sorts and prevent the propagation of cracks through material is also used to protect aircraft surfaces. Abler demonstrated that a plexiglass bar with incisions called "kerfs" and drilled holes was more than 25% stronger than one with only regularly placed incisions. Unlike tyrannosaurs, ancient predators like phytosaurs and Dimetrodon had no adaptations to prevent the crack-like serrations of their teeth from spreading when subjected to the forces of feeding. Classification and systematics Albertosaurus is a member of the theropod family Tyrannosauridae, in the subfamily Albertosaurinae. Its closest relative is the slightly older Gorgosaurus libratus (sometimes called Albertosaurus libratus; see below). These two species are the only described albertosaurines; other undescribed species may exist. Thomas Holtz found Appalachiosaurus to be an albertosaurine in 2004, but his more recent unpublished work locates it just outside Tyrannosauridae, in agreement with other authors. The other major subfamily of tyrannosaurids is the Tyrannosaurinae, which includes Daspletosaurus, Tarbosaurus and Tyrannosaurus. Compared with these robust tyrannosaurines, albertosaurines had slender builds, with proportionately smaller skulls and longer bones of the lower leg (tibia) and feet (metatarsals and phalanges). Below is the cladogram of the Tyrannosauridae based on the phylogenetic analysis conducted by Loewen et al. in 2013. Palaeobiology Growth pattern Most age categories of Albertosaurus are represented in the fossil record. Using bone histology, the age of an individual animal at the time of death can often be determined, allowing growth rates to be estimated and compared with other species. The youngest known Albertosaurus is a two-year-old discovered in the Dry Island bonebed, which would have weighed about 50 kilograms (110 lb) and measured slightly more than in length. The specimen from the same quarry is the oldest and largest known, at 28 years of age. When specimens of intermediate age and size are plotted on a graph, an S-shaped growth curve results, with the most rapid growth occurring in a four-year period ending around the sixteenth year of life, a pattern also seen in other tyrannosaurids. The growth rate during this phase was per year, based on an adult 1.3 tonnes. Other studies have suggested higher adult weights; this would affect the magnitude of the growth rate, but not the overall pattern. Tyrannosaurids similar in size to Albertosaurus had similar growth rates, although the much larger Tyrannosaurus rex grew at almost five times this rate ( per year) at its peak. The end of the rapid growth phase suggests the onset of sexual maturity in Albertosaurus, although growth continued at a slower rate throughout the animals' lives. Sexual maturation while still actively growing appears to be a shared trait among small and large dinosaurs as well as in large mammals such as humans and elephants. This pattern of relatively early sexual maturation differs strikingly from the pattern in birds, which delay their sexual maturity until after they have finished growing. During growth, through thickening the tooth morphology changed so much that, had the association of young and adult skeletons on the Dry Island bonebed not proven they belonged to the same taxon, the teeth of juveniles would likely have been identified by statistical analysis as those of a different species. Life history Most known Albertosaurus individuals were aged 14 years or more at the time of death. Juvenile animals are rarely found as fossils for several reasons, mainly preservation bias, where the smaller bones of younger animals were less likely to be preserved by fossilization than the larger bones of adults, and collection bias, where smaller fossils are less likely to be noticed by collectors in the field. Young Albertosaurus are relatively large for juvenile animals, but their remains are still rare in the fossil record compared with adults. It has been suggested that this phenomenon is a consequence of life history, rather than bias, and that fossils of juvenile Albertosaurus are rare because they simply did not die as often as adults did. A hypothesis of Albertosaurus life history postulates that hatchlings died in large numbers, but have not been preserved in the fossil record due to their small size and fragile construction. After just two years, juveniles were larger than any other predator in the region aside from adult Albertosaurus, and more fleet of foot than most of their prey animals. This resulted in a dramatic decrease in their mortality rate and a corresponding rarity of fossil remains. Mortality rates doubled at age twelve, perhaps the result of the physiological demands of the rapid growth phase, and then doubled again with the onset of sexual maturity between the ages of fourteen and sixteen. This elevated mortality rate continued throughout adulthood, perhaps due to the high physiological demands of procreation, including stress and injuries received during intraspecific competition for mates and resources, and eventually, the ever-increasing effects of senescence. The higher mortality rate in adults may explain their more common preservation. Very large animals were rare because few individuals survived long enough to attain such sizes. High infant mortality rates, followed by reduced mortality among juveniles and a sudden increase in mortality after sexual maturity, with

one of the better-known examples. There may be several assemblers with different syntax for a particular CPU or instruction set architecture. For instance, an instruction to add memory data to a register in a x86-family processor might be add eax,[ebx], in original Intel syntax, whereas this would be written addl (%ebx),%eax in the AT&T syntax used by the GNU Assembler. Despite different appearances, different syntactic forms generally generate the same numeric machine code. A single assembler may also have different modes in order to support variations in syntactic forms as well as their exact semantic interpretations (such as FASM-syntax, TASM-syntax, ideal mode, etc., in the special case of x86 assembly programming). Number of passes There are two types of assemblers based on how many passes through the source are needed (how many times the assembler reads the source) to produce the object file. One-pass assemblers go through the source code once. Any symbol used before it is defined will require "errata" at the end of the object code (or, at least, no earlier than the point where the symbol is defined) telling the linker or the loader to "go back" and overwrite a placeholder which had been left where the as yet undefined symbol was used. Multi-pass assemblers create a table with all symbols and their values in the first passes, then use the table in later passes to generate code. In both cases, the assembler must be able to determine the size of each instruction on the initial passes in order to calculate the addresses of subsequent symbols. This means that if the size of an operation referring to an operand defined later depends on the type or distance of the operand, the assembler will make a pessimistic estimate when first encountering the operation, and if necessary, pad it with one or more "no-operation" instructions in a later pass or the errata. In an assembler with peephole optimization, addresses may be recalculated between passes to allow replacing pessimistic code with code tailored to the exact distance from the target. The original reason for the use of one-pass assemblers was memory size and speed of assembly – often a second pass would require storing the symbol table in memory (to handle forward references), rewinding and rereading the program source on tape, or rereading a deck of cards or punched paper tape. Later computers with much larger memories (especially disc storage), had the space to perform all necessary processing without such re-reading. The advantage of the multi-pass assembler is that the absence of errata makes the linking process (or the program load if the assembler directly produces executable code) faster. Example: in the following code snippet, a one-pass assembler would be able to determine the address of the backward reference BKWD when assembling statement S2, but would not be able to determine the address of the forward reference FWD when assembling the branch statement S1; indeed, FWD may be undefined. A two-pass assembler would determine both addresses in pass 1, so they would be known when generating code in pass 2. B ... EQU * ... EQU * ... B High-level assemblers More sophisticated high-level assemblers provide language abstractions such as: High-level procedure/function declarations and invocations Advanced control structures (IF/THEN/ELSE, SWITCH) High-level abstract data types, including structures/records, unions, classes, and sets Sophisticated macro processing (although available on ordinary assemblers since the late 1950s for, e.g., the IBM 700 series and IBM 7000 series, and since the 1960s for IBM System/360 (S/360), amongst other machines) Object-oriented programming features such as classes, objects, abstraction, polymorphism, and inheritance See Language design below for more details. Assembly language A program written in assembly language consists of a series of mnemonic processor instructions and meta-statements (known variously as declarative operations, directives, pseudo-instructions, pseudo-operations and pseudo-ops), comments and data. Assembly language instructions usually consist of an opcode mnemonic followed by an operand, which might be a list of data, arguments or parameters. Some instructions may be "implied," which means the data upon which the instruction operates is implicitly defined by the instruction itself—such an instruction does not take an operand. The resulting statement is translated by an assembler into machine language instructions that can be loaded into memory and executed. For example, the instruction below tells an x86/IA-32 processor to move an immediate 8-bit value into a register. The binary code for this instruction is 10110 followed by a 3-bit identifier for which register to use. The identifier for the AL register is 000, so the following machine code loads the AL register with the data 01100001. 10110000 01100001 This binary computer code can be made more human-readable by expressing it in hexadecimal as follows. B0 61 Here, B0 means 'Move a copy of the following value into AL, and 61 is a hexadecimal representation of the value 01100001, which is 97 in decimal. Assembly language for the 8086 family provides the mnemonic MOV (an abbreviation of move) for instructions such as this, so the machine code above can be written as follows in assembly language, complete with an explanatory comment if required, after the semicolon. This is much easier to read and to remember. MOV AL, 61h ; Load AL with 97 decimal (61 hex) In some assembly languages (including this one) the same mnemonic, such as MOV, may be used for a family of related instructions for loading, copying and moving data, whether these are immediate values, values in registers, or memory locations pointed to by values in registers or by immediate (a.k.a direct) addresses. Other assemblers may use separate opcode mnemonics such as L for "move memory to register", ST for "move register to memory", LR for "move register to register", MVI for "move immediate operand to memory", etc. If the same mnemonic is used for different instructions, that means that the mnemonic corresponds to several different binary instruction codes, excluding data (e.g. the 61h in this example), depending on the operands that follow the mnemonic. For example, for the x86/IA-32 CPUs, the Intel assembly language syntax MOV AL, AH represents an instruction that moves the contents of register AH into register AL. The hexadecimal form of this instruction is: 88 E0 The first byte, 88h, identifies a move between a byte-sized register and either another register or memory, and the second byte, E0h, is encoded (with three bit-fields) to specify that both operands are registers, the source is AH, and the destination is AL. In a case like this where the same mnemonic can represent more than one binary instruction, the assembler determines which instruction to generate by examining the operands. In the first example, the operand 61h is a valid hexadecimal numeric constant and is not a valid register name, so only the B0 instruction can be applicable. In the second example, the operand AH is a valid register name and not a valid numeric constant (hexadecimal, decimal, octal, or binary), so only the 88 instruction can be applicable. Assembly languages are always designed so that this sort of unambiguousness is universally enforced by their syntax. For example, in the Intel x86 assembly language, a hexadecimal constant must start with a numeral digit, so that the hexadecimal number 'A' (equal to decimal ten) would be written as 0Ah or 0AH, not AH, specifically so that it cannot appear to be the name of register AH. (The same rule also prevents ambiguity with the names of registers BH, CH, and DH, as well as with any user-defined symbol that ends with the letter H and otherwise contains only characters that are hexadecimal digits, such as the word "BEACH".) Returning to the original example, while the x86 opcode 10110000 (B0) copies an 8-bit value into the AL register, 10110001 (B1) moves it into CL and 10110010 (B2) does so into DL. Assembly language examples for these follow. MOV AL, 1h ; Load AL with immediate value 1 MOV CL, 2h ; Load CL with immediate value 2 MOV DL, 3h ; Load DL with immediate value 3 The syntax of MOV can also be more complex as the following examples show. MOV EAX, [EBX] ; Move the 4 bytes in memory at the address contained in EBX into EAX MOV [ESI+EAX], CL ; Move the contents of CL into the byte at address ESI+EAX MOV DS, DX ; Move the contents of DX into segment register DS In each case, the MOV mnemonic is translated directly into one of the opcodes 88-8C, 8E, A0-A3, B0-BF, C6 or C7 by an assembler, and the programmer normally does not have to know or remember which. Transforming assembly language into machine code is the job of an assembler, and the reverse can at least partially be achieved by a disassembler. Unlike high-level languages, there is a one-to-one correspondence between many simple assembly statements and machine language instructions. However, in some cases, an assembler may provide pseudoinstructions (essentially macros) which expand into several machine language instructions to provide commonly needed functionality. For example, for a machine that lacks a "branch if greater or equal" instruction, an assembler may provide a pseudoinstruction that expands to the machine's "set if less than" and "branch if zero (on the result of the set instruction)". Most full-featured assemblers also provide a rich macro language (discussed below) which is used by vendors and programmers to generate more complex code and data sequences. Since the information about pseudoinstructions and macros defined in the assembler environment is not present in the object program, a disassembler cannot reconstruct the macro and pseudoinstruction invocations but can only disassemble the actual machine instructions that the assembler generated from those abstract assembly-language entities. Likewise, since comments in the assembly language source file are ignored by the assembler and have no effect on the object code it generates, a disassembler is always completely unable to recover source comments. Each computer architecture has its own machine language. Computers differ in the number and type of operations they support, in the different sizes and numbers of registers, and in the representations of data in storage. While most general-purpose computers are able to carry out essentially the same functionality, the ways they do so differ; the corresponding assembly languages reflect these differences. Multiple sets of mnemonics or assembly-language syntax may exist for a single instruction set, typically instantiated in different assembler programs. In these cases, the most popular one is usually that supplied by the CPU manufacturer and used in its documentation. Two examples of CPUs that have two different sets of mnemonics are the Intel 8080 family and the Intel 8086/8088. Because Intel claimed copyright on its assembly language mnemonics (on each page of their documentation published in the 1970s and early 1980s, at least), some companies that independently produced CPUs compatible with Intel instruction sets invented their own mnemonics. The Zilog Z80 CPU, an enhancement of the Intel 8080A, supports all the 8080A instructions plus many more; Zilog invented an entirely new assembly language, not only for the new instructions but also for all of the 8080A instructions. For example, where Intel uses the mnemonics MOV, MVI, LDA, STA, LXI, LDAX, STAX, LHLD, and SHLD for various data transfer instructions, the Z80 assembly language uses the mnemonic LD for all of them. A similar case is the NEC V20 and V30 CPUs, enhanced copies of the Intel 8086 and 8088, respectively. Like Zilog with the Z80, NEC invented new mnemonics for all of the 8086 and 8088 instructions, to avoid accusations of infringement of Intel's copyright. (It is questionable whether such copyrights can be valid, and later CPU companies such as AMD and Cyrix republished Intel's x86/IA-32 instruction mnemonics exactly with neither permission nor legal penalty.) It is doubtful whether in practice many people who programmed the V20 and V30 actually wrote in NEC's assembly language rather than Intel's; since any two assembly languages for the same instruction set architecture are isomorphic (somewhat like English and Pig Latin), there is no requirement to use a manufacturer's own published assembly language with that manufacturer's products. Language design Basic elements There is a large degree of diversity in the way the authors of assemblers categorize statements and in the nomenclature that they use. In particular, some describe anything other than a machine mnemonic or extended mnemonic as a pseudo-operation (pseudo-op). A typical assembly language consists of 3 types of instruction statements that are used to define program operations: Opcode mnemonics Data definitions Assembly directives Opcode mnemonics and extended mnemonics Instructions (statements) in assembly language are generally very simple, unlike those in high-level languages. Generally, a mnemonic is a symbolic name for a single executable machine language instruction (an opcode), and there is at least one opcode mnemonic defined for each machine language instruction. Each instruction typically consists of an operation or opcode plus zero or more operands. Most instructions refer to a single value or a pair of values. Operands can be immediate (value coded in the instruction itself), registers specified in the instruction or implied, or the addresses of data located elsewhere in storage. This is determined by the underlying processor architecture: the assembler merely reflects how this architecture works. Extended mnemonics are often used to specify a combination of an opcode with a specific operand, e.g., the System/360 assemblers use as an extended mnemonic for with a mask of 15 and ("NO OPeration" – do nothing for one step) for with a mask of 0. Extended mnemonics are often used to support specialized uses of instructions, often for purposes not obvious from the instruction name. For example, many CPU's do not have an explicit NOP instruction, but do have instructions that can be used for the purpose. In 8086 CPUs the instruction is used for , with being a pseudo-opcode to

operands in order to form a complete instruction. Most assemblers permit named constants, registers, and labels for program and memory locations, and can calculate expressions for operands. Thus, programmers are freed from tedious repetitive calculations and assembler programs are much more readable than machine code. Depending on the architecture, these elements may also be combined for specific instructions or addressing modes using offsets or other data as well as fixed addresses. Many assemblers offer additional mechanisms to facilitate program development, to control the assembly process, and to aid debugging. Some are column oriented, with specific fields in specific columns; this was very common for machines using punched cards in the 1950s and early 1960s. Some assemblers have free-form syntax, with fields separated by delimiters, e.g., punctuation, white space. Some assemblers are hybrid, with, e.g., labels, in a specific column and other fields separated by delimiters; this became more common than column oriented syntax in the 1960s. IBM System/360 All of the IBM assemblers for System/360, by default, have a label in column 1, fields separated by delimiters in columns 2-71, a continuation indicator in column 72 and a sequence number in columns 73-80. The delimiter for label, opcode, operands and comments is spaces, while individual operands are separated by commas and parentheses. Terminology A macro assembler is an assembler that includes a macroinstruction facility so that (parameterized) assembly language text can be represented by a name, and that name can be used to insert the expanded text into other code. Open code refers to any assembler input outside of a macro definition. A cross assembler (see also cross compiler) is an assembler that is run on a computer or operating system (the host system) of a different type from the system on which the resulting code is to run (the target system). Cross-assembling facilitates the development of programs for systems that do not have the resources to support software development, such as an embedded system or a microcontroller. In such a case, the resulting object code must be transferred to the target system, via read-only memory (ROM, EPROM, etc.), a programmer (when the read-only memory is integrated in the device, as in microcontrollers), or a data link using either an exact bit-by-bit copy of the object code or a text-based representation of that code (such as Intel hex or Motorola S-record). A high-level assembler is a program that provides language abstractions more often associated with high-level languages, such as advanced control structures (IF/THEN/ELSE, DO CASE, etc.) and high-level abstract data types, including structures/records, unions, classes, and sets. A microassembler is a program that helps prepare a microprogram, called firmware, to control the low level operation of a computer. A meta-assembler is "a program that accepts the syntactic and semantic description of an assembly language, and generates an assembler for that language", or that accepts an assembler source file along with such a description and assembles the source file in accordance with that description. "Meta-Symbol" assemblers for the SDS 9 Series and SDS Sigma series of computers are meta-assemblers. Sperry Univac also provided a Meta-Assembler for the UNIVAC 1100/2200 series. inline assembler (or embedded assembler) is assembler code contained within a high-level language program. This is most often used in systems programs which need direct access to the hardware. Key concepts Assembler An assembler program creates object code by translating combinations of mnemonics and syntax for operations and addressing modes into their numerical equivalents. This representation typically includes an operation code ("opcode") as well as other control bits and data. The assembler also calculates constant expressions and resolves symbolic names for memory locations and other entities. The use of symbolic references is a key feature of assemblers, saving tedious calculations and manual address updates after program modifications. Most assemblers also include macro facilities for performing textual substitution – e.g., to generate common short sequences of instructions as inline, instead of called subroutines. Some assemblers may also be able to perform some simple types of instruction set-specific optimizations. One concrete example of this may be the ubiquitous x86 assemblers from various vendors. Called jump-sizing, most of them are able to perform jump-instruction replacements (long jumps replaced by short or relative jumps) in any number of passes, on request. Others may even do simple rearrangement or insertion of instructions, such as some assemblers for RISC architectures that can help optimize a sensible instruction scheduling to exploit the CPU pipeline as efficiently as possible. Assemblers have been available since the 1950s, as the first step above machine language and before high-level programming languages such as Fortran, Algol, COBOL and Lisp. There have also been several classes of translators and semi-automatic code generators with properties similar to both assembly and high-level languages, with Speedcode as perhaps one of the better-known examples. There may be several assemblers with different syntax for a particular CPU or instruction set architecture. For instance, an instruction to add memory data to a register in a x86-family processor might be add eax,[ebx], in original Intel syntax, whereas this would be written addl (%ebx),%eax in the AT&T syntax used by the GNU Assembler. Despite different appearances, different syntactic forms generally generate the same numeric machine code. A single assembler may also have different modes in order to support variations in syntactic forms as well as their exact semantic interpretations (such as FASM-syntax, TASM-syntax, ideal mode, etc., in the special case of x86 assembly programming). Number of passes There are two types of assemblers based on how many passes through the source are needed (how many times the assembler reads the source) to produce the object file. One-pass assemblers go through the source code once. Any symbol used before it is defined will require "errata" at the end of the object code (or, at least, no earlier than the point where the symbol is defined) telling the linker or the loader to "go back" and overwrite a placeholder which had been left where the as yet undefined symbol was used. Multi-pass assemblers create a table with all symbols and their values in the first passes, then use the table in later passes to generate code. In both cases, the assembler must be able to determine the size of each instruction on the initial passes in order to calculate the addresses of subsequent symbols. This means that if the size of an operation referring to an operand defined later depends on the type or distance of the operand, the assembler will make a pessimistic estimate when first encountering the operation, and if necessary, pad it with one or more "no-operation" instructions in a later pass or the errata. In an assembler with peephole optimization, addresses may be recalculated between passes to allow replacing pessimistic code with code tailored to the exact distance from the target. The original reason for the use of one-pass assemblers was memory size and speed of assembly – often a second pass would require storing the symbol table in memory (to handle forward references), rewinding and rereading the program source on tape, or rereading a deck of cards or punched paper tape. Later computers with much larger memories (especially disc storage), had the space to perform all necessary processing without such re-reading. The advantage of the multi-pass assembler is that the absence of errata makes the linking process (or the program load if the assembler directly produces executable code) faster. Example: in the following code snippet, a one-pass assembler would be able to determine the address of the backward reference BKWD when assembling statement S2, but would not be able to determine the address of the forward reference FWD when assembling the branch statement S1; indeed, FWD may be undefined. A two-pass assembler would determine both addresses in pass 1, so they would be known when generating code in pass 2. B ... EQU * ... EQU * ... B High-level assemblers More sophisticated high-level assemblers provide language abstractions such as: High-level procedure/function declarations and invocations Advanced control structures (IF/THEN/ELSE, SWITCH) High-level abstract data types, including structures/records, unions, classes, and sets Sophisticated macro processing (although available on ordinary assemblers since the late 1950s for, e.g., the IBM 700 series and IBM 7000 series, and since the 1960s for IBM System/360 (S/360), amongst other machines) Object-oriented programming features such as classes, objects, abstraction, polymorphism, and inheritance See Language design below for more details. Assembly language A program written in assembly language consists of a series of mnemonic processor instructions and meta-statements (known variously as declarative operations, directives, pseudo-instructions, pseudo-operations and pseudo-ops), comments and data. Assembly language instructions usually consist of an opcode mnemonic followed by an operand, which might be a list of data, arguments or parameters. Some instructions may be "implied," which means the data upon which the instruction operates is implicitly defined by the instruction itself—such an instruction does not take an operand. The resulting statement is translated by an assembler into machine language instructions that can be loaded into memory and executed. For example, the instruction below tells an x86/IA-32 processor to move an immediate 8-bit value into a register. The binary code for this instruction is 10110 followed by a 3-bit identifier for which register to use. The identifier for the AL register is 000, so the following machine code loads the AL register with the data 01100001. 10110000 01100001 This binary computer code can be made more human-readable by expressing it in hexadecimal as follows. B0 61 Here, B0 means 'Move a copy of the following value into AL, and 61 is a hexadecimal representation of the value 01100001, which is 97 in decimal. Assembly language for the 8086 family provides the mnemonic MOV (an abbreviation of move) for instructions such as this, so the machine code above can be written as follows in assembly language, complete with an explanatory comment if required, after the semicolon. This is much easier to read and to remember. MOV AL, 61h ; Load AL with 97 decimal (61 hex) In some assembly languages (including this one) the same mnemonic, such as MOV, may be used for a family of related instructions for loading, copying and moving data, whether these are immediate values, values in registers, or memory locations pointed to by values in registers or by immediate (a.k.a direct) addresses. Other assemblers may use separate opcode mnemonics such as L for "move memory to register", ST for "move register to memory", LR for "move register to register", MVI for "move immediate operand to memory", etc. If the same mnemonic is used for different instructions, that means that the mnemonic corresponds to several different binary instruction codes, excluding data (e.g. the 61h in this example), depending on the operands that follow the mnemonic. For example, for the x86/IA-32 CPUs, the Intel assembly language syntax MOV AL, AH represents an instruction that moves the contents of register AH into register AL. The hexadecimal form of this instruction is: 88 E0 The first byte, 88h, identifies a move between a byte-sized register and either another register or memory, and the second byte, E0h, is encoded (with three bit-fields) to specify that both operands are registers, the source is AH, and the destination is AL. In a case like this where the same mnemonic can represent more than one binary instruction, the assembler determines which instruction to generate by examining the operands. In the first example, the operand 61h is a valid hexadecimal numeric constant and is not a valid register name, so only the B0 instruction can be applicable. In the second example, the operand AH is a valid register name and not a valid numeric constant (hexadecimal, decimal, octal, or binary), so only the 88 instruction can be applicable. Assembly languages are always designed so that this sort of unambiguousness is universally enforced by their syntax. For example, in the Intel x86 assembly language, a hexadecimal constant must start with a numeral digit, so that the hexadecimal number 'A' (equal to decimal ten) would be written as 0Ah or 0AH, not AH, specifically so that it cannot appear to be the name of register AH. (The same rule also prevents ambiguity with the names of registers BH, CH, and DH, as well as with any user-defined symbol that ends with the letter H and otherwise contains only characters that are hexadecimal digits, such as the word "BEACH".) Returning to the original example, while the x86 opcode 10110000 (B0) copies an 8-bit value into the AL register, 10110001 (B1) moves it into CL and 10110010 (B2) does so into DL. Assembly language examples for these follow. MOV AL, 1h ; Load AL with immediate value 1 MOV CL, 2h ; Load CL with immediate value 2 MOV DL, 3h ; Load DL with immediate value 3 The syntax of MOV can also be more complex as the following examples show. MOV EAX, [EBX] ; Move the 4 bytes in memory at the address contained in EBX into EAX MOV [ESI+EAX], CL ; Move the contents of CL into the byte at address ESI+EAX MOV DS, DX ; Move the contents of DX into segment register DS In each case, the MOV mnemonic is translated directly into one of the opcodes 88-8C, 8E, A0-A3, B0-BF, C6 or C7 by an assembler, and the programmer normally does not have to know or remember which. Transforming assembly language into machine code is the job of an assembler, and the reverse can at least partially be achieved by a disassembler. Unlike high-level languages, there is a one-to-one correspondence between many simple assembly statements and machine language instructions. However, in some cases, an assembler may provide pseudoinstructions (essentially macros) which expand into several machine language instructions to provide commonly needed functionality. For example, for a machine that lacks a "branch if greater or equal" instruction, an assembler may provide a pseudoinstruction that expands to the machine's "set if less than" and "branch if zero (on the result of the set instruction)". Most full-featured assemblers also provide a rich macro language (discussed below) which is used by vendors and programmers to generate more complex code and data sequences. Since the information about pseudoinstructions and macros defined in the assembler environment is not present in the object program, a disassembler cannot reconstruct the macro and pseudoinstruction invocations but can only disassemble the actual machine instructions that the assembler generated from those abstract assembly-language entities. Likewise, since comments in the assembly language source file are ignored by the assembler and have no effect on the object code it generates, a disassembler is always completely unable to recover source comments. Each computer architecture has

us; she brought ambrosia and put it under our nostrils." Homer speaks of ambrosial raiment, ambrosial locks of hair, even the gods' ambrosial sandals. Among later writers, ambrosia has been so often used with generic meanings of "delightful liquid" that such late writers as Athenaeus, Paulus and Dioscurides employ it as a technical terms in contexts of cookery, medicine, and botany. Pliny used the term in connection with different plants, as did early herbalists. Additionally, some modern ethnomycologists, such as Danny Staples, identify ambrosia with the hallucinogenic mushroom Amanita muscaria: "...it was the food of the gods, their ambrosia, and nectar was the pressed sap of its juices", Staples asserts. W. H. Roscher thinks that both nectar and ambrosia were kinds of honey, in which case their power of conferring immortality would be due to the supposed healing and cleansing powers of honey, and because fermented honey (mead) preceded wine as an entheogen in the Aegean world; on some Minoan seals, goddesses were represented with bee faces (compare Merope and Melissa). Etymology The concept of an immortality drink is attested in at least two ancient Indo-European languages: Greek and Sanskrit. The Greek ἀμβροσία (ambrosia) is semantically linked to the Sanskrit (amṛta) as both words denote a drink or food that gods use to achieve immortality. The two words appear to be derived from the same Indo-European form *ṇ-mṛ-tós, "un-dying" (n-: negative prefix from which the prefix a- in both Greek and Sanskrit are derived; mṛ: zero grade of *mer-, "to die"; and -to-: adjectival suffix). A semantically similar etymology exists for nectar, the beverage of the gods (Greek: νέκταρ néktar) presumed to be a compound of the PIE roots *nek-, "death", and -*tar, "overcoming". Other examples in mythology In one version of the story of the birth of Achilles, Thetis anoints the infant with ambrosia and passes the child through the fire to make him immortal but Peleus, appalled, stops her, leaving only his heel unimmortalised (Argonautica 4.869–879). In the Iliad xvi, Apollo washes the black blood from the corpse of Sarpedon and anoints it with ambrosia, readying it for its dreamlike return to Sarpedon's native Lycia. Similarly, Thetis anoints the corpse of Patroclus in order to preserve it. Ambrosia and nectar are depicted as unguents (xiv. 170; xix. 38). In the Odyssey, Calypso is described as having "spread a table with ambrosia and set it by Hermes, and mixed the rosy-red nectar." It is ambiguous whether he means the ambrosia itself

with passion at the sight of her. On the other hand, in Alcman, nectar is the food, and in Sappho and Anaxandrides, ambrosia is the drink. A character in Aristophanes' Knights says, "I dreamed the goddess poured ambrosia over your head—out of a ladle." Both descriptions could be correct, as ambrosia could be a liquid considered a food (such as honey). The consumption of ambrosia was typically reserved for divine beings. Upon his assumption into immortality on Olympus, Heracles is given ambrosia by Athena, while the hero Tydeus is denied the same thing when the goddess discovers him eating human brains. In one version of the myth of Tantalus, part of Tantalus' crime is that after tasting ambrosia himself, he attempts to steal some to give to other mortals. Those who consume ambrosia typically have ichor, not blood, in their veins. Both nectar and ambrosia are fragrant, and may be used as perfume: in the Odyssey Menelaus and his men are disguised as seals in untanned seal skins, "...and the deadly smell of the seal skins vexed us sore; but the goddess saved us; she brought ambrosia and put it under our nostrils." Homer speaks of ambrosial raiment, ambrosial locks of hair, even the gods' ambrosial sandals. Among later writers, ambrosia has been so often used with generic meanings of "delightful liquid" that such late writers as Athenaeus, Paulus and Dioscurides employ it as a technical terms in contexts of cookery, medicine, and botany. Pliny used the term in connection with different plants, as did early herbalists. Additionally, some modern ethnomycologists, such as Danny Staples, identify ambrosia with the hallucinogenic mushroom Amanita muscaria: "...it was the food of the gods, their ambrosia, and nectar was the pressed sap of its juices", Staples asserts. W. H. Roscher thinks that both nectar and ambrosia were kinds of honey, in which case their power of conferring immortality would be due to the supposed healing and cleansing powers of honey, and because fermented honey (mead) preceded wine as an entheogen in the Aegean world; on some Minoan seals, goddesses were represented with bee faces (compare Merope and Melissa). Etymology The

martyr and create a scandal for the emperor. Ambrose, referring to a prior incident where Magnus Maximus issued an edict censuring Christians in Rome for burning down a Jewish synagogue, warned Theodosius that the people in turn exclaimed "the emperor has become a Jew", implying Theodosius would receive the same lack of support from the people. Theodosius rescinded the order concerning the bishop. That was not enough for Ambrose, and when Theodosius next visited Milan, Ambrose confronted him directly in an effort to get the emperor to drop the entire case. McLynn argues that Ambrose failed to win the emperor's sympathy and was mostly excluded from his counsels thereafter. The Callinicum affair was not an isolated incident. Generally speaking, Ambrose presents a strong anti-Jewish polemic. While McLynn says this makes Ambrose look like a bully and a bigot to modern eyes, scholars also agree Ambrose' attitudes toward the Jews cannot be fairly summarized in one sentence, as not all of Ambrose' attitudes toward Jews were negative. Ambrose makes extensive and appreciative use of the works of Philo of Alexandria - a Jew - in Ambrose' own writings, treating Philo as one of the "faithful interpreters of the Scriptures". Philo was an educated man of some standing and a prolific writer during the era of Second Temple Judaism. Forty–three of his treatises have been preserved, and these by Christians, rather than Jews. Philo became foundational in forming the Christian literary view on the six days of creation through Basil's Hexaemeron. Eusebius, the Cappadocian Fathers, and Didymus the Blind appropriated material from Philo as well, but none did so more than Ambrose. As a result of this extensive referencing, Philo was accepted into the Christian tradition as an honorary Church Father. "In fact, one Byzantine catena even refers to him as 'Bishop Philo'. This high regard for Philo even led to a number of legends of his conversion to Christianity, although this assertion stands on very dubious evidence". Ambrose also used Josephus, Maccabees, and other Jewish sources for his writings. He praises some individual Jews. Ambrose tended to write negatively of all non-Nicenes as if they were all one category. This served a rhetorical purpose in his writing and should be considered accordingly. Attitude towards pagans Modern scholarship indicates paganism was a lesser concern than heresy for Christians in the fourth and fifth centuries, which was the case for Ambrose, but it was still a concern. Writings of this period were commonly hostile and often contemptuous toward a paganism Christianity saw as already defeated in heaven. The great Christian writers of the third to fifth centuries attempted to discredit continuation in these "defeated practices" by searching pagan writings, "particularly those of Varro, for everything that could be regarded by Christian standards as repulsive and irreligious." Ambrose' work reflects this triumphalism.{{efn|These Christian sources have had great influence on perceptions of this period by creating an impression of overt and continuous conflict that has been assumed on an empire-wide scale, while archaeological evidence indicates that, outside of violent rhetoric, the decline of paganism away from the imperial court was relatively non-confrontational. {{sfnm|Trombley|2001|1loc=Vol I|1pp=166-168|Trombley|2001|2loc=Vol II|2pp=335-336}}}} Throughout his time in the episcopate, Ambrose was active in his opposition to any state sponsorship of pagan cults. When Gratian ordered the Altar of Victory to be removed, it roused the aristocracy of Rome to send a delegation to the emperor to appeal the decision, but Pope Damasus I got the Christian senators to petition against it, and Ambrose blocked the delegates from getting an audience with the emperor. Under Valentinian II, an effort was made to restore the Altar of Victory to its ancient station in the hall of the Roman Senate and to again provide support for the seven Vestal Virgins. The pagan party was led by the refined senator Quintus Aurelius Symmachus, who used all his prodigious skill and artistry to create a marvelous document full of the maiestas populi Romani. Hans Lietzmann writes that "Pagans and Christians alike were stirred by the solemn earnestness of an admonition which called all men of goodwill to the aid of a glorious history, to render all worthy honor to a world that was fading away". Then Ambrose wrote Valentinian II a letter asserting that the emperor was a soldier of God, not simply a personal believer but one bound by his position to serve the faith; under no circumstances could he agree to something that would promote the worship of idols. Ambrose held up the example of Valentinian's brother, Gratian, reminding Valentinian that the commandment of God must take precedence. The bishop's intervention led to the failure of Symmachus' appeal. In 389, Ambrose intervened against a pagan senatorial delegation who wished to see the emperor Theodosius I. Although Theodosius refused their requests, he was irritated at the bishop's presumption and refused to see him for several days. Later, Ambrose wrote a letter to the emperor Eugenius complaining that some gifts the latter had bestowed on pagan senators could be used for funding pagan cults. Theology Ambrose joins Augustine, Jerome, and Gregory the Great as one of the Latin Doctors of the Church. Theologians compare him with Hilary, who they claim fell short of Ambrose's administrative excellence but demonstrated greater theological ability. He succeeded as a theologian despite his juridical training and his comparatively late handling of Biblical and doctrinal subjects. Ambrose's intense episcopal consciousness furthered the growing doctrine of the Church and its sacerdotal ministry, while the prevalent asceticism of the day, continuing the Stoic and Ciceronian training of his youth, enabled him to promulgate a lofty standard of Christian ethics. Thus we have the De officiis ministrorum, De viduis, De virginitate and De paenitentia. Ambrose displayed a kind of liturgical flexibility that kept in mind that liturgy was a tool to serve people in worshiping God, and ought not to become a rigid entity that is invariable from place to place. His advice to Augustine of Hippo on this point was to follow local liturgical custom. "When I am at Rome, I fast on a Saturday; when I am at Milan, I do not. Follow the custom of the church where you are." Thus Ambrose refused to be drawn into a false conflict over which particular local church had the "right" liturgical form where there was no substantial problem. His advice has remained in the English language as the saying, "When in Rome, do as the Romans do." One interpretation of Ambrose's writings is that he was a Christian universalist. It has been noted that Ambrose's theology was significantly influenced by that of Origen and Didymus the Blind, two other early Christian universalists. One quotation cited in favor of this belief is: One could interpret this passage as being another example of the mainstream Christian belief in a general resurrection (that both those in heaven and in hell undergo a bodily resurrection), or an allusion to purgatory (that some destined for heaven must first undergo a phase of purification). Several other works by Ambrose clearly teach the mainstream view of salvation. For example: "The Jews feared to believe in manhood taken up into God, and therefore have lost the grace of redemption, because they reject that on which salvation depends." Giving to the poor In De Officiis, the most influential of his surviving works, and one of the most important texts of patristic literature, he reveals his views connecting justice and generosity by asserting these practices are of mutual benefit to the participants. Ambrose draws heavily on Cicero and the biblical book of Genesis for this concept of mutual inter-dependence in society. In the bishop's view, it is concern for one another's interests that binds society together. Ambrose asserts that avarice leads to a breakdown in this mutuality, therefore avarice leads to a breakdown in society itself. In the late 380s, the bishop took the lead in opposing the greed of the elite landowners in Milan by starting a series of pointed sermons directed at his wealthy constituents on the need for the rich to care for the poor. Some scholars have suggested Ambrose' endeavors to lead his people as both a Roman and a Christian caused him to strive for what a modern context would describe as a type of communism or socialism. He was not just interested in the church but was also interested in the condition of contemporary Italian society. Ambrose considered the poor not a distinct group of outsiders, but a part of a united people to be stood with in solidarity. Giving to the poor was not to be considered an act of generosity towards the fringes of society but a repayment of resources that God had originally bestowed on everyone equally and that the rich had usurped. He defines justice as providing for the poor whom he describes as our "brothers and sisters" because they "share our common humanity". Mariology The theological treatises of Ambrose of Milan would come to influence Popes Damasus, Siricius and Leo XIII. Central to Ambrose is the virginity of Mary and her role as Mother of God. The virgin birth is worthy of God. Which human birth would have been more worthy of God, than the one in which the Immaculate Son of God maintained the purity of his immaculate origin while becoming human? We confess that Christ the Lord was born from a virgin, and therefore we reject the natural order of things. Because she conceived not from a man but from the Holy Spirit. Christ is not divided but one. If we adore him as the Son of God, we do not deny his birth from the virgin. ... But nobody shall extend this to Mary. Mary was the temple of God but not God in the temple. Therefore, only the one who was in the temple can be worshiped. Yes, truly blessed for having surpassed the priest (Zechariah). While the priest denied, the Virgin rectified the error. No wonder that the Lord, wishing to rescue the world, began his work with Mary. Thus she, through whom salvation was being prepared for all people, would be the first to receive the promised fruit of salvation. Ambrose viewed celibacy as superior to marriage and saw Mary as the model of virginity. Augustine Ambrose studied theology with Simplician, a presbyter of Rome. Using his excellent knowledge of Greek, which was then rare in the West, Ambrose studied the Old Testament and Greek authors like Philo, Origen, Athanasius, and Basil of Caesarea, with whom he was also exchanging letters. Ambrose became a famous rhetorician whom Augustine came to hear speak. Augustine wrote in his Confessions that Faustus, the Manichean rhetorician, was a more impressive speaker, but the content of Ambrose's sermons began to affect Augustine's faith. Augustine sought guidance from Ambrose, and again records in his Confessions that Ambrose was too busy to answer his questions. In a passage of Augustine's Confessions in which Augustine wonders why he could not share his burden with Ambrose, he comments: "Ambrose himself I esteemed a happy man, as the world counted happiness, because great personages held him in honor. Only his celibacy appeared to me a painful burden." Simplician regularly met with Augustine, however, and Augustine writes of Simplician's "fatherly affection" for him. It was Simplician who introduced Augustine to Christian Neoplatonism. It is commonly understood in the Christian Tradition that Ambrose baptized Augustine. In this same passage of Augustine's Confessions is an anecdote which bears on the history of reading: This is a celebrated passage in modern scholarly discussion. The practice of reading to oneself without vocalizing the text was less common in antiquity than it has since become. In a culture that set a high value on oratory and public performances of all kinds, in which the production of books was very labor-intensive, the majority of the population was illiterate, and where those with the leisure to enjoy literary works also had slaves to read for them, written texts were more likely to be seen as scripts for recitation than as vehicles of silent reflection. However, there is also evidence that silent reading did occur in antiquity and that it was not generally regarded as unusual. Music Ambrose's writings extend past literature and into music, where he was an important innovator in early Christian hymnography. His contributions include the "successful invention of Christian Latin hymnody", while the hymnologist Guido Maria Dreves designated him to be "The Father of church hymnody". He was not the first to write Latin hymns; the Bishop Hilary of Poitiers had done so a few decades before. However, the hymns of Hilary are thought to have been largely inaccessible by-way of their complexity and length. Only fragments of hymns from Hilary's Liber hymnorum exist, making those of Ambrose the earliest extant complete Latin hymns. The assembling of Ambrose's surviving oeuvre remains controversial; the almost immediate popularity of his style quickly prompted imitations, some which may even date from his lifetime. There are four hymns for which Ambrose's authorship is universally accepted, as they are attributed to him by Augustine: "Aeterne rerum conditor" "Deus creator omnium" "Iam surgit hora tertia" "Veni redemptor gentium" (also known as "Intende qui regis Israel") Each of these hymns has 8 four-line stanzas and is written in strict iambic tetrameter (that is 4 × 2 syllables, each iamb being two syllables). Marked by dignified simplicity, they served as a fruitful model for later times. Scholars such as the theologian Brian P. Dunkle have argued for the authenticity of as many as thirteen other hymns, while the musicologist James McKinnon contends that further attributions could include "perhaps some ten others". Ambrose is traditionally credited but not actually known to have composed any of the repertory of Ambrosian chant also known simply as "antiphonal chant", a method of chanting where one side of the choir alternately responds to the other. (The later pope Gregory I the Great is not known to have composed any Gregorian chant, the plainsong or "Romish chant".) However, Ambrosian chant was named in his honor due to his contributions to the music of the Church; he is credited with introducing hymnody from the Eastern Church into the West. With Augustine, Ambrose was traditionally credited with composing the hymn "Te Deum". Since the hymnologist Guido Maria Dreves in 1893, however, scholars have dismissed this attribution. Writings Source: All works are originally in Latin. Following each is where it may be found in a standard compilation of Ambrose's writings. His first work was probably De paradiso (377–378). Most have approximate dates, and works such as De Helia et ieiunio (377–391), Expositio evangelii secundum Lucam (377–389) and De officiis ministrorum (377–391) have been given a wide variety of datings by scholars. His best known work is probably De officiis ministrorum (377–391), while the (386–390) and De obitu Theodosii (395) are among his most noted works. In matters of exegesis he is, like Hilary, an Alexandrian. In dogma he follows Basil of Caesarea and other Greek authors, but nevertheless gives a distinctly Western cast to the speculations of which he treats. This is particularly manifest in the weightier emphasis which he lays upon human sin and divine grace, and in the place which he assigns to faith in the individual Christian life. Exegesis (; ; ) (; ; ) (; ; ) (; ) (; ) (; ; ) (; ; ) (; ; ) (; ; ) (; ; ) (; ; ) (; ) () (; ) (; ; ) (; ) (; ) (; ) () (; ; ) Moral and ascetical commentary () () () () () Dogmatic writings (; ) (; ; ) (; ; ) ; ) (; ; ) (; ) () (fragmented; ) Sermons (; ; ) (; ; ) (; ; ) () Others 91 letters Ambrosiaster or the "pseudo-Ambrose" is a brief commentary on Paul's Epistles, which was long attributed to Ambrose. Editions Standard editions Based on an edition published in Paris by Jacques Du Frische and Denis-Nicolas Le Nourry. }} Based on an edition published in Paris by Jacques Du Frische and Denis-Nicolas Le Nourry. Latin Hexameron, De paradiso, De Cain, De Noe, De Abraham, De Isaac, De bono mortis – ed. C. Schenkl 1896, Vol. 32/1 (In Latin) De Iacob, De Ioseph, De patriarchis, De fuga saeculi, De interpellatione Iob et David, De apologia prophetae David, De Helia, De Nabuthae, De

does seem certain is that Ambrose was born in Trier and his father was either the praetorian prefect or part of his administration. There is a legend about Ambrose as an infant contending that a swarm of bees settled on his face while he lay in his cradle, leaving behind a drop of honey. His father is said to have considered this a sign of his future eloquence and honeyed tongue. For this reason, bees and beehives often appear in the saint's symbology. Ambrose' mother was a woman of intellect and piety. It is probable she was a member of the Roman family Aurelii Symmachi, and thus Ambrose was cousin of the orator Quintus Aurelius Symmachus. The family had produced one martyr (the virgin Soteris) in its history. Ambrose was the youngest of three children. His siblings were Satyrus, the subject of Ambrose's De excessu fratris Satyri, and Marcellina, who made a profession of virginity sometime between 352 and 355; Pope Liberius himself conferred the veil upon her. Both Ambrose's siblings also became venerated as saints. Some time early in the life of Ambrose, his father died, and at an unknown later date, his mother fled Trier with her three children, whereupon the family moved to Rome. There Ambrose studied literature, law, and rhetoric. He then followed in his father's footsteps and entered public service. Praetorian Prefect Sextus Claudius Petronius Probus first gave him a place as his council, and then in about 372 made him governor of Liguria and Emilia, with headquarters at Milan. Bishop of Milan In 374 the bishop of Milan, Auxentius, an Arian, died, and the Arians challenged the succession. Ambrose went to the church where the election was to take place to prevent an uproar which was probable in this crisis. His address was interrupted by a call, "Ambrose, bishop!", which was taken up by the whole assembly. Ambrose was known to be Nicene Christian in belief, but he was considered acceptable to Arians due to the charity he had shown in theological matters in this regard. At first he energetically refused the office, for which he felt he was in no way prepared: Ambrose was a relatively new Christian who was not yet baptized nor formally trained in theology. Ambrose fled to a colleague's home seeking to hide. Upon receiving a letter from the Emperor Gratian praising the appropriateness of Rome appointing individuals worthy of holy positions, Ambrose's host gave him up. Within a week, he was baptized, ordained and duly consecrated as the next bishop of Milan. This was the first time in the West that a member of the upper class of high officials had accepted the office of bishop. As bishop, he immediately adopted an ascetic lifestyle, apportioned his money to the poor, donating all of his land, making only provision for his sister Marcellina. This raised his popularity even further; it was his popularity with the people that gave him considerable political leverage throughout his career. Upon the unexpected appointment of Ambrose to the episcopate, his brother Satyrus resigned a prefecture in order to move to Milan, where he took over managing the diocese's temporal affairs. Arianism Arius was a Christian priest who asserted (around the year 300) that God the Father must have created the Son, making the Son a lesser being who was not eternal and of a different "essence" than God the Father was. This Christology was contrary to tradition, yet it quickly spread through Egypt and Libya and the other Roman provinces. Bishops engaged in "wordy warfare," and the people divided into parties, sometimes demonstrating in the streets in support of one side or the other. Arianism appealed to many high level leaders and clergy in both the Western and Eastern empires. Although the western Emperor Gratian supported orthodoxy, the younger Valentinian II, who became his colleague in the Empire, adhered to the Arian creed. Ambrose sought to theologically refute Arian propositions, but Ambrose did not sway the young prince's position. In the East, Emperor Theodosius I likewise professed the Nicene creed; but there were many adherents of Arianism throughout his dominions, especially among the higher clergy. In this state of religious ferment, two leaders of the Arians, bishops Palladius of Ratiaria and Secundianus of Singidunum, confident of numbers, prevailed upon Gratian to call a general council from all parts of the empire. This request appeared so equitable that he complied without hesitation. However, Ambrose feared the consequences and prevailed upon the emperor to have the matter determined by a council of the Western bishops. Accordingly, a synod composed of thirty-two bishops was held at Aquileia in the year 381. Ambrose was elected president and Palladius, being called upon to defend his opinions, declined. A vote was then taken and Palladius and his associate Secundianus were deposed from their episcopal offices. Ambrose struggled with Arianism for over half of his life in the episcopate. Unifying the church was important to the church, but it was no less important to the state, and as a Roman, Ambrose felt strongly about that. Judaism was more attractive for those seeking conversion than previous scholars have realized, and pagans were still in the majority, so the edition of heresy created an age of religious ferment comparable to the Reformation of the fourteenth and fifteenth centuries. Orthodox Christianity was determining how to define itself as it faced multiple challenges on both a theological and a practical level, and Ambrose is seen as a crucial influence at a crucial time. Imperial relations Ambrose had good relations and varying levels of influence with the Roman emperors Gratian, Valentinian II and Theodosius I, but exactly how much influence, what kind of influence, and in what ways, when, has been debated in the scholarship of the late twentieth and early twenty-first centuries. Gratian It has long been convention to see Gratian and Ambrose as having a personal friendship, putting Ambrose in the dominant role of spiritual guide, but modern scholars now find this view hard to support in the sources. The ancient Christian historian Sozomen is the only ancient source that shows Ambrose and Gratian together in any personal interaction. In that interaction, Sozomen relates that, in the last year of Gratian's reign, Ambrose crashed Gratian's private hunting party in order to appeal on behalf of a pagan senator sentenced to die. After years of acquaintance, this indicates Ambrose could not take for granted that Gratian would see him, so instead, Ambrose had to resort to such maneuverings to make his appeal. Gratian was personally devout long before meeting Ambrose. Modern scholarship indicates Gratian's religious policies do not evidence capitulation to Ambrose more than they evidence Gratian's own views. Gratian's devotion did lead Ambrose to write a large number of books and letters of theology and spiritual commentary dedicated to the emperor. The sheer volume of these writings and the effusive praise they contain has led many historians to conclude that Gratian was dominated by Ambrose, and it was that dominance that produced Gratian's anti-pagan actions. McLynn asserts that effusive praises were common in everyone's correspondence with the crown. He adds that Gratian's actions were determined by the constraints of the system as much as "by his own initiatives or Ambrose's influence". McLynn asserts that the largest influence on Gratian's policy was the profound change in political circumstances produced by the battle of Adrianople in 378. Gratian had become involved in fighting the Goths the previous year and had been on his way to the Balkans when his Uncle and the "cream of the eastern army" were destroyed at Adrianople. Gratian withdrew to Sirmium and set up his court there. Several rival groups, including the Arians, sought to secure benefits from the government at Sirmium. In an Arian attempt to undermine Ambrose, whom Gratian had not yet met, Gratian was 'warned' that Ambrose' faith was suspect. Gratian took steps to investigate by writing Ambrose and asking him to explain his faith. Ambrose and Gratian first met, after this, in 379 during a visit to Milan. The bishop made a good impression on Gratian and his court which was pervasively Christian and aristocratic much like Ambrose himself. The emperor returned to Milan in 380 to find that Ambrose had complied with his request for a statement of his faith – in two volumes – known as De Fide: a statement of orthodoxy, Ambrose' political theology, and a polemic against the Arian heresy intended for public discussion. The emperor had not asked to be instructed by Ambrose, and in De Fide Ambrose states this clearly. Nor was he asked to refute the Arians. He was asked to justify his own position, but in the end, he did all three. By 382, it seems clear that Ambrose had replaced Ausonius to become a major influence in Gratian's court. Ambrose had not yet become the "conscience" of kings he would in the later 380's, but he did speak out against reinstating the Altar of Victory. In 382, Gratian was the first to divert public financial subsidies that had previously supported Rome's cults. Before that year, contributions in support of the ancient customs had continued unchallenged by the state. Valentinian II Gratian, who was childless, had treated his younger brother Valentinian II like a son. Ambrose, on the other hand, had incurred the lasting enmity of Valentinian II's mother, the Empress Justina, in the winter of 379 by helping to appoint a Nicene bishop in Sirmium. Not long after this, Valentinian II, his mother, and the court left Sirmium; Sirmium had come under Theodosius' control, so they went to Milan which was ruled by Gratian. In 383 Gratian was assassinated at Lyon, in Gaul (France) by Magnus Maximus. Valentinian was twelve years old, and it left his mother, Justina, in a position of something akin to a regent. In 385 (or 386) the emperor Valentinian II and his mother Justina, along with a considerable number of clergy, the laity, and the military, professed Arianism. Conflict between Ambrose and Justina soon followed. The Arians demanded that Valentinian allocate to them two churches in Milan: one in the city (the Basilica of the Apostles), the other in the suburbs (St Victor's). Ambrose refused to surrender the churches. He answered by saying that "What belongs to God, is outside the emperor's power". In this, Ambrose called on an ancient Roman principle: a temple set apart to a god became the property of that god. Ambrose now applied this ancient legal principle to the Christian churches, and the bishop, as his representative, was guardian of his god's property. Subsequently, while Ambrose was performing the Liturgy of the Hours in the basilica, the prefect of the city came to persuade him to give it up the to the Arians. Ambrose again refused. Certain deans (officers of the court) were sent to take possession of the basilica by hanging upon it imperial escutcheons. Instead, soldiers from the ranks the emperor had placed around the basilica began pouring into the church assuring Ambrose of their fidelity. The escutcheons outside the church were removed, and legend says the children tore them to shreds. Ambrose refused to surrender the basilica, and sent sharp answers back to his emperor: "If you demand my person, I am ready to submit: carry me to prison or to death, I will not resist; but I will never betray the church of Christ. I will not call upon the people to succour me; I will die at the foot of the altar rather than desert it. The tumult of the people I will not encourage: but God alone can appease it." By Thursday, the emperor gave in, bitterly responding: "Soon, if Ambrose gives the orders, you will be sending me to him in chains." In 386, Justina and Valentinian II received the Arian bishop Auxentius the younger, and Ambrose was again ordered to hand over a church in Milan for Arian usage. Ambrose and his congregation barricaded themselves inside the church, and again the imperial order was rescinded. There was an attempted kidnapping, and another attempt to arrest him and force him to leave the city. Several accusations were made, but unlike John Chrysostum, no formal charges were brought. The emperor certainly had the power to do so, and probably didn't solely because of Ambrose' popularity with the people and what they might do. When Magnus Maximus usurped power in Gaul, and was considering a descent upon Italy, Valentinian sent Ambrose to dissuade him, and the embassy was successful. A second later embassy was unsuccessful. The enemy entered Italy and Milan was taken. Justina and her son fled, but Ambrose remained, and had the plate of the church melted for the relief of the poor. After defeating the usurper Maximus at Aquileia in 388 Theodosius handed the western realm back to the young Valentinian II, the seventeen-year-old son of the forceful and hardy Pannonian general Valentinian I and his wife, the Arian Justina. Furthermore, the Eastern emperor remained in Italy for a considerable period to supervise affairs, returning to Constantinople in 391 and leaving behind the Frankish general Arbogast to keep an eye on the young emperor. By May of the following year Arbogast's ward was dead amidst rumours of both treachery and suicide... Theodosius While Ambrose was writing De Fide, Theodosius published his own statement of faith in 381 in an edict establishing Catholic Christianity as the only legitimate faith. There is unanimity amongst scholars that this represents the emperor's own beliefs. The aftermath of Valen's death had left many questions for the church unresolved, and this edict can be seen as an effort to begin addressing those questions. Theodosius' natural generosity was tempered by his pressing need to establish himself and to publicly assert his personal piety. On 28 February 380, Theodosius issued the Edict of Thessalonica, a decree addressed to the city of Constantinople, determining that only Christians who did not support Arian views were catholic and could have their places of worship officially recognized as "churches". Liebeschuetz and Hill indicate that it wasn't until after 388, during Theodosius' stay in Milan following the defeat of Maximus, that Theodosius and Ambrose first met. After the Massacre of Thessalonica in 390, Theodosius made an act of public penance at Ambrose behest. Ambrose was away from court during the events at Thessalonica, but after being informed of them, he wrote Theodosius a letter. In that still existing letter, Ambrose presses for a semi-public demonstration of penitence from the emperor, telling him that, as his bishop, he will not give Theodosius communion until it is done. Wolf Liebeschuetz says "Theodosius duly complied and came to church without his imperial robes, until Christmas, when Ambrose openly admitted him to communion". Some past scholars have credited Ambrose with having an undue influence over the Emperor Theodosius I, from this period forward, prompting him toward major anti-pagan legislation beginning in February of 391. However, this interpretation has been heavily disputed since the late twentieth century. McLynn argues that Theodosius's anti-pagan legislation was too limited in scope for it to be of interest to the bishop. The fabled encounter at the door of the cathedral in Milan, with Ambrose as the mitred prelate braced, blocking Theodosius from entering, which has sometimes been seen as evidence of Ambrose' dominance over Theodosius, has been shown by modern historians to be "a pious fiction". There was no encounter at the church door. The story is a product of the imagination of Theodoret, a historian of the fifth century who wrote of the events of 390 "using his own ideology to fill the gaps in the historical record". The twenty-first century view is that Ambrose was "not a power behind the throne". The two men did not meet each other frequently, and documents that reveal the relationship between the two are less about personal friendship than they are about negotiations between two formidable leaders of the powerful institutions they represent: the Roman State and the Italian Church. Cameron says there's no evidence Ambrose was a significant influence on the emperor. For centuries after his death, Theodosius was regarded as a champion of Christian orthodoxy who decisively stamped out paganism. This view was recorded by Theodoret, who is recognized as an undependable historian, in the century following their deaths. Theodosius's predecessors Constantine, Constantius, and Valens had all been semi-Arians. Therefore, it fell to the orthodox Theodosius to receive from Christian literary tradition most of the credit for the final triumph of Christianity. Modern scholars see this as an interpretation of history by Christian writers more than as a representation of actual history. The view of a pious Theodosius submitting meekly to the authority of the church, represented by Ambrose, is part of the myth that evolved within a generation of their deaths. Later years and death In April 393 Arbogast, magister militum of the West and his puppet Emperor Eugenius, marched into Italy to consolidate their position in regard to Theodosius I and his son, Honorius, whom Theodosius had appointed Augustus to govern the western portion of the empire. Arbogast and Eugenius courted Ambrose's support by very obliging letters; but before they arrived at Milan, he had retired to Bologna, where he assisted at the translation of the relics of Saints Vitalis and Agricola. From there he went to Florence, where he remained until Eugenius withdrew from Milan to meet Theodosius in the Battle of the Frigidus in early September 394. Soon after acquiring the undisputed possession of the Roman Empire, Theodosius died at Milan in 395, and Ambrose gave the eulogy. Two years later (4 April 397) Ambrose also died. He was succeeded as bishop of Milan by Simplician. Ambrose's body may still be viewed in the church of Saint Ambrogio in Milan, where it has been continuously venerated – along with the bodies identified in his time as being those of Saints Gervase and Protase. Ambrose is remembered in the Church of England with a Lesser Festival on 7 December. Character In 1960, Neil B. McLynn wrote a complex study of Ambrose that focused on his politics and intended to "demonstrate that Ambrose viewed community as a means to acquire personal political power". Subsequent studies of how Ambrose handled his episcopal responsibilities, his Nicene theology and his dealings with the Arians in his episcopate, his pastoral care, his commitment to community, and his personal ascetism, have mitigated this view. All of Ambrose' writings are works of advocacy of his religion, and even his political views and actions were closely related to his religion. He was rarely, if ever, concerned about simply recording what had happened; he did not write to reveal his inner thoughts and struggles; he wrote to advocate for his God. Boniface Ramsey writes that it is difficult "not to posit a deep spirituality in a man" who wrote on the mystical meanings of the Song of Songs and many extraordinary hymns. In spite of an abiding spirituality, Ambrose had a generally straightforward manner, and a practical rather than a speculative tendency in his thinking. De Officiis is a utilitarian guide for his clergy in their daily ministry in the Milanese church rather than "an intellectual tour de force". Christian faith in the third century developed the monastic life-style which subsequently spread into

forty-three years of semi-autonomy under Macedonian suzerainty, Ambracia was given by the son of Cassander to Pyrrhus, king of Epirus, who made it his capital, and adorned it with palace, temples and theatres. In the wars of Philip V of Macedon and the Epirotes against the Aetolian League (220–205) Ambracia passed from one alliance to the other, but ultimately joined the latter confederacy. During the struggle of the Aetolians against Rome, it stood a stubborn siege, including the first known use of poison gas against the Romans' siege tunnels. Ambracia was captured and plundered by Marcus Fulvius Nobilior in 189 BC, after which it was declared by Rome a "free city", and gradually fell into insignificance. The foundation by Augustus of Nicopolis, into which the remaining inhabitants were drafted, left the site desolate. In Byzantine times a new settlement took its place under the name of Arta. Some fragmentary walls of large, well-dressed blocks near this latter town indicate the early prosperity of Ambracia. Ambraciotes Artists Epigonus of Ambracia, 6th BC musician Nicocles, auletes Hippasus, tragic actor Epicrates of Ambracia, c. 4th BC comic poet Athletes Sophron, Stadion Olympics 432 BC Tlasimachus, Tethrippon and Synoris Olympics 296 BC Andromachus, Stadion Olympics 60 BC Various Silanus of Ambracia, 5th BC seer Cleombrotus of Ambracia, student of

to accept a Macedonian garrison. In 294 BC, after forty-three years of semi-autonomy under Macedonian suzerainty, Ambracia was given by the son of Cassander to Pyrrhus, king of Epirus, who made it his capital, and adorned it with palace, temples and theatres. In the wars of Philip V of Macedon and the Epirotes against the Aetolian League (220–205) Ambracia passed from one alliance to the other, but ultimately joined the latter confederacy. During the struggle of the Aetolians against Rome, it stood a stubborn siege, including the first known use of poison gas against the Romans' siege tunnels. Ambracia was captured and plundered by Marcus Fulvius Nobilior in 189 BC, after which it was declared by Rome a "free city", and gradually fell into insignificance. The foundation by Augustus of Nicopolis, into which the remaining inhabitants were drafted, left the site desolate. In Byzantine times a new settlement took its place under the name of Arta. Some fragmentary walls of large, well-dressed blocks near this latter town indicate the early prosperity of Ambracia. Ambraciotes Artists Epigonus of Ambracia, 6th BC musician Nicocles, auletes Hippasus, tragic actor Epicrates of Ambracia, c. 4th BC comic poet Athletes Sophron, Stadion Olympics 432 BC Tlasimachus, Tethrippon and Synoris Olympics 296 BC Andromachus, Stadion Olympics 60 BC Various Silanus of Ambracia, 5th BC seer Cleombrotus

Europe (Old French and Middle English ambre). Found along the southern shore of the Baltic Sea, yellow amber reached the Middle East and western Europe via trade. Its coastal acquisition may have been one reason yellow amber came to be designated by the same term as ambergris. Moreover, like ambergris, the resin could be burned as an incense. The resin's most popular use was, however, for ornamentation—easily cut and polished, it could be transformed into beautiful jewelry. Much of the most highly prized amber is transparent, in contrast to the very common cloudy amber and opaque amber. Opaque amber contains numerous minute bubbles. This kind of amber is known as "bony amber". Although all Dominican amber is fluorescent, the rarest Dominican amber is blue amber. It turns blue in natural sunlight and any other partially or wholly ultraviolet light source. In long-wave UV light it has a very strong reflection, almost white. Only about is found per year, which makes it valuable and expensive. Sometimes amber retains the form of drops and stalactites, just as it exuded from the ducts and receptacles of the injured trees. It is thought that, in addition to exuding onto the surface of the tree, amber resin also originally flowed into hollow cavities or cracks within trees, thereby leading to the development of large lumps of amber of irregular form. Classification Amber can be classified into several forms. Most fundamentally, there are two types of plant resin with the potential for fossilization. Terpenoids, produced by conifers and angiosperms, consist of ring structures formed of isoprene (C5H8) units. Phenolic resins are today only produced by angiosperms, and tend to serve functional uses. The extinct medullosans produced a third type of resin, which is often found as amber within their veins. The composition of resins is highly variable; each species produces a unique blend of chemicals which can be identified by the use of pyrolysis–gas chromatography–mass spectrometry. The overall chemical and structural composition is used to divide ambers into five classes. There is also a separate classification of amber gemstones, according to the way of production. Class I This class is by far the most abundant. It comprises labdatriene carboxylic acids such as communic or ozic acids. It is further split into three sub-classes. Classes Ia and Ib utilize regular labdanoid diterpenes (e.g. communic acid, communol, biformenes), while Ic uses enantio labdanoids (ozic acid, ozol, enantio biformenes). Ia Class Ia includes Succinite (= 'normal' Baltic amber) and Glessite. They have a communic acid base, and they also include much succinic acid. Baltic amber yields on dry distillation succinic acid, the proportion varying from about 3% to 8%, and being greatest in the pale opaque or bony varieties. The aromatic and irritating fumes emitted by burning amber are mainly due to this acid. Baltic amber is distinguished by its yield of succinic acid, hence the name succinite. Succinite has a hardness between 2 and 3, which is rather greater than that of many other fossil resins. Its specific gravity varies from 1.05 to 1.10. It can be distinguished from other ambers via IR spectroscopy due to a specific carbonyl absorption peak. IR spectroscopy can detect the relative age of an amber sample. Succinic acid may not be an original component of amber, but rather a degradation product of abietic acid. Ib Like class Ia ambers, these are based on communic acid; however, they lack succinic acid. Ic This class is mainly based on enantio-labdatrienonic acids, such as ozic and zanzibaric acids. Its most familiar representative is Dominican amber. Dominican amber differentiates itself from Baltic amber by being mostly transparent and often containing a higher number of fossil inclusions. This has enabled the detailed reconstruction of the ecosystem of a long-vanished tropical forest. Resin from the extinct species Hymenaea protera is the source of Dominican amber and probably of most amber found in the tropics. It is not "succinite" but "retinite". Class II These ambers are formed from resins with a sesquiterpenoid base, such as cadinene. Class III These ambers are polystyrenes. Class IV Class IV is something of a catch-all: its ambers are not polymerized, but mainly consist of cedrene-based sesquiterpenoids. Class V Class V resins are considered to be produced by a pine or pine relative. They comprise a mixture of diterpinoid resins and n-alkyl compounds. Their main variety is Highgate copalite. Geological record The oldest amber recovered dates to the Upper Carboniferous period (). Its chemical composition makes it difficult to match the amber to its producers – it is most similar to the resins produced by flowering plants; however, there are no flowering plant fossils known from before the Cretaceous, and they were not common until the Late Cretaceous. Amber becomes abundant long after the Carboniferous, in the Early Cretaceous, , when it is found in association with insects. The oldest amber with arthropod inclusions comes from the Late Triassic (late Carnian 230 Ma) of Italy, where four microscopic (0.2–0.1 mm) mites, Triasacarus, Ampezzoa, Minyacarus and Cheirolepidoptus, and a poorly preserved nematoceran fly were found in millimetre-sized droplets of amber. The oldest amber with significant numbers of arthropod inclusions comes from Lebanon. This amber, referred to as Lebanese amber, is roughly 125–135 million years old, is considered of high scientific value, providing evidence of some of the oldest sampled ecosystems. In Lebanon, more than 450 outcrops of Lower Cretaceous amber were discovered by Dany Azar, a Lebanese paleontologist and entomologist. Among these outcrops, 20 have yielded biological inclusions comprising the oldest representatives of several recent families of terrestrial arthropods. Even older, Jurassic amber has been found recently in Lebanon as well. Many remarkable insects and spiders were recently discovered in the amber of Jordan including the oldest zorapterans, clerid beetles, umenocoleid roaches, and achiliid planthoppers. The most important amber from the Cretaceous is the Burmese amber from the Hukawng Valley in northern Myanmar, and is the only commercially exploited Cretaceous amber. Uranium–lead dating of zircon crystals associated with the deposit have given an estimated depositional age of approximately 99 million years ago. Over 1300 species have been described from the amber, with over 300 in 2019 alone. Baltic amber or succinite (historically documented as Prussian amber) is found as irregular nodules in marine glauconitic sand, known as blue earth, occurring in Upper Eocene strata of Sambia in Prussia (in historical sources also referred to as Glaesaria). After 1945, this territory around Königsberg was turned into Kaliningrad Oblast, Russia, where amber is now systematically mined. It appears, however, to have been partly derived from older Eocene deposits and it occurs also as a derivative phase in later formations, such as glacial drift. Relics of an abundant flora occur as inclusions trapped within the amber while the resin was yet fresh, suggesting relations with the flora of Eastern Asia and the southern part of North America. Heinrich Göppert named the common amber-yielding pine of the Baltic forests Pinites succiniter, but as the wood does not seem to differ from that of the existing genus it has been also called Pinus succinifera. It is improbable, however, that the production of amber was limited to a single species; and indeed a large number of conifers belonging to different genera are represented in the amber-flora. Paleontological significance Amber is a unique preservational mode, preserving otherwise unfossilizable parts of organisms; as such it is helpful in the reconstruction of ecosystems as well as organisms; the chemical composition of the resin, however, is of limited utility in reconstructing the phylogenetic affinity of the resin producer. Amber sometimes contains animals or plant matter that became caught in the resin as it was secreted. Insects, spiders and even their webs, annelids, frogs, crustaceans, bacteria and amoebae, marine microfossils, wood, flowers and fruit, hair, feathers and other small organisms have been recovered in Cretaceous ambers (deposited c. ). The preservation of prehistoric organisms in amber forms a key plot point in Michael Crichton's 1990 novel Jurassic Park and the 1993 movie adaptation by Steven Spielberg. In the story, scientists are able to extract the preserved blood of dinosaurs from prehistoric mosquitoes trapped in amber, from which they genetically clone living dinosaurs. Scientifically this is as yet impossible, since no amber with fossilized mosquitoes has ever yielded preserved blood. Amber is, however, conducive to preserving DNA, since it dehydrates and thus stabilizes organisms trapped inside. One projection in 1999 estimated that DNA trapped in amber could last up to 100 million years, far beyond most estimates of around 1 million years in the most ideal conditions, although a later 2013 study was unable to extract DNA from insects trapped in much more recent Holocene copal. In 1938, 12-year-old David Attenborough (brother of Richard who played John Hammond in Jurassic Park) was given a piece of amber containing prehistoric creatures from his adoptive sister; some sixty years later, it would be the focus of his 2004 BBC documentary The Amber Time Machine. Use Amber has been used since prehistory (Solutrean) in the manufacture of jewelry and ornaments, and also in folk medicine. Jewelry Amber has been used as jewelry since the Stone Age, from 13,000 years ago. Amber ornaments have been found in Mycenaean tombs and elsewhere across Europe.<ref>[http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=8456512 Curt W. Beck, Anthony Harding and Helen Hughes-Brock, "Amber in the Mycenaean World" The Annual of the British School at Athens, vol. 69 (November 1974), pp. 145-172. DOI:10.1017/S0068245400005505] </ref> To this day it is used in the manufacture of smoking and glassblowing mouthpieces. Amber's place in culture and tradition lends it a tourism value; Palanga Amber Museum is dedicated to the fossilized resin. Historical medicinal uses Amber has long been used in folk medicine for its purported healing properties. Amber and extracts were used from the time of Hippocrates in ancient Greece for a wide variety of treatments through the Middle Ages and up until the early twentieth century. Traditional Chinese medicine uses amber to "tranquilize the mind". With children Amber necklaces are a traditional European remedy for colic or teething pain due to the purported analgesic properties of succinic acid, although there is no evidence that this is an effective remedy or delivery method. The American Academy of Pediatrics and the FDA have warned strongly against their use, as they present both a choking and a strangulation hazard. Scent of amber and amber perfumery In ancient China, it was customary to burn amber during large festivities. If amber is heated under the right conditions, oil of amber is produced, and in past times this was combined carefully with nitric acid to create "artificial musk" – a resin with a peculiar musky odor. Although when burned, amber does give off a characteristic "pinewood" fragrance, modern products, such as perfume, do not normally use actual amber because fossilized amber produces very little scent. In perfumery, scents referred to as "amber" are often created and patentedPerfume compositions and perfume articles containing one isomer of an octahydrotetramethyl acetonaphthone, John B. Hall, Rumson; James Milton Sanders, Eatontown , Publication Date: 30 December 1975 to emulate the opulent golden warmth of the fossil. The modern name for amber is thought to come from the Arabic word, ambar, meaning ambergris. Ambergris is the waxy aromatic substance created in the intestines of sperm whales and was used in making perfumes both in ancient times as well as modern. The scent of amber was originally derived from emulating the scent of ambergris and/or the plant resin labdanum, but due to the endangered species status of the sperm whale the scent of amber is now largely derived from labdanum. The term "amber" is loosely used to describe a scent that is warm, musky, rich and honey-like, and also somewhat earthy. It can be synthetically created or derived from natural resins. When derived from natural resins it is most often created out of labdanum. Benzoin is usually part of the recipe. Vanilla and cloves are sometimes used to enhance the aroma. "Amber" perfumes may be created using combinations of labdanum, benzoin resin, copal (itself a type of tree resin used in incense manufacture), vanilla, Dammara resin and/or

Pliny says that Pytheas refers to a large island—three days' sail from the Scythian coast and called Balcia by Xenophon of Lampsacus (author of a fanciful travel book in Greek)—as Basilia—a name generally equated with Abalus. Given the presence of amber, the island could have been Heligoland, Zealand, the shores of Bay of Gdańsk, the Sambia Peninsula or the Curonian Lagoon, which were historically the richest sources of amber in northern Europe. It is assumed that there were well-established trade routes for amber connecting the Baltic with the Mediterranean (known as the "Amber Road"). Pliny states explicitly that the Germans exported amber to Pannonia, from where the Veneti distributed it onwards. The ancient Italic peoples of southern Italy used to work amber; the National Archaeological Museum of Siritide (Museo Archeologico Nazionale della Siritide) at Policoro in the province of Matera (Basilicata) displays important surviving examples. Amber used in antiquity, as at Mycenae and in the prehistory of the Mediterranean, comes from deposits in Sicily. Pliny also cites the opinion of Nicias ( 470–413 BCE), according to whom amber Besides the fanciful explanations according to which amber is "produced by the Sun", Pliny cites opinions that are well aware of its origin in tree resin, citing the native Latin name of succinum (sūcinum, from sucus "juice"). In Book 37, section XI of Natural History, Pliny wrote: He also states that amber is also found in Egypt and in India, and he even refers to the electrostatic properties of amber, by saying that "in Syria the women make the whorls of their spindles of this substance, and give it the name of harpax [from ἁρπάζω, "to drag"] from the circumstance that it attracts leaves towards it, chaff, and the light fringe of tissues". Pliny says that the German name of amber was glæsum, "for which reason the Romans, when Germanicus Caesar commanded the fleet in those parts, gave to one of these islands the name of Glæsaria, which by the barbarians was known as Austeravia". This is confirmed by the recorded Old High German word glas and by the Old English word glær for "amber" (compare glass). In Middle Low German, amber was known as berne-, barn-, börnstēn (with etymological roots related to "burn" and to "stone"). The Low German term became dominant also in High German by the 18th century, thus modern German Bernstein besides Dutch barnsteen. In the Baltic languages, the Lithuanian term for amber is gintaras and the Latvian dzintars. These words, and the Slavic jantar and Hungarian gyanta ('resin'), are thought to originate from Phoenician jainitar ("sea-resin"). Amber has a long history of use in China, with the first written record from 200 BCE. Early in the 19th century, the first reports of amber found in North America came from discoveries in New Jersey along Crosswicks Creek near Trenton, at Camden, and near Woodbury. Composition and formation Amber is heterogeneous in composition, but consists of several resinous bodies more or less soluble in alcohol, ether and chloroform, associated with an insoluble bituminous substance. Amber is a macromolecule by free radical polymerization of several precursors in the labdane family, e.g. communic acid, cummunol, and biformene. These labdanes are diterpenes (C20H32) and trienes, equipping the organic skeleton with three alkene groups for polymerization. As amber matures over the years, more polymerization takes place as well as isomerization reactions, crosslinking and cyclization. Heated above , amber decomposes, yielding an oil of amber, and leaves a black residue which is known as "amber colophony", or "amber pitch"; when dissolved in oil of turpentine or in linseed oil this forms "amber varnish" or "amber lac". Formation Molecular polymerization, resulting from high pressures and temperatures produced by overlying sediment, transforms the resin first into copal. Sustained heat and pressure drives off terpenes and results in the formation of amber. For this to happen, the resin must be resistant to decay. Many trees produce resin, but in the majority of cases this deposit is broken down by physical and biological processes. Exposure to sunlight, rain, microorganisms (such as bacteria and fungi), and extreme temperatures tends to disintegrate the resin. For the resin to survive long enough to become amber, it must be resistant to such forces or be produced under conditions that exclude them. Botanical origin Fossil resins from Europe fall into two categories, the famous Baltic ambers and another that resembles the Agathis group. Fossil resins from the Americas and Africa are closely related to the modern genus Hymenaea, while Baltic ambers are thought to be fossil resins from plants of the family Sciadopityaceae that once lived in north Europe. Physical attributes Most amber has a hardness between 2.0 and 2.5 on the Mohs scale, a refractive index of 1.5–1.6, a specific gravity between 1.06 and 1.10, and a melting point of 250–300 °C. Inclusions The abnormal development of resin in living trees (succinosis) can result in the formation of amber. Impurities are quite often present, especially when the resin dropped onto the ground, so the material may be useless except for varnish-making. Such impure amber is called firniss. Such inclusion of other substances can cause the amber to have an unexpected color. Pyrites may give a bluish color. Bony amber owes its cloudy opacity to numerous tiny bubbles inside the resin. However, so-called black amber is really only a kind of jet. In darkly clouded and even opaque amber, inclusions can be imaged using high-energy, high-contrast, high-resolution X-rays. Extraction and processing Distribution and mining Amber is globally distributed, mainly in rocks of Cretaceous age or younger. Historically, the coast west of Königsberg in Prussia was the world's leading source of amber. The first mentions of amber deposits here date back to the 12th century. About 90% of the world's extractable amber is still located in that area, which became the Kaliningrad Oblast of Russia in 1946. Pieces of amber torn from the seafloor are cast up by the waves and collected by hand, dredging, or diving. Elsewhere, amber is mined, both in open works and underground galleries. Then nodules of blue earth have to be removed and an opaque crust must be cleaned off, which can be done in revolving barrels containing sand and water. Erosion removes this crust from sea-worn amber. Dominican amber is mined through bell pitting, which is dangerous due to the risk of tunnel collapse. Another important source of amber is Kachin State in northern Myanmar, which has been a major source of amber in China for at least 1800 years. Contemporary mining of this deposit has attracted attention for unsafe working conditions and its role in funding internal conflict in the country. Amber from the Rivne Oblast of Ukraine, referred to as Rovno amber, is mined illegally by organised crime groups, who deforest the surrounding areas and pump water into the sediments to extract the amber, causing severe environmental deterioration. Treatment The Vienna amber factories, which use pale amber to manufacture pipes and other smoking tools, turn it on a lathe and polish it with whitening and water or with rotten stone and oil. The final luster is given by friction with flannel. When gradually heated in an oil-bath, amber becomes soft and flexible. Two pieces of amber may be united by smearing the surfaces with linseed oil, heating them, and then pressing them together while hot. Cloudy amber may be clarified in an oil-bath, as the oil fills the numerous pores to which the turbidity is due. Small fragments, formerly thrown away or used only for varnish, are now used on a large scale in the formation of "ambroid" or "pressed amber". The pieces are carefully heated with exclusion of air and then compressed into a uniform mass by intense hydraulic pressure, the softened amber being forced through holes in a metal plate. The product is extensively used for the production of cheap jewelry and articles for smoking. This pressed amber yields brilliant interference colors in polarized light. Amber has often been imitated by other resins like copal and kauri gum, as well as by celluloid and even glass. Baltic amber is sometimes colored artificially, but also called "true amber". Appearance Amber occurs in a range of different colors. As well as the usual yellow-orange-brown that is associated with the color "amber", amber itself can range from a whitish color through a pale lemon yellow, to brown and almost black. Other uncommon colors include red amber (sometimes known as "cherry amber"), green amber, and even blue amber, which is rare and highly sought after. Yellow amber is a hard fossil resin from evergreen trees, and despite the name it can be translucent, yellow, orange, or brown colored. Known to the Iranians by the Pahlavi compound word kah-ruba (from kah "straw" plus rubay "attract, snatch", referring to its electrical properties), which entered Arabic as kahraba' or kahraba (which later became the Arabic word for electricity, كهرباء kahrabā'), it too was called amber in Europe (Old French and Middle English ambre). Found along the southern shore of the Baltic Sea, yellow amber reached the Middle East and western Europe via trade. Its coastal acquisition may have been one reason yellow amber came to be designated by the same term as ambergris. Moreover, like ambergris, the resin could be burned as an incense. The resin's most popular use was, however, for ornamentation—easily cut and polished, it could be transformed into beautiful jewelry. Much of the most highly prized amber is transparent, in contrast to the very common cloudy amber and opaque amber. Opaque amber contains numerous minute bubbles. This kind of amber is known as "bony amber". Although all Dominican amber is fluorescent, the rarest Dominican amber is blue amber. It turns blue in natural sunlight and any other partially or wholly ultraviolet light source. In long-wave UV light it has a very strong reflection, almost white. Only about is found per year, which makes it valuable and expensive. Sometimes amber retains the form of drops and stalactites, just as it exuded from the ducts and receptacles of the injured trees. It is thought that, in addition to exuding onto the surface of the tree, amber resin also originally flowed into hollow cavities or cracks within trees, thereby leading to the development of large lumps of amber of irregular form. Classification Amber can be classified into several forms. Most fundamentally, there are two types of plant resin with the potential for fossilization. Terpenoids, produced by conifers and angiosperms, consist of ring structures formed of isoprene (C5H8) units. Phenolic resins are today only produced by angiosperms, and tend to serve functional uses. The extinct medullosans produced a third type of resin, which is often found as amber within their veins. The composition of resins is highly variable; each species produces a unique blend of chemicals which can be identified by the use of pyrolysis–gas chromatography–mass spectrometry. The overall chemical and structural composition is used to divide ambers into five classes. There is also a separate classification of amber gemstones, according to the way of production. Class I This class is by far the most abundant. It comprises labdatriene carboxylic acids such as communic or ozic acids. It is further split into three sub-classes. Classes Ia and Ib utilize regular labdanoid diterpenes (e.g. communic acid, communol, biformenes), while Ic uses enantio labdanoids (ozic acid, ozol, enantio biformenes). Ia Class Ia includes Succinite (= 'normal' Baltic amber) and Glessite. They have a communic acid base, and they also include much succinic acid. Baltic amber yields on dry distillation succinic acid, the proportion varying from about 3% to 8%, and being greatest in the pale opaque or bony varieties. The aromatic and irritating fumes emitted by burning amber are mainly due to this acid. Baltic amber is distinguished by its yield of succinic acid, hence the name succinite. Succinite has a hardness between 2 and 3, which is rather greater than that of many other fossil resins. Its specific gravity varies from 1.05 to 1.10. It can be distinguished from other ambers via IR spectroscopy due to a specific carbonyl absorption peak. IR

maternal grandfather, Theodoric the Great, acting through his vice-regent, an Ostrogothic nobleman named Theudis. The older son, Gesalec, was chosen as king but his reign was disastrous. King Theoderic of the Ostrogoths sent an army, led by his sword-bearer Theudis, against Gesalec, ostensibly on behalf of Amalaric; Gesalec fled to Africa. The Ostrogoths then drove back the Franks and their Burgundian allies, regaining possession of "the south of Novempopulana, Rodez, probably even Albi, and even Toulose". Following the 511 death of Clovis, Theoderic negotiated a peace with Clovis' successors, securing Visigothic control of the southernmost portion of Gaul for the rest of the existence of their kingdom. In 522, the young Amalaric was proclaimed king, and four years later, on Theoderic's death, he assumed full royal power, although relinquishing Provence to his cousin Athalaric. His kingdom was faced with a Frankish threat from the north; according to Peter Heather, this was his motivation for marrying Chrotilda, the daughter of Clovis. However, this was not successful, for according to Gregory of Tours, Amalaric pressured her to forsake Orthodoxy and convert to Arian Christianity, at

and Portuguese: Amalarico; 502–531) was king of the Visigoths from 522 until his death in battle in 531. He was a son of king Alaric II and his first wife Theodegotha, daughter of Theoderic the Great. Biography When Alaric II was killed while fighting Clovis I, king of the Franks, in the Battle of Vouillé (507), his kingdom fell into disarray. "More serious than the destruction of the Gothic army," writes Herwig Wolfram, "than the loss of both Aquitanian provinces and the capital of Toulose, was the death of the king." Alaric had made no provision for a successor, and although he had two sons, one was of age but illegitimate and the other, Amalaric, the offspring of a legal marriage but still a child. Amalaric was carried for safety into Spain, which country and Provence were thenceforth ruled by his maternal grandfather, Theodoric the Great, acting through his vice-regent, an Ostrogothic nobleman named Theudis. The older son, Gesalec, was chosen as king but his reign was disastrous. King Theoderic of the Ostrogoths sent an army, led by his sword-bearer Theudis, against Gesalec, ostensibly on behalf of Amalaric; Gesalec fled to Africa. The Ostrogoths then drove back the Franks and their Burgundian allies, regaining possession of "the south of Novempopulana, Rodez, probably even Albi, and even Toulose". Following the 511 death of Clovis, Theoderic negotiated a peace with Clovis' successors, securing Visigothic control of the southernmost portion of Gaul for the rest of the existence of their kingdom. In 522, the young Amalaric was proclaimed king, and four years later, on Theoderic's

of the higher tones is due in part to the relatively small diameter of the bore of the mouthpiece and tubing in relation to the overall length of the horn. The well-known "Ranz des Vaches" (score; audio) is a traditional Swiss melody often heard on the alphorn. The song describes the time of bringing the cows to the high country at milk making time. Rossini introduced the "Ranz des Vaches" into his masterpiece William Tell, along with many other delightful melodies scattered throughout the opera in vocal and instrumental parts that are well-suited to the alphorn. Brahms wrote to Clara Schumann that the inspiration for the dramatic entry of the horn in the introduction to the last movement of his First Symphony was an alphorn melody he heard while vacationing in the Rigi area of Switzerland. For Clara's birthday in 1868 Brahms sent her a greeting that was to be sung with the melody. Music for alphorn Among music composed for the alphorn: Concerto Grosso No. 1 (2013) for four alphorns and orchestra by Georg Friedrich Haas Sinfonia pastorale for corno pastoriccio in G (alphorn) and string orchestra (1755) by Leopold Mozart Concerto for alphorn and orchestra (1970) by Jean Daetwyler Concerto No. 2 for alphorn (with flute, string orchestra and percussion) (1983) by Daetwyler Dialogue with Nature for alphorn, flute, and orchestra by Daetwyler Super Alpen King for three alphorns and orchestra by Ghislain Muller (2001) VSP orkestra / Arkady Shilkloper, Renaud Leipp Concertino rustico (1977) by Ferenc Farkas Begegnung for three alphorns and concert band, by Kurt Gable. Säumerweg-Blues (audio played by Kurt Ott) among many compositions by Hans-Jürg Sommer, Alphorn Musik Messe for alphorn and choir by Franz Schüssele Alphorn-Center Erbauliche Studie für 12 Alphörner in Abwesenheit von Bergen by Mathias Rüegg (1998) Wolf Music: Tapio for alphorn and echoing instruments (2003) by R. Murray Schafer Le Berger fantaisiste for three alphorns and orchestra by Ghislain Muller, Arkady Shilkloper, Renaud Leipp, Serge Haessler, VSP orkestra (2001) Bob Downes & The Alphorn Brothers (2015) by Bob Downes Open Music (CD rec. 2004) Concerto for alphorn in F and orchestra by Daniel Schnyder (2004) Matterhorn (a prelude for alphorn and wind orchestra) by Robert Litton (2013) Alpine Trail for alphorn and orchestra by Arkady Shilkloper Lai nair for alphorn and contrabass by John Wolf Brennan (2015) Der Bergschuh for alphorn and marching band by Daniel Schnyder Crested Butte Mountain for alphorn and wind band (or brass sextet, strings, or horn septet) by Arkady Shilkloper Robin for alphorn and wind band (big band) by Arkady Shilkloper Fanfare for four alphorns by Arkady Shilkloper In popular culture The alphorn is prominently featured in advertisements for Ricola cough drops, which are manufactured in Laufen, Switzerland See also Bucium, a type of alphorn used by mountain dwellers in Romania Didgeridoo, an instrument of Aboriginal Australian origins, traditionally made from a hollowed out eucalyptus tree trunk Erke, a similar instrument of Argentine Northwest Kuhreihen, a type of melody played on an alphorn Tiba, wind instrument made of wood or metal that originates in the Grisons canton in

instrument is complete. An alphorn made at Rigi-Kulm, Schwyz, and now in the Victoria and Albert Museum, measures in length and has a straight tube. The Swiss alphorn varies in shape according to the locality, being curved near the bell in the Bernese Oberland. Michael Praetorius mentions an alphorn-like instrument under the name of Hölzern Trummet (wooden trumpet) in Syntagma Musicum (Wittenberg, 1615–1619; Pl. VIII). The alphorn has no lateral openings and therefore gives the pure natural harmonic series of the open pipe. The notes of the natural harmonic series overlap, but do not exactly correspond, to notes found in the familiar chromatic scale in standard Western equal temperament. Most prominently within the alphorn's range, the 7th and 11th harmonics are particularly noticeable, because they fall between adjacent notes in the chromatic scale. Accomplished alphornists often command a range of nearly three octaves, consisting of the 2nd through the 16th notes of the harmonic series. The availability of the higher tones is due in part to the relatively small diameter of the bore of the mouthpiece and tubing in relation to the overall length of the horn. The well-known "Ranz des Vaches" (score; audio) is a traditional Swiss melody often heard on the alphorn. The song describes the time of bringing the cows to the high country at milk making time. Rossini introduced the "Ranz des Vaches" into his masterpiece William Tell, along with many other delightful melodies scattered throughout the opera in vocal and instrumental parts that are well-suited to the alphorn. Brahms wrote to Clara Schumann that the inspiration for the dramatic entry of the horn in the introduction to the last movement of his First Symphony was an alphorn melody he heard while vacationing in the Rigi area of Switzerland. For Clara's birthday in 1868 Brahms sent her a greeting that was to be sung with the melody. Music for alphorn Among music composed for the alphorn: Concerto Grosso No. 1 (2013) for four alphorns and orchestra by Georg Friedrich Haas Sinfonia pastorale for corno pastoriccio in G (alphorn) and string orchestra (1755) by Leopold Mozart Concerto for alphorn and orchestra (1970) by Jean Daetwyler Concerto No. 2 for alphorn (with flute, string orchestra and percussion) (1983) by Daetwyler Dialogue with Nature for alphorn, flute, and orchestra by Daetwyler Super Alpen King for three alphorns and orchestra by Ghislain Muller (2001) VSP orkestra / Arkady Shilkloper, Renaud Leipp Concertino rustico (1977) by Ferenc Farkas Begegnung for three alphorns and concert band, by Kurt Gable. Säumerweg-Blues (audio played by Kurt Ott) among many compositions by Hans-Jürg Sommer, Alphorn Musik Messe for alphorn and choir by Franz Schüssele Alphorn-Center Erbauliche Studie für 12 Alphörner in Abwesenheit von Bergen by Mathias Rüegg (1998) Wolf Music: Tapio for alphorn and echoing instruments (2003) by R. Murray Schafer Le Berger fantaisiste for three alphorns and orchestra

Italy they came to dominate the armies of the city states. This made them considerably less reliable than a standing army. Mercenary-on-mercenary warfare in Italy also led to relatively bloodless campaigns which relied as much on maneuver as on battles. In 1439 the French legislature, known as the Estates General (French: états généraux), passed laws that restricted military recruitment and training to the king alone. There was a new tax to be raised known as the taille that was to provide funding for a new Royal army. The mercenary companies were given a choice of either joining the Royal army as compagnies d'ordonnance on a permanent basis, or being hunted down and destroyed if they refused. France gained a total standing army of around 6,000 men, which was sent out to gradually eliminate the remaining mercenaries who insisted on operating on their own. The new standing army had a more disciplined and professional approach to warfare than its predecessors. The reforms of the 1440s, eventually led to the French victory at Castillon in 1453, and the conclusion of the Hundred Years' War. By 1450 the companies were divided into the field army, known as the grande ordonnance and the garrison force known as the petite ordonnance. Early modern First nation states lacked the funds needed to maintain standing forces, so they tended to hire mercenaries to serve in their armies during wartime. Such mercenaries typically formed at the ends of periods of conflict, when men-at-arms were no longer needed by their respective governments. The veteran soldiers thus looked for other forms of employment, often becoming mercenaries. Free Companies would often specialize in forms of combat that required longer periods of training that was not available in the form of a mobilized militia. As late as the 1650s, most troops were mercenaries. However, after the 17th century, most states invested in better disciplined and more politically reliable permanent troops. For a time mercenaries became important as trainers and administrators, but soon these tasks were also taken by the state. The massive size of these armies required a large supporting force of administrators. The newly centralized states were forced to set up vast organized bureaucracies to manage these armies, which some historians argue is the basis of the modern bureaucratic state. The combination of increased taxes and increased centralisation of government functions caused a series of revolts across Europe such as the Fronde in France and the English Civil War. In many countries, the resolution of this conflict was the rise of absolute monarchy. Only in England and the Netherlands did representative government evolve as an alternative. From the late 17th century, states learned how to finance wars through long term low interest loans from national banking institutions. The first state to master this process was the Dutch Republic. This transformation in the armies of Europe had great social impact. The defense of the state now rested on the commoners, not on the aristocrats. However, aristocrats continued to monopolise the officer corps of almost all early modern armies, including their high command. Moreover, popular revolts almost always failed unless they had the support and patronage of the noble or gentry classes. The new armies, because of their vast expense, were also dependent on taxation and the commercial classes who also began to demand a greater role in society. The great commercial powers of the Dutch and English matched much larger states in military might. As any man could be quickly trained in the use of a musket, it became far easier to form massive armies. The inaccuracy of the weapons necessitated large groups of massed soldiers. This led to a rapid swelling of the size of armies. For the first time huge masses of the population could enter combat, rather than just the highly skilled professionals. It has been argued that the drawing of men from across the nation into an organized corps helped breed national unity and patriotism, and during this period the modern notion of the nation state was born. However, this would only become apparent after the French Revolutionary Wars. At this time, the levée en masse and conscription would become the defining paradigm of modern warfare. Before then, however, most national armies were in fact composed of many nationalities. In Spain armies were recruited from all the Spanish European territories including Spain, Italy, Wallonia (Walloon Guards) and Germany. The French recruited some soldiers from Germany, Switzerland as well as from Piedmont. Britain recruited Hessian and Hanovrian troops until the late 18th century. Irish Catholics made careers for themselves in the armies of many Catholic European states. Prior to the English Civil War in England, the monarch maintained a personal bodyguard of Yeomen of the Guard and the Honourable Corps of Gentlemen at Arms, or "gentlemen pensioners", and a few locally raised companies to garrison important places such as Berwick on Tweed or Portsmouth (or Calais before it was recaptured by France in 1558). Troops for foreign expeditions were raised upon an ad hoc basis. Noblemen and professional regular soldiers were commissioned by the monarch to supply troops, raising their quotas by indenture from a variety of sources. On January 26, 1661 Charles II issued the Royal Warrant that created the genesis of what would become the British Army, although the Scottish and English Armies would remain two separate organizations until the unification of England and Scotland in 1707. The small force was represented by only a few regiments. After the American Revolutionary War the Continental

Army (PLA) being the overall military, the land force being the PLA Ground Force, and so forth for the PLA Air Force, the PLA Navy, and other branches. By convention, irregular military is understood in contrast to regular armies which grew slowly from personal bodyguards or elite militia. Regular in this case refers to standardized doctrines, uniforms, organizations, etc. Regular military can also refer to full-time status (standing army), versus reserve or part-time personnel. Other distinctions may separate statutory forces (established under laws such as the National Defence Act), from de facto "non-statutory" forces such as some guerrilla and revolutionary armies. Armies may also be expeditionary (designed for overseas or international deployment) or fencible (designed for – or restricted to – homeland defence). History India India's armies were among the first in the world. The first recorded battle, the Battle of the Ten Kings, happened when a Hindu Aryan king named Sudas defeated an alliance of ten kings and their supportive chieftains. During the Iron Age, the Maurya and Nanda Empires had the largest armies in the world, the peak being approximately over 600,000 Infantry, 30,000 Cavalry, 8,000 War-Chariots and 9,000 War Elephants not including tributary state allies. In the Gupta age, large armies of longbowmen were recruited to fight off invading horse archer armies. Elephants, pikemen and cavalry were other featured troops. In Rajput times, the main piece of equipment was iron or chain-mail armor, a round shield, either a curved blade or a straight sword, a chakra disc, and a katar dagger. China The states of China raised armies for at least 1000 years before the Spring and Autumn Annals. By the Warring States period, the crossbow had been perfected enough to become a military secret, with bronze bolts that could pierce any armor. Thus any political power of a state rested on the armies and their organization. China underwent political consolidation of the states of Han (韓), Wei (魏), Chu (楚), Yan (燕), Zhao (趙) and Qi (齊), until by 221 BCE, Qin Shi Huang (秦始皇帝), the first emperor of the Qin dynasty, attained absolute power. This first emperor of China could command the creation of a Terracotta Army to guard his tomb in the city of Xi'an (西安), as well as a realignment of the Great Wall of China to strengthen his empire against insurrection, invasion and incursion. Sun Tzu's The Art of War remains one of China's Seven Military Classics, even though it is two thousand years old. Since no political figure could exist without an army, measures were taken to ensure only the most capable leaders could control the armies. Civil bureaucracies (士大夫) arose to control the productive power of the states, and their military power. Sparta The Spartan Army was one of the earliest known professional armies. Boys were sent to a barracks at the age of seven or eight to train for becoming a soldier. At the age of thirty, they were released from the barracks and allowed to marry and have a family. After that, men devoted their lives to war until their retirement at the age of 60. The Spartan Army was largely composed of hoplites, equipped with arms and armor nearly identical to each other. Each hoplite bore the Spartan emblem and a scarlet uniform. The main pieces of this armor were a round shield, a spear and a helmet. Ancient Rome The Roman Army had its origins in the citizen army of the Republic, which was staffed by citizens serving mandatory duty for Rome. Reforms turned the army into a professional organization which was still largely filled by citizens, but these citizens served continuously for 25 years before being discharged. The Romans were also noted for making use of auxiliary troops, non-Romans who served with the legions and filled roles that the traditional Roman military could not fill effectively, such as light skirmish troops and heavy cavalry. After their service in the army they were made citizens of Rome and then their children were citizens also. They were also given land and money to settle in Rome. In the Late Roman Empire, these auxiliary troops, along with foreign mercenaries, became the core of the Roman Army; moreover, by the time of the Late Roman Empire tribes such as the Visigoths were paid to serve as mercenaries. Medieval Europe In the earliest Middle Ages it was the obligation of every aristocrat to respond to the call to battle with his own equipment, archers, and infantry. This decentralized system was necessary due to the social order of the time, but could lead to motley forces with variable training, equipment and abilities. The more resources the noble had access to, the better his troops would be. Initially, the words "knight" and "noble" were used interchangeably as there was not generally a distinction between them. While the nobility did fight upon horseback, they were also supported by lower class citizens – and mercenaries and criminals – whose only purpose was participating in warfare because, most often than not, they held brief employment during their lord's engagement. As the Middle Ages progressed and feudalism developed in a legitimate social and economic system, knights started to develop into their own class with a minor caveat: they were still in debt to their lord. No longer primarily driven by economic need, the newly established vassal class were, instead, driven by fealty and chivalry. As central governments grew in power, a return to the citizen armies of the classical period also began, as central levies of the peasantry began to be the central recruiting tool. England was one of the most centralized states in the Middle Ages, and the armies that fought in the Hundred Years' War were, predominantly, composed of paid professionals. In theory, every Englishman had an obligation to serve for forty days. Forty days was not long enough for a campaign, especially one on the continent. Thus the scutage was introduced, whereby most Englishmen paid to escape their service and this money was used to create a permanent army. However, almost all high medieval armies in Europe were composed of a great deal of paid core troops, and there was a large mercenary market in Europe from at least the early 12th century. As the Middle Ages progressed in Italy, Italian cities began to rely mostly on mercenaries to do their fighting rather than the militias that had dominated the early and high medieval period in this region. These would be groups of career soldiers who would be paid a set rate. Mercenaries tended to be effective soldiers, especially in combination with standing forces, but in Italy they came to dominate the armies of the city states. This made them considerably less reliable than a standing army. Mercenary-on-mercenary warfare in Italy also led to relatively bloodless campaigns which relied as much on maneuver as on battles. In 1439 the French legislature, known as the Estates General (French: états généraux), passed laws that restricted military recruitment and training to the king alone. There was a new tax to be raised known as the taille that was to provide funding for a new Royal army. The mercenary companies were given a choice of either joining the Royal army as compagnies d'ordonnance on a permanent basis, or being hunted down and destroyed if they refused. France gained a total standing army of around 6,000 men, which was sent out to gradually eliminate the remaining mercenaries who insisted on operating on their own. The new standing army had a more disciplined and professional approach to warfare than its predecessors. The reforms of the 1440s, eventually led to the French victory at Castillon in 1453, and the conclusion of the Hundred Years' War. By 1450 the companies were divided into the field army, known as the grande ordonnance and the garrison force known as the petite ordonnance. Early modern First nation states lacked the funds needed to maintain standing forces, so they tended to hire mercenaries to serve in their armies during wartime. Such mercenaries typically formed at the ends of periods of conflict, when men-at-arms were no longer needed by their respective governments. The veteran soldiers thus looked for other forms of employment, often becoming mercenaries. Free Companies would often specialize in forms of combat that required longer periods of training that was not available in the form of a mobilized militia. As late as the 1650s, most troops were mercenaries. However, after the 17th century, most states invested in better disciplined and more politically reliable permanent troops. For a time mercenaries became important as trainers and administrators, but soon these tasks were also taken by the state. The massive size of these armies required a large

from the Spanish el lagarto, which means "the lizard". Caimans In Central and South America, the alligator family is represented by six species of the subfamily Caimaninae, which differ from the alligator by the absence of a bony septum between the nostrils, and having ventral armour composed of overlapping bony scutes, each of which is formed of two parts united by a suture. Besides the three species in Caiman, the smooth-fronted caimans in genus Paleosuchus and the black caiman in Melanosuchus are described. Caimans tend to be more agile and crocodile-like in their movements, and have longer, sharper teeth than alligators. C. crocodilus, the spectacled caiman, has the widest distribution, from southern Mexico to the northern half of Argentina, and grows to a modest size of about . The largest is the near-threatened Melanosuchus niger, the jacaré-açu or large or black caiman of the Amazon River basin. Black caimans grow to , with the unverified size of up to . The black caiman and American alligator are the only members of the alligator family that pose the same danger to humans as the larger species of the crocodile family. Although caimans have not been studied in depth, scientists have learned their mating cycles (previously thought to be spontaneous or year-round) are linked to the rainfall cycles and the river levels, which increases chances of survival for their offspring. Taxonomy Family Alligatoridae Subfamily Alligatorinae Genus Alligator † Alligator hailensis † Alligator mcgrewi † Alligator mefferdi Alligator mississippiensis, American alligator † Alligator olseni † Alligator prenasalis Alligator sinensis, Chinese alligator † Alligator thomsoni Genus † Allognathosuchus Genus † Arambourgia Genus † Ceratosuchus Genus † Chrysochampsa Genus † Eoalligator Genus † Hassiacosuchus Genus † Krabisuchus Genus † Navajosuchus? Genus † Procaimanoidea Genus † Wannaganosuchus Subfamily Caimaninae Genus † Acresuchus Genus † Bottosaurus Genus Caiman † Caiman brevirostris Caiman crocodilus, Spectacled caiman Caiman latirostris, Broad-snouted caiman † Caiman lutescans † Caiman venezuelensis † Caiman wannlangstoni Caiman yacare, Yacare caiman Genus † Centenariosuchus Genus † Chinatichampsus Genus †

crown group Alligatoridae. As a crown group, Alligatoridae only includes the last common ancestor of all extant (living) alligators, caimans, and their descendants (living or extinct), whereas Alligatoroidea, as a stem-based group, also includes more basal extinct alligator ancestors that are more closely related to living alligators than to crocodiles or gavialids. When considering only living taxa (neontology), this makes Alligatoroidea and Alligatoridae redundant. The simplified cladogram below shows Alligatoridae's relationships to other extant (living) crocodilians. The below detailed cladogram shows one proposal for the internal relationships within Alligatoridae (although the exact alligatoroid phylogeny is still disputed). Evolution The superfamily Alligatoroidea is thought to have split from the crocodile-gharial lineage in the late Cretaceous, about 87 million years ago. Leidyosuchus of Alberta is the earliest known genus. Fossil alligatoroids have been found throughout Eurasia as land bridges across both the North Atlantic and the Bering Strait have connected North America to Eurasia during the Cretaceous, Paleogene, and Neogene periods. Alligators and caimans split in North America during the early Tertiary or late Cretaceous (about 53 million to about 65 million years ago) and the latter reached South America by the Paleogene, before the closure of the Isthmus of Panama during the Neogene period. The Chinese alligator split from the American alligator about 33 million years ago and likely descended from a lineage that crossed the Bering land bridge during the Neogene. The modern American alligator is well represented in the fossil record of the Pleistocene. The alligator's full mitochondrial genome was sequenced in the 1990s. The full genome, published in 2014, suggests that the alligator evolved much more slowly than mammals and birds. True alligators The lineage including alligators proper (Alligatorinae) occurs in the fluvial deposits of the age of the Upper Chalk in Europe, where they did not die out until the Pliocene age. The

verified that red alder contains betulin and lupeol, compounds shown to be effective against a variety of tumors. The inner bark of the alder, as well as red osier dogwood, or chokecherry, is used by some Indigenous peoples of the Americas in smoking mixtures, known as kinnikinnick, to improve the taste of the bearberry leaf. Alder is illustrated in the coat of arms for the Austrian town of Grossarl. Electric guitars, most notably those manufactured by the Fender Musical Instruments Corporation, have been built with alder bodies since the 1950s. Alder is appreciated for its tone that is claimed to be tight and evenly balanced, especially when compared to mahogany, and has been adopted by many electric guitar manufacturers. As a hardwood, alder is used in making furniture, cabinets, and other woodworking products. For example, in the television series Northern Exposure season 3 episode "Things Become Extinct" (1992), Native American Ira Wingfeather makes duck flutes out of alder tree branches while Ed Chigliak films. Ermanno Olmi's movie The Tree of Wooden Clogs (L' Albero Degli Zoccoli, 1978) refers in its title to alder, typically used to make clogs as in this movie's plot. Alder bark and wood (like oak and sweet chestnut) contain tannin and are traditionally used to tan leather. A red dye can also be extracted from the outer bark, and a yellow dye from the inner bark. Evolutionary history The oldest fossil pollen that can be identified as Alnus is from northern Bohemia, dating to the late Paleocene, around 58 million years ago. Classification The genus is divided into three subgenera: Subgenus Alnus Trees with stalked shoot buds, male and female catkins produced in autumn (fall) but stay closed over winter, pollinating in late winter or early spring, about 15–25 species, including: Alnus acuminata Kunth – Andean alder, aliso. Mexico, Central and South America. subsp. acuminata Kunth subsp. arguta (Schltdl.) Furlow subsp. glabrata (Fernald) Furlow Alnus cordata (Loisel.) Duby – Italian alder. Italy, Corsica. Alnus cremastogyne Burkill – China. Alnus firma Siebold & Zucc. – Kyūshū Island in Japan Alnus glutinosa (L.) Gaertn. – black alder. Europe, Central Asia. subsp. barbata (C.A.Mey.) Yalt. subsp. glutinosa (L.) Gaertn. subsp. incisa (Willd.) Regel subsp. laciniata (Willd.) Regel Alnus hirsuta (Spach) Rupr. – Manchurian alder. Japan, Korea, Manchuria, Siberia, Russian Far East Alnus incana (L.) Moench subsp. incana (L.) Moench – speckled alder or grey alder. Eurasia, North America subsp. kolaensis (Orlova) Á.Löve & D.Löve subsp. rugosa (Du Roi) R.T.Clausen subsp. tenuifolia (Nutt.) Breitung Alnus japonica (Thunb.) Steud. – Japanese alder, Japan, Korea, Taiwan, eastern China, Russian Far East Alnus jorullensis Kunth – Mexican alder. Mexico, Guatemala, Honduras. subsp. lutea Furlow subsp. jorullensis Kunth Alnus lusitanica Vít, Douda, & Mandák - Spain, Portugal, Morocco Alnus matsumurae Callier – Honshū Island in Japan Alnus nepalensis D.Don – Nepalese alder. Himalayas, Tibet, Yunnan, Nepal, Bhutan, Myanmar, Thailand. Alnus oblongifolia Torr. – Arizona alder. Arizona, New Mexico, Sonora, Chihuahua Alnus orientalis Decne. – Oriental alder. Southern Turkey, northwest Syria, Cyprus, Lebanon, Iran Alnus rhombifolia Nutt. – white alder. California, Nevada, Oregon, Washington, Idaho, Montana Alnus rohlenae Vít, Douda, & Mandák - Western Balkans Alnus rubra Bong. – red alder. Alaska, Yukon, British Columbia, California, Oregon, Washington, Idaho, Montana. Alnus serrulata (Aiton) Willd. – hazel alder, tag alder or smooth alder. Eastern North America Alnus subcordata C.A.Mey. – Caucasian alder. Caucasus, Iran Alnus tenuifolia Nutt. – thinleaf or mountain alder. Northwestern North America Alnus trabeculosa Hand.-Mazz. – China, Japan Subgenus Clethropsis Trees or shrubs with stalked shoot buds, male and female catkins produced in autumn (fall) and expanding and pollinating then, three species: Alnus formosana (Burkill) Makino – Formosan alder. Taiwan Alnus maritima (Marshall) Muhl. ex Nutt. – seaside alder. United States (Georgia, Delaware, Maryland, Oklahoma). Alnus nitida (Spach) Endl. – Himalayan alder. Western Himalaya, Pakistan, India, Nepal. Subgenus Alnobetula Shrubs with shoot buds not stalked, male and female catkins produced in late

northwest alders, has an affinity for warm, dry climates, where it grows along watercourses, such as along the lower Columbia River east of the Cascades and the Snake River, including Hells Canyon. Alder leaves and sometimes catkins are used as food by numerous butterflies and moths. A. glutinosa and A. viridis are classed as environmental weeds in New Zealand. Alder leaves and especially the roots are important to the ecosystem because they enrich the soil with nitrogen and other nutrients. Nitrogen fixation and the Succession of woodland species Alder is particularly noted for its important symbiotic relationship with Frankia alni, an actinomycete, filamentous, nitrogen-fixing bacterium. This bacterium is found in root nodules, which may be as large as a human fist, with many small lobes, and light brown in colour. The bacterium absorbs nitrogen from the air and makes it available to the tree. Alder, in turn, provides the bacterium with sugars, which it produces through photosynthesis. As a result of this mutually beneficial relationship, alder improves the fertility of the soil where it grows, and as a pioneer species, it helps provide additional nitrogen for the successional species to follow. Because of its abundance, red alder delivers large amounts of nitrogen to enrich forest soils. Red alder stands have been found to supply between of nitrogen annually to the soil. From Alaska to Oregon, Alnus viridis subsp. sinuata (A. sinuata, Sitka Alder or Slide Alder), characteristically pioneer fresh, gravelly sites at the foot of retreating glaciers. Studies show that Sitka alder, a more shrubby variety of alder, adds nitrogen to the soil at an average rate of per year, helping convert the sterile glacial terrain to soil capable of supporting a conifer forest. Alders are common among the first species to colonize disturbed areas from floods, windstorms, fires, landslides, etc. Alder groves often serve as natural firebreaks since these broad-leaved trees are much less flammable than conifers. Their foliage and leaf litter does not carry a fire well, and their thin bark is sufficiently resistant to protect them from light surface fires. In addition, the light weight of alder seeds – – allows for easy dispersal by the wind. Although it outgrows coastal Douglas-fir for the first 25 years, it is very shade intolerant and seldom lives more than 100 years. Red alder is the Pacific Northwest's largest alder and the most plentiful and commercially important broad-leaved tree in the coastal Northwest. Groves of red alder in diameter intermingle with young Douglas-fir forests west of the Cascades, attaining a maximum height of in about sixty years and then lose vigor as heart rot sets in. Alders largely help create conditions favorable for giant conifers that replace them. Parasites Alder roots are parasitized by northern groundcone. Uses The catkins of some alder species have a degree of edibility, and may be rich in protein. Reported to have a bitter and unpleasant taste, they are more useful for survival purposes. The wood of certain alder species is often used to smoke various food items such as coffee, salmon, and other seafood. Most of the pilings that form the foundation of Venice were made from alder trees. Alder bark contains the anti-inflammatory salicin, which is metabolized into salicylic acid in the body. Some Native American cultures use red alder bark (Alnus rubra) to treat poison oak, insect bites, and skin irritations. Blackfeet Indians have traditionally used an infusion made from the bark of red alder to treat lymphatic disorders and tuberculosis. Recent clinical studies have verified that red alder contains betulin and lupeol, compounds shown to be effective against a variety of tumors. The inner bark of the alder, as well as red osier dogwood, or chokecherry, is used by some Indigenous peoples of the Americas in smoking mixtures, known as kinnikinnick, to improve the taste of the bearberry leaf. Alder is illustrated in the coat of arms for the Austrian town of Grossarl. Electric guitars, most notably those manufactured by the Fender Musical Instruments Corporation, have been built with alder bodies since the 1950s. Alder is appreciated for its tone that is claimed to be tight and evenly balanced, especially when compared to mahogany, and has been adopted by many electric guitar manufacturers. As a hardwood, alder

six acres of land. On May 23, 1845, Abby May was granted a sum from her father's estate which was put into a trust fund, granting minor financial security. That summer, Bronson Alcott let Henry David Thoreau borrow his ax to prepare his home at Walden Pond. The Alcotts hosted a steady stream of visitors at The Hillside, including fugitive slaves, which they hosted in secret as a station of the Underground Railroad. Alcott's opposition to slavery also fueled his opposition to the Mexican–American War which began in 1846. He considered the war a blatant attempt to extend slavery and asked if the country was made up of "a people bent on conquest, on getting the golden treasures of Mexico into our hands, and of subjugating foreign peoples?" In 1848, Abby May insisted they leave Concord, which she called "cold, heartless, brainless, soulless". The Alcott family put The Hillside up for rent and moved to Boston. There, next door to Peabody's book store on West Street, Bronson Alcott hosted a series based on the "Conversations" model by Margaret Fuller called "A Course on the Conversations on Man—his History, Resources, and Expectations". Participants, both men and women, were charged three dollars to attend or five dollars for all seven lectures. In March 1853, Alcott was invited to teach fifteen students at Harvard Divinity School in an extracurricular, non-credit course. Alcott and his family moved back to Concord after 1857, where he and his family lived in the Orchard House until 1877. In 1860, Alcott was named superintendent of Concord Schools. Civil War years and beyond Alcott voted in a presidential election for the first time in 1860. In his journal for November 6, 1860, he wrote: "At Town House, and cast my vote for Lincoln and the Republican candidates generally—the first vote I ever cast for a President and State officers." Alcott was an abolitionist and a friend of the more radical William Lloyd Garrison. He had attended a rally led by Wendell Phillips on behalf of 17-year-old Thomas Sims, a fugitive slave on trial in Boston. Alcott was one of several who attempted to storm the courthouse; when gunshots were heard, he was the only one who stood his ground, though the effort was unsuccessful. He had also stood his ground in a protest against the trial of Anthony Burns. A group had broken down the door of the Boston courthouse but guards beat them back. Alcott stood forward and asked the leader of the group, Thomas Wentworth Higginson, "Why are we not within?" He then walked calmly into the courthouse, was threatened with a gun, and turned back, "but without hastening a step", according to Higginson. In 1862, Louisa moved to Washington, D.C. to volunteer as a nurse. On January 14, 1863, the Alcotts received a telegram that Louisa was sick; Bronson immediately went to bring her home, briefly meeting Abraham Lincoln while there. Louisa turned her experience into the book Hospital Sketches. Her father wrote of it, "I see nothing in the way of a good appreciation of Louisa's merits as a woman and a writer." Henry David Thoreau died on May 6, 1862, likely from an illness he caught from Alcott two years earlier. At Emerson's request, Alcott helped arrange Thoreau's funeral, which was held at First Parish Sanctuary in Concord, despite Thoreau having disavowed membership in the church when he was in his early twenties. Emerson wrote a eulogy, and Alcott helped plan the preparations. Only two years later, neighbor Nathaniel Hawthorne died as well. Alcott served as a pallbearer along with Louis Agassiz, James T. Fields, Oliver Wendell Holmes, Sr., Henry Wadsworth Longfellow, and others. With Hawthorne's death, Alcott worried that few of the Concord notables remained. He recorded in his journal: "Fair figures one by one are fading from sight." The next year, Lincoln was assassinated, which Alcott called "appalling news". In 1868, Alcott met with publisher Thomas Niles, an admirer of Hospital Sketches. Alcott asked Niles if he would publish a book of short stories by his daughter; instead, he suggested she write a book about girls. Louisa May was not interested initially but agreed to try. "They want a book of 200 pages or more", Alcott told his daughter. The result was Little Women, published later that year. The book, which fictionalized the Alcott family during the girls' coming-of-age years, recast the father figure as a chaplain, away from home at the front in the Civil War. Alcott spoke, as opportunity arose, before the "lyceums" then common in various parts of the United States, or addressed groups of hearers as they invited him. These "conversations" as he called them, were more or less informal talks on a great range of topics, spiritual, aesthetic and practical, in which he emphasized the ideas of the school of American Transcendentalists led by Emerson, who was always his supporter and discreet admirer. He often discussed Platonic philosophy, the illumination of the mind and soul by direct communion with Spirit; upon the spiritual and poetic monitions of external nature; and upon the benefit to man of a serene mood and a simple way of life. Final years Alcott's published books, all from late in his life, include Tablets (1868), Concord Days (1872), New Connecticut (1881), and Sonnets and Canzonets (1882). Louisa May attended to her father's needs in his final years. She purchased a house for her sister Anna which had been the last home of Henry David Thoreau, now known as the Thoreau-Alcott House. Louisa and her parents moved in with Anna as well. After the death of his wife Abby May on November 25, 1877, Alcott never returned to Orchard House, too heartbroken to live there. He and Louisa May collaborated on a memoir and went over her papers, letters, and journals. "My heart bleeds with the memories of those days", he wrote, "and even long years, of cheerless anxiety and hopeless dependence." Louisa noted her father had become "restless with his anchor gone". They gave up on the memoir project and Louisa burned many of her mother's papers. On January 19, 1879, Alcott and Franklin Benjamin Sanborn wrote a prospectus for a new school which they distributed to potentially interested people throughout the country. The result was the Concord School of Philosophy and Literature, which held its first session in 1879 in Alcott's study in the Orchard House. In 1880 the school moved to the Hillside Chapel, a building next to the house, where he held conversations and, over the course of successive summers, as he entered his eighties, invited others to give lectures on themes in philosophy, religion and letters. The school, considered one of the first formal adult education centers in America, was also attended by foreign scholars. It continued for nine years. In April 1882, Alcott's friend and benefactor Ralph Waldo Emerson was sick and bedridden. After visiting him, Alcott wrote, "Concord will be shorn of its human splendor when he withdraws behind the cloud." Emerson died the next day. Alcott himself moved out of Concord for his final years, settling at 10 Louisburg Square in Boston beginning in 1885. As he was bedridden at the end of his life, Alcott's daughter Louisa May came to visit him at Louisburg on March 1, 1888. He said to her, "I am going up. Come with me." She responded, "I wish I could." He died three days later on March 4; Louisa May died only two days after her father. Beliefs Alcott was fundamentally and philosophically opposed to corporal punishment as a means of disciplining his students. Instead, beginning at the Temple School, he would appoint a daily student superintendent. When that student observed an infraction, he or she reported it to the rest of the class and, as a whole, they deliberated on punishment. At times, Alcott offered his own hand for an offending student to strike, saying that any failing was the teacher's responsibility. The shame and guilt this method induced, he believed, was far superior to the fear instilled by corporal punishment; when he used physical "correction" he required that the students be unanimously in support of its application, even including the student to be punished. The most detailed discussion of his theories on education is in an essay, "Observations on the Principles and Methods of Infant Instruction". Alcott believed that early education must draw out "unpremeditated thoughts and feelings of the child" and emphasized that infancy should primarily focus on enjoyment. He noted that learning was not about the acquisition of facts but the development of a reflective state of mind. Alcott's ideas as an educator were controversial. Writer Harriet Martineau, for example, wrote dubiously that, "the master presupposes his little pupils possessed of all truth; and that his business is to bring it out into expression". Even so, his ideas helped to found one of the first adult education centers in America, and provided the foundation for future generations of liberal education. Many of Alcott's educational principles are still used in classrooms today, including "teach by encouragement", art education, music education, acting exercises, learning through experience, risk-taking in the classroom, tolerance in schools, physical education/recess, and early childhood education. The teachings of William Ellery Channing a few years earlier had also laid the groundwork for the work of most of the Concord Transcendentalists. The Concord School of Philosophy, which closed following Alcott's death in 1888, was reopened almost 90 years later in the 1970s. It has continued functioning with a Summer Conversational Series in its original building at Orchard House, now run by the Louisa May Alcott Memorial Association. While many of Alcott's ideas continue to be perceived as being on the liberal/radical edge, they are still common themes in

college. Bronson gave it up after only a month and was self-educated from then on. He was not particularly social and his only close friend was his neighbor and second cousin William Alcott, with whom he shared books and ideas. Bronson Alcott later reflected on his childhood at Spindle Hill: "It kept me pure ... I dwelt amidst the hills ... God spoke to me while I walked the fields." Starting at age 15, he took a job working for clockmaker Seth Thomas in the nearby town of Plymouth. At age 17, Alcott passed the exam for a teaching certificate but had trouble finding work as a teacher. Instead, he left home and became a traveling salesman in the American South, peddling books and merchandise. He hoped the job would earn him enough money to support his parents, "to make their cares, and burdens less ... and get them free from debt", though he soon spent most of his earnings on a new suit. At first, he thought it an acceptable occupation but soon worried about his spiritual well-being. In March 1823, Alcott wrote to his brother: "Peddling is a hard place to serve God, but a capital one to serve Mammon." Near the end of his life, he fictionalized this experience in his book, New Connecticut, originally circulated only among friends before its publication in 1881. Early career and marriage By the summer of 1823, Alcott returned to Connecticut in debt to his father, who bailed him out after his last two unsuccessful sales trips. He took a job as a schoolteacher in Cheshire with the help of his Uncle Tillotson. He quickly set about reforming the school. He added backs to the benches on which students sat, improved lighting and heating, de-emphasized rote learning, and provided individual slates to each student—paid for by himself. Alcott had been influenced by educational philosophy of the Swiss pedagogue Johann Heinrich Pestalozzi and even renamed his school "The Cheshire Pestalozzi School". His style attracted the attention of Samuel Joseph May, who introduced Alcott to his sister Abby May. She called him, "an intelligent, philosophic, modest man" and found his views on education "very attractive". Locals in Cheshire were less supportive and became suspicious of his methods. Many students left and were enrolled in the local common school or a recently re-opened private school for boys. On November 6, 1827, Alcott started teaching in Bristol, Connecticut, still using the same methods he used in Cheshire, but opposition from the community surfaced quickly; he was unemployed by March 1828. He moved to Boston on April 24, 1828, and was immediately impressed, referring to the city as a place "where the light of the sun of righteousness has risen". He opened the Salem Street Infant School two months later on June 23. Abby May applied as his teaching assistant; instead, the couple were engaged, without consent of the family. They were married at King's Chapel on May 22, 1830; he was 30 years old and she was 29. Her brother conducted the ceremony and a modest reception followed at her father's house. After their marriage the Alcotts moved to 12 Franklin Street in Boston, a boarding house run by a Mrs. Newall. Around this time, Alcott also first expressed his public disdain for slavery. In November 1830, he and William Lloyd Garrison founded what he later called a "preliminary Anti-Slavery Society", though he differed from Garrison as a nonresistant. Alcott became a member of the Boston Vigilance Committee. Attendance at Alcott's school was falling when a wealthy Quaker named Reuben Haines III proposed that he and educator William Russell start a new school in Pennsylvania, associated with the Germantown Academy. Alcott accepted and he and his newly pregnant wife set forth on December 14. The school was established in Germantown and the Alcotts were offered a rent-free home by Haines. Alcott and Russell were initially concerned that the area would not be conducive to their progressive approach to education and considered establishing the school in nearby Philadelphia instead. Unsuccessful, they went back to Germantown, though the rent-free home was no longer available and the Alcotts instead had to rent rooms in a boarding-house. It was there that their first child, a daughter they named Anna Bronson Alcott, was born on March 16, 1831, after 36 hours of labor. By the fall of that year, their benefactor Haines died suddenly and the Alcotts again suffered financial difficulty. "We hardly earn the bread", wrote Abby May to her brother, "[and] the butter we have to think about." The couple's only son was born on April 6, 1839, but lived only a few minutes. The mother recorded: "Gave birth to a fine boy full grown perfectly formed but not living". It was in Germantown that the couple's second daughter was born. Louisa May Alcott was born on her father's birthday, November 29, 1832, at a half-hour past midnight. Bronson described her as "a very fine healthful child, much more so than Anna was at birth". The Germantown school, however, was faltering; soon only eight pupils remained. Their benefactor Haines died before Louisa's birth. He had helped recruit students and even paid tuition for some of them. As Abby wrote, his death "has prostrated all our hopes here". On April 10, 1833, the family moved to Philadelphia, where Alcott ran a day school. As usual, Alcott's methods were controversial; a former student later referred to him as "the most eccentric man who ever took on himself to train and form the youthful mind". Alcott began to believe Boston was the best place for his ideas to flourish. He contacted theologian William Ellery Channing for support. Channing approved of Alcott's methods and promised to help find students to enroll, including his daughter Mary. Channing also secured aid from Justice Lemuel Shaw and Boston mayor Josiah Quincy, Jr. Experimental educator On September 22, 1834, Alcott opened a school of about 30 students, mostly from wealthy families. It was named the Temple School because classes were held at the Masonic Temple on Tremont Street in Boston. His assistant was Elizabeth Palmer Peabody, later replaced by Margaret Fuller. Mary Peabody Mann served as a French instructor for a time. The school was briefly famous, and then infamous, because of his original methods. Before 1830, writing (except in higher education) equated to rote drills in the rules of grammar, spelling, vocabulary, penmanship and transcription of adult texts. However, in that decade, progressive reformers such as Alcott, influenced by Pestalozzi as well as Friedrich Fröbel and Johann Friedrich Herbart, began to advocate writing about subjects from students' personal experiences. Reformers debated against beginning instruction with rules and were in favor of helping students learn to write by expressing the personal meaning of events within their own lives. Alcott's plan was to develop self-instruction on the basis of self-analysis, with an emphasis on conversation and questioning rather than lecturing and drill, which were prevalent in the U.S. classrooms of the time. Alongside writing and reading, he gave lessons in "spiritual culture", which included interpretation of the Gospels, and advocated object teaching in writing instruction. He even went so far as to decorate his schoolroom with visual elements he thought would inspire learning: paintings, books, comfortable furniture, and busts or portraits of Plato, Socrates, Jesus, and William Ellery Channing. During this time, the Alcotts had another child. Born on June 24, 1835, she was named Elizabeth Peabody Alcott in honor of the teaching assistant at the Temple School. By age three, however, her mother changed her name to Elizabeth Sewall Alcott, after her own mother, perhaps because of the recent rupture between Bronson Alcott and Elizabeth Palmer Peabody. In July 1835, Peabody published her account as an assistant to the Temple School as Record of a School: Exemplifying the General Principles of Spiritual Culture. While working on a second book, Alcott and Peabody had a falling out and Conversations with Children on the Gospels was prepared with help from Peabody's sister Sophia, published at the end of December 1836. Alcott's methods were not well received; many found his conversations on the Gospels close to blasphemous. For example, he asked students to question if Biblical miracles were literal and suggested that all people are part of God. In the Boston Daily Advertiser, Nathan Hale criticized Alcott's "flippant and off hand conversation" about serious topics from the Virgin birth of Jesus to circumcision. Joseph T. Buckingham called Alcott "either insane or half-witted" and "an ignorant and presuming charlatan". The book did not sell well; a Boston lawyer bought 750 copies to use as waste paper. The temple school was widely denounced in the press. Reverend James Freeman Clarke was one of Alcott's few supporters and defended him against the harsh response from Boston periodicals. Alcott was rejected by most public opinion and, by the summer of 1837, he had only 11 students left and no assistant after Margaret Fuller moved to Providence, Rhode Island. The controversy had caused many parents to remove their children and, as the school closed, Alcott became increasingly financially desperate. Remaining steadfast to his pedagogy, a forerunner of progressive and democratic schooling, he alienated parents in a later "parlor school" by admitting an African American child to the class, whom he then refused to expel in the face of protests. Transcendentalism Beginning in 1836, Alcott's membership in the Transcendental Club put him in such company as Ralph Waldo Emerson, Orestes Brownson and Theodore Parker. He became a member with the club's second meeting and hosted their third. A biographer of Emerson described the group as "the occasional meetings of a changing body of liberal thinkers, agreeing in nothing but their liberality". Frederic Henry Hedge wrote of the group's nature: "There was no club in the strict sense ... only occasional meetings of like-minded men and women". Alcott preferred the term "Symposium" for their group. In late April 1840, Alcott moved to the town of Concord urged by Emerson. He rented a home for $50 a year within walking distance of Emerson's house; he named it Dove Cottage, though they also called it Concordia Cottage. A supporter of Alcott's philosophies, Emerson offered to help with his writing, which proved a difficult task. After several revisions, for example, he deemed the essay "Psyche" (Alcott's account of how he educated his daughters) unpublishable. Alcott also wrote a series patterned after the work of German writer Johann Wolfgang von Goethe which were eventually published in the Transcendentalists' journal, The Dial. Emerson wrote to Margaret Fuller, then editor, that they might "pass muster & even pass for just & great". He was wrong. Alcott's so-called "Orphic Sayings" were widely mocked for being silly and unintelligible; Fuller herself disliked them, but did not want to hurt Alcott's feelings. In the first issue, for example, he wrote: On July 26, 1840, Abby May gave birth again. Originally referred to as Baby for several months, she was eventually named Abby May after her mother. As a teenager, she changed the spelling of her name to "Abbie" before choosing to use only "May". With financial support from Emerson, Alcott left Concord on May 8, 1842, to a visit to England, leaving his brother Junius with his family. He met two admirers, Charles Lane and Henry C. Wright. The two men were leaders of Alcott House, an experimental school based on Alcott's methods from the Temple School located about ten miles outside London. The school's founder, James Pierpont Greaves, had only recently died but Alcott was invited to stay there for a week. Alcott persuaded them to come to the United States with him; Lane and his son moved into the Alcott house and helped with family chores. Persuaded in part by Lane's abolitionist views, Alcott took a stand against the John Tyler administration's plan to annex Texas as a slave territory and refused to pay his poll tax. Abby May wrote in her journal on January 17, 1843, "A day of some excitement, as Mr. Alcott refused to pay his town tax ... After waiting some time to be committed [to jail], he was told it was paid by a friend. Thus we were spared the affliction of his absence and the triumph of suffering for his principles." The annual poll tax was only $1.50. The incident inspired Henry David Thoreau, whose similar protest led to a night in jail and his essay "Civil Disobedience". Around this time, the Alcott family set up a sort of domestic post office to curb potential domestic tension. Abby May described her idea: "I thought it would afford a daily opportunity for the children, indeed all of us, to interchange thought and sentiment". Fruitlands Lane and Alcott collaborated on a major expansion of their educational theories into a Utopian society. Alcott, however, was still in debt and could not purchase the land needed for their planned community. In a letter, Lane wrote, "I do not see anyone to act the money part but myself." In May 1843, he purchased a farm in Harvard, Massachusetts. Up front, he paid $1,500 of the total $1,800 value of the property; the rest was meant to be paid by the Alcotts over a two-year period. They moved to the farm on June 1 and optimistically named it "Fruitlands" despite only ten old apple trees on the property. In July, Alcott announced their plans in The Dial: "We have made an arrangement with the proprietor of an estate of about a hundred acres, which liberates this tract from human ownership". Their goal was to regain access to Eden by finding the correct formula for perfect living, following specific rules governing agriculture, diet, and reproduction. In order to achieve this, they removed themselves from the economy as much as possible and lived independently; unlike a similar project named Brook Farm, the participants at Fruitlands avoided interaction with local communities. Calling themselves a "consociate family", they agreed to follow a strict vegetarian diet and to till the land without the use of animal labor. After some difficulty, they relented and allowed some cattle to be "enslaved". They also banned coffee, tea, alcoholic drinks, milk, and warm bathwater. They only ate "aspiring vegetables" — those which grew upward — and refused those that grew downward like potatoes. As Alcott had published earlier, "Our wine is water, — flesh, bread; — drugs, fruits." For clothing, they prohibited leather, because animals were killed for it, as well as cotton, silk, and wool, because they were products of slave labor. Alcott had high expectations, but was often away, attempting to recruit more members when the community most needed him. The experimental community was never successful, partly because most of the land was not arable. Alcott lamented, "None of us were prepared to actualize practically the ideal life of which we dreamed. So we fell apart". Its founders were often away as well; in the middle of harvesting, they left for a lecture tour through Providence, Rhode Island, New York City, and New Haven, Connecticut. In its seven months, only 13 people joined, included the Alcotts and Lanes. Other than Abby May and her daughters, only one other woman joined, Ann Page. One rumor is that Page was asked to leave after eating a fish tail with a neighbor. Lane believed Alcott had misled him into thinking enough people would join the enterprise and developed a strong dislike for the nuclear family. He

a realistic drawing of a spider can trigger intense fear. Reasons Arachnophobia may be an exaggerated form of an instinctive response that helped early humans to survive or a cultural phenomenon that is most common in predominantly European societies. Evolutionary An evolutionary reason for the phobia remains unresolved. One view, especially held in evolutionary psychology, is that the presence of venomous spiders led to the evolution of a fear of spiders, or made acquisition of a fear of spiders especially easy. Like all traits, there is variability in the intensity of fear of spiders, and those with more intense fears are classified as phobic. Being relatively small, spiders do not fit the usual criterion for a threat in the animal kingdom where size is a factor, but they can have medically significant venom and/or cause skin irritation with their setae. However, a phobia is an irrational fear as opposed to a rational fear. By ensuring that their surroundings were free from spiders, arachnophobes would have had a reduced risk of being bitten in ancestral environments, giving them a slight advantage over non-arachnophobes in terms of survival. However, having a disproportionate fear of spiders in comparison to other, potentially dangerous creatures present during Homo sapiens environment of evolutionary adaptiveness may have had drawbacks. In The Handbook of the Emotions (1993), psychologist Arne Öhman studied pairing an unconditioned stimulus with evolutionarily-relevant fear-response neutral stimuli (snakes and spiders) versus evolutionarily-irrelevant fear-response neutral stimuli (mushrooms, flowers, physical representation of polyhedra, firearms, and electrical outlets) on human subjects and found that ophidiophobia and arachnophobia required only one pairing to develop a conditioned response while mycophobia, anthophobia, phobias of physical representations of polyhedra, firearms, and electrical outlets required multiple pairings and went extinct without continued conditioning while the conditioned ophidiophobia and arachnophobia were permanent. Psychiatrist Randolph M. Nesse notes that while conditioned fear responses to evolutionarily novel dangerous objects such as electrical outlets is possible, the conditioning is slower because such cues have no prewired connection to fear, noting further that despite the emphasis of the risks of speeding and drunk driving in driver's education, it alone does not provide reliable protection against traffic collisions and that nearly one-quarter of all deaths in 2014 of people aged 15 to 24 in the United States were in traffic collisions. Nesse, psychiatrist Isaac Marks, and evolutionary biologist George C. Williams have noted that people with

cultural phenomenon that is most common in predominantly European societies. Evolutionary An evolutionary reason for the phobia remains unresolved. One view, especially held in evolutionary psychology, is that the presence of venomous spiders led to the evolution of a fear of spiders, or made acquisition of a fear of spiders especially easy. Like all traits, there is variability in the intensity of fear of spiders, and those with more intense fears are classified as phobic. Being relatively small, spiders do not fit the usual criterion for a threat in the animal kingdom where size is a factor, but they can have medically significant venom and/or cause skin irritation with their setae. However, a phobia is an irrational fear as opposed to a rational fear. By ensuring that their surroundings were free from spiders, arachnophobes would have had a reduced risk of being bitten in ancestral environments, giving them a slight advantage over non-arachnophobes in terms of survival. However, having a disproportionate fear of spiders in comparison to other, potentially dangerous creatures present during Homo sapiens environment of evolutionary adaptiveness may have had drawbacks. In The Handbook of the Emotions (1993), psychologist Arne Öhman studied pairing an unconditioned stimulus with evolutionarily-relevant fear-response neutral stimuli (snakes and spiders) versus evolutionarily-irrelevant fear-response neutral stimuli (mushrooms, flowers, physical representation of polyhedra, firearms, and electrical outlets) on human subjects and found that ophidiophobia and arachnophobia required only one pairing to develop a conditioned response while mycophobia, anthophobia, phobias of physical representations of polyhedra, firearms, and electrical outlets required multiple pairings and went extinct without continued conditioning while the conditioned ophidiophobia and arachnophobia were permanent. Psychiatrist Randolph M. Nesse notes that while conditioned fear responses to evolutionarily novel dangerous objects such as electrical outlets is possible, the conditioning is slower because such cues have no prewired connection to fear, noting further that despite the emphasis of the risks of speeding and drunk driving in driver's education, it alone does not provide reliable protection against traffic collisions and that nearly one-quarter of all deaths in 2014 of people aged 15 to 24 in the United States were in traffic collisions. Nesse, psychiatrist Isaac Marks, and evolutionary biologist George C. Williams have noted that people with systematically deficient responses to various adaptive phobias (e.g. arachnophobia, ophidiophobia, basophobia) are

hardness 1.5 to 2) is so soft that a fingernail scratches it, while calcite (Mohs hardness 3) cannot be scratched in this way but yields to a knife. Moreover, calcite alabaster, being a carbonate, effervesces when treated with hydrochloric acid, while gypsum alabaster remains almost unaffected. Etymology The origin of "alabaster" is in Middle English through Old French "alabastre", in turn derived from Latin "alabaster", and that from Greek "ἀλάβαστρος" ("alabastros") or "ἀλάβαστος" ("alabastos"). The Greek words denoted a vase of alabaster. The name may be derived further from ancient Egyptian "a-labaste", which refers to vessels of the Egyptian goddess Bast. She was represented as a lioness and frequently depicted as such in figures placed atop these alabaster vessels. Ancient Roman authors, Pliny the Elder and Ptolemy, wrote that the stone used for ointment jars called alabastra came from a region of Egypt known as Alabastron or Alabastrites. Properties and usability The purest alabaster is a snow-white material of fine uniform grain, but it often is associated with an oxide of iron, which produces brown clouding and veining in the stone. The coarser varieties of gypsum alabaster are converted by calcination into plaster of Paris, and are sometimes known as "plaster stone". The softness of alabaster enables it to be carved readily into elaborate forms, but its solubility in water renders it unsuitable for outdoor work. If alabaster with a smooth, polished surface is washed with dishwashing liquid, it will become rough, dull and whiter, losing most of its translucency and lustre. The finer kinds of alabaster are employed largely as an ornamental stone, especially for ecclesiastical decoration and for the rails of staircases and halls. Modern processing Working techniques Alabaster is mined and then sold in blocks to alabaster workshops. There they are cut to the needed size ("squaring"), and then are processed in different techniques: turned on a lathe for round shapes, carved into three-dimensional sculptures, chiselled to produce low relief figures or decoration; and then given an elaborate finish that reveals its transparency, colour, and texture. Marble imitation In order to diminish the translucency of the alabaster and to produce an opacity suggestive of true marble, the statues are immersed in a bath of water and heated gradually—nearly to the boiling point—an operation requiring great care, because if the temperature is not regulated carefully, the stone acquires a dead-white, chalky appearance. The effect of heating appears to be a partial dehydration of the gypsum. If properly treated, it very closely resembles true marble and is known as "marmo di Castellina". Dyeing Alabaster is a porous stone and can be "dyed" into any colour or shade, a technique used for centuries. For this the stone needs to be fully immersed in various pigmentary solutions and heated to a specific temperature. The technique can be used to disguise alabaster. In this way a very misleading imitation of coral that is called "alabaster coral" is produced. Types, occurrence, history Typically only one type is sculpted in any particular cultural environment, but sometimes both have been worked to make similar pieces in the same place and time. This was the case with small flasks of the alabastron type made in Cyprus from the Bronze Age into the Classical period. Window panels When cut in thin sheets, alabaster is translucent enough to be used for small windows. It was used for this purpose in Byzantine churches and later in medieval ones, especially in Italy. Large sheets of Aragonese gypsum alabaster are used extensively in the contemporary Cathedral of Our Lady of the Angels, which was dedicated in 2002 by the Los Angeles, California Archdiocese. The cathedral incorporates special cooling to prevent the panes from overheating and turning opaque. The ancients used the calcite type, while the modern Los Angeles cathedral is using gypsum alabaster. There are also multiple examples of alabaster windows in ordinary village churches and monasteries in northern Spain. Calcite alabaster Calcite alabaster, harder than the gypsum variety, was the kind primarily used in ancient Egypt and the wider Middle East (but not Assyrian palace reliefs), and is also used in modern times. It is found as either a stalagmitic deposit from the floor and walls of limestone caverns, or as a kind of travertine, similarly deposited in springs of calcareous water. Its deposition in successive layers gives rise to the banded appearance that the marble often shows on cross-section, from which its name is derived: onyx-marble or alabaster-onyx, or sometimes simply (and wrongly) as onyx. Egypt and the Middle East Egyptian alabaster has been worked extensively near Suez and Assiut. This stone variety is the "alabaster" of the ancient Egyptians and Bible and is often termed Oriental alabaster, since the early examples came from the

and monasteries in northern Spain. Calcite alabaster Calcite alabaster, harder than the gypsum variety, was the kind primarily used in ancient Egypt and the wider Middle East (but not Assyrian palace reliefs), and is also used in modern times. It is found as either a stalagmitic deposit from the floor and walls of limestone caverns, or as a kind of travertine, similarly deposited in springs of calcareous water. Its deposition in successive layers gives rise to the banded appearance that the marble often shows on cross-section, from which its name is derived: onyx-marble or alabaster-onyx, or sometimes simply (and wrongly) as onyx. Egypt and the Middle East Egyptian alabaster has been worked extensively near Suez and Assiut. This stone variety is the "alabaster" of the ancient Egyptians and Bible and is often termed Oriental alabaster, since the early examples came from the Far East. The Greek name alabastrites is said to be derived from the town of Alabastron in Egypt, where the stone was quarried. The locality probably owed its name to the mineral; the origin of the mineral name is obscure (though see above). The "Oriental" alabaster was highly esteemed for making small perfume bottles or ointment vases called alabastra; the vessel name has been suggested as a possible source of the mineral name. In Egypt, craftsmen used alabaster for canopic jars and various other sacred and sepulchral objects. A sarcophagus discovered in the tomb of Seti I near Thebes is on display in Sir John Soane's Museum, London; it is carved in a single block of translucent calcite alabaster from Alabastron. Algerian onyx-marble has been quarried largely in the province of Oran. North America In Mexico, there are famous deposits of a delicate green variety at La Pedrara, in the district of Tecali, near Puebla. Onyx-marble occurs also in the district of Tehuacán and at several localities in the US including California, Arizona, Utah, Colorado and Virginia. Gypsum alabaster Gypsum alabaster is the softer of the two varieties, the other being calcite alabaster. It was used primarily in medieval Europe, and is also used in modern times. Ancient and Classical Near East "Mosul marble" is a kind of gypsum alabaster found in the north of modern Iraq, which was used for the Assyrian palace reliefs of the 9th to 7th centuries BC; these are the largest type of alabaster sculptures to have been regularly made. The relief is very low and the carving detailed, but large rooms were lined with continuous compositions on slabs around high. The Lion Hunt of Ashurbanipal and military Lachish reliefs, both 7th century and in the British Museum, are some of the best known. Gypsum alabaster was widely used for small sculpture for indoor use in the ancient world, especially in ancient Egypt and Mesopotamia. Fine detail could be obtained in a material with an attractive finish without iron or steel tools. Alabaster was used for vessels dedicated for use in the cult of the deity Bast in the culture of the ancient Egyptians, and thousands of gypsum alabaster artifacts dating to the late 4th millennium BC also have been found in Tell Brak (present day Nagar), in Syria. In Mesopotamia, gypsum alabaster was the material of choice for figures of deities and devotees in temples, as in a figure believed to represent the deity Abu dating to the first half of the 3rd millennium BC and currently kept in New York. Aragon, Spain Much of the world's alabaster extraction is performed in the centre of the Ebro Valley in Aragon, Spain, which has the world's largest known exploitable deposits. According to a brochure published by the Aragon government, alabaster has elsewhere either been depleted, or its extraction is so difficult that it has almost been abandoned or is carried out at a very high cost. There are two separate sites in Aragon, both are located in Tertiary basins. The most important site is the Fuentes-Azaila area, in the Tertiary Ebro Basin. The other is the Calatayud-Teruel Basin, which divides the Iberian Range in two main sectors (NW and SE). The abundance of Aragonese alabaster was crucial for its use in architecture, sculpture and decoration. There is no record of likely use by pre-Roman cultures, so perhaps the first ones to use alabaster in Aragon were the Romans, who produced vessels from alabaster following the Greek and Egyptian models. It seems that since the reconstruction of the Roman Wall in Zaragoza in the 3rd century AD with alabaster, the use of this material became common in building for centuries. Muslim Saraqusta (today, Zaragoza) was also called "Medina Albaida", the White City, due to the appearance of its alabaster walls and palaces, which stood out among gardens, groves and orchards by the Ebro and Huerva Rivers. The oldest remains in the Aljafería Palace, together with other interesting elements like capitals, reliefs and inscriptions, were made using alabaster, but it was during the artistic and economic blossoming of the Renaissance that Aragonese alabaster reached its golden age. In the 16th century sculptors in Aragon chose alabaster for their best works. They were adept at exploiting its lighting qualities and generally speaking the finished art pieces retained their natural color. Volterra (Tuscany) In Europe, the centre of the alabaster trade today is Florence, Italy. Tuscan alabaster occurs in nodular masses embedded in limestone, interstratified with marls of Miocene and Pliocene age. The mineral is worked largely by means of underground galleries, in the district of Volterra. Several varieties are recognized—veined, spotted, clouded, agatiform, and others. The finest kind, obtained principally from Castellina, is sent to Florence for figure-sculpture, while the common kinds are carved locally, into vases, lights, and various ornamental objects. These items are objects of extensive trade, especially in Florence, Pisa, and Livorno. In the 3rd century BC the Etruscans used the alabaster of Tuscany from the area of modern-day Volterra to produce funeral urns, possibly taught by Greek artists. During the Middle Ages the craft of alabaster was almost completely forgotten. A revival started in the mid-16th century, and until the beginning of the 17th century alabaster work was strictly artistic and did not expand to form a large industry. In the 17th and 18th centuries production of artistic, high-quality Renaissance-style artifacts stopped altogether, being replaced by less sophisticated, cheaper items better suited for large-scale production and commerce. The new industry prospered, but the reduced need of skilled craftsmen left only few still working. The 19th century brought a boom to the industry, largely due to the "traveling artisans" who went and offered their wares to the palaces of Europe, as well as to America and the East. In the 19th century new processing technology was also introduced, allowing for the production of custom-made, unique pieces, as well as the combination of alabaster with other materials. Apart from the newly developed craft, artistic work became again possible, chiefly by Volterran sculptor Albino Funaioli. After a short slump, the industry was revived again by the sale of mass-produced mannerist Expressionist sculptures, and was further enhanced in the 1920s by a new branch creating ceiling and wall lamps in the Art Deco style and culminating in the participation at the 1925 International Exposition of Modern Industrial and Decorative Arts from Paris. Important names from the evolution of alabaster use after World War II are Volterran Umberto Borgna, the "first alabaster designer", and later on the architect and industrial designer Angelo Mangiarotti. England and Wales Gypsum alabaster is a common mineral, which occurs in England in the Keuper marls of the Midlands, especially at Chellaston in Derbyshire, at Fauld in Staffordshire, and near Newark in Nottinghamshire. Deposits at all of these localities have been worked extensively. In the 14th and 15th centuries its carving into small statues and sets of relief panels for altarpieces was a valuable local industry in Nottingham, as well as a major English export. These were usually painted, or partly painted. It was also used for the effigies, often life size, on tomb monuments, as the typical recumbent position suited the material's lack of strength, and it was cheaper and easier to work than good marble. After

an unaimed arrow. The Hebrew Bible says that dogs licked his blood, according to the prophecy of Elijah. But the Septuagint adds that pigs also licked his blood, symbolically making him unclean to the Israelites, who abstained from pork. Ahab was succeeded by his sons, Ahaziah and Jehoram. Jezebel's death, however, was more dramatic than Ahab's. As recorded in , Jehu had her servants throw Jezebel out of a window, causing her death. Legacy 1 Kings 16:29 through 22:40 contains the narrative of Ahab's reign. His reign was slightly more emphasised upon than the previous kings, due to his blatant trivialization of the "sins of Jeroboam", which the previous kings of Israel were plagued by, and his subsequent marriage with a pagan princess, the nationwide institution of Baal worship, the persecution of Yahweh's prophets and Naboth's shocking murder. These offenses and atrocities stirred up populist resentment from figures such as Elijah and Micaiah. Indeed, he is referred to by the author of Kings as being "more evil than all the kings before him". Nonetheless, there were achievements that the author took note of, including his ability to fortify numerous Israelite cities and build an ivory palace. Adherents of the Yahwist religion found their principal champion in Elijah. His denunciation of the royal dynasty of Israel and his emphatic insistence on the worship of Yahweh and Yahweh alone, illustrated by the contest between Yahweh and Baal on Mount Carmel, form the keynote to a period which culminated in the accession of Jehu, an event in which Elijah's chosen disciple Elisha was the leading figure and the Omride Dynasty was brutally defeated. In Rabbinic literature One of the three or four wicked kings of Israel singled out by tradition as being excluded from the future world of bliss (Sanh. x. 2; Tosef., Sanh. xii. 11). Midrash Konen places him in the fifth department of Gehenna, as having the heathen under his charge. Though held up as a warning to sinners, Ahab is also described as displaying noble traits of character (Sanh. 102b; Yer. Sanh. xi. 29b). Talmudic literature represents him as an enthusiastic idolater who left no hilltop in Eretz Israel without an idol before which he bowed, and to which he or his wife, Jezebel, brought his weight in gold as a daily offering. So defiant in his apostasy was he that he had inscribed on all the doors of the city of Samaria the words, "Ahab hath abjured the living God of Israel." Nevertheless, he paid great respect to the representatives of learning, "to the Torah given in twenty-two letters," for which reason he was permitted to reign for twenty-two successive years. He generously supported the students of the Law out of his royal treasury, in consequence of which half his sins were forgiven him. A type of worldliness (Ber. 61b), the Crœsus of his time, he was, according to ancient tradition (Meg. 11a), ruler over the whole world. Two hundred and thirty subject kings had initiated a rebellion; but he brought their sons as hostages to Samaria and Jerusalem. All the latter turned from idolaters into worshipers of the God of Israel (Tanna debe Eliyahu, i. 9). Each of

including Ahab the Israelite (A-ha-ab-bu matSir-'a-la-a-a) and Hadadezer (Adad-'idri). Ahab's contribution was estimated at 2000 chariots and 10,000 men. In reality, however, the number of chariots in Ahab's forces was probably closer to a number in the hundreds (based upon archaeological excavations of the area and the foundations of stables that have been found). If, however, the numbers are referring to allies, they could possibly include forces from Tyre, Judah, Edom, and Moab. The Assyrian king claimed a victory, but his immediate return and subsequent expeditions in 849 BC and 846 BC against a similar but unspecified coalition seem to show that he met with no lasting success. Jezreel has been identified as Ahab's fortified chariot and cavalry base. Ahab and the prophets In the Biblical text, Ahab has five important encounters with prophets: The first encounter is with Elijah, who predicts a drought because of Ahab's sins. Because of this, Ahab refers to him as "the troubler of Israel" (1 Kings 18:17). This encounter ends with Elijah's victory over the prophets of Baal in a contest held for the sake of Ahab and the Israelites, to bring them into repentance. The second encounter is between Ahab and an unnamed prophet in . The third is again between Ahab and an unnamed prophet who condemns Ahab for his actions in a battle that had just taken place. The fourth is when Elijah confronts Ahab over his role in the unjust execution of Naboth and usurpation of the latter's ancestral vineyard. Upon the prophet's remonstration ("Hast thou killed and also taken possession?"), Ahab sincerely repented, which God relays to Elijah. The fifth encounter is with Micaiah, the prophet who, when asked for advice to recapturing Ramoth-Gilead, sarcastically assures Ahab that he will be successful. Micaiah ultimately tells him the truth of God's plan to kill Ahab in battle, due to his reliance on the false prophets, who were empowered by a deceiving spirit. Death of Ahab After some years, Ahab with Jehoshaphat of Judah went to recover Ramoth-Gilead from the Arameans. During this battle, Ahab disguised himself, but he was mortally wounded by an unaimed arrow. The Hebrew Bible says that dogs licked his blood, according to the prophecy of Elijah. But the Septuagint adds that pigs also licked his blood, symbolically making him unclean to the Israelites, who abstained from pork. Ahab was succeeded by his sons, Ahaziah and Jehoram. Jezebel's death, however, was more dramatic than Ahab's. As recorded in , Jehu had her servants throw Jezebel out of a window, causing her death. Legacy 1 Kings 16:29 through 22:40 contains the narrative of Ahab's reign. His reign was slightly more emphasised upon than the previous kings, due to his blatant trivialization of the "sins of Jeroboam", which the previous kings of Israel were plagued by, and his subsequent marriage with a pagan princess, the nationwide institution of Baal worship, the persecution of Yahweh's prophets and Naboth's shocking murder. These offenses and atrocities stirred up populist resentment from figures such as Elijah and Micaiah. Indeed, he is referred to by the author of Kings as being "more evil than all the kings before him". Nonetheless, there were achievements that the author took note of, including his ability to fortify numerous Israelite cities and build an

integrated circuit". An ASIC is an integrated circuit developed for a particular use, as opposed to a general-purpose integrated circuit. ASIC may also refer to: Accreditation Service for International Colleges, an educational accreditation agency in the UK Acid-sensing ion channels, a protein family Air and Space Interoperability Council Arfoire Syndicate of International Crime, the antagonist group in the video game Hyperdimension Neptunia Mk2 ASIC programming language, a dialect of BASIC Associated

ion channels, a protein family Air and Space Interoperability Council Arfoire Syndicate of International Crime, the antagonist group in the video game Hyperdimension Neptunia Mk2 ASIC programming language, a dialect of BASIC Associated Signature Containers (ASiC) specifies the use of container structures to bind together one or more signed objects with either advanced electronic signatures or time-stamp tokens into one single digital container. Association Scientifique Internationale pour le Café, see

above, with a paler underside. They are herbivorous, often feeding on ripe fruit that falls from trees. They live in burrows, and, like squirrels, will bury some of their food for later use. Dasyproctids exist in Central and South America, which are the tropical parts of the New World. The fossil record of this family can be traced back to the Late Oligocene (Deseadan in the SALMA classification). As with all rodents, members of this family have incisors, pre-molars, and molars, but no canines. The cheek teeth

feeding on ripe fruit that falls from trees. They live in burrows, and, like squirrels, will bury some of their food for later use. Dasyproctids exist in Central and South America, which are the tropical parts of the New World. The fossil record of this family can be traced back to the Late Oligocene (Deseadan in the SALMA classification). As with all rodents, members of this family have incisors, pre-molars, and molars, but no canines. The cheek teeth are hypsodont and flat-crowned. Classification Fossil taxa follow McKenna and Bell, with modifications following Kramarz. Family Dasyproctidae Genus †Alloiomys Genus †Australoprocta Genus †Branisamys Genus †Incamys Genus †Neoreomys Genus †Megastus Genus †Palmiramys Genus Dasyprocta Azara's agouti, D. azarae Coiban agouti, D. coibae Crested agouti, D. cristata Black

the hot luminous primary β Persei Aa1 and the larger, but cooler and fainter, β Persei Aa2 regularly pass in front of each other, causing eclipses. Thus Algol's magnitude is usually near-constant at 2.1, but regularly dips to 3.4 every 2.86 days during the roughly 10-hour-long partial eclipses. The secondary eclipse when the brighter primary star occults the fainter secondary is very shallow and can only be detected photoelectrically. Algol gives its name to its class of eclipsing variable, known as Algol variables. Observation history An ancient Egyptian calendar of lucky and unlucky days composed some 3,200 years ago is said to be the oldest historical documentation of the discovery of Algol. The association of Algol with a demon-like creature (Gorgon in the Greek tradition, ghoul in the Arabic tradition) suggests that its variability was known long before the 17th century, but there is still no indisputable evidence for this. The Arabic astronomer al-Sufi said nothing about any variability of the star in his Book of Fixed Stars published c.964. The variability of Algol was noted in 1667 by Italian astronomer Geminiano Montanari, but the periodic nature of its variations in brightness was not recognized until more than a century later, when the British amateur astronomer John Goodricke also proposed a mechanism for the star's variability. In May 1783, he presented his findings to the Royal Society, suggesting that the periodic variability was caused by a dark body passing in front of the star (or else that the star itself has a darker region that is periodically turned toward the Earth). For his report he was awarded the Copley Medal. In 1881, the Harvard astronomer Edward Charles Pickering presented evidence that Algol was actually an eclipsing binary. This was confirmed a few years later, in 1889, when the Potsdam astronomer Hermann Carl Vogel found periodic doppler shifts in the spectrum of Algol, inferring variations in the radial velocity of this binary system. Thus Algol became one of the first known spectroscopic binaries. Joel Stebbins at the University of Illinois Observatory used an early selenium cell photometer to produce the first-ever photoelectric study of a variable star. The light curve revealed the second minimum and the reflection effect between the two stars. Some difficulties in explaining the observed spectroscopic features led to the conjecture that a third star may be present in the system; four decades later this conjecture was found to be correct. Listed are the first eclipse dates and times of each month; all times in UT. β Persei Aa2 eclipses β Persei Aa1 every 2.867321 days (2 days 20 hours 49 min); therefore keep adding that much to each date and time to get the following eclipses. For example, the Jan 3, 21h, eclipse will yield consecutive eclipse times on Jan 6, 18h, then Jan 9, 15h, then Jan 12, 12h, etc. (all times approximate). System Algol is a multiple-star system with three confirmed and two suspected stellar components. From the point of view of the Earth, Algol Aa1 and Algol Aa2 form an eclipsing binary because their orbital plane contains the line of sight to the Earth. The eclipsing binary pair is separated by only 0.062 astronomical units (au) from each other, whereas the third star in the system (Algol Ab) is at an average distance of 2.69 au from the pair, and the mutual orbital period of the trio is 681 Earth days. The total mass of the system is about 5.8 solar masses, and the mass ratios of Aa1, Aa2, and Ab are about 4.5 to 1 to 2. The three components of the bright triple star used to be, and still sometimes are, referred to as β Per A, B, and C. The Washington Double Star Catalog lists them as Aa1, Aa2, and Ab, with two very faint stars B and C about one arcmin distant. A further five faint stars are also listed as companions. Studies of Algol led to the Algol paradox in the theory of stellar evolution: although components of a binary star form at the same time, and massive stars evolve much faster than the less massive stars, the more massive component Algol Aa1 is still in

a mechanism for the star's variability. In May 1783, he presented his findings to the Royal Society, suggesting that the periodic variability was caused by a dark body passing in front of the star (or else that the star itself has a darker region that is periodically turned toward the Earth). For his report he was awarded the Copley Medal. In 1881, the Harvard astronomer Edward Charles Pickering presented evidence that Algol was actually an eclipsing binary. This was confirmed a few years later, in 1889, when the Potsdam astronomer Hermann Carl Vogel found periodic doppler shifts in the spectrum of Algol, inferring variations in the radial velocity of this binary system. Thus Algol became one of the first known spectroscopic binaries. Joel Stebbins at the University of Illinois Observatory used an early selenium cell photometer to produce the first-ever photoelectric study of a variable star. The light curve revealed the second minimum and the reflection effect between the two stars. Some difficulties in explaining the observed spectroscopic features led to the conjecture that a third star may be present in the system; four decades later this conjecture was found to be correct. Listed are the first eclipse dates and times of each month; all times in UT. β Persei Aa2 eclipses β Persei Aa1 every 2.867321 days (2 days 20 hours 49 min); therefore keep adding that much to each date and time to get the following eclipses. For example, the Jan 3, 21h, eclipse will yield consecutive eclipse times on Jan 6, 18h, then Jan 9, 15h, then Jan 12, 12h, etc. (all times approximate). System Algol is a multiple-star system with three confirmed and two suspected stellar components. From the point of view of the Earth, Algol Aa1 and Algol Aa2 form an eclipsing binary because their orbital plane contains the line of sight to the Earth. The eclipsing binary pair is separated by only 0.062 astronomical units (au) from each other, whereas the third star in the system (Algol Ab) is at an average distance of 2.69 au from the pair, and the mutual orbital period of the trio is 681 Earth days. The total mass of the system is about 5.8 solar masses, and the mass ratios of Aa1, Aa2, and Ab are about 4.5 to 1 to 2. The three components of the bright triple star used to be, and still sometimes are, referred to as β Per A, B, and C. The Washington Double Star Catalog lists them as Aa1, Aa2, and Ab, with two very faint stars B and C about one arcmin distant. A further five faint stars are also listed as companions. Studies of Algol led to the Algol paradox in the theory of stellar evolution: although components of a binary star form at the same time, and massive stars evolve much faster than the less massive stars, the more massive component Algol Aa1 is still in the main sequence, but the less massive Algol Aa2 is a subgiant star at a later evolutionary stage. The paradox can be solved by mass transfer: when the more massive star became a subgiant, it filled