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https://en.wikipedia.org/wiki/Anarchism

Anarchism

Criticism

Anarchism is a political philosophy and movement that is skeptical of all justifications for authority and seeks to abolish the institutions they claim maintain unnecessary coercion and hierarchy, typically including, though not necessarily limited to, governments, nation states, and capitalism. Anarchism advocates for the replacement of the state with stateless societies or other forms of free associations. As a historically left-wing movement, usually placed on the farthest left of the political spectrum, it is usually described alongside communalism and libertarian Marxism as the libertarian wing (libertarian socialism) of the socialist movement. Humans lived in societies without formal hierarchies long before the establishment of formal states, realms, or empires. With the rise of organised hierarchical bodies, scepticism toward authority also rose. Although traces of anarchist thought are found throughout history, modern anarchism emerged from the Enlightenment. During the latter half of the 19th and the first decades of the 20th century, the anarchist movement flourished in most parts of the world and had a significant role in workers' struggles for emancipation. Various anarchist schools of thought formed during this period. Anarchists have taken part in several revolutions, most notably in the Paris Commune, the Russian Civil War and the Spanish Civil War, whose end marked the end of the classical era of anarchism. In the last decades of the 20th and into the 21st century, the anarchist movement has been resurgent once more, growing in popularity and influence within anti-capitalist, anti-war and anti-globalisation movements. Anarchism employs a diversity of tactics in order to meet its ideal ends which can be broadly separated into revolutionary and evolutionary tactics; there is significant overlap between the two, which are merely descriptive. Revolutionary tactics aim to bring down authority and state, having taken a violent turn in the past, while evolutionary tactics aim to prefigure what an anarchist society would be like. Anarchist thought, criticism, and praxis have played a part in diverse areas of human society.

The most common critique of anarchism is that humans cannot self-govern and so a state is necessary for human survival. Philosopher Bertrand Russell supported this critique, stating that "[p]eace and war, tariffs, regulations of sanitary conditions and the sale of noxious drugs, the preservation of a just system of distribution: these, among others, are functions which could hardly be performed in a community in which there was no central government." Another common criticism of anarchism is that it fits a world of isolation in which only the small enough entities can be self-governing; a response would be that major anarchist thinkers advocated anarchist federalism. Philosophy lecturer Andrew G. Fiala composed a list of common arguments against anarchism which includes critiques such as that anarchism is innately related to violence and destruction, not only in the pragmatic world, such as at protests, but in the world of ethics as well. Secondly, anarchism is evaluated as unfeasible or utopian since the state cannot be defeated practically. This line of arguments most often calls for political action within the system to reform it. The third argument is that anarchism is self-contradictory as a ruling theory that has no ruling theory. Anarchism also calls for collective action whilst endorsing the autonomy of the individual, hence no collective action can be taken. Lastly, Fiala mentions a critique towards philosophical anarchism of being ineffective (all talk and thoughts) and in the meantime capitalism and bourgeois class remains strong. Philosophical anarchism has met the criticism of members of academia following the release of pro-anarchist books such as A. John Simmons' Moral Principles and Political Obligations. Law professor William A. Edmundson authored an essay to argue against three major philosophical anarchist principles which he finds fallacious. Edmundson says that while the individual does not owe the state a duty of obedience, this does not imply that anarchism is the inevitable conclusion and the state is still morally legitimate. In The Problem of Political Authority, Michael Huemer defends philosophical anarchism, claiming that "political authority is a moral illusion." One of the earliest criticisms is that anarchism defies and fails to understand the biological inclination to authority. Joseph Raz states that the acceptance of authority implies the belief that following their instructions will afford more success. Raz believes that this argument is true in following both authorities' successful and mistaken instruction. Anarchists reject this criticism because challenging or disobeying authority does not entail the disappearance of its advantages by acknowledging authority such as doctors or lawyers as reliable, nor does it involve a complete surrender of independent judgment. Anarchist perception of human nature, rejection of the state, and commitment to social revolution has been criticised by academics as naive, overly simplistic, and unrealistic, respectively. Classical anarchism has been criticised for relying too heavily on the belief that the abolition of the state will lead to human cooperation prospering. Friedrich Engels, considered to be one of the principal founders of Marxism, criticised anarchism's anti-authoritarianism as inherently counter-revolutionary because in his view a revolution is by itself authoritarian. Academic John Molyneux writes in his book Anarchism: A Marxist Criticism that "anarchism cannot win", believing that it lacks the ability to properly implement its ideas. The Marxist criticism of anarchism is that it has a utopian character because all individuals should have anarchist views and values. According to the Marxist view, that a social idea would follow directly from this human ideal and out of the free will of every individual formed its essence. Marxists state that this contradiction was responsible for their inability to act. In the anarchist vision, the conflict between liberty and equality was resolved through coexistence and intertwining.

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https://en.wikipedia.org/wiki/Anthropology

Anthropology

Etymology

Anthropology is the scientific study of humanity, concerned with human behavior, human biology, cultures, societies, and linguistics, in both the present and past, including past human species. Social anthropology studies patterns of behavior, while cultural anthropology studies cultural meaning, including norms and values. A portmanteau term sociocultural anthropology is commonly used today. Linguistic anthropology studies how language influences social life. Biological or physical anthropology studies the biological development of humans. Archaeological anthropology, often termed as 'anthropology of the past', studies human activity through investigation of physical evidence. It is considered a branch of anthropology in North America and Asia, while in Europe archaeology is viewed as a discipline in its own right or grouped under other related disciplines, such as history and palaeontology.

The abstract noun anthropology is first attested in reference to history. Its present use first appeared in Renaissance Germany in the works of Magnus Hundt and Otto Casmann. Their New Latin derived from the combining forms of the Greek words ánthrōpos (, "human") and lógos (, "study"). (Its adjectival form appeared in the works of Aristotle.) It began to be used in English, possibly via French , by the early 18th century.

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https://en.wikipedia.org/wiki/Alphabet

Alphabet

Etymology

An alphabet is a standardized set of basic written symbols or graphemes (called letters) that represent the phonemes of certain spoken languages. Not all writing systems represent language in this way; in a syllabary, each character represents a syllable, for instance, and logographic systems use characters to represent words, morphemes, or other semantic units. The first fully phonemic script, the Proto-Canaanite script, later known as the Phoenician alphabet, is considered to be the first alphabet and is the ancestor of most modern alphabets, including Arabic, Cyrillic, Greek, Hebrew, Latin, and possibly Brahmic. It was created by Semitic-speaking workers and slaves in the Sinai Peninsula (as the Proto-Sinaitic script), by selecting a small number of hieroglyphs commonly seen in their Egyptian surroundings to describe the sounds, as opposed to the semantic values, of the Canaanite language. However, Peter T. Daniels distinguishes an abugida, or alphasyllabary, a set of graphemes that represent consonantal base letters that diacritics modify to represent vowels (as in Devanagari and other South Asian scripts), an abjad, in which letters predominantly or exclusively represent consonants (as in the original Phoenician, Hebrew or Arabic), and an "alphabet", a set of graphemes that represent both consonants and vowels. In this narrow sense of the word, the first true alphabet was the Greek alphabet, which was based on the earlier Phoenician alphabet. Of the dozens of alphabets in use today, the most popular is the Latin alphabet, which was derived from the Greek alphabet, and which is now used by many languages worldwide, often with the addition of extra letters or diacritical marks. While most alphabets have letters composed of lines (linear writing), there are also exceptions such as the alphabets used in Braille. The Khmer alphabet (for Khmer) is the longest, with 74 letters. Alphabets are usually associated with a standard ordering of letters. This makes them useful for purposes of collation, specifically by allowing words to be sorted in alphabetical order. It also means that their letters can be used as an alternative method of "numbering" ordered items, in such contexts as numbered lists and number placements.

The English word alphabet came into Middle English from the Late Latin word alphabetum, which in turn originated in the Greek ἀλφάβητος (alphabētos), was made from the first two letters, alpha (α) and beta (β). The names for the Greek letters came from the first two letters of the Phoenician alphabet; aleph, which also meant ox, and bet, which also meant house. Sometimes, like in the alphabet song in English, the term "ABCs" is used instead of the word "alphabet." "Knowing one's ABCs" is used as a metaphor for knowing the basics about anything.

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https://en.wikipedia.org/wiki/Algorithm

Algorithm

History

In mathematics and computer science, an algorithm () is a finite sequence of rigorous instructions, typically used to solve a class of specific problems or to perform a computation. Algorithms are used as specifications for performing calculations and data processing. More advanced algorithms can perform automated deductions (referred to as automated reasoning) and use mathematical and logical tests to divert the code execution through various routes (referred to as automated decision-making). Using human characteristics as descriptors of machines in metaphorical ways was already practiced by Alan Turing with terms such as "memory", "search" and "stimulus". In contrast, a heuristic is an approach to problem solving that may not be fully specified or may not guarantee correct or optimal results, especially in problem domains where there is no well-defined correct or optimal result. As an effective method, an algorithm can be expressed within a finite amount of space and time, and in a well-defined formal language for calculating a function. Starting from an initial state and initial input (perhaps empty), the instructions describe a computation that, when executed, proceeds through a finite number of well-defined successive states, eventually producing "output" and terminating at a final ending state. The transition from one state to the next is not necessarily deterministic; some algorithms, known as randomized algorithms, incorporate random input.

The concept of algorithm has existed since antiquity. Arithmetic algorithms, such as a division algorithm, were used by ancient Babylonian mathematicians c. 2500 BC and Egyptian mathematicians c. 1550 BC. Greek mathematicians later used algorithms in 240 BC in the sieve of Eratosthenes for finding prime numbers, and the Euclidean algorithm for finding the greatest common divisor of two numbers. Arabic mathematicians such as al-Kindi in the 9th century used cryptographic algorithms for code-breaking, based on frequency analysis. The word algorithm is derived from the name of the 9th-century Persian mathematician Muḥammad ibn Mūsā al-Khwārizmī, whose nisba (identifying him as from Khwarazm) was Latinized as Algoritmi (Arabized Persian الخوارزمی c. 780–850). Muḥammad ibn Mūsā al-Khwārizmī was a mathematician, astronomer, geographer, and scholar in the House of Wisdom in Baghdad, whose name means 'the native of Khwarazm', a region that was part of Greater Iran and is now in Uzbekistan. About 825, al-Khwarizmi wrote an Arabic language treatise on the Hindu–Arabic numeral system, which was translated into Latin during the 12th century. The manuscript starts with the phrase Dixit Algorizmi ('Thus spake Al-Khwarizmi'), where "Algorizmi" was the translator's Latinization of Al-Khwarizmi's name. Al-Khwarizmi was the most widely read mathematician in Europe in the late Middle Ages, primarily through another of his books, the Algebra. In late medieval Latin, algorismus, English 'algorism', the corruption of his name, simply meant the "decimal number system". In the 15th century, under the influence of the Greek word ἀριθμός (arithmos), 'number' (cf. 'arithmetic'), the Latin word was altered to algorithmus, and the corresponding English term 'algorithm' is first attested in the 17th century; the modern sense was introduced in the 19th century. Indian mathematics was predominantly algorithmic. Algorithms that are representative of the Indian mathematical tradition range from the ancient Śulbasūtrās to the medieval texts of the Kerala School. In English, the word algorithm was first used in about 1230 and then by Chaucer in 1391. English adopted the French term, but it was not until the late 19th century that "algorithm" took on the meaning that it has in modern English. Another early use of the word is from 1240, in a manual titled Carmen de Algorismo composed by Alexandre de Villedieu. It begins with: which translates to: The poem is a few hundred lines long and summarizes the art of calculating with the new styled Indian dice (Tali Indorum), or Hindu numerals. A partial formalization of the modern concept of algorithm began with attempts to solve the Entscheidungsproblem (decision problem) posed by David Hilbert in 1928. Later formalizations were framed as attempts to define "effective calculability" or "effective method". Those formalizations included the Gödel–Herbrand–Kleene recursive functions of 1930, 1934 and 1935, Alonzo Church's lambda calculus of 1936, Emil Post's Formulation 1 of 1936, and Alan Turing's Turing machines of 1936–37 and 1939.

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https://en.wikipedia.org/wiki/Algorithm

Algorithm

Design

In mathematics and computer science, an algorithm () is a finite sequence of rigorous instructions, typically used to solve a class of specific problems or to perform a computation. Algorithms are used as specifications for performing calculations and data processing. More advanced algorithms can perform automated deductions (referred to as automated reasoning) and use mathematical and logical tests to divert the code execution through various routes (referred to as automated decision-making). Using human characteristics as descriptors of machines in metaphorical ways was already practiced by Alan Turing with terms such as "memory", "search" and "stimulus". In contrast, a heuristic is an approach to problem solving that may not be fully specified or may not guarantee correct or optimal results, especially in problem domains where there is no well-defined correct or optimal result. As an effective method, an algorithm can be expressed within a finite amount of space and time, and in a well-defined formal language for calculating a function. Starting from an initial state and initial input (perhaps empty), the instructions describe a computation that, when executed, proceeds through a finite number of well-defined successive states, eventually producing "output" and terminating at a final ending state. The transition from one state to the next is not necessarily deterministic; some algorithms, known as randomized algorithms, incorporate random input.

Algorithm design refers to a method or a mathematical process for problem-solving and engineering algorithms. The design of algorithms is part of many solution theories, such as divide-and-conquer or dynamic programming within operation research. Techniques for designing and implementing algorithm designs are also called algorithm design patterns, with examples including the template method pattern and the decorator pattern. One of the most important aspects of algorithm design is resource (run-time, memory usage) efficiency; the big O notation is used to describe e.g. an algorithm's run-time growth as the size of its input increases. Typical steps in the development of algorithms: Problem definition Development of a model Specification of the algorithm Designing an algorithm Checking the correctness of the algorithm Analysis of algorithm Implementation of algorithm Program testing Documentation preparation

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https://en.wikipedia.org/wiki/Alexander%20the%20Great

Alexander the Great

Historiography

Alexander III of Macedon (; 20/21 July 356 BC – 10/11 June 323 BC), commonly known as Alexander the Great, was a king of the ancient Greek kingdom of Macedon. He succeeded his father Philip II to the throne in 336 BC at the age of 20, and spent most of his ruling years conducting a lengthy military campaign throughout Western Asia and Egypt. By the age of thirty, he had created one of the largest empires in history, stretching from Greece to northwestern India. He was undefeated in battle and is widely considered to be one of history's greatest and most successful military commanders. Until the age of 16, Alexander was tutored by Aristotle. In 335 BC, shortly after his assumption of kingship over Macedon, he campaigned in the Balkans and reasserted control over Thrace and Illyria before marching on the city of Thebes, which was subsequently destroyed in battle. Alexander then led the League of Corinth, and used his authority to launch the pan-Hellenic project envisaged by his father, assuming leadership over all Greeks in their conquest of Persia. In 334 BC, he invaded the Achaemenid Persian Empire and began a series of campaigns that lasted for 10 years. Following his conquest of Asia Minor, Alexander broke the power of Achaemenid Persia in a series of decisive battles, including those at Issus and Gaugamela; he subsequently overthrew Darius III and conquered the Achaemenid Empire in its entirety. After the fall of Persia, the Macedonian Empire held a vast swath of territory between the Adriatic Sea and the Indus River. Alexander endeavored to reach the "ends of the world and the Great Outer Sea" and invaded India in 326 BC, achieving an important victory over Porus, an ancient Indian king of present-day Punjab, at the Battle of the Hydaspes. Due to the demand of his homesick troops, he eventually turned back at the Beas River and later died in 323 BC in Babylon, the city of Mesopotamia that he had planned to establish as his empire's capital. Alexander's death left unexecuted an additional series of planned military and mercantile campaigns that would have begun with a Greek invasion of Arabia. In the years following his death, a series of civil wars broke out across the Macedonian Empire, eventually leading to its disintegration at the hands of the Diadochi. With his death marking the start of the Hellenistic period, Alexander's legacy includes the cultural diffusion and syncretism that his conquests engendered, such as Greco-Buddhism and Hellenistic Judaism. He founded more than twenty cities that bore his name, with the most prominent being the city of Alexandria in Egypt. Alexander's settlement of Greek colonists and the resulting spread of Greek culture led to the overwhelming dominance of Hellenistic civilization and influence as far east as the Indian subcontinent. The Hellenistic period developed through the Roman Empire into modern Western culture; the Greek language became the lingua franca of the region and was the predominant language of the Byzantine Empire up until its collapse in the mid-15th century AD. Greek-speaking communities in central Anatolia and in far-eastern Anatolia survived until the Greek genocide of the 1910s and early 1920s as well as the Greek–Turkish population exchange of the mid-1920s. Alexander became legendary as a classical hero in the mould of Achilles, featuring prominently in the historical and mythical traditions of both Greek and non-Greek cultures. His military achievements and unprecedented enduring successes in battle made him the measure against which many later military leaders would compare themselves, and his tactics remain a significant subject of study in military academies worldwide.

Apart from a few inscriptions and fragments, texts written by people who actually knew Alexander or who gathered information from men who served with Alexander were all lost. Contemporaries who wrote accounts of his life included Alexander's campaign historian Callisthenes; Alexander's generals Ptolemy and Nearchus; Aristobulus, a junior officer on the campaigns; and Onesicritus, Alexander's chief helmsman. Their works are lost, but later works based on these original sources have survived. The earliest of these is Diodorus Siculus (1st century BC), followed by Quintus Curtius Rufus (mid-to-late 1st century AD), Arrian (1st to 2nd century AD), the biographer Plutarch (1st to 2nd century AD), and finally Justin, whose work dated as late as the 4th century. Of these, Arrian is generally considered the most reliable, given that he used Ptolemy and Aristobulus as his sources, closely followed by Diodorus.

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https://en.wikipedia.org/wiki/English%20language

English language

Vocabulary

English is a West Germanic language of the Indo-European language family, with its earliest forms spoken by the inhabitants of early medieval England. It is named after the Angles, one of the ancient Germanic peoples that migrated to the island of Great Britain. English is genealogically West Germanic, closest related to the Low Saxon and Frisian languages; however, its vocabulary is also distinctively influenced by dialects of French (about 29% of modern English words) and Latin (also about 29%), plus some grammar and a small amount of core vocabulary influenced by Old Norse (a North Germanic language). Speakers of English are called Anglophones. The earliest forms of English, collectively known as Old English, evolved from a group of West Germanic (Ingvaeonic) dialects brought to Great Britain by Anglo-Saxon settlers in the 5th century and further mutated by Norse-speaking Viking settlers starting in the 8th and 9th centuries. Middle English began in the late 11th century after the Norman conquest of England, when considerable French (especially Old Norman) and Latin-derived vocabulary was incorporated into English over some three hundred years. Early Modern English began in the late 15th century with the start of the Great Vowel Shift and the Renaissance trend of borrowing further Latin and Greek words and roots into English, concurrent with the introduction of the printing press to London. This era notably culminated in the King James Bible and plays of William Shakespeare. Modern English grammar is the result of a gradual change from a typical Indo-European dependent-marking pattern, with a rich inflectional morphology and relatively free word order, to a mostly analytic pattern with little inflection, and a fairly fixed subject–verb–object word order. Modern English relies more on auxiliary verbs and word order for the expression of complex tenses, aspect and mood, as well as passive constructions, interrogatives and some negation. Modern English has spread around the world since the 17th century as a consequence of the worldwide influence of the British Empire and the United States of America. Through all types of printed and electronic media of these countries, English has become the leading language of international discourse and the lingua franca in many regions and professional contexts such as science, navigation and law. English is the most spoken language in the world and the third-most spoken native language in the world, after Standard Chinese and Spanish. It is the most widely learned second language and is either the official language or one of the official languages in 59 sovereign states. There are more people who have learned English as a second language than there are native speakers. , it was estimated that there were over 2 billion speakers of English. English is the majority native language in the United Kingdom, the United States, Canada, Australia, New Zealand and the Republic of Ireland (see Anglosphere), and is widely spoken in some areas of the Caribbean, Africa, South Asia, Southeast Asia, and Oceania. It is a co-official language of the United Nations, the European Union and many other world and regional international organisations. It is the most widely spoken Germanic language, accounting for at least 70% of speakers of this Indo-European branch.

It is generally stated that English has around 170,000 words, or 220,000 if obsolete words are counted; this estimate is based on the last full edition of the Oxford English Dictionary from 1989. Over half of these words are nouns, a quarter adjectives, and a seventh verbs. There is one count that puts the English vocabulary at about 1 million words—but that count presumably includes words such as Latin species names, scientific terminology, botanical terms, prefixed and suffixed words, jargon, foreign words of extremely limited English use, and technical acronyms. Due to its status as an international language, English adopts foreign words quickly, and borrows vocabulary from many other sources. Early studies of English vocabulary by lexicographers, the scholars who formally study vocabulary, compile dictionaries, or both, were impeded by a lack of comprehensive data on actual vocabulary in use from good-quality linguistic corpora, collections of actual written texts and spoken passages. Many statements published before the end of the 20th century about the growth of English vocabulary over time, the dates of first use of various words in English, and the sources of English vocabulary will have to be corrected as new computerised analysis of linguistic corpus data becomes available.

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https://en.wikipedia.org/wiki/Aircraft

Aircraft

History

An aircraft is a vehicle that is able to fly by gaining support from the air. It counters the force of gravity by using either static lift or by using the dynamic lift of an airfoil, or in a few cases the downward thrust from jet engines. Common examples of aircraft include airplanes, helicopters, airships (including blimps), gliders, paramotors, and hot air balloons. The human activity that surrounds aircraft is called aviation. The science of aviation, including designing and building aircraft, is called aeronautics. Crewed aircraft are flown by an onboard pilot, but unmanned aerial vehicles may be remotely controlled or self-controlled by onboard computers. Aircraft may be classified by different criteria, such as lift type, aircraft propulsion, usage and others.

The Evolution of Modern Aircraft (NASA) Virtual Museum Smithsonian Air and Space Museum - online collection with a particular focus on history of aircraft and spacecraft Amazing Early Flying Machines slideshow by Life magazine

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https://en.wikipedia.org/wiki/Ancient%20Egypt

Ancient Egypt

Population

Ancient Egypt was a civilization in ancient Northeast Africa, situated in the Egyptian Nile Valley in Egypt. Ancient Egyptian civilization followed prehistoric Egypt and coalesced around 3100BC (according to conventional Egyptian chronology) with the political unification of Upper and Lower Egypt under Menes (often identified with Narmer). The history of ancient Egypt occurred as a series of stable kingdoms, separated by periods of relative instability known as Intermediate Periods: the Old Kingdom of the Early Bronze Age, the Middle Kingdom of the Middle Bronze Age and the New Kingdom of the Late Bronze Age. Egypt reached the pinnacle of its power in the New Kingdom, ruling much of Nubia and a sizable portion of the Near East, after which it entered a period of slow decline. During the course of its history Egypt was invaded or conquered by a number of foreign powers, including the Hyksos, the Libyans, the Nubians, the Assyrians, the Achaemenid Persians, and the Macedonians under the command of Alexander the Great. The Greek Ptolemaic Kingdom, formed in the aftermath of Alexander's death, ruled Egypt until 30BC, when, under Cleopatra, it fell to the Roman Empire and became a Roman province. The success of ancient Egyptian civilization came partly from its ability to adapt to the conditions of the Nile River valley for agriculture. The predictable flooding and controlled irrigation of the fertile valley produced surplus crops, which supported a more dense population, and social development and culture. With resources to spare, the administration sponsored mineral exploitation of the valley and surrounding desert regions, the early development of an independent writing system, the organization of collective construction and agricultural projects, trade with surrounding regions, and a military intended to assert Egyptian dominance. Motivating and organizing these activities was a bureaucracy of elite scribes, religious leaders, and administrators under the control of a pharaoh, who ensured the cooperation and unity of the Egyptian people in the context of an elaborate system of religious beliefs. The many achievements of the ancient Egyptians include the quarrying, surveying, and construction techniques that supported the building of monumental pyramids, temples, and obelisks; a system of mathematics, a practical and effective system of medicine, irrigation systems, and agricultural production techniques, the first known planked boats, Egyptian faience and glass technology, new forms of literature, and the earliest known peace treaty, made with the Hittites. Ancient Egypt has left a lasting legacy. Its art and architecture were widely copied, and its antiquities were carried off to far corners of the world. Its monumental ruins have inspired the imaginations of travelers and writers for millennia. A newfound respect for antiquities and excavations in the early modern period by Europeans and Egyptians led to the scientific investigation of Egyptian civilization and a greater appreciation of its cultural legacy.

Estimates of the size of the population range from 1–1.5 million in the 3rd millennium BC to possibly 2–3 million by the 1st millennium BC, before growing significantly towards the end of that millennium.

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https://en.wikipedia.org/wiki/Literature

Literature

Definitions

Literature is any collection of written work, but it is also used more narrowly for writings specifically considered to be an art form, especially prose fiction, drama, and poetry. In recent centuries, the definition has expanded to include oral literature, much of which has been transcribed. Literature is a method of recording, preserving, and transmitting knowledge and entertainment, and can also have a social, psychological, spiritual, or political role. Literature, as an art form, can also include works in various non-fiction genres, such as biography, diaries, memoir, letters, and the essay. Within its broad definition, literature includes non-fictional books, articles or other printed information on a particular subject. Etymologically, the term derives from Latin literatura/litteratura "learning, a writing, grammar," originally "writing formed with letters," from litera/littera "letter". In spite of this, the term has also been applied to spoken or sung texts. Developments in print technology have allowed an ever-growing distribution and proliferation of written works, which now includes electronic literature. Literature is classified according to whether it is poetry, prose or drama, and such works are often further categorized according to historical period, adherence to certain aesthetic features, or genre.

Definitions of literature have varied over time. In Western Europe, prior to the 18th century, literature denoted all books and writing literature can be seen as returning to older, more inclusive notions, so that cultural studies, for instance, include, in addition to canonical works, popular and minority genres. The word is also used in reference non-written works: to "oral literature" and "the literature of preliterate culture". A value judgment definition of literature considers it as consisting solely of high quality writing that forms part of the belles-lettres ("fine writing") tradition. An example of this in the (1910–11) Encyclopædia Britannica that classified literature as "the best expression of the best thought reduced to writing".

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https://en.wikipedia.org/wiki/Avicenna

Avicenna

List of works

Ibn Sina (; 980 – June 1037 CE), commonly known in the West as Avicenna (), was a Persian polymath who is regarded as one of the most significant physicians, astronomers, philosophers, and writers of the Islamic Golden Age, and the father of early modern medicine. Sajjad H. Rizvi has called Avicenna "arguably the most influential philosopher of the pre-modern era". He was a Muslim Peripatetic philosopher influenced by Greek Aristotelian philosophy. Of the 450 works he is believed to have written, around 240 have survived, including 150 on philosophy and 40 on medicine. His most famous works are The Book of Healing, a philosophical and scientific encyclopedia, and The Canon of Medicine, a medical encyclopedia which became a standard medical text at many medieval universities and remained in use as late as 1650. Besides philosophy and medicine, Avicenna's corpus includes writings on astronomy, alchemy, geography and geology, psychology, Islamic theology, logic, mathematics, physics, and works of poetry.

The treatises of Avicenna influenced later Muslim thinkers in many areas including theology, philology, mathematics, astronomy, physics and music. His works numbered almost 450 volumes on a wide range of subjects, of which around 240 have survived. In particular, 150 volumes of his surviving works concentrate on philosophy and 40 of them concentrate on medicine. His most famous works are The Book of Healing, and The Canon of Medicine. Avicenna wrote at least one treatise on alchemy, but several others have been falsely attributed to him. His Logic, Metaphysics, Physics, and De Caelo, are treatises giving a synoptic view of Aristotelian doctrine, though Metaphysics demonstrates a significant departure from the brand of Neoplatonism known as Aristotelianism in Avicenna's world; Arabic philosophers have hinted at the idea that Avicenna was attempting to "re-Aristotelianise" Muslim philosophy in its entirety, unlike his predecessors, who accepted the conflation of Platonic, Aristotelian, Neo- and Middle-Platonic works transmitted into the Muslim world. The Logic and Metaphysics have been extensively reprinted, the latter, e.g., at Venice in 1493, 1495 and 1546. Some of his shorter essays on medicine, logic, etc., take a poetical form (the poem on logic was published by Schmoelders in 1836). Two encyclopedic treatises, dealing with philosophy, are often mentioned. The larger, Al-Shifa' (Sanatio), exists nearly complete in manuscript in the Bodleian Library and elsewhere; part of it on the De Anima appeared at Pavia (1490) as the Liber Sextus Naturalium, and the long account of Avicenna's philosophy given by Muhammad al-Shahrastani seems to be mainly an analysis, and in many places a reproduction, of the Al-Shifa'. A shorter form of the work is known as the An-najat (Liberatio). The Latin editions of part of these works have been modified by the corrections which the monastic editors confess that they applied. There is also a (hikmat-al-mashriqqiyya, in Latin Philosophia Orientalis), mentioned by Roger Bacon, the majority of which is lost in antiquity, which according to Averroes was pantheistic in tone. Avicenna's works further include: Sirat al-shaykh al-ra'is (The Life of Avicenna), ed. and trans. WE. Gohlman, Albany, NY: State University of New York Press, 1974. (The only critical edition of Avicenna's autobiography, supplemented with material from a biography by his student Abu 'Ubayd al-Juzjani. A more recent translation of the Autobiography appears in D. Gutas, Avicenna and the Aristotelian Tradition: Introduction to Reading Avicenna's Philosophical Works, Leiden: Brill, 1988; second edition 2014.) Al-isharat wa al-tanbihat (Remarks and Admonitions), ed. S. Dunya, Cairo, 1960; parts translated by S.C. Inati, Remarks and Admonitions, Part One: Logic, Toronto, Ont.: Pontifical Institute for Mediaeval Studies, 1984, and Ibn Sina and Mysticism, Remarks and Admonitions: Part 4, London: Kegan Paul International, 1996. Al-Qanun fi'l-tibb (The Canon of Medicine), ed. I. a-Qashsh, Cairo, 1987. (Encyclopedia of medicine.) manuscript, Latin translation, Flores Avicenne, Michael de Capella, 1508, Modern text. Ahmed Shawkat Al-Shatti, Jibran Jabbur. Risalah fi sirr al-qadar (Essay on the Secret of Destiny), trans. G. Hourani in Reason and Tradition in Islamic Ethics, Cambridge: Cambridge University Press, 1985. Danishnama-i 'ala'i (The Book of Scientific Knowledge), ed. and trans. P. Morewedge, The Metaphysics of Avicenna, London: Routledge and Kegan Paul, 1973. Kitab al-Shifa''' (The Book of Healing). (Avicenna's major work on philosophy. He probably began to compose al-Shifa' in 1014, and completed it in 1020.) Critical editions of the Arabic text have been published in Cairo, 1952–83, originally under the supervision of I. Madkour. Kitab al-Najat (The Book of Salvation), trans. F. Rahman, Avicenna's Psychology: An English Translation of Kitab al-Najat, Book II, Chapter VI with Historical-philosophical Notes and Textual Improvements on the Cairo Edition, Oxford: Oxford University Press, 1952. (The psychology of al-Shifa'.) (Digital version of the Arabic text) Risala fi'l-Ishq (A Treatise on Love). Translated by Emil L. Fackenheim. Persian works Avicenna's most important Persian work is the Danishnama-i 'Alai (, "the Book of Knowledge for [Prince] 'Ala ad-Daulah"). Avicenna created new scientific vocabulary that had not previously existed in Persian. The Danishnama covers such topics as logic, metaphysics, music theory and other sciences of his time. It has been translated into English by Parwiz Morewedge in 1977. The book is also important in respect to Persian scientific works.Andar Danesh-e Rag (, "On the Science of the Pulse") contains nine chapters on the science of the pulse and is a condensed synopsis. Persian poetry from Avicenna is recorded in various manuscripts and later anthologies such as Nozhat al-Majales. See also Al-Qumri (possibly Avicenna's teacher) Abdol Hamid Khosro Shahi (Iranian theologian) Mummia (Persian medicine) Eastern philosophy Iranian philosophy Islamic philosophy Contemporary Islamic philosophy Science in the medieval Islamic world List of scientists in medieval Islamic world Sufi philosophy Science and technology in Iran Ancient Iranian medicine List of pre-modern Iranian scientists and scholars Namesakes of Ibn Sina Ibn Sina Academy of Medieval Medicine and Sciences in Aligarh Avicenna Bay in Antarctica Avicenna (crater) on the far side of the Moon Avicenna Cultural and Scientific Foundation Avicenne Hospital in Paris, France Avicenna International College in Budapest, Hungary Avicenna Mausoleum (complex dedicated to Avicenna) in Hamadan, Iran Avicenna Research Institute in Tehran, Iran Avicenna Tajik State Medical University in Dushanbe, Tajikistan Bu-Ali Sina University in Hamedan, Iran Ibn Sina Peak – named after the Scientist, on the Kyrgyzstan–Tajikistan border Ibn Sina Foundation in Houston, Texas Ibn Sina Hospital, Baghdad, Iraq Ibn Sina Hospital, Istanbul, Turkey Ibn Sina Medical College Hospital, Dhaka, Bangladesh Ibn Sina University Hospital of Rabat-Salé at Mohammed V University in Rabat, Morocco Ibne Sina Hospital, Multan, Punjab, Pakistan International Ibn Sina Clinic, Dushanbe, Tajikistan References Citations Sources Further reading Encyclopedic articles (PDF version) Avicenna entry by Sajjad H. Rizvi in the Internet Encyclopedia of Philosophy Primary literature For an old list of other extant works, C. Brockelmann's Geschichte der arabischen Litteratur (Weimar 1898), vol. i. pp. 452–458. (XV. W.; G. W. T.) For a current list of his works see A. Bertolacci (2006) and D. Gutas (2014) in the section "Philosophy". Avicenne: Réfutation de l'astrologie. Edition et traduction du texte arabe, introduction, notes et lexique par Yahya Michot. Préface d'Elizabeth Teissier (Beirut-Paris: Albouraq, 2006) . William E. Gohlam (ed.), The Life of Ibn Sina. A Critical Edition and Annotated Translation, Albany, State of New York University Press, 1974. For Ibn Sina's life, see Ibn Khallikan's Biographical Dictionary, translated by de Slane (1842); F. Wüstenfeld's Geschichte der arabischen Aerzte und Naturforscher (Göttingen, 1840). Madelung, Wilferd and Toby Mayer (ed. and tr.), Struggling with the Philosopher: A Refutation of Avicenna's Metaphysics. A New Arabic Edition and English Translation of Shahrastani's Kitab al-Musara'a. Secondary literature This is, on the whole, an informed and good account of the life and accomplishments of one of the greatest influences on the development of thought both Eastern and Western. ... It is not as philosophically thorough as the works of D. Saliba, A.M. Goichon, or L. Gardet, but it is probably the best essay in English on this important thinker of the Middle Ages. (Julius R. Weinberg, The Philosophical Review, Vol. 69, No. 2, Apr. 1960, pp. 255–259) This is a distinguished work which stands out from, and above, many of the books and articles which have been written in this century on Avicenna (Ibn Sīnā) (980–1037). It has two main features on which its distinction as a major contribution to Avicennan studies may be said to rest: the first is its clarity and readability; the second is the comparative approach adopted by the author. ... (Ian Richard Netton, Journal of the Royal Asiatic Society, Third Series, Vol. 4, No. 2, July 1994, pp. 263–264) Y.T. Langermann (ed.), Avicenna and his Legacy. A Golden Age of Science and Philosophy, Brepols Publishers, 2010, For a new understanding of his early career, based on a newly discovered text, see also: Michot, Yahya, Ibn Sînâ: Lettre au vizir Abû Sa'd. Editio princeps d'après le manuscrit de Bursa, traduction de l'arabe, introduction, notes et lexique (Beirut-Paris: Albouraq, 2000) . This German publication is both one of the most comprehensive general introductions to the life and works of the philosopher and physician Avicenna (Ibn Sīnā, d. 1037) and an extensive and careful survey of his contribution to the history of science. Its author is a renowned expert in Greek and Arabic medicine who has paid considerable attention to Avicenna in his recent studies. ... (Amos Bertolacci, Isis, Vol. 96, No. 4, December 2005, p. 649) Shaikh al Rais Ibn Sina (Special number) 1958–59, Ed. Hakim Syed Zillur Rahman, Tibbia College Magazine, Aligarh Muslim University, Aligarh, India. Medicine Browne, Edward G. Islamic Medicine. Fitzpatrick Lectures Delivered at the Royal College of Physicians in 1919–1920, reprint: New Delhi: Goodword Books, 2001. Pormann, Peter & Savage-Smith, Emilie. Medieval Islamic Medicine, Washington: Georgetown University Press, 2007. Prioreschi, Plinio. Byzantine and Islamic Medicine, A History of Medicine, Vol. 4, Omaha: Horatius Press, 2001. Syed Ziaur Rahman. Pharmacology of Avicennian Cardiac Drugs (Metaanalysis of researches and studies in Avicennian Cardiac Drugs along with English translation of Risalah al Adwiya al Qalbiyah), Ibn Sina Academy of Medieval Medicine and Sciences, Aligarh, India, 2020 Philosophy Amos Bertolacci, The Reception of Aristotle's Metaphysics in Avicenna's Kitab al-Sifa'. A Milestone of Western Metaphysical Thought, Leiden: Brill 2006, (Appendix C contains an Overview of the Main Works by Avicenna on Metaphysics in Chronological Order). Dimitri Gutas, Avicenna and the Aristotelian Tradition: Introduction to Reading Avicenna's Philosophical Works, Leiden, Brill 2014, second revised and expanded edition (first edition: 1988), including an inventory of Avicenna' Authentic Works. Andreas Lammer: The Elements of Avicenna's Physics. Greek Sources and Arabic Innovations. Scientia graeco-arabica 20. Berlin / Boston: Walter de Gruyter, 2018. Jon McGinnis and David C. Reisman (eds.) Interpreting Avicenna: Science and Philosophy in Medieval Islam: Proceedings of the Second Conference of the Avicenna Study Group, Leiden: Brill, 2004. Michot, Jean R., La destinée de l'homme selon Avicenne, Louvain: Aedibus Peeters, 1986, . Nader El-Bizri, The Phenomenological Quest between Avicenna and Heidegger, Binghamton, N.Y.: Global Publications SUNY, 2000 (reprinted by SUNY Press in 2014 with a new Preface). Nader El-Bizri, "Avicenna and Essentialism," Review of Metaphysics, Vol. 54 (June 2001), pp. 753–778. Nader El-Bizri, "Avicenna's De Anima between Aristotle and Husserl," in The Passions of the Soul in the Metamorphosis of Becoming, ed. Anna-Teresa Tymieniecka, Dordrecht: Kluwer, 2003, pp. 67–89. Nader El-Bizri, "Being and Necessity: A Phenomenological Investigation of Avicenna's Metaphysics and Cosmology," in Islamic Philosophy and Occidental Phenomenology on the Perennial Issue of Microcosm and Macrocosm, ed. Anna-Teresa Tymieniecka, Dordrecht: Kluwer, 2006, pp. 243–261. Nader El-Bizri, 'Ibn Sīnā's Ontology and the Question of Being', Ishrāq: Islamic Philosophy Yearbook 2 (2011), 222–237 Nader El-Bizri, 'Philosophising at the Margins of 'Sh'i Studies': Reflections on Ibn Sīnā's Ontology', in The Study of Sh'i Islam. History, Theology and Law, eds. F. Daftary and G. Miskinzoda (London: I.B. Tauris, 2014), pp. 585–597. Reisman, David C. (ed.), Before and After Avicenna: Proceedings of the First Conference of the Avicenna Study Group'', Leiden: Brill, 2003.

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https://en.wikipedia.org/wiki/Afterlife

Afterlife

Different metaphysical models

The afterlife (also referred to as life after death) is a purported existence in which the essential part of an individual's identity or their stream of consciousness continues to live after the death of their physical body. The surviving essential aspect varies between belief systems; it may be some partial element, or the entire soul or spirit of an individual, which carries with it and may confer personal identity or, on the contrary, nirvana. Belief in an afterlife is in contrast to the belief in oblivion after death. In some views, this continued existence takes place in a spiritual realm, while in others, the individual may be reborn into this world and begin the life cycle over again, likely with no memory of what they have done in the past. In this latter view, such rebirths and deaths may take place over and over again continuously until the individual gains entry to a spiritual realm or otherworld. Major views on the afterlife derive from religion, esotericism and metaphysics. Some belief systems, such as those in the Abrahamic tradition, hold that the dead go to a specific place after death, as determined by God, or other divine judgment, based on their actions or beliefs during life. In contrast, in systems of reincarnation, such as those in the Indian religions, the nature of the continued existence is determined directly by the actions of the individual in the ended life.

Theists generally believe some afterlife awaits people when they die. Members of some generally non-theistic religions tend to believe in an afterlife but without reference to a deity. The Sadducees were an ancient Jewish sect that generally believed that there was a God but no existence after death. Many religions, whether they believe in the soul's existence in another world like Christianity, Islam, and many pagan belief systems, or reincarnation like many forms of Hinduism and Buddhism, believe that one's status in the afterlife is a consequence of one's conduct during life.

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https://en.wikipedia.org/wiki/Andes

Andes

Etymology

The Andes, Andes Mountains or Andean Mountains (; ) are the longest continental mountain range in the world, forming a continuous highland along the western edge of South America. The range is long, wide (widest between 18°S – 20°S latitude), and has an average height of about . The Andes extend from north to south through seven South American countries: Venezuela, Colombia, Ecuador, Peru, Bolivia, Chile, and Argentina. Along their length, the Andes are split into several ranges, separated by intermediate depressions. The Andes are the location of several high plateaus—some of which host major cities such as Quito, Bogotá, Cali, Arequipa, Medellín, Bucaramanga, Sucre, Mérida, El Alto and La Paz. The Altiplano plateau is the world's second-highest after the Tibetan plateau. These ranges are in turn grouped into three major divisions based on climate: the Tropical Andes, the Dry Andes, and the Wet Andes. The Andes Mountains are the highest mountain range outside Asia. The highest mountain outside Asia, Argentina's Mount Aconcagua, rises to an elevation of about above sea level. The peak of Chimborazo in the Ecuadorian Andes is farther from the Earth's center than any other location on the Earth's surface, due to the equatorial bulge resulting from the Earth's rotation. The world's highest volcanoes are in the Andes, including Ojos del Salado on the Chile-Argentina border, which rises to . The Andes are also part of the American Cordillera, a chain of mountain ranges (cordillera) that consists of an almost continuous sequence of mountain ranges that form the western "backbone" of North America, Central America, South America and Antarctica.

The etymology of the word Andes has been debated. The majority consensus is that it derives from the Quechua word 'east' as in Antisuyu (Quechua for 'east region'), one of the four regions of the Inca Empire. The term cordillera comes from the Spanish word cordel 'rope' and is used as a descriptive name for several contiguous sections of the Andes, as well as the entire Andean range, and the combined mountain chain along the western part of the North and South American continents.

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https://en.wikipedia.org/wiki/Diabetes

Diabetes

Diagnosis

Diabetes, also known as diabetes mellitus, is a group of metabolic disorders characterized by a high blood sugar level (hyperglycemia) over a prolonged period of time. Symptoms often include frequent urination, increased thirst and increased appetite. If left untreated, diabetes can cause many health complications. Acute complications can include diabetic ketoacidosis, hyperosmolar hyperglycemic state, or death. Serious long-term complications include cardiovascular disease, stroke, chronic kidney disease, foot ulcers, damage to the nerves, damage to the eyes, and cognitive impairment. Diabetes is due to either the pancreas not producing enough insulin, or the cells of the body not responding properly to the insulin produced. Insulin is a hormone which is responsible for helping glucose from food get into cells to be used for energy. There are three main types of diabetes mellitus: Type 1 diabetes results from failure of the pancreas to produce enough insulin due to loss of beta cells. This form was previously referred to as "insulin-dependent diabetes mellitus" or "juvenile diabetes". The loss of beta cells is caused by an autoimmune response. The cause of this autoimmune response is unknown. Although Type 1 diabetes usually appears during childhood or adolescence, it can also develop in adults. Type 2 diabetes begins with insulin resistance, a condition in which cells fail to respond to insulin properly. As the disease progresses, a lack of insulin may also develop. This form was previously referred to as "non insulin-dependent diabetes mellitus" or "adult-onset diabetes". Type 2 diabetes is more common in older adults, but a significant increase in the prevalence of obesity among children has led to more cases of type 2 diabetes in younger people. The most common cause is a combination of excessive body weight and insufficient exercise. Gestational diabetes is the third main form, and occurs when pregnant women without a previous history of diabetes develop high blood sugar levels. In women with gestational diabetes, blood sugar usually returns to normal soon after delivery. However, women who had gestational diabetes during pregnancy have a higher risk of developing type 2 diabetes later in life. Type 1 diabetes must be managed with insulin injections. Prevention and treatment of type 2 diabetes involves maintaining a healthy diet, regular physical exercise, a normal body weight, and avoiding use of tobacco. Type 2 diabetes may be treated with oral antidiabetic medications, with or without insulin. Control of blood pressure and maintaining proper foot and eye care are important for people with the disease. Insulin and some oral medications can cause low blood sugar (hypoglycemia). Weight loss surgery in those with obesity is sometimes an effective measure in those with type 2 diabetes. Gestational diabetes usually resolves after the birth of the baby. , an estimated 463 million people had diabetes worldwide (8.8% of the adult population), with type 2 diabetes making up about 90% of the cases. Rates are similar in women and men. Trends suggest that rates will continue to rise. Diabetes at least doubles a person's risk of early death. In 2019, diabetes resulted in approximately 4.2 million deaths. It is the 7th leading cause of death globally. The global economic cost of diabetes-related health expenditure in 2017 was estimated at billion. In the United States, diabetes cost nearly US$327 billion in 2017. Average medical expenditures among people with diabetes are about 2.3 times higher.

Diabetes mellitus is diagnosed with a test for the glucose content in the blood, and is diagnosed by demonstrating any one of the following: Fasting plasma glucose level ≥ 7.0 mmol/L (126 mg/dL). For this test, blood is taken after a period of fasting, i.e. in the morning before breakfast, after the patient had sufficient time to fast overnight. Plasma glucose ≥ 11.1 mmol/L (200 mg/dL) two hours after a 75 gram oral glucose load as in a glucose tolerance test (OGTT) Symptoms of high blood sugar and plasma glucose ≥ 11.1 mmol/L (200 mg/dL) either while fasting or not fasting Glycated hemoglobin (HbA1C) ≥ 48 mmol/mol (≥ 6.5 DCCT %). A positive result, in the absence of unequivocal high blood sugar, should be confirmed by a repeat of any of the above methods on a different day. It is preferable to measure a fasting glucose level because of the ease of measurement and the considerable time commitment of formal glucose tolerance testing, which takes two hours to complete and offers no prognostic advantage over the fasting test. According to the current definition, two fasting glucose measurements above 7.0 mmol/L (126 mg/dL) is considered diagnostic for diabetes mellitus. Per the WHO, people with fasting glucose levels from 6.1 to 6.9 mmol/L (110 to 125 mg/dL) are considered to have impaired fasting glucose. People with plasma glucose at or above 7.8 mmol/L (140 mg/dL), but not over 11.1 mmol/L (200 mg/dL), two hours after a 75 gram oral glucose load are considered to have impaired glucose tolerance. Of these two prediabetic states, the latter in particular is a major risk factor for progression to full-blown diabetes mellitus, as well as cardiovascular disease. The American Diabetes Association (ADA) since 2003 uses a slightly different range for impaired fasting glucose of 5.6 to 6.9 mmol/L (100 to 125 mg/dL). Glycated hemoglobin is better than fasting glucose for determining risks of cardiovascular disease and death from any cause.

projected-40017873-012

https://en.wikipedia.org/wiki/Diabetes

Diabetes

Management

Diabetes, also known as diabetes mellitus, is a group of metabolic disorders characterized by a high blood sugar level (hyperglycemia) over a prolonged period of time. Symptoms often include frequent urination, increased thirst and increased appetite. If left untreated, diabetes can cause many health complications. Acute complications can include diabetic ketoacidosis, hyperosmolar hyperglycemic state, or death. Serious long-term complications include cardiovascular disease, stroke, chronic kidney disease, foot ulcers, damage to the nerves, damage to the eyes, and cognitive impairment. Diabetes is due to either the pancreas not producing enough insulin, or the cells of the body not responding properly to the insulin produced. Insulin is a hormone which is responsible for helping glucose from food get into cells to be used for energy. There are three main types of diabetes mellitus: Type 1 diabetes results from failure of the pancreas to produce enough insulin due to loss of beta cells. This form was previously referred to as "insulin-dependent diabetes mellitus" or "juvenile diabetes". The loss of beta cells is caused by an autoimmune response. The cause of this autoimmune response is unknown. Although Type 1 diabetes usually appears during childhood or adolescence, it can also develop in adults. Type 2 diabetes begins with insulin resistance, a condition in which cells fail to respond to insulin properly. As the disease progresses, a lack of insulin may also develop. This form was previously referred to as "non insulin-dependent diabetes mellitus" or "adult-onset diabetes". Type 2 diabetes is more common in older adults, but a significant increase in the prevalence of obesity among children has led to more cases of type 2 diabetes in younger people. The most common cause is a combination of excessive body weight and insufficient exercise. Gestational diabetes is the third main form, and occurs when pregnant women without a previous history of diabetes develop high blood sugar levels. In women with gestational diabetes, blood sugar usually returns to normal soon after delivery. However, women who had gestational diabetes during pregnancy have a higher risk of developing type 2 diabetes later in life. Type 1 diabetes must be managed with insulin injections. Prevention and treatment of type 2 diabetes involves maintaining a healthy diet, regular physical exercise, a normal body weight, and avoiding use of tobacco. Type 2 diabetes may be treated with oral antidiabetic medications, with or without insulin. Control of blood pressure and maintaining proper foot and eye care are important for people with the disease. Insulin and some oral medications can cause low blood sugar (hypoglycemia). Weight loss surgery in those with obesity is sometimes an effective measure in those with type 2 diabetes. Gestational diabetes usually resolves after the birth of the baby. , an estimated 463 million people had diabetes worldwide (8.8% of the adult population), with type 2 diabetes making up about 90% of the cases. Rates are similar in women and men. Trends suggest that rates will continue to rise. Diabetes at least doubles a person's risk of early death. In 2019, diabetes resulted in approximately 4.2 million deaths. It is the 7th leading cause of death globally. The global economic cost of diabetes-related health expenditure in 2017 was estimated at billion. In the United States, diabetes cost nearly US$327 billion in 2017. Average medical expenditures among people with diabetes are about 2.3 times higher.

Diabetes management concentrates on keeping blood sugar levels as close to normal, without causing low blood sugar. This can usually be accomplished with dietary changes, exercise, weight loss, and use of appropriate medications (insulin, oral medications). Learning about the disease and actively participating in the treatment is important, since complications are far less common and less severe in people who have well-managed blood sugar levels. Per the American College of Physicians, the goal of treatment is an HbA1C level of 7-8%. Attention is also paid to other health problems that may accelerate the negative effects of diabetes. These include smoking, high blood pressure, metabolic syndrome obesity, and lack of regular exercise. Specialized footwear is widely used to reduce the risk of diabetic foot ulcers by relieving the pressure on the foot. Foot examination for patients living with diabetes should be done annually which includes sensation testing, foot biomechanics, vascular integrity and foot structure. The principles of managing diabetes may be similar across the general population with diabetes, however some considerations may need to be addressed when tailoring intervention, mainly in special populations. Considering those with severe mental illness, the efficacy of type 2 diabetes self-management interventions is still poorly explored, with insufficient scientific evidence to show whether these interventions have similar results to those observed in general population.

projected-40017873-021

https://en.wikipedia.org/wiki/Diabetes

Diabetes

History

Diabetes, also known as diabetes mellitus, is a group of metabolic disorders characterized by a high blood sugar level (hyperglycemia) over a prolonged period of time. Symptoms often include frequent urination, increased thirst and increased appetite. If left untreated, diabetes can cause many health complications. Acute complications can include diabetic ketoacidosis, hyperosmolar hyperglycemic state, or death. Serious long-term complications include cardiovascular disease, stroke, chronic kidney disease, foot ulcers, damage to the nerves, damage to the eyes, and cognitive impairment. Diabetes is due to either the pancreas not producing enough insulin, or the cells of the body not responding properly to the insulin produced. Insulin is a hormone which is responsible for helping glucose from food get into cells to be used for energy. There are three main types of diabetes mellitus: Type 1 diabetes results from failure of the pancreas to produce enough insulin due to loss of beta cells. This form was previously referred to as "insulin-dependent diabetes mellitus" or "juvenile diabetes". The loss of beta cells is caused by an autoimmune response. The cause of this autoimmune response is unknown. Although Type 1 diabetes usually appears during childhood or adolescence, it can also develop in adults. Type 2 diabetes begins with insulin resistance, a condition in which cells fail to respond to insulin properly. As the disease progresses, a lack of insulin may also develop. This form was previously referred to as "non insulin-dependent diabetes mellitus" or "adult-onset diabetes". Type 2 diabetes is more common in older adults, but a significant increase in the prevalence of obesity among children has led to more cases of type 2 diabetes in younger people. The most common cause is a combination of excessive body weight and insufficient exercise. Gestational diabetes is the third main form, and occurs when pregnant women without a previous history of diabetes develop high blood sugar levels. In women with gestational diabetes, blood sugar usually returns to normal soon after delivery. However, women who had gestational diabetes during pregnancy have a higher risk of developing type 2 diabetes later in life. Type 1 diabetes must be managed with insulin injections. Prevention and treatment of type 2 diabetes involves maintaining a healthy diet, regular physical exercise, a normal body weight, and avoiding use of tobacco. Type 2 diabetes may be treated with oral antidiabetic medications, with or without insulin. Control of blood pressure and maintaining proper foot and eye care are important for people with the disease. Insulin and some oral medications can cause low blood sugar (hypoglycemia). Weight loss surgery in those with obesity is sometimes an effective measure in those with type 2 diabetes. Gestational diabetes usually resolves after the birth of the baby. , an estimated 463 million people had diabetes worldwide (8.8% of the adult population), with type 2 diabetes making up about 90% of the cases. Rates are similar in women and men. Trends suggest that rates will continue to rise. Diabetes at least doubles a person's risk of early death. In 2019, diabetes resulted in approximately 4.2 million deaths. It is the 7th leading cause of death globally. The global economic cost of diabetes-related health expenditure in 2017 was estimated at billion. In the United States, diabetes cost nearly US$327 billion in 2017. Average medical expenditures among people with diabetes are about 2.3 times higher.

Diabetes was one of the first diseases described, with an Egyptian manuscript from 1500 BCE mentioning "too great emptying of the urine." The Ebers papyrus includes a recommendation for a drink to take in such cases. The first described cases are believed to have been type 1 diabetes. Indian physicians around the same time identified the disease and classified it as madhumeha or "honey urine", noting the urine would attract ants. The term "diabetes" or "to pass through" was first used in 230 BCE by the Greek Apollonius of Memphis. The disease was considered rare during the time of the Roman empire, with Galen commenting he had only seen two cases during his career. This is possibly due to the diet and lifestyle of the ancients, or because the clinical symptoms were observed during the advanced stage of the disease. Galen named the disease "diarrhea of the urine" (diarrhea urinosa). The earliest surviving work with a detailed reference to diabetes is that of Aretaeus of Cappadocia (2nd or early 3rdcentury CE). He described the symptoms and the course of the disease, which he attributed to the moisture and coldness, reflecting the beliefs of the "Pneumatic School". He hypothesized a correlation between diabetes and other diseases, and he discussed differential diagnosis from the snakebite, which also provokes excessive thirst. His work remained unknown in the West until 1552, when the first Latin edition was published in Venice. Two types of diabetes were identified as separate conditions for the first time by the Indian physicians Sushruta and Charaka in 400–500 CE with one type being associated with youth and another type with being overweight. Effective treatment was not developed until the early part of the 20th century when Canadians Frederick Banting and Charles Herbert Best isolated and purified insulin in 1921 and 1922. This was followed by the development of the long-acting insulin NPH in the 1940s.

projected-00001805-006

https://en.wikipedia.org/wiki/Antibiotic

Antibiotic

Side effects

An antibiotic is a type of antimicrobial substance active against bacteria. It is the most important type of antibacterial agent for fighting bacterial infections, and antibiotic medications are widely used in the treatment and prevention of such infections. They may either kill or inhibit the growth of bacteria. A limited number of antibiotics also possess antiprotozoal activity. Antibiotics are not effective against viruses such as the common cold or influenza; drugs which inhibit viruses are termed antiviral drugs or antivirals rather than antibiotics. Sometimes, the term antibiotic—literally "opposing life", from the Greek roots ἀντι anti, "against" and βίος bios, "life"—is broadly used to refer to any substance used against microbes, but in the usual medical usage, antibiotics (such as penicillin) are those produced naturally (by one microorganism fighting another), whereas non-antibiotic antibacterials (such as sulfonamides and antiseptics) are fully synthetic. However, both classes have the same goal of killing or preventing the growth of microorganisms, and both are included in antimicrobial chemotherapy. "Antibacterials" include antiseptic drugs, antibacterial soaps, and chemical disinfectants, whereas antibiotics are an important class of antibacterials used more specifically in medicine and sometimes in livestock feed. Antibiotics have been used since ancient times. Many civilizations used topical application of moldy bread, with many references to its beneficial effects arising from ancient Egypt, Nubia, China, Serbia, Greece, and Rome. The first person to directly document the use of molds to treat infections was John Parkinson (1567–1650). Antibiotics revolutionized medicine in the 20th century. Alexander Fleming (1881–1955) discovered modern day penicillin in 1928, the widespread use of which proved significantly beneficial during wartime. However, the effectiveness and easy access to antibiotics have also led to their overuse and some bacteria have evolved resistance to them. The World Health Organization has classified antimicrobial resistance as a widespread "serious threat [that] is no longer a prediction for the future, it is happening right now in every region of the world and has the potential to affect anyone, of any age, in any country". Global deaths attributable to antimicrobial resistance numbered 1.27 million in 2019.

Antibiotics are screened for any negative effects before their approval for clinical use, and are usually considered safe and well tolerated. However, some antibiotics have been associated with a wide extent of adverse side effects ranging from mild to very severe depending on the type of antibiotic used, the microbes targeted, and the individual patient. Side effects may reflect the pharmacological or toxicological properties of the antibiotic or may involve hypersensitivity or allergic reactions. Adverse effects range from fever and nausea to major allergic reactions, including photodermatitis and anaphylaxis. Common side effects of oral antibiotics include diarrhea, resulting from disruption of the species composition in the intestinal flora, resulting, for example, in overgrowth of pathogenic bacteria, such as Clostridium difficile. Taking probiotics during the course of antibiotic treatment can help prevent antibiotic-associated diarrhea. Antibacterials can also affect the vaginal flora, and may lead to overgrowth of yeast species of the genus Candida in the vulvo-vaginal area. Additional side effects can result from interaction with other drugs, such as the possibility of tendon damage from the administration of a quinolone antibiotic with a systemic corticosteroid. Some antibiotics may also damage the mitochondrion, a bacteria-derived organelle found in eukaryotic, including human, cells. Mitochondrial damage cause oxidative stress in cells and has been suggested as a mechanism for side effects from fluoroquinolones. They are also known to affect chloroplasts.

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https://en.wikipedia.org/wiki/Popular%20culture

Popular culture

History

Popular culture (also called mass culture or pop culture) is generally recognized by members of a society as a set of practices, beliefs, and objects that are dominant or prevalent in a society at a given point in time. Popular culture also encompasses the activities and feelings produced as a result of interaction with these dominant objects. The primary driving force behind popular culture is the mass appeal, and it is produced by what cultural analyst Theodor Adorno refers to as the "culture industry". Heavily influenced in modern times by mass media, this collection of ideas permeates the everyday lives of people in a given society. Therefore, popular culture has a way of influencing an individual's attitudes towards certain topics. However, there are various ways to define pop culture. Because of this, popular culture is something that can be defined in a variety of conflicting ways by different people across different contexts. It is generally viewed in contrast to other forms of culture such as folk cults, working-class culture, or high culture, and also through different academic perspectives such as psychoanalysis, structuralism, postmodernism, and more. The common pop-culture categories are: entertainment (such as film, music, television and video games), sports, news (as in people/places in the news), politics, fashion, technology, and slang.

In the past folk culture functioned analogously to the popular culture of the masses and of the nations. The phrase "popular culture" was coined in the 19th century or earlier. Traditionally, popular culture was associated with poor education and with the lower classes, as opposed to the "official culture" and higher education of the upper classes. With the rise of the Industrial Revolution in the eighteenth and nineteenth centuries, Britain experienced social changes that resulted in increased literacy rates, and with the rise of capitalism and industrialization, people began to spend more money on entertainment, such as (commercialised) pubs and sports. Reading also gained traction. Labelling penny dreadfuls the Victorian equivalent of video games, The Guardian in 2016 described penny fiction as "Britain's first taste of mass-produced popular culture for the young". A growing consumer culture and an increased capacity for travel via the newly invented railway (the first public railway, Stockton and Darlington Railway, opened in north-east England in 1825) created both a market for cheap popular literature, and the ability for its distribution on large scale. The first penny serials were published in the 1830s to meet the growing demand. The stress in the distinction from "official culture" became more pronounced towards the end of the 19th century, a usage that became established by the interbellum period. From the end of World War II, following major cultural and social changes brought by mass media innovations, the meaning of "popular culture" began to overlap with the connotations of "mass culture", "media culture", "image culture", "consumer culture", and "culture for mass consumption". The abbreviated form "pop" for "popular", as in "pop music", dates from the late 1950s. Although the terms "pop" and "popular" are in some cases used interchangeably, and their meaning partially overlap, the term "pop" is narrower. Pop is specific to something containing qualities of mass appeal, while "popular" refers to what has gained popularity, regardless of its style.

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https://en.wikipedia.org/wiki/Prehistory

Prehistory

Timeline

Prehistory, also known as pre-literary history, is the period of human history between the use of the first stone tools by hominins 3.3 million years ago and the beginning of recorded history with the invention of writing systems. The use of symbols, marks, and images appears very early among humans, but the earliest known writing systems appeared 5000 years ago. It took thousands of years for writing systems to be widely adopted, with writing spreading to almost all cultures by the 19th century. The end of prehistory therefore came at very different times in different places, and the term is less often used in discussing societies where prehistory ended relatively recently. In the early Bronze Age, Sumer in Mesopotamia, the Indus valley civilization, and ancient Egypt were the first civilizations to develop their own scripts and to keep historical records, with their neighbors following. Most other civilizations reached the end of prehistory during the following Iron Age. The three-age division of prehistory into Stone Age, Bronze Age, and Iron Age remains in use for much of Eurasia and North Africa, but is not generally used in those parts of the world where the working of hard metals arrived abruptly from contact with Eurasian cultures, such as Oceania, Australasia, much of Sub-Saharan Africa, and parts of the Americas. With some exceptions in pre-Columbian civilizations in the Americas, these areas did not develop complex writing systems before the arrival of Eurasians, so their prehistory reaches into relatively recent periods; for example, 1788 is usually taken as the end of the prehistory of Australia. The period when a culture is written about by others, but has not developed its own writing system is often known as the protohistory of the culture. By definition, there are no written records from human prehistory, which we can only know from material archaeological and anthropological evidence: prehistoric materials and human remains. These were at first understood by the collection of folklore and by analogy with pre-literate societies observed in modern times. The key step to understanding prehistoric evidence is dating, and reliable dating techniques have developed steadily since the nineteenth century. Further evidence has come from the reconstruction of ancient spoken languages. More recent techniques include forensic chemical analysis to reveal the use and provenance of materials, and genetic analysis of bones to determine kinship and physical characteristics of prehistoric peoples.

All dates are approximate and conjectural, obtained through research in the fields of anthropology, archaeology, genetics, geology, or linguistics. They are all subject to revision due to new discoveries or improved calculations. BP stands for "Before Present (1950)." BCE stands for "Before Common Era".

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https://en.wikipedia.org/wiki/Tang%20dynasty

Tang dynasty

Historiography

The Tang dynasty (, ; ), or Tang Empire, was an imperial dynasty of China that ruled from 618 to 907 AD, with an interregnum between 690 and 705. It was preceded by the Sui dynasty and followed by the Five Dynasties and Ten Kingdoms period. Historians generally regard the Tang as a high point in Chinese civilization, and a golden age of cosmopolitan culture. Tang territory, acquired through the military campaigns of its early rulers, rivaled that of the Han dynasty. The Lǐ family () founded the dynasty, seizing power during the decline and collapse of the Sui Empire and inaugurating a period of progress and stability in the first half of the dynasty's rule. The dynasty was formally interrupted during 690–705 when Empress Wu Zetian seized the throne, proclaiming the Wu Zhou dynasty and becoming the only legitimate Chinese empress regnant. The devastating An Lushan Rebellion (755–763) shook the nation and led to the decline of central authority in the dynasty's latter half. Like the previous Sui dynasty, the Tang maintained a civil-service system by recruiting scholar-officials through standardized examinations and recommendations to office. The rise of regional military governors known as jiedushi during the 9th century undermined this civil order. The dynasty and central government went into decline by the latter half of the 9th century; agrarian rebellions resulted in mass population loss and displacement, widespread poverty, and further government dysfunction that ultimately ended the dynasty in 907. The Tang capital at Chang'an (present-day Xi'an) was then the world's most populous city. Two censuses of the 7th and 8th centuries estimated the empire's population at about 50 million people, which grew to an estimated 80 million by the dynasty's end. From its numerous subjects, the dynasty raised professional and conscripted armies of hundreds of thousands of troops to contend with nomadic powers for control of Inner Asia and the lucrative trade-routes along the Silk Road. Far-flung kingdoms and states paid tribute to the Tang court, while the Tang also indirectly controlled several regions through a protectorate system. In addition to its political hegemony, the Tang exerted a powerful cultural influence over neighboring East Asian nations such as Japan and Korea. Chinese culture flourished and further matured during the Tang era. It is traditionally considered the greatest age for Chinese poetry. Two of China's most famous poets, Li Bai and Du Fu, belonged to this age, contributing with poets such as Wang Wei to the monumental Three Hundred Tang Poems. Many famous painters such as Han Gan, Zhang Xuan, and Zhou Fang were active, while Chinese court music flourished with instruments such as the popular pipa. Tang scholars compiled a rich variety of historical literature, as well as encyclopedias and geographical works. Notable innovations included the development of woodblock printing. Buddhism became a major influence in Chinese culture, with native Chinese sects gaining prominence. However, in the 840s, Emperor Wuzong enacted policies to suppress Buddhism, which subsequently declined in influence.

The first classic work about the Tang is the Old Book of Tang by Liu Xu (887–946) et al. of the Later Jin, who redacted it during the last years of his life. This was edited into another history (labeled the New Book of Tang) in order to distinguish it, which was a work by the Song historians Ouyang Xiu (1007–1072), Song Qi (998–1061), et al. of the Song dynasty (between the years 1044 and 1060). Both of them were based upon earlier annals, yet those are now lost. Both of them also rank among the Twenty-Four Histories of China. One of the surviving sources of the Old Book of Tang, primarily covering up to 756, is the Tongdian, which Du You presented to the emperor in 801. The Tang period was again placed into the enormous universal history text of the Zizhi Tongjian, edited, compiled, and completed in 1084 by a team of scholars under the Song dynasty Chancellor Sima Guang (1019–1086). This historical text, written with three million Chinese characters in 294 volumes, covered the history of China from the beginning of the Warring States (403 BC) until the beginning of the Song dynasty (960).

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https://en.wikipedia.org/wiki/Fairy%20tale

Fairy tale

Interpretations

A fairy tale, fairytale, wonder tale, magic tale, fairy story or Märchen is an instance of folklore genre that takes the form of a short story. Such stories typically feature mythical entities such as dwarfs, dragons, elves, fairies and Peris, giants, Divs, gnomes, goblins, griffins, mermaids, talking animals, trolls, unicorns, or witches, and usually magic or enchantments. In most cultures, there is no clear line separating myth from folk or fairy tale; all these together form the literature of preliterate societies. Fairy tales may be distinguished from other folk narratives such as legends (which generally involve belief in the veracity of the events described) and explicit moral tales, including beast fables. In less technical contexts, the term is also used to describe something blessed with unusual happiness, as in "fairy-tale ending" (a happy ending) or "fairy-tale romance". Colloquially, the term "fairy tale" or "fairy story" can also mean any far-fetched story or tall tale; it is used especially of any story that not only is not true, but could not possibly be true. Legends are perceived as real within their culture; fairy tales may merge into legends, where the narrative is perceived both by teller and hearers as being grounded in historical truth. However, unlike legends and epics, fairy tales usually do not contain more than superficial references to religion and to actual places, people, and events; they take place "once upon a time" rather than in actual times. Fairy tales occur both in oral and in literary form; the name "fairy tale" ("conte de fées" in French) was first ascribed to them by Madame d'Aulnoy in the late 17th century. Many of today's fairy tales have evolved from centuries-old stories that have appeared, with variations, in multiple cultures around the world. The history of the fairy tale is particularly difficult to trace because only the literary forms can survive. Still, according to researchers at universities in Durham and Lisbon, such stories may date back thousands of years, some to the Bronze Age. Fairy tales, and works derived from fairy tales, are still written today. The Jatakas are probably the oldest collection of such tales in literature, and the greater part of the rest are demonstrably more than a thousand years old. It is certain that much (perhaps one~fifth) of the popular literature of modern Europe is derived from those portions of this large bulk which came west with the Crusades through the medium of Arabs and Jews. Folklorists have classified fairy tales in various ways. The Aarne-Thompson classification system and the morphological analysis of Vladimir Propp are among the most notable. Other folklorists have interpreted the tales' significance, but no school has been definitively established for the meaning of the tales.

Many fairy tales have been interpreted for their (purported) significance. One mythological interpretation saw many fairy tales, including Hansel and Gretel, Sleeping Beauty, and The Frog King, as solar myths; this mode of interpretation subsequently became rather less popular. Freudian, Jungian, and other psychological analyses have also explicated many tales, but no mode of interpretation has established itself definitively. Specific analyses have often been criticized for lending great importance to motifs that are not, in fact, integral to the tale; this has often stemmed from treating one instance of a fairy tale as the definitive text, where the tale has been told and retold in many variations. In variants of Bluebeard, the wife's curiosity is betrayed by a blood-stained key, by an egg's breaking, or by the singing of a rose she wore, without affecting the tale, but interpretations of specific variants have claimed that the precise object is integral to the tale. Other folklorists have interpreted tales as historical documents. Many German folklorists, believing the tales to have preserved details from ancient times, have used the Grimms' tales to explain ancient customs. One approach sees the topography of European Märchen as echoing the period immediately following the last Ice Age. Other folklorists have explained the figure of the wicked stepmother in a historical/sociological context: many women did die in childbirth, their husbands remarried, and the new stepmothers competed with the children of the first marriage for resources. In a 2012 lecture, Jack Zipes reads fairy tales as examples of what he calls "childism". He suggests that there are terrible aspects to the tales, which (among other things) have conditioned children to accept mistreatment and even abuse.

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https://en.wikipedia.org/wiki/Asthma

Asthma

Causes

Asthma is a long-term inflammatory disease of the airways of the lungs. It is characterized by variable and recurring symptoms, reversible airflow obstruction, and easily triggered bronchospasms. Symptoms include episodes of wheezing, coughing, chest tightness, and shortness of breath. These may occur a few times a day or a few times per week. Depending on the person, asthma symptoms may become worse at night or with exercise. Asthma is thought to be caused by a combination of genetic and environmental factors. Environmental factors include exposure to air pollution and allergens. Other potential triggers include medications such as aspirin and beta blockers. Diagnosis is usually based on the pattern of symptoms, response to therapy over time, and spirometry lung function testing. Asthma is classified according to the frequency of symptoms, forced expiratory volume in one second (FEV1), and peak expiratory flow rate. It may also be classified as atopic or non-atopic, where atopy refers to a predisposition toward developing a type 1 hypersensitivity reaction. There is no known cure for asthma, but can be controlled. Symptoms can be prevented by avoiding triggers, such as allergens and respiratory irritants, and suppressed with the use of inhaled corticosteroids. Long-acting beta agonists (LABA) or antileukotriene agents may be used in addition to inhaled corticosteroids if asthma symptoms remain uncontrolled. Treatment of rapidly worsening symptoms is usually with an inhaled short-acting beta-2 agonist such as salbutamol and corticosteroids taken by mouth. In very severe cases, intravenous corticosteroids, magnesium sulfate, and hospitalization may be required. In 2019 asthma affected approximately 262 million people and caused approximately 461,000 deaths. Most of the deaths occurred in the developing world. Asthma often begins in childhood, and the rates have increased significantly since the 1960s. Asthma was recognized as early as Ancient Egypt. The word "asthma" is from the Greek , âsthma, which means "panting".

Asthma is caused by a combination of complex and incompletely understood environmental and genetic interactions. These influence both its severity and its responsiveness to treatment. It is believed that the recent increased rates of asthma are due to changing epigenetics (heritable factors other than those related to the DNA sequence) and a changing living environment. Asthma that starts before the age of 12 years old is more likely due to genetic influence, while onset after age 12 is more likely due to environmental influence.

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https://en.wikipedia.org/wiki/Alcoholism

Alcoholism

Society and culture

Alcoholism is, broadly, any drinking of alcohol that results in significant mental or physical health problems. Because there is disagreement on the definition of the word alcoholism, it is not a recognized diagnostic entity. Predominant diagnostic classifications are alcohol use disorder (DSM-5) or alcohol dependence (ICD-11); these are defined in their respective sources. Excessive alcohol use can damage all organ systems, but it particularly affects the brain, heart, liver, pancreas and immune system. Alcoholism can result in mental illness, delirium tremens, Wernicke–Korsakoff syndrome, irregular heartbeat, an impaired immune response, liver cirrhosis and increased cancer risk. Drinking during pregnancy can result in fetal alcohol spectrum disorders. Women are generally more sensitive than men to the harmful effects of alcohol, primarily due to their smaller body weight, lower capacity to metabolize alcohol, and higher proportion of body fat. In a small number of individuals, prolonged, severe alcohol misuse ultimately leads to cognitive impairment and frank dementia. Environment and genetics are two factors in the risk of development of alcoholism, with about half the risk attributed to each. Stress and associated disorders, including anxiety, are key factors in the development of alcoholism as alcohol consumption can temporarily reduce dysphoria. Someone with a parent or sibling with an alcohol use disorder is three to four times more likely to develop an alcohol use disorder themselves, but only a minority of them do. Environmental factors include social, cultural and behavioral influences. High stress levels and anxiety, as well as alcohol's inexpensive cost and easy accessibility, increase the risk. People may continue to drink partly to prevent or improve symptoms of withdrawal. After a person stops drinking alcohol, they may experience a low level of withdrawal lasting for months. Medically, alcoholism is considered both a physical and mental illness. Questionnaires are usually used to detect possible alcoholism. Further information is then collected to confirm the diagnosis. Prevention of alcoholism may be attempted by reducing the experience of stress and anxiety in individuals. It can be attempted by regulating and limiting the sale of alcohol (particularly to minors), taxing alcohol to increase its cost, and providing education and treatment. Treatment of alcoholism may take several forms. Due to medical problems that can occur during withdrawal, alcohol cessation should be controlled carefully. One common method involves the use of benzodiazepine medications, such as diazepam. These can be taken while admitted to a health care institution or individually. The medications acamprosate, disulfiram or naltrexone may also be used to help prevent further drinking. Mental illness or other addictions may complicate treatment. Various forms of individual or group therapy or support groups are used to attempt to keep a person from returning to alcoholism. One support group is Alcoholics Anonymous. The World Health Organization has estimated that , there were 380 million people with alcoholism worldwide (5.1% of the population over 15 years of age). in the United States, about 17 million (7%) of adults and 0.7 million (2.8%) of those age 12 to 17 years of age are affected. Alcoholism is most common among males and young adults. Geographically, it is least common in Africa (1.1% of the population) and has the highest rates in Eastern Europe (11%). Alcoholism directly resulted in 139,000 deaths in 2013, up from 112,000 deaths in 1990. A total of 3.3 million deaths (5.9% of all deaths) are believed to be due to alcohol. Alcoholism reduces a person's life expectancy by approximately ten years. Many terms, some slurs and others informal, have been used to refer to people affected by alcoholism; the expressions include tippler, drunkard, dipsomaniac and souse. In 1979, the World Health Organization discouraged the use of alcoholism due to its inexact meaning, preferring alcohol dependence syndrome.

The various health problems associated with long-term alcohol consumption are generally perceived as detrimental to society, for example, money due to lost labor-hours, medical costs due to injuries due to drunkenness and organ damage from long-term use, and secondary treatment costs, such as the costs of rehabilitation facilities and detoxification centers. Alcohol use is a major contributing factor for head injuries, motor vehicle injuries (27%), interpersonal violence (18%), suicides (18%), and epilepsy (13%). Beyond the financial costs that alcohol consumption imposes, there are also significant social costs to both the alcoholic and their family and friends. For instance, alcohol consumption by a pregnant woman can lead to an incurable and damaging condition known as fetal alcohol syndrome, which often results in cognitive deficits, mental health problems, an inability to live independently and an increased risk of criminal behaviour, all of which can cause emotional stress for parents and caregivers. Estimates of the economic costs of alcohol misuse, collected by the World Health Organization, vary from one to six% of a country's GDP. One Australian estimate pegged alcohol's social costs at 24% of all drug misuse costs; a similar Canadian study concluded alcohol's share was 41%. One study quantified the cost to the UK of all forms of alcohol misuse in 2001 as £18.5–20 billion. All economic costs in the United States in 2006 have been estimated at $223.5 billion. The idea of hitting rock bottom refers to an experience of stress that can be attributed to alcohol misuse. There is no single definition for this idea, and people may identify their own lowest points in terms of lost jobs, lost relationships, health problems, legal problems, or other consequences of alcohol misuse. The concept is promoted by 12-step recovery groups and researchers using the transtheoretical model of motivation for behavior change. The first use of this slang phrase in the formal medical literature appeared in a 1965 review in the British Medical Journal, which said that some men refused treatment until they "hit rock bottom", but that treatment was generally more successful for "the alcohol addict who has friends and family to support him" than for impoverished and homeless addicts. Stereotypes of alcoholics are often found in fiction and popular culture. The "town drunk" is a stock character in Western popular culture. Stereotypes of drunkenness may be based on racism or xenophobia, as in the fictional depiction of the Irish as heavy drinkers. Studies by social psychologists Stivers and Greeley attempt to document the perceived prevalence of high alcohol consumption amongst the Irish in America. Alcohol consumption is relatively similar between many European cultures, the United States, and Australia. In Asian countries that have a high gross domestic product, there is heightened drinking compared to other Asian countries, but it is nowhere near as high as it is in other countries like the United States. It is also inversely seen, with countries that have very low gross domestic product showing high alcohol consumption. In a study done on Korean immigrants in Canada, they reported alcohol was even an integral part of their meal, and is the only time solo drinking should occur. They also believe alcohol is necessary at any social event as it helps conversations start. Peyote, a psychoactive agent, has even shown promise in treating alcoholism. Alcohol had actually replaced peyote as Native Americans' psychoactive agent of choice in rituals when peyote was outlawed.

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https://en.wikipedia.org/wiki/Arithmetic

Arithmetic

Fundamental theorem of arithmetic

Arithmetic () is an elementary part of mathematics that consists of the study of the properties of the traditional operations on numbers—addition, subtraction, multiplication, division, exponentiation, and extraction of roots. In the 19th century, Italian mathematician Giuseppe Peano formalized arithmetic with his Peano axioms, which are highly important to the field of mathematical logic today.

The fundamental theorem of arithmetic states that any integer greater than 1 has a unique prime factorization (a representation of a number as the product of prime factors), excluding the order of the factors. For example, 252 only has one prime factorization: 252 = 2 × 3 × 7 Euclid's Elements first introduced this theorem, and gave a partial proof (which is called Euclid's lemma). The fundamental theorem of arithmetic was first proven by Carl Friedrich Gauss. The fundamental theorem of arithmetic is one of the reasons why 1 is not considered a prime number. Other reasons include the sieve of Eratosthenes, and the definition of a prime number itself (a natural number greater than 1 that cannot be formed by multiplying two smaller natural numbers.).

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https://en.wikipedia.org/wiki/Board%20game

Board game

Categories

Board games are tabletop games that typically use . These pieces are moved or placed on a pre-marked board (playing surface) and often include elements of table, card, role-playing, and miniatures games as well. Many board games feature a competition between two or more players. To show a few examples: in checkers (British English name 'draughts'), a player wins by capturing all opposing pieces, while Eurogames often end with a calculation of final scores. Pandemic is a cooperative game where players all win or lose as a team, and peg solitaire is a puzzle for one person. There are many varieties of board games. Their representation of real-life situations can range from having no inherent theme, such as checkers, to having a specific theme and narrative, such as Cluedo. Rules can range from the very simple, such as in Snakes and Ladders; to deeply complex, as in Advanced Squad Leader. Play components now often include custom figures or shaped counters, and distinctively shaped player pieces commonly known as meeples as well as traditional cards and dice. The time required to learn or master game play varies greatly from game to game, but is not necessarily related to the number or complexity of rules, and games like chess or Go possess relatively simple , but have great strategic depth.

There are a number of ways in which board games can be classified, and considerable overlap may exist, so that a game belong in several categories. H. J. R. Murray's A History of Board Games Other Than Chess (1952) has been called the first attempt to develop a "scheme for the classification of board games". David Parlett's Oxford History of Board Games (1999) defines four primary categories: race games (where the goal is to be the first to move all one's pieces to the final destination), space games (in which the object is to arrange the pieces into some special configuration), chase games (asymmetrical games, where players start the game with different sets of pieces and objectives) and displace games (where the main objective is the capture the opponents' pieces). Parlett's also distinguishes between abstract and thematic games, the latter having a specific theme or frame narrative (ex. regular chess versus, for example, Star Wars-themed chess). The following is a list of some of the most common game categories: Abstract strategy games – e.g. Chess, Checkers, Go, Reversi, tafl games, or modern games such as Abalone, Dameo, Stratego, Hive, or GIPF Alignment games – e.g. Renju, Gomoku, Connect6, Nine men's morris, or Tic-tac-toe Auction games – e.g. Hoity Toity, Power Grid Chess variants – traditional variants e.g. shogi, xiangqi, or janggi; modern variants e.g. Chess960, Grand Chess, Hexagonal chess, or Alice Chess Configuration games – e.g. Lines of Action, Hexade, or Entropy Connection games – e.g. TwixT, Hex, or Havannah Cooperative games – e.g. Max the Cat, Caves and Claws, or Pandemic Count and capture games – e.g. mancala games Cross and circle games – e.g. Yut, Ludo, or Aggravation Deduction games – e.g. Mastermind or Black Box Dexterity games – e.g. Tumblin' Dice or Pitch Car Economic simulation games – e.g. The Business Game, Monopoly, The Game of Life, Power Grid, or Food Chain Magnate Educational games – e.g. Arthur Saves the Planet, Cleopatra and the Society of Architects, or Shakespeare: The Bard Game Elimination games – e.g. draughts, Alquerque, Fanorona, Yoté, or Surakarta Family games – e.g. Roll Through the Ages, Birds on a Wire, or For Sale Fantasy games – e.g. Shadows Over Camelot German-style board games or Eurogames – e.g. Catan, Carcassonne, Decatur • The Game, Carson City, or Puerto Rico Guessing games – e.g. Pictionary or Battleship Hidden-movement games – e.g. Clue or Escape from the Aliens in Outer Space Hidden-role games – e.g. Mafia or The Resistance Historical simulation games – e.g. Through the Ages or Railways of the World Horror games – e.g. Arkham Horror Large multiplayer games – e.g. Take It Easy or Swat (2010) Learning/communication non-competitive games – e.g. The Ungame (1972) Mancala games – e.g. Wari, Oware, or The Glass Bead Game Multiplayer games – e.g. Risk, Monopoly, or Four-player chess Musical games – e.g. Spontuneous Negotiation games – e.g. Diplomacy Paper-and-pencil games – e.g. Tic-tac-toe or Dots and Boxes Physical skill games – e.g. Camp Granada Position games (no captures; win by leaving the opponent unable to move) – e.g. Kōnane, mū tōrere, or the L game Race games – e.g. Pachisi, backgammon, Snakes and Ladders, Hyena chase, or Worm Up Role-playing games – e.g. Dungeons & Dragons Roll-and-move games – e.g. Monopoly or Life Running-fight games – e.g. Bul Share-buying games (games in which players buy stakes in each other's positions) – typically longer economic-management games, e.g. Acquire or Panamax Single-player puzzle games – e.g. peg solitaire or Sudoku Spiritual development games (games with no winners or losers) – e.g. Transformation Game or Psyche's Key Stacking games – e.g. Lasca or DVONN Storytelling games – e.g. Dixit or Tales of the Arabian Nights Territory games – e.g. Go or Reversi Tile-based games – e.g. Carcassonne, Scrabble, Tigris and Euphrates, or Evo Train games – e.g. Ticket to Ride, Steam, or 18xx Trivia games – e.g. Trivial Pursuit Two-player-only themed games – e.g. En Garde or Dos de Mayo Unequal forces (or "hunt") games – e.g. Fox and Geese or Tablut Wargames – ranging from Risk, Diplomacy, or Axis & Allies, to Attack! or Conquest of the Empire Word games – e.g. Scrabble, Boggle, Anagrams, or What's My Word? (2010)

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https://en.wikipedia.org/wiki/Biotechnology

Biotechnology

Definition

Biotechnology is the integration of natural sciences and engineering sciences in order to achieve the application of organisms, cells, parts there of and molecular analogues for products and services. The term biotechnology was first used by Károly Ereky in 1919, meaning the production of products from raw materials with the aid of living organisms.

The concept of biotechnology encompasses a wide range of procedures for modifying living organisms according to human purposes, going back to domestication of animals, cultivation of the plants, and "improvements" to these through breeding programs that employ artificial selection and hybridization. Modern usage also includes genetic engineering as well as cell and tissue culture technologies. The American Chemical Society defines biotechnology as the application of biological organisms, systems, or processes by various industries to learning about the science of life and the improvement of the value of materials and organisms such as pharmaceuticals, crops, and livestock. As per the European Federation of Biotechnology, biotechnology is the integration of natural science and organisms, cells, parts thereof, and molecular analogues for products and services. Biotechnology is based on the basic biological sciences (e.g., molecular biology, biochemistry, cell biology, embryology, genetics, microbiology) and conversely provides methods to support and perform basic research in biology. Biotechnology is the research and development in the laboratory using bioinformatics for exploration, extraction, exploitation, and production from any living organisms and any source of biomass by means of biochemical engineering where high value-added products could be planned (reproduced by biosynthesis, for example), forecasted, formulated, developed, manufactured, and marketed for the purpose of sustainable operations (for the return from bottomless initial investment on R & D) and gaining durable patents rights (for exclusives rights for sales, and prior to this to receive national and international approval from the results on animal experiment and human experiment, especially on the pharmaceutical branch of biotechnology to prevent any undetected side-effects or safety concerns by using the products). The utilization of biological processes, organisms or systems to produce products that are anticipated to improve human lives is termed biotechnology. By contrast, bioengineering is generally thought of as a related field that more heavily emphasizes higher systems approaches (not necessarily the altering or using of biological materials directly) for interfacing with and utilizing living things. Bioengineering is the application of the principles of engineering and natural sciences to tissues, cells, and molecules. This can be considered as the use of knowledge from working with and manipulating biology to achieve a result that can improve functions in plants and animals. Relatedly, biomedical engineering is an overlapping field that often draws upon and applies biotechnology (by various definitions), especially in certain sub-fields of biomedical or chemical engineering such as tissue engineering, biopharmaceutical engineering, and genetic engineering.

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https://en.wikipedia.org/wiki/Cheese

Cheese

Production

Cheese is a dairy product produced in wide ranges of flavors, textures, and forms by coagulation of the milk protein casein. It comprises proteins and fat from milk, usually the milk of cows, buffalo, goats, or sheep. During production, milk is usually acidified and the enzymes of either rennet or bacterial enzymes with similar activity are added to cause the casein to coagulate. The solid curds are then separated from the liquid whey and pressed into finished cheese. Some cheeses have aromatic molds on the rind, the outer layer, or throughout. Over a thousand types of cheese exist and are produced in various countries. Their styles, textures and flavors depend on the origin of the milk (including the animal's diet), whether they have been pasteurized, the butterfat content, the bacteria and mold, the processing, and how long they have been aged for. Herbs, spices, or wood smoke may be used as flavoring agents. The yellow to red color of many cheeses is produced by adding annatto. Other ingredients may be added to some cheeses, such as black pepper, garlic, chives, or cranberries. A cheesemonger, or specialist seller of cheeses, may have expertise with selecting the cheeses, purchasing, receiving, storing and ripening them. For a few cheeses, the milk is curdled by adding acids such as vinegar or lemon juice. Most cheeses are acidified to a lesser degree by bacteria, which turn milk sugars into lactic acid, then the addition of rennet completes the curdling. Vegetarian alternatives to rennet are available; most are produced by fermentation of the fungus Mucor miehei, but others have been extracted from various species of the Cynara thistle family. Cheesemakers near a dairy region may benefit from fresher, lower-priced milk, and lower shipping costs. Cheese is valued for its portability, long shelf life, and high content of fat, protein, calcium, and phosphorus. Cheese is more compact and has a longer shelf life than milk, although how long a cheese will keep depends on the type of cheese. Hard cheeses, such as Parmesan, last longer than soft cheeses, such as Brie or goat's milk cheese. The long storage life of some cheeses, especially when encased in a protective rind, allows selling when markets are favorable. Vacuum packaging of block-shaped cheeses and gas-flushing of plastic bags with mixtures of carbon dioxide and nitrogen are used for storage and mass distribution of cheeses in the 21st century.

In 2014, world production of cheese from whole cow milk was 18.7 million tonnes, with the United States accounting for 29% (5.4 million tonnes) of the world total followed by Germany, France and Italy as major producers (table). Other 2014 world totals for processed cheese include: from skimmed cow milk, 2.4 million tonnes (leading country, Germany, 845,500 tonnes) from goat milk, 523,040 tonnes (leading country, South Sudan, 110,750 tonnes) from sheep milk, 680,302 tonnes (leading country, Greece, 125,000 tonnes) from buffalo milk, 282,127 tonnes (leading country, Egypt, 254,000 tonnes) During 2015, Germany, France, Netherlands and Italy exported 10–14% of their produced cheese. The United States was a marginal exporter (5.3% of total cow milk production), as most of its output was for the domestic market. The carbon footprint of a kilogram of cheese ranges from 6 to 12kg of CO2eq, depending on the amount of milk used; thus it is generally lower than beef or lamb but higher than other foods.

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https://en.wikipedia.org/wiki/Bronze%20Age

Bronze Age

Americas

The Bronze Age is a historic period, lasting approximately from 3300 BC to 1200 BC, characterized by the use of bronze, the presence of writing in some areas, and other early features of urban civilization. The Bronze Age is the second principal period of the three-age system proposed in 1836 by Christian Jürgensen Thomsen for classifying and studying ancient societies and history. An ancient civilization is deemed to be part of the Bronze Age because it either produced bronze by smelting its own copper and alloying it with tin, arsenic, or other metals, or traded other items for bronze from production areas elsewhere. Bronze was harder and more durable than other metals available at the time, allowing Bronze Age civilizations to gain a technological advantage. While terrestrial iron is naturally abundant, the higher temperature required for smelting, , in addition to the greater difficulty of working with the metal, placed it out of reach of common use until the end of the second millennium BC. Tin's low melting point of and copper's relatively moderate melting point of placed them within the capabilities of the Neolithic pottery kilns, which date back to 6,000 BC and were able to produce temperatures greater than . Copper and tin ores are rare, since there were no tin bronzes in Western Asia before trading in bronze began in the 3rd millennium BC. Worldwide, the Bronze Age generally followed the Neolithic period, with the Chalcolithic serving as a transition. Bronze Age cultures differed in their development of writing. According to archaeological evidence, cultures in Mesopotamia (cuneiform script) and Egypt (hieroglyphs) developed the earliest practical writing systems.

The Moche civilization of South America independently discovered and developed bronze smelting. Bronze technology was developed further by the Incas and used widely both for utilitarian objects and sculpture. A later appearance of limited bronze smelting in West Mexico suggests either contact of that region with Andean cultures or separate discovery of the technology. The Calchaquí people of Northwest Argentina had bronze technology.

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https://en.wikipedia.org/wiki/Charlie%20Chaplin

Charlie Chaplin

Filmography

Sir Charles Spencer Chaplin Jr. (16 April 188925 December 1977) was an English comic actor, filmmaker, and composer who rose to fame in the era of silent film. He became a worldwide icon through his screen persona, the Tramp, and is considered one of the film industry's most important figures. His career spanned more than 75 years, from childhood in the Victorian era until a year before his death in 1977, and encompassed both adulation and controversy. Chaplin's childhood in London was one of poverty and hardship. His father was absent and his mother struggled financially — he was sent to a workhouse twice before age nine. When he was 14, his mother was committed to a mental asylum. Chaplin began performing at an early age, touring music halls and later working as a stage actor and comedian. At 19, he was signed to the Fred Karno company, which took him to the United States. He was scouted for the film industry and began appearing in 1914 for Keystone Studios. He soon developed the Tramp persona and attracted a large fan base. He directed his own films and continued to hone his craft as he moved to the Essanay, Mutual, and First National corporations. By 1918, he was one of the world's best-known figures. In 1919, Chaplin co-founded distribution company United Artists, which gave him complete control over his films. His first feature-length film was The Kid (1921), followed by A Woman of Paris (1923), The Gold Rush (1925), and The Circus (1928). He initially refused to move to sound films in the 1930s, instead producing City Lights (1931) and Modern Times (1936) without dialogue. His first sound film was The Great Dictator (1940), which satirised Adolf Hitler. The 1940s were marked with controversy for Chaplin, and his popularity declined rapidly. He was accused of communist sympathies, and some members of the press and public were scandalized by his involvement in a paternity suit and marriages to much younger women. An FBI investigation was opened, and Chaplin was forced to leave the U.S. and settle in Switzerland. He abandoned the Tramp in his later films, which include Monsieur Verdoux (1947), Limelight (1952), A King in New York (1957), and A Countess from Hong Kong (1967). Chaplin wrote, directed, produced, edited, starred in, and composed the music for most of his films. He was a perfectionist, and his financial independence enabled him to spend years on the development and production of a picture. His films are characterised by slapstick combined with pathos, typified in the Tramp's struggles against adversity. Many contain social and political themes, as well as autobiographical elements. He received an Honorary Academy Award for "the incalculable effect he has had in making motion pictures the art form of this century" in 1972, as part of a renewed appreciation for his work. He continues to be held in high regard, with The Gold Rush, City Lights, Modern Times, and The Great Dictator often ranked on lists of the greatest films.

Directed features: The Kid (1921) A Woman of Paris (1923) The Gold Rush (1925) The Circus (1928) City Lights (1931) Modern Times (1936) The Great Dictator (1940) Monsieur Verdoux (1947) Limelight (1952) A King in New York (1957) A Countess from Hong Kong (1967)

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https://en.wikipedia.org/wiki/Colombia

Colombia

Etymology

Colombia (, ; ), officially the Republic of Colombia, is a country in South America with an insular region in North America. It is bordered by the Caribbean Sea to the north, Venezuela to the east, Brazil to the southeast, Ecuador and Peru to the south, the Pacific Ocean to the west and Panama to the northwest. Colombia comprises 32 departments and the Capital District of Bogotá, the country's largest city. It covers an area of , with a population of 50 million. Colombia's cultural heritage reflects influences by various Amerindian civilizations, European settlement, enslaved Africans, as well as immigration from Europe and the Middle East. Spanish is the nation's official language, besides which over 70 languages are spoken. Colombia has been inhabited by various indigenous peoples since at least 12,000 BCE, including the Muisca, Quimbaya and Tairona. The Spanish landed first in La Guajira in 1499 and by the mid-16th century colonized parts of the region, establishing the New Kingdom of Granada, with Santa Fé de Bogotá as its capital. Independence from the Spanish Empire was achieved in 1819, with what is now Colombia emerging as the United Provinces of New Granada. The new nation experimented with federalism as the Granadine Confederation (1858) and then the United States of Colombia (1863), before the Republic of Colombia was finally declared in 1886. Panama seceded in 1903, leading to Colombia's present borders. Beginning in the 1960s, the country has suffered from an asymmetric low-intensity armed conflict and political violence, both of which escalated in the 1990s. Since 2005, there has been significant improvement in security, stability and rule of law, as well as unprecedented economic growth and development. Colombia is one of the world's seventeen megadiverse countries; it has the second-highest level of biodiversity in the world. Its territory encompasses Amazon rainforest, highlands, grasslands and deserts. It is the only country in South America with coastlines and islands along both the Atlantic and Pacific oceans. Colombia is a member of major global and regional organizations including the UN, the WTO, the OECD, the OAS, the Pacific Alliance and the Andean Community; it is also a NATO Global Partner. Its diversified economy is the third-largest in South America, with macroeconomic stability and favorable long-term growth prospects.

The name "Colombia" is derived from the last name of the Italian navigator Christopher Columbus (, ). It was conceived as a reference to all of the New World. The name was later adopted by the Republic of Colombia of 1819, formed from the territories of the old Viceroyalty of New Granada (modern-day Colombia, Panama, Venezuela, Ecuador, and northwest Brazil). When Venezuela, Ecuador, and Cundinamarca came to exist as independent states, the former Department of Cundinamarca adopted the name "Republic of New Granada". New Granada officially changed its name in 1858 to the Granadine Confederation. In 1863 the name was again changed, this time to United States of Colombia, before finally adopting its present name – the Republic of Colombia – in 1886. To refer to this country, the Colombian government uses the terms and .

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projected-00050521-014

https://en.wikipedia.org/wiki/Sumer

Sumer

Population

Sumer () is the earliest known civilization in the historical region of southern Mesopotamia (south-central Iraq), emerging during the Chalcolithic and early Bronze Ages between the sixth and fifth millennium BC. It is one of the cradles of civilization in the world, along with ancient Egypt, Elam, the Caral-Supe civilization, Mesoamerica, the Indus Valley civilisation, and ancient China. Living along the valleys of the Tigris and Euphrates rivers, Sumerian farmers grew an abundance of grain and other crops, the surplus from which enabled them to form urban settlements. Proto-writing dates back before 3000 BC. The earliest texts come from the cities of Uruk and Jemdet Nasr, and date to between c. 3500 and c. 3000 BC.

Uruk, one of Sumer's largest cities, has been estimated to have had a population of 50,000–80,000 at its height; given the other cities in Sumer, and the large agricultural population, a rough estimate for Sumer's population might be 0.8 million to 1.5 million. The world population at this time has been estimated at 27 million. The Sumerians spoke a language isolate, but a number of linguists have claimed to be able to detect a substrate language of unknown classification beneath Sumerian because names of some of Sumer's major cities are not Sumerian, revealing influences of earlier inhabitants. However, the archaeological record shows clear uninterrupted cultural continuity from the time of the early Ubaid period (5300–4700 BC C-14) settlements in southern Mesopotamia. The Sumerian people who settled here farmed the lands in this region that were made fertile by silt deposited by the Tigris and the Euphrates. Some archaeologists have speculated that the original speakers of ancient Sumerian may have been farmers, who moved down from the north of Mesopotamia after perfecting irrigation agriculture there. The Ubaid period pottery of southern Mesopotamia has been connected via Choga Mami transitional ware to the pottery of the Samarra period culture (c. 5700–4900 BC C-14) in the north, who were the first to practice a primitive form of irrigation agriculture along the middle Tigris River and its tributaries. The connection is most clearly seen at Tell el-'Oueili near Larsa, excavated by the French in the 1980s, where eight levels yielded pre-Ubaid pottery resembling Samarran ware. According to this theory, farming peoples spread down into southern Mesopotamia because they had developed a temple-centered social organization for mobilizing labor and technology for water control, enabling them to survive and prosper in a difficult environment. Others have suggested a continuity of Sumerians, from the indigenous hunter-fisherfolk traditions, associated with the bifacial assemblages found on the Arabian littoral. Juris Zarins believes the Sumerians may have been the people living in the Persian Gulf region before it flooded at the end of the last Ice Age.

wit-train-topic-004284151

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https://en.wikipedia.org/wiki/Canal

Canal

Construction

Canals or artificial waterways are waterways or engineered channels built for drainage management (e.g. flood control and irrigation) or for conveyancing water transport vehicles (e.g. water taxi). They carry free, calm surface flow under atmospheric pressure, and can be thought of as artificial rivers. In most cases, a canal has a series of dams and locks that create reservoirs of low speed current flow. These reservoirs are referred to as slack water levels, often just called levels. A canal can be called a navigation canal when it parallels a natural river and shares part of the latter's discharges and drainage basin, and leverages its resources by building dams and locks to increase and lengthen its stretches of slack water levels while staying in its valley. A canal can cut across a drainage divide atop a ridge, generally requiring an external water source above the highest elevation. The best-known example of such a canal is the Panama Canal. Many canals have been built at elevations, above valleys and other waterways. Canals with sources of water at a higher level can deliver water to a destination such as a city where water is needed. The Roman Empire's aqueducts were such water supply canals.

Canals are built in one of three ways, or a combination of the three, depending on available water and available path: Human made streams A canal can be created where no stream presently exists. Either the body of the canal is dug or the sides of the canal are created by making dykes or levees by piling dirt, stone, concrete or other building materials. The finished shape of the canal as seen in cross section is known as the canal prism. The water for the canal must be provided from an external source, like streams or reservoirs. Where the new waterway must change elevation engineering works like locks, lifts or elevators are constructed to raise and lower vessels. Examples include canals that connect valleys over a higher body of land, like Canal du Midi, Canal de Briare and the Panama Canal. A canal can be constructed by dredging a channel in the bottom of an existing lake. When the channel is complete, the lake is drained and the channel becomes a new canal, serving both drainage of the surrounding polder and providing transport there. Examples include the . One can also build two parallel dikes in an existing lake, forming the new canal in between, and then drain the remaining parts of the lake. The eastern and central parts of the North Sea Canal were constructed in this way. In both cases pumping stations are required to keep the land surrounding the canal dry, either pumping water from the canal into surrounding waters, or pumping it from the land into the canal. Canalization and navigations A stream can be canalized to make its navigable path more predictable and easier to maneuver. Canalization modifies the stream to carry traffic more safely by controlling the flow of the stream by dredging, damming and modifying its path. This frequently includes the incorporation of locks and spillways, that make the river a navigation. Examples include the Lehigh Canal in Northeastern Pennsylvania's coal Region, Basse Saône, Canal de Mines de Fer de la Moselle, and Aisne River. Riparian zone restoration may be required. Lateral canals When a stream is too difficult to modify with canalization, a second stream can be created next to or at least near the existing stream. This is called a lateral canal, and may meander in a large horseshoe bend or series of curves some distance from the source waters stream bed lengthening the effective length in order to lower the ratio of rise over run (slope or pitch). The existing stream usually acts as the water source and the landscape around its banks provide a path for the new body. Examples include the Chesapeake and Ohio Canal, Canal latéral à la Loire, Garonne Lateral Canal, Welland Canal and Juliana Canal. Smaller transportation canals can carry barges or narrowboats, while ship canals allow seagoing ships to travel to an inland port (e.g., Manchester Ship Canal), or from one sea or ocean to another (e.g., Caledonian Canal, Panama Canal).

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https://en.wikipedia.org/wiki/Cold%20War

Cold War

In popular culture

The Cold War is a term commonly used to refer to a period of geopolitical tension between the United States and the Soviet Union and their respective allies, the Western Bloc and the Eastern Bloc. Historians do not fully agree on its starting and ending points, but the period is generally considered to span from the announcement of the Truman Doctrine on 12 March 1947 to the dissolution of the Soviet Union on 26 December 1991. The term cold war is used because there was no large-scale fighting directly between the two superpowers, but they each supported major regional conflicts known as proxy wars. The conflict was based around the ideological and geopolitical struggle for global influence by these two superpowers, following their temporary alliance and victory against Nazi Germany and Imperial Japan in 1945. Aside from the nuclear arsenal development and conventional military deployment, the struggle for dominance was expressed via indirect means such as psychological warfare, propaganda campaigns, espionage, far-reaching embargoes, rivalry at sports events, and technological competitions such as the Space Race. The Western Bloc was led by the United States as well as a number of other First World nations that were generally liberal democratic but tied to a network of authoritarian states, most of which were their former colonies. The Eastern Bloc was led by the Soviet Union and its Communist Party, which had an influence across the Second World and was also tied to a network of authoritarian states. The US government supported anti-communist and right-wing governments and uprisings across the world, while the Soviet government funded left-wing parties and revolutions around the world. As nearly all the colonial states achieved independence in the period from 1945 to 1960, they became Third World battlefields in the Cold War. The first phase of the Cold War began shortly after the end of World War II in 1945. The United States and its allies created the NATO military alliance in 1949 in the apprehension of a Soviet attack and termed their global policy against Soviet influence containment. The Soviet Union formed the Warsaw Pact in 1955 in response to NATO. Major crises of this phase included the 1948–1949 Berlin Blockade, the 1945–1949 Chinese Communist Revolution, the 1950–1953 Korean War, the 1956 Hungarian Revolution, the 1956 Suez Crisis, the 1961 Berlin Crisis, the 1962 Cuban Missile Crisis, and the 1964–1975 Vietnam War. The US and the USSR competed for influence in Latin America, the Middle East, and the decolonizing states of Africa, Asia, and Oceania. Following the Cuban Missile Crisis, a new phase began that saw the Sino-Soviet split between China and the Soviet Union complicate relations within the Communist sphere leading to a series of border confrontations, while France, a Western Bloc state, began to demand greater autonomy of action. The USSR invaded Czechoslovakia to suppress the 1968 Prague Spring, while the US experienced internal turmoil from the civil rights movement and opposition to the Vietnam War. In the 1960s–1970s, an international peace movement took root among citizens around the world. Movements against nuclear weapons testing and for nuclear disarmament took place, with large anti-war protests. By the 1970s, both sides had started making allowances for peace and security, ushering in a period of détente that saw the Strategic Arms Limitation Talks and the US opening relations with the People's Republic of China as a strategic counterweight to the USSR. A number of self-proclaimed Marxist–Leninist governments were formed in the second half of the 1970s in the Third World, including Angola, Mozambique, Ethiopia, Cambodia, Afghanistan, and Nicaragua. Détente collapsed at the end of the decade with the beginning of the Soviet–Afghan War in 1979. The early 1980s was another period of elevated tension. The United States increased diplomatic, military, and economic pressures on the Soviet Union, at a time when it was already suffering from economic stagnation. In the mid-1980s, the new Soviet leader Mikhail Gorbachev introduced the liberalizing reforms of glasnost ("openness", c. 1985) and perestroika ("reorganization", 1987) and ended Soviet involvement in Afghanistan in 1989. Pressures for national sovereignty grew stronger in Eastern Europe, and Gorbachev refused to militarily support their governments any longer. In 1989, the fall of the Iron Curtain after the Pan-European Picnic and a peaceful wave of revolutions (with the exception of Romania and Afghanistan) overthrew almost all communist governments of the Eastern Bloc. The Communist Party of the Soviet Union itself lost control in the country and was banned following an abortive coup attempt in August 1991. This in turn led to the formal dissolution of the USSR in December 1991, the declaration of independence of its constituent republics and the collapse of communist governments across much of Africa and Asia. The United States was left as the world's sole superpower. The Cold War and its events have left a significant legacy. It is often referred to in popular culture, especially with themes of espionage and the threat of nuclear warfare. For subsequent history, see international relations since 1989.

During the Cold War, the United States and the Soviet Union invested heavily in propaganda designed to influence people around the world, especially using motion pictures. The Cold War endures as a popular topic reflected extensively in entertainment media, and continuing to the present with numerous post-1991 Cold War-themed feature films, novels, television, and other media. In 2013, a KGB-sleeper-agents-living-next-door action drama series, The Americans, set in the early 1980s, was ranked No. 6 on the Metacritic annual Best New TV Shows list; its six-season run concluded in May 2018.

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https://en.wikipedia.org/wiki/Cold%20War

Cold War

Historiography

The Cold War is a term commonly used to refer to a period of geopolitical tension between the United States and the Soviet Union and their respective allies, the Western Bloc and the Eastern Bloc. Historians do not fully agree on its starting and ending points, but the period is generally considered to span from the announcement of the Truman Doctrine on 12 March 1947 to the dissolution of the Soviet Union on 26 December 1991. The term cold war is used because there was no large-scale fighting directly between the two superpowers, but they each supported major regional conflicts known as proxy wars. The conflict was based around the ideological and geopolitical struggle for global influence by these two superpowers, following their temporary alliance and victory against Nazi Germany and Imperial Japan in 1945. Aside from the nuclear arsenal development and conventional military deployment, the struggle for dominance was expressed via indirect means such as psychological warfare, propaganda campaigns, espionage, far-reaching embargoes, rivalry at sports events, and technological competitions such as the Space Race. The Western Bloc was led by the United States as well as a number of other First World nations that were generally liberal democratic but tied to a network of authoritarian states, most of which were their former colonies. The Eastern Bloc was led by the Soviet Union and its Communist Party, which had an influence across the Second World and was also tied to a network of authoritarian states. The US government supported anti-communist and right-wing governments and uprisings across the world, while the Soviet government funded left-wing parties and revolutions around the world. As nearly all the colonial states achieved independence in the period from 1945 to 1960, they became Third World battlefields in the Cold War. The first phase of the Cold War began shortly after the end of World War II in 1945. The United States and its allies created the NATO military alliance in 1949 in the apprehension of a Soviet attack and termed their global policy against Soviet influence containment. The Soviet Union formed the Warsaw Pact in 1955 in response to NATO. Major crises of this phase included the 1948–1949 Berlin Blockade, the 1945–1949 Chinese Communist Revolution, the 1950–1953 Korean War, the 1956 Hungarian Revolution, the 1956 Suez Crisis, the 1961 Berlin Crisis, the 1962 Cuban Missile Crisis, and the 1964–1975 Vietnam War. The US and the USSR competed for influence in Latin America, the Middle East, and the decolonizing states of Africa, Asia, and Oceania. Following the Cuban Missile Crisis, a new phase began that saw the Sino-Soviet split between China and the Soviet Union complicate relations within the Communist sphere leading to a series of border confrontations, while France, a Western Bloc state, began to demand greater autonomy of action. The USSR invaded Czechoslovakia to suppress the 1968 Prague Spring, while the US experienced internal turmoil from the civil rights movement and opposition to the Vietnam War. In the 1960s–1970s, an international peace movement took root among citizens around the world. Movements against nuclear weapons testing and for nuclear disarmament took place, with large anti-war protests. By the 1970s, both sides had started making allowances for peace and security, ushering in a period of détente that saw the Strategic Arms Limitation Talks and the US opening relations with the People's Republic of China as a strategic counterweight to the USSR. A number of self-proclaimed Marxist–Leninist governments were formed in the second half of the 1970s in the Third World, including Angola, Mozambique, Ethiopia, Cambodia, Afghanistan, and Nicaragua. Détente collapsed at the end of the decade with the beginning of the Soviet–Afghan War in 1979. The early 1980s was another period of elevated tension. The United States increased diplomatic, military, and economic pressures on the Soviet Union, at a time when it was already suffering from economic stagnation. In the mid-1980s, the new Soviet leader Mikhail Gorbachev introduced the liberalizing reforms of glasnost ("openness", c. 1985) and perestroika ("reorganization", 1987) and ended Soviet involvement in Afghanistan in 1989. Pressures for national sovereignty grew stronger in Eastern Europe, and Gorbachev refused to militarily support their governments any longer. In 1989, the fall of the Iron Curtain after the Pan-European Picnic and a peaceful wave of revolutions (with the exception of Romania and Afghanistan) overthrew almost all communist governments of the Eastern Bloc. The Communist Party of the Soviet Union itself lost control in the country and was banned following an abortive coup attempt in August 1991. This in turn led to the formal dissolution of the USSR in December 1991, the declaration of independence of its constituent republics and the collapse of communist governments across much of Africa and Asia. The United States was left as the world's sole superpower. The Cold War and its events have left a significant legacy. It is often referred to in popular culture, especially with themes of espionage and the threat of nuclear warfare. For subsequent history, see international relations since 1989.

As soon as the term "Cold War" was popularized to refer to post-war tensions between the United States and the Soviet Union, interpreting the course and origins of the conflict has been a source of heated controversy among historians, political scientists, and journalists. In particular, historians have sharply disagreed as to who was responsible for the breakdown of Soviet–US relations after the Second World War; and whether the conflict between the two superpowers was inevitable, or could have been avoided. Historians have also disagreed on what exactly the Cold War was, what the sources of the conflict were, and how to disentangle patterns of action and reaction between the two sides. Although explanations of the origins of the conflict in academic discussions are complex and diverse, several general schools of thought on the subject can be identified. Historians commonly speak of three different approaches to the study of the Cold War: "orthodox" accounts, "revisionism", and "post-revisionism". "Orthodox" accounts place responsibility for the Cold War on the Soviet Union and its expansion further into Europe. "Revisionist" writers place more responsibility for the breakdown of post-war peace on the United States, citing a range of US efforts to isolate and confront the Soviet Union well before the end of World War II. "Post-revisionists" see the events of the Cold War as more nuanced, and attempt to be more balanced in determining what occurred during the Cold War. Much of the historiography on the Cold War weaves together two or even all three of these broad categories.

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https://en.wikipedia.org/wiki/Complex%20number

Complex number

Notation

In mathematics, a complex number is an element of a number system that extends the real numbers with a specific element denoted , called the imaginary unit and satisfying the equation ; every complex number can be expressed in the form , where and are real numbers. Because no real number satisfies the above equation, was called an imaginary number by René Descartes. For the complex number , is called the and is called the . The set of complex numbers is denoted by either of the symbols or . Despite the historical nomenclature "imaginary", complex numbers are regarded in the mathematical sciences as just as "real" as the real numbers and are fundamental in many aspects of the scientific description of the natural world. Complex numbers allow solutions to all polynomial equations, even those that have no solutions in real numbers. More precisely, the fundamental theorem of algebra asserts that every non-constant polynomial equation with real or complex coefficients has a solution which is a complex number. For example, the equation has no real solution, since the square of a real number cannot be negative, but has the two nonreal complex solutions and . Addition, subtraction and multiplication of complex numbers can be naturally defined by using the rule combined with the associative, commutative and distributive laws. Every nonzero complex number has a multiplicative inverse. This makes the complex numbers a field that has the real numbers as a subfield. The complex numbers also form a real vector space of dimension two, with as a standard basis. This standard basis makes the complex numbers a Cartesian plane, called the complex plane. This allows a geometric interpretation of the complex numbers and their operations, and conversely expressing in terms of complex numbers some geometric properties and constructions. For example, the real numbers form the real line which is identified to the horizontal axis of the complex plane. The complex numbers of absolute value one form the unit circle. The addition of a complex number is a translation in the complex plane, and the multiplication by a complex number is a similarity centered at the origin. The complex conjugation is the reflection symmetry with respect to the real axis. The complex absolute value is a Euclidean norm. In summary, the complex numbers form a rich structure that is simultaneously an algebraically closed field, a commutative algebra over the reals, and a Euclidean vector space of dimension two.

A real number can be regarded as a complex number , whose imaginary part is 0. A purely imaginary number is a complex number , whose real part is zero. As with polynomials, it is common to write for and for . Moreover, when the imaginary part is negative, that is, , it is common to write instead of ; for example, for , can be written instead of . Since the multiplication of the indeterminate and a real is commutative in polynomials with real coefficients, the polynomial may be written as This is often expedient for imaginary parts denoted by expressions, for example, when is a radical. The real part of a complex number is denoted by , , or ; the imaginary part of a complex number is denoted by , , or For example, The set of all complex numbers is denoted by (blackboard bold) or (upright bold). In some disciplines, particularly in electromagnetism and electrical engineering, is used instead of as is frequently used to represent electric current. In these cases, complex numbers are written as , or .

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https://en.wikipedia.org/wiki/Catalysis

Catalysis

History

Catalysis () is the process of increasing the rate of a chemical reaction by adding a substance known as a catalyst (). Catalysts are not consumed in the reaction and remain unchanged after it. If the reaction is rapid and the catalyst recycles quickly, very small amounts of catalyst often suffice; mixing, surface area, and temperature are important factors in reaction rate. Catalysts generally react with one or more reactants to form intermediates that subsequently give the final reaction product, in the process regenerating the catalyst. Catalysis may be classified as either homogeneous, whose components are dispersed in the same phase (usually gaseous or liquid) as the reactant, or heterogeneous, whose components are not in the same phase. Enzymes and other biocatalysts are often considered as a third category. Catalysis is ubiquitous in chemical industry of all kinds. Estimates are that 90% of all commercially produced chemical products involve catalysts at some stage in the process of their manufacture. The term "catalyst" is derived from Greek , kataluein, meaning "loosen" or "untie". The concept of catalysis was invented by chemist Elizabeth Fulhame, based on her novel work in oxidation-reduction experiments.

Generally speaking, anything that increases the rate of a process is a "catalyst", a term derived from Greek καταλύειν, meaning "to annul," or "to untie," or "to pick up." The concept of catalysis was invented by chemist Elizabeth Fulhame and described in a 1794 book, based on her novel work in oxidation-reduction experiments. The first chemical reaction in organic chemistry that utilized a catalyst was studied in 1811 by Gottlieb Kirchhoff who discovered the acid-catalyzed conversion of starch to glucose. The term catalysis was later used by Jöns Jakob Berzelius in 1835 to describe reactions that are accelerated by substances that remain unchanged after the reaction. Fulhame, who predated Berzelius, did work with water as opposed to metals in her reduction experiments. Other 18th century chemists who worked in catalysis were Eilhard Mitscherlich who referred to it as contact processes, and Johann Wolfgang Döbereiner who spoke of contact action. He developed Döbereiner's lamp, a lighter based on hydrogen and a platinum sponge, which became a commercial success in the 1820s that lives on today. Humphry Davy discovered the use of platinum in catalysis. In the 1880s, Wilhelm Ostwald at Leipzig University started a systematic investigation into reactions that were catalyzed by the presence of acids and bases, and found that chemical reactions occur at finite rates and that these rates can be used to determine the strengths of acids and bases. For this work, Ostwald was awarded the 1909 Nobel Prize in Chemistry. Vladimir Ipatieff performed some of the earliest industrial scale reactions, including the discovery and commercialization of oligomerization and the development of catalysts for hydrogenation.

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https://en.wikipedia.org/wiki/Carbohydrate

Carbohydrate

Division

In organic chemistry, a carbohydrate () is a biomolecule consisting of carbon (C), hydrogen (H) and oxygen (O) atoms, usually with a hydrogen–oxygen atom ratio of 2:1 (as in water) and thus with the empirical formula (where m may or may not be different from n). However, not all carbohydrates conform to this precise stoichiometric definition (e.g., uronic acids, deoxy-sugars such as fucose), nor are all chemicals that do conform to this definition automatically classified as carbohydrates (e.g. formaldehyde and acetic acid). The term is most common in biochemistry, where it is a synonym of saccharide (), a group that includes sugars, starch, and cellulose. The saccharides are divided into four chemical groups: monosaccharides, disaccharides, oligosaccharides, and polysaccharides. Monosaccharides and disaccharides, the smallest (lower molecular weight) carbohydrates, are commonly referred to as sugars. While the scientific nomenclature of carbohydrates is complex, the names of the monosaccharides and disaccharides very often end in the suffix -ose, which was originally taken from glucose (), and is used for almost all sugars, e.g. fructose (fruit sugar), sucrose (cane or beet sugar), ribose, lactose (milk sugar), etc. Carbohydrates perform numerous roles in living organisms. Polysaccharides serve as an energy store (e.g. starch and glycogen) and as structural components (e.g. cellulose in plants and chitin in arthropods). The 5-carbon monosaccharide ribose is an important component of coenzymes (e.g. ATP, FAD and NAD) and the backbone of the genetic molecule known as RNA. The related deoxyribose is a component of DNA. Saccharides and their derivatives include many other important biomolecules that play key roles in the immune system, fertilization, preventing pathogenesis, blood clotting, and development. Carbohydrates are central to nutrition and are found in a wide variety of natural and processed foods. Starch is a polysaccharide and is abundant in cereals (wheat, maize, rice), potatoes, and processed food based on cereal flour, such as bread, pizza or pasta. Sugars appear in human diet mainly as table sugar (sucrose, extracted from sugarcane or sugar beets), lactose (abundant in milk), glucose and fructose, both of which occur naturally in honey, many fruits, and some vegetables. Table sugar, milk, or honey are often added to drinks and many prepared foods such as jam, biscuits and cakes. Cellulose, a polysaccharide found in the cell walls of all plants, is one of the main components of insoluble dietary fiber. Although it is not digestible by humans, cellulose and insoluble dietary fiber generally help maintain a healthy digestive system by facilitating bowel movements. Other polysaccharides contained in dietary fiber include resistant starch and inulin, which feed some bacteria in the microbiota of the large intestine, and are metabolized by these bacteria to yield short-chain fatty acids.

Carbohydrates are polyhydroxy aldehydes, ketones, alcohols, acids, their simple derivatives and their polymers having linkages of the acetal type. They may be classified according to their degree of polymerization, and may be divided initially into three principal groups, namely sugars, oligosaccharides and polysaccharides.

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https://en.wikipedia.org/wiki/Space%20station

Space station

Architecture

A space station is a spacecraft capable of supporting a human crew in orbit for an extended period of time, and is therefore a type of space habitat. It lacks major propulsion or landing systems. An orbital station or an orbital space station is an artificial satellite (i.e. a type of orbital spaceflight). Stations must have docking ports to allow other spacecraft to dock to transfer crew and supplies. The purpose of maintaining an orbital outpost varies depending on the program. Space stations have most often been launched for scientific purposes, but military launches have also occurred. Space stations have harboured so far the only long-duration direct human presence in space. After the first station Salyut 1 (1971) and its tragic Soyuz 11 crew, space stations have been operated consecutively since Skylab (1973), having allowed a progression of long-duration direct human presence in space. Stations have been occupied by consecutive crews since 1987 with the Salyut successor Mir. Uninterrupted occupation of stations has been achieved since the operational transition from the Mir to the ISS, with its first occupation in 2000. The ISS has hosted the highest number of people in orbit at the same time, reaching 13 for the first time during the eleven day docking of STS-127 in 2009. , there are two fully operational space stations in low Earth orbit (LEO) – the International Space Station (ISS) and China's Tiangong Space Station (TSS). The ISS has been permanently inhabited since October 2000 with the Expedition 1 crews and the TSS began continuous inhabitation with the Shenzhou 14 crews in June 2022. The ISS is used to study the effects of spaceflight on the human body, as well as to provide a location to conduct a greater number and longer length of scientific studies than is possible on other space vehicles. China's Tiangong Space Station is scheduled to finish its phase 1 construction by the end of 2022 with the addition of two lab modules. In July 2022, Russia announced intentions to withdraw from the ISS after 2024 in order to build its own space station. There have been numerous decommissioned space stations, including USSR's Salyuts, Russia's Mir, NASA's Skylab, and China's Tiangong 1 and Tiangong 2.

Two types of space stations have been flown: monolithic and modular. Monolithic stations consist of a single vehicle and are launched by one rocket. Modular stations consist of two or more separate vehicles that are launched independently and docked on orbit. Modular stations are currently preferred due to lower costs and greater flexibility. A space station is a complex vehicle that must incorporate many interrelated subsystems, including structure, electrical power, thermal control, attitude determination and control, orbital navigation and propulsion, automation and robotics, computing and communications, environmental and life support, crew facilities, and crew and cargo transportation. Stations must serve a useful role, which drives the capabilities required.

wit-train-topic-001251986

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https://en.wikipedia.org/wiki/Comet

Comet

Observation

A comet is an icy, small Solar System body that, when passing close to the Sun, warms and begins to release gases, a process that is called outgassing. This produces a visible atmosphere or coma, and sometimes also a tail. These phenomena are due to the effects of solar radiation and the solar wind acting upon the nucleus of the comet. Comet nuclei range from a few hundred meters to tens of kilometers across and are composed of loose collections of ice, dust, and small rocky particles. The coma may be up to 15 times Earth's diameter, while the tail may stretch beyond one astronomical unit. If sufficiently bright, a comet may be seen from Earth without the aid of a telescope and may subtend an arc of 30° (60 Moons) across the sky. Comets have been observed and recorded since ancient times by many cultures and religions. Comets usually have highly eccentric elliptical orbits, and they have a wide range of orbital periods, ranging from several years to potentially several millions of years. Short-period comets originate in the Kuiper belt or its associated scattered disc, which lie beyond the orbit of Neptune. Long-period comets are thought to originate in the Oort cloud, a spherical cloud of icy bodies extending from outside the Kuiper belt to halfway to the nearest star. Long-period comets are set in motion towards the Sun from the Oort cloud by gravitational perturbations caused by passing stars and the galactic tide. Hyperbolic comets may pass once through the inner Solar System before being flung to interstellar space. The appearance of a comet is called an apparition. Comets are distinguished from asteroids by the presence of an extended, gravitationally unbound atmosphere surrounding their central nucleus. This atmosphere has parts termed the coma (the central part immediately surrounding the nucleus) and the tail (a typically linear section consisting of dust or gas blown out from the coma by the Sun's light pressure or outstreaming solar wind plasma). However, extinct comets that have passed close to the Sun many times have lost nearly all of their volatile ices and dust and may come to resemble small asteroids. Asteroids are thought to have a different origin from comets, having formed inside the orbit of Jupiter rather than in the outer Solar System. The discovery of main-belt comets and active centaur minor planets has blurred the distinction between asteroids and comets. In the early 21st century, the discovery of some minor bodies with long-period comet orbits, but characteristics of inner solar system asteroids, were called Manx comets. They are still classified as comets, such as C/2014 S3 (PANSTARRS). 27 Manx comets were found from 2013 to 2017. there are 4584 known comets. However, this represents only a tiny fraction of the total potential comet population, as the reservoir of comet-like bodies in the outer Solar System (in the Oort cloud) is estimated to be one trillion. Roughly one comet per year is visible to the naked eye, though many of those are faint and unspectacular. Particularly bright examples are called "great comets". Comets have been visited by unmanned probes such as the European Space Agency's Rosetta, which became the first to land a robotic spacecraft on a comet, and NASA's Deep Impact, which blasted a crater on Comet Tempel 1 to study its interior.

A comet may be discovered photographically using a wide-field telescope or visually with binoculars. However, even without access to optical equipment, it is still possible for the amateur astronomer to discover a sungrazing comet online by downloading images accumulated by some satellite observatories such as SOHO. SOHO's 2000th comet was discovered by Polish amateur astronomer Michał Kusiak on 26 December 2010 and both discoverers of Hale–Bopp used amateur equipment (although Hale was not an amateur).

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https://en.wikipedia.org/wiki/Chemical%20bond

Chemical bond

Theories of chemical bonding

A chemical bond is a lasting attraction between atoms, ions or molecules that enables the formation of molecules. The bond may result from the electrostatic force between oppositely charged ions as in ionic bonds or through the sharing of electrons as in covalent bonds. The strength of chemical bonds varies considerably; there are "strong bonds" or "primary bonds" such as covalent, ionic and metallic bonds, and "weak bonds" or "secondary bonds" such as dipole–dipole interactions, the London dispersion force and hydrogen bonding. Since opposite charges attract via a simple electromagnetic force, the negatively charged electrons orbiting the nucleus and the positively charged protons in the nucleus attract each other. An electron positioned between two nuclei will be attracted to both of them, and the nuclei will be attracted toward electrons in this position. This attraction constitutes the chemical bond. Due to the matter wave nature of electrons and their smaller mass, they must occupy a much larger amount of volume compared with the nuclei, and this volume occupied by the electrons keeps the atomic nuclei in a bond relatively far apart, as compared with the size of the nuclei themselves. In general, strong chemical bonding is associated with the sharing or transfer of electrons between the participating atoms. The atoms in molecules, crystals, metals and diatomic gases—indeed most of the physical environment around us—are held together by chemical bonds, which dictate the structure and the bulk properties of matter. All bonds can be explained by quantum theory, but, in practice, simplification rules allow chemists to predict the strength, directionality, and polarity of bonds. The octet rule and VSEPR theory are two examples. More sophisticated theories are valence bond theory, which includes orbital hybridization and resonance, and molecular orbital theory which includes linear combination of atomic orbitals and ligand field theory. Electrostatics are used to describe bond polarities and the effects they have on chemical substances.

In the (unrealistic) limit of "pure" ionic bonding, electrons are perfectly localized on one of the two atoms in the bond. Such bonds can be understood by classical physics. The forces between the atoms are characterized by isotropic continuum electrostatic potentials. Their magnitude is in simple proportion to the charge difference. Covalent bonds are better understood by valence bond (VB) theory or molecular orbital (MO) theory. The properties of the atoms involved can be understood using concepts such as oxidation number, formal charge, and electronegativity. The electron density within a bond is not assigned to individual atoms, but is instead delocalized between atoms. In valence bond theory, bonding is conceptualized as being built up from electron pairs that are localized and shared by two atoms via the overlap of atomic orbitals. The concepts of orbital hybridization and resonance augment this basic notion of the electron pair bond. In molecular orbital theory, bonding is viewed as being delocalized and apportioned in orbitals that extend throughout the molecule and are adapted to its symmetry properties, typically by considering linear combinations of atomic orbitals (LCAO). Valence bond theory is more chemically intuitive by being spatially localized, allowing attention to be focused on the parts of the molecule undergoing chemical change. In contrast, molecular orbitals are more "natural" from a quantum mechanical point of view, with orbital energies being physically significant and directly linked to experimental ionization energies from photoelectron spectroscopy. Consequently, valence bond theory and molecular orbital theory are often viewed as competing but complementary frameworks that offer different insights into chemical systems. As approaches for electronic structure theory, both MO and VB methods can give approximations to any desired level of accuracy, at least in principle. However, at lower levels, the approximations differ, and one approach may be better suited for computations involving a particular system or property than the other. Unlike the spherically symmetrical Coulombic forces in pure ionic bonds, covalent bonds are generally directed and anisotropic. These are often classified based on their symmetry with respect to a molecular plane as sigma bonds and pi bonds. In the general case, atoms form bonds that are intermediate between ionic and covalent, depending on the relative electronegativity of the atoms involved. Bonds of this type are known as polar covalent bonds.

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https://en.wikipedia.org/wiki/Climate

Climate

Definition

Climate is the long-term weather pattern in an area, typically averaged over 30 years. More rigorously, it is the mean and variability of meteorological variables over a time spanning from months to millions of years. Some of the meteorological variables that are commonly measured are temperature, humidity, atmospheric pressure, wind, and precipitation. In a broader sense, climate is the state of the components of the climate system, including the atmosphere, hydrosphere, cryosphere, lithosphere and biosphere and the interactions between them. The climate of a location is affected by its latitude/longitude, terrain, altitude, land use and nearby water bodies and their currents. Climates can be classified according to the average and typical variables, most commonly temperature and precipitation. The most widely used classification scheme was the Köppen climate classification. The Thornthwaite system, in use since 1948, incorporates evapotranspiration along with temperature and precipitation information and is used in studying biological diversity and how climate change affects it. Finally, the Bergeron and Spatial Synoptic Classification systems focus on the origin of air masses that define the climate of a region. Paleoclimatology is the study of ancient climates. Paleoclimatologists seek to explain climate variations for all parts of the Earth during any given geologic period, beginning with the time of the Earth's formation. Since very few direct observations of climate were available before the 19th century, paleoclimates are inferred from proxy variables. They include non-biotic evidence—such as sediments found in lake beds and ice cores—and biotic evidence—such as tree rings and coral. Climate models are mathematical models of past, present, and future climates. Climate change may occur over long and short timescales from various factors. Recent warming is discussed in global warming, which results in redistributions. For example, "a 3 °C [5 °F] change in mean annual temperature corresponds to a shift in isotherms of approximately in latitude (in the temperate zone) or in elevation. Therefore, species are expected to move upwards in elevation or towards the poles in latitude in response to shifting climate zones."

Climate () is commonly defined as the weather averaged over a long period. The standard averaging period is 30 years, but other periods may be used depending on the purpose. Climate also includes statistics other than the average, such as the magnitudes of day-to-day or year-to-year variations. The Intergovernmental Panel on Climate Change (IPCC) 2001 glossary definition is as follows: The World Meteorological Organization (WMO) describes "climate normals" as "reference points used by climatologists to compare current climatological trends to that of the past or what is considered typical. A climate normal is defined as the arithmetic average of a climate element (e.g. temperature) over a 30-year period. A 30-year period is used as it is long enough to filter out any interannual variation or anomalies such as El Niño–Southern Oscillation, but also short enough to be able to show longer climatic trends." The WMO originated from the International Meteorological Organization which set up a technical commission for climatology in 1929. At its 1934 Wiesbaden meeting the technical commission designated the thirty-year period from 1901 to 1930 as the reference time frame for climatological standard normals. In 1982 the WMO agreed to update climate normals, and these were subsequently completed on the basis of climate data from 1 January 1961 to 31 December 1990. The 1961-1990 climate normals serve as the baseline reference period. The next set of climate normals to be published by WMO is from 1991 to 2010. Aside from collecting from the most common atmospheric variables (air temperature, pressure, precipitation and wind), other variables such as humidity, visibility, cloud amount, solar radiation, soil temperature, pan evaporation rate, days with thunder and days with hail are also collected to measure change in climate conditions. The difference between climate and weather is usefully summarized by the popular phrase "Climate is what you expect, weather is what you get." Over historical time spans, there are a number of nearly constant variables that determine climate, including latitude, altitude, proportion of land to water, and proximity to oceans and mountains. All of these variables change only over periods of millions of years due to processes such as plate tectonics. Other climate determinants are more dynamic: the thermohaline circulation of the ocean leads to a warming of the northern Atlantic Ocean compared to other ocean basins. Other ocean currents redistribute heat between land and water on a more regional scale. The density and type of vegetation coverage affects solar heat absorption, water retention, and rainfall on a regional level. Alterations in the quantity of atmospheric greenhouse gases determines the amount of solar energy retained by the planet, leading to global warming or global cooling. The variables which determine climate are numerous and the interactions complex, but there is general agreement that the broad outlines are understood, at least insofar as the determinants of historical climate change are concerned.

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https://en.wikipedia.org/wiki/Carl%20Friedrich%20Gauss

Carl Friedrich Gauss

Anecdotes

Johann Carl Friedrich Gauss (; ; ; 30 April 177723 February 1855) was a German mathematician and physicist who made significant contributions to many fields in mathematics and science. Sometimes referred to as the Princeps mathematicorum () and "the greatest mathematician since antiquity", Gauss had an exceptional influence in many fields of mathematics and science, and is ranked among history's most influential mathematicians.

There are several stories of his early genius. According to one, his gifts became very apparent at the age of three when he corrected, mentally and without fault in his calculations, an error his father had made on paper while calculating finances. Another story has it that in primary school after the young Gauss misbehaved, his teacher, J.G. Büttner, gave him a task: add a list of integers in arithmetic progression; as the story is most often told, these were the numbers from 1 to 100. The young Gauss reputedly produced the correct answer within seconds, to the astonishment of his teacher and his assistant Martin Bartels. Gauss's presumed method was to realize that pairwise addition of terms from opposite ends of the list yielded identical intermediate sums: 1 + 100 = 101, 2 + 99 = 101, 3 + 98 = 101, and so on, for a total sum of 50 × 101 = 5050. However, the details of the story are at best uncertain (see for discussion of the original Wolfgang Sartorius von Waltershausen source and the changes in other versions), and some authors, such as Joseph J. Rotman in his book A First Course in Abstract Algebra (2005), question whether it ever happened. He referred to mathematics as "the queen of sciences" and supposedly once espoused a belief in the necessity of immediately understanding Euler's identity as a benchmark pursuant to becoming a first-class mathematician.

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https://en.wikipedia.org/wiki/Cat

Cat

Taxonomy

The cat (Felis catus) is a domestic species of small carnivorous mammal. It is the only domesticated species in the family Felidae and is commonly referred to as the domestic cat or house cat to distinguish it from the wild members of the family. A cat can either be a house cat, a farm cat, or a feral cat; the latter ranges freely and avoids human contact. Domestic cats are valued by humans for companionship and their ability to kill rodents. About 60 cat breeds are recognized by various cat registries. The cat is similar in anatomy to the other felid species: it has a strong flexible body, quick reflexes, sharp teeth, and retractable claws adapted to killing small prey. Its night vision and sense of smell are well developed. Cat communication includes vocalizations like meowing, purring, trilling, hissing, growling, and grunting as well as cat-specific body language. A predator that is most active at dawn and dusk (crepuscular), the cat is a solitary hunter but a social species. It can hear sounds too faint or too high in frequency for human ears, such as those made by mice and other small mammals. Cats also secrete and perceive pheromones. Female domestic cats can have kittens from spring to late autumn, with litter sizes often ranging from two to five kittens. Domestic cats are bred and shown at events as registered pedigreed cats, a hobby known as cat fancy. Population control of cats may be effected by spaying and neutering, but their proliferation and the abandonment of pets has resulted in large numbers of feral cats worldwide, contributing to the extinction of entire bird, mammal, and reptile species. It was long thought that cat domestication began in ancient Egypt, where cats were venerated from around 3100 BC, but recent advances in archaeology and genetics have shown that their domestication occurred in Western Asia around 7500 BC. there were an estimated 220 million owned and 480 million stray cats in the world. the domestic cat was the second most popular pet in the United States, with 95.6 million cats owned and around 42 million households own at least one cat. In the United Kingdom, 26% of adults have a cat with an estimated population of 10.9 million pet cats

The scientific name Felis catus was proposed by Carl Linnaeus in 1758 for a domestic cat. Felis catus domesticus was proposed by Johann Christian Polycarp Erxleben in 1777. Felis daemon proposed by Konstantin Alekseevich Satunin in 1904 was a black cat from the Transcaucasus, later identified as a domestic cat. In 2003, the International Commission on Zoological Nomenclature ruled that the domestic cat is a distinct species, namely Felis catus. In 2007, it was considered a subspecies, F. silvestris catus, of the European wildcat (F. silvestris) following results of phylogenetic research. In 2017, the IUCN Cat Classification Taskforce followed the recommendation of the ICZN in regarding the domestic cat as a distinct species, Felis catus.

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https://en.wikipedia.org/wiki/Virus

Virus

Origins

A virus is a submicroscopic infectious agent that replicates only inside the living cells of an organism. Viruses infect all life forms, from animals and plants to microorganisms, including bacteria and archaea. Since Dmitri Ivanovsky's 1892 article describing a non-bacterial pathogen infecting tobacco plants and the discovery of the tobacco mosaic virus by Martinus Beijerinck in 1898, more than 9,000 virus species have been described in detail of the millions of types of viruses in the environment. Viruses are found in almost every ecosystem on Earth and are the most numerous type of biological entity. The study of viruses is known as virology, a subspeciality of microbiology. When infected, a host cell is often forced to rapidly produce thousands of copies of the original virus. When not inside an infected cell or in the process of infecting a cell, viruses exist in the form of independent particles, or virions, consisting of (i) the genetic material, i.e., long molecules of DNA or RNA that encode the structure of the proteins by which the virus acts; (ii) a protein coat, the capsid, which surrounds and protects the genetic material; and in some cases (iii) an outside envelope of lipids. The shapes of these virus particles range from simple helical and icosahedral forms to more complex structures. Most virus species have virions too small to be seen with an optical microscope and are one-hundredth the size of most bacteria. The origins of viruses in the evolutionary history of life are unclear: some may have evolved from plasmids—pieces of DNA that can move between cells—while others may have evolved from bacteria. In evolution, viruses are an important means of horizontal gene transfer, which increases genetic diversity in a way analogous to sexual reproduction. Viruses are considered by some biologists to be a life form, because they carry genetic material, reproduce, and evolve through natural selection, although they lack the key characteristics, such as cell structure, that are generally considered necessary criteria for defining life. Because they possess some but not all such qualities, viruses have been described as "organisms at the edge of life", and as replicators. Viruses spread in many ways. One transmission pathway is through disease-bearing organisms known as vectors: for example, viruses are often transmitted from plant to plant by insects that feed on plant sap, such as aphids; and viruses in animals can be carried by blood-sucking insects. Many viruses, including influenza viruses, SARS-CoV-2, chickenpox, smallpox, and measles, spread in the air by coughing and sneezing. Norovirus and rotavirus, common causes of viral gastroenteritis, are transmitted by the faecal–oral route, passed by hand-to-mouth contact or in food or water. The infectious dose of norovirus required to produce infection in humans is fewer than 100 particles. HIV is one of several viruses transmitted through sexual contact and by exposure to infected blood. The variety of host cells that a virus can infect is called its "host range". This can be narrow, meaning a virus is capable of infecting few species, or broad, meaning it is capable of infecting many. Viral infections in animals provoke an immune response that usually eliminates the infecting virus. Immune responses can also be produced by vaccines, which confer an artificially acquired immunity to the specific viral infection. Some viruses, including those that cause HIV/AIDS, HPV infection, and viral hepatitis, evade these immune responses and result in chronic infections. Several classes of antiviral drugs have been developed.

Viruses are found wherever there is life and have probably existed since living cells first evolved. The origin of viruses is unclear because they do not form fossils, so molecular techniques are used to investigate how they arose. In addition, viral genetic material occasionally integrates into the germline of the host organisms, by which they can be passed on vertically to the offspring of the host for many generations. This provides an invaluable source of information for paleovirologists to trace back ancient viruses that have existed up to millions of years ago. There are three main hypotheses that aim to explain the origins of viruses: Regressive hypothesis Viruses may have once been small cells that parasitised larger cells. Over time, genes not required by their parasitism were lost. The bacteria rickettsia and chlamydia are living cells that, like viruses, can reproduce only inside host cells. They lend support to this hypothesis, as their dependence on parasitism is likely to have caused the loss of genes that enabled them to survive outside a cell. This is also called the 'degeneracy hypothesis', or 'reduction hypothesis'. Cellular origin hypothesis Some viruses may have evolved from bits of DNA or RNA that "escaped" from the genes of a larger organism. The escaped DNA could have come from plasmids (pieces of naked DNA that can move between cells) or transposons (molecules of DNA that replicate and move around to different positions within the genes of the cell). Once called "jumping genes", transposons are examples of mobile genetic elements and could be the origin of some viruses. They were discovered in maize by Barbara McClintock in 1950. This is sometimes called the 'vagrancy hypothesis', or the 'escape hypothesis'. Co-evolution hypothesis This is also called the 'virus-first hypothesis' and proposes that viruses may have evolved from complex molecules of protein and nucleic acid at the same time that cells first appeared on Earth and would have been dependent on cellular life for billions of years. Viroids are molecules of RNA that are not classified as viruses because they lack a protein coat. They have characteristics that are common to several viruses and are often called subviral agents. Viroids are important pathogens of plants. They do not code for proteins but interact with the host cell and use the host machinery for their replication. The hepatitis delta virus of humans has an RNA genome similar to viroids but has a protein coat derived from hepatitis B virus and cannot produce one of its own. It is, therefore, a defective virus. Although hepatitis delta virus genome may replicate independently once inside a host cell, it requires the help of hepatitis B virus to provide a protein coat so that it can be transmitted to new cells. In similar manner, the sputnik virophage is dependent on mimivirus, which infects the protozoan Acanthamoeba castellanii. These viruses, which are dependent on the presence of other virus species in the host cell, are called 'satellites' and may represent evolutionary intermediates of viroids and viruses. In the past, there were problems with all of these hypotheses: the regressive hypothesis did not explain why even the smallest of cellular parasites do not resemble viruses in any way. The escape hypothesis did not explain the complex capsids and other structures on virus particles. The virus-first hypothesis contravened the definition of viruses in that they require host cells. Viruses are now recognised as ancient and as having origins that pre-date the divergence of life into the three domains. This discovery has led modern virologists to reconsider and re-evaluate these three classical hypotheses. The evidence for an ancestral world of RNA cells and computer analysis of viral and host DNA sequences are giving a better understanding of the evolutionary relationships between different viruses and may help identify the ancestors of modern viruses. To date, such analyses have not proved which of these hypotheses is correct. It seems unlikely that all currently known viruses have a common ancestor, and viruses have probably arisen numerous times in the past by one or more mechanisms.

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https://en.wikipedia.org/wiki/Archaea

Archaea

Morphology

Archaea ( ; singular archaeon ) constitute a domain of single-celled organisms. These microorganisms lack cell nuclei and are therefore prokaryotes. Archaea were initially classified as bacteria, receiving the name archaebacteria (in the Archaebacteria kingdom), but this term has fallen out of use. Archaeal cells have unique properties separating them from the other two domains, Bacteria and Eukaryota. Archaea are further divided into multiple recognized phyla. Classification is difficult because most have not been isolated in a laboratory and have been detected only by their gene sequences in environmental samples. Archaea and bacteria are generally similar in size and shape, although a few archaea have very different shapes, such as the flat, square cells of Haloquadratum walsbyi. Despite this morphological similarity to bacteria, archaea possess genes and several metabolic pathways that are more closely related to those of eukaryotes, notably for the enzymes involved in transcription and translation. Other aspects of archaeal biochemistry are unique, such as their reliance on ether lipids in their cell membranes, including archaeols. Archaea use more diverse energy sources than eukaryotes, ranging from organic compounds such as sugars, to ammonia, metal ions or even hydrogen gas. The salt-tolerant Haloarchaea use sunlight as an energy source, and other species of archaea fix carbon (autotrophy), but unlike plants and cyanobacteria, no known species of archaea does both. Archaea reproduce asexually by binary fission, fragmentation, or budding; unlike bacteria, no known species of Archaea form endospores. The first observed archaea were extremophiles, living in extreme environments such as hot springs and salt lakes with no other organisms. Improved molecular detection tools led to the discovery of archaea in almost every habitat, including soil, oceans, and marshlands. Archaea are particularly numerous in the oceans, and the archaea in plankton may be one of the most abundant groups of organisms on the planet. Archaea are a major part of Earth's life. They are part of the microbiota of all organisms. In the human microbiome, they are important in the gut, mouth, and on the skin. Their morphological, metabolic, and geographical diversity permits them to play multiple ecological roles: carbon fixation; nitrogen cycling; organic compound turnover; and maintaining microbial symbiotic and syntrophic communities, for example. No clear examples of archaeal pathogens or parasites are known. Instead they are often mutualists or commensals, such as the methanogens (methane-producing strains) that inhabit the gastrointestinal tract in humans and ruminants, where their vast numbers facilitate digestion. Methanogens are also used in biogas production and sewage treatment, and biotechnology exploits enzymes from extremophile archaea that can endure high temperatures and organic solvents.

Individual archaea range from 0.1 micrometers (μm) to over 15 μm in diameter, and occur in various shapes, commonly as spheres, rods, spirals or plates. Other morphologies in the Thermoproteota include irregularly shaped lobed cells in Sulfolobus, needle-like filaments that are less than half a micrometer in diameter in Thermofilum, and almost perfectly rectangular rods in Thermoproteus and Pyrobaculum. Archaea in the genus Haloquadratum such as Haloquadratum walsbyi are flat, square specimens that live in hypersaline pools. These unusual shapes are probably maintained by both their cell walls and a prokaryotic cytoskeleton. Proteins related to the cytoskeleton components of other organisms exist in archaea, and filaments form within their cells, but in contrast with other organisms, these cellular structures are poorly understood. In Thermoplasma and Ferroplasma the lack of a cell wall means that the cells have irregular shapes, and can resemble amoebae. Some species form aggregates or filaments of cells up to 200 μm long. These organisms can be prominent in biofilms. Notably, aggregates of Thermococcus coalescens cells fuse together in culture, forming single giant cells. Archaea in the genus Pyrodictium produce an elaborate multicell colony involving arrays of long, thin hollow tubes called cannulae that stick out from the cells' surfaces and connect them into a dense bush-like agglomeration. The function of these cannulae is not settled, but they may allow communication or nutrient exchange with neighbors. Multi-species colonies exist, such as the "string-of-pearls" community that was discovered in 2001 in a German swamp. Round whitish colonies of a novel Euryarchaeota species are spaced along thin filaments that can range up to long; these filaments are made of a particular bacteria species.

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https://en.wikipedia.org/wiki/Disease

Disease

Treatments

A disease is a particular abnormal condition that negatively affects the structure or function of all or part of an organism, and that is not immediately due to any external injury. Diseases are often known to be medical conditions that are associated with specific signs and symptoms. A disease may be caused by external factors such as pathogens or by internal dysfunctions. For example, internal dysfunctions of the immune system can produce a variety of different diseases, including various forms of immunodeficiency, hypersensitivity, allergies and autoimmune disorders. In humans, disease is often used more broadly to refer to any condition that causes pain, dysfunction, distress, social problems, or death to the person affected, or similar problems for those in contact with the person. In this broader sense, it sometimes includes injuries, disabilities, disorders, syndromes, infections, isolated symptoms, deviant behaviors, and atypical variations of structure and function, while in other contexts and for other purposes these may be considered distinguishable categories. Diseases can affect people not only physically, but also mentally, as contracting and living with a disease can alter the affected person's perspective on life. Death due to disease is called death by natural causes. There are four main types of disease: infectious diseases, deficiency diseases, hereditary diseases (including both genetic diseases and non-genetic hereditary diseases), and physiological diseases. Diseases can also be classified in other ways, such as communicable versus non-communicable diseases. The deadliest diseases in humans are coronary artery disease (blood flow obstruction), followed by cerebrovascular disease and lower respiratory infections. In developed countries, the diseases that cause the most sickness overall are neuropsychiatric conditions, such as depression and anxiety. The study of disease is called pathology, which includes the study of etiology, or cause.

Medical therapies or treatments are efforts to cure or improve a disease or other health problems. In the medical field, therapy is synonymous with the word treatment. Among psychologists, the term may refer specifically to psychotherapy or "talk therapy". Common treatments include medications, surgery, medical devices, and self-care. Treatments may be provided by an organized health care system, or informally, by the patient or family members. Preventive healthcare is a way to avoid an injury, sickness, or disease in the first place. A treatment or cure is applied after a medical problem has already started. A treatment attempts to improve or remove a problem, but treatments may not produce permanent cures, especially in chronic diseases. Cures are a subset of treatments that reverse diseases completely or end medical problems permanently. Many diseases that cannot be completely cured are still treatable. Pain management (also called pain medicine) is that branch of medicine employing an interdisciplinary approach to the relief of pain and improvement in the quality of life of those living with pain. Treatment for medical emergencies must be provided promptly, often through an emergency department or, in less critical situations, through an urgent care facility.

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https://en.wikipedia.org/wiki/Disease

Disease

Epidemiology

A disease is a particular abnormal condition that negatively affects the structure or function of all or part of an organism, and that is not immediately due to any external injury. Diseases are often known to be medical conditions that are associated with specific signs and symptoms. A disease may be caused by external factors such as pathogens or by internal dysfunctions. For example, internal dysfunctions of the immune system can produce a variety of different diseases, including various forms of immunodeficiency, hypersensitivity, allergies and autoimmune disorders. In humans, disease is often used more broadly to refer to any condition that causes pain, dysfunction, distress, social problems, or death to the person affected, or similar problems for those in contact with the person. In this broader sense, it sometimes includes injuries, disabilities, disorders, syndromes, infections, isolated symptoms, deviant behaviors, and atypical variations of structure and function, while in other contexts and for other purposes these may be considered distinguishable categories. Diseases can affect people not only physically, but also mentally, as contracting and living with a disease can alter the affected person's perspective on life. Death due to disease is called death by natural causes. There are four main types of disease: infectious diseases, deficiency diseases, hereditary diseases (including both genetic diseases and non-genetic hereditary diseases), and physiological diseases. Diseases can also be classified in other ways, such as communicable versus non-communicable diseases. The deadliest diseases in humans are coronary artery disease (blood flow obstruction), followed by cerebrovascular disease and lower respiratory infections. In developed countries, the diseases that cause the most sickness overall are neuropsychiatric conditions, such as depression and anxiety. The study of disease is called pathology, which includes the study of etiology, or cause.

Epidemiology is the study of the factors that cause or encourage diseases. Some diseases are more common in certain geographic areas, among people with certain genetic or socioeconomic characteristics, or at different times of the year. Epidemiology is considered a cornerstone methodology of public health research and is highly regarded in evidence-based medicine for identifying risk factors for diseases. In the study of communicable and non-communicable diseases, the work of epidemiologists ranges from outbreak investigation to study design, data collection, and analysis including the development of statistical models to test hypotheses and the documentation of results for submission to peer-reviewed journals. Epidemiologists also study the interaction of diseases in a population, a condition known as a syndemic. Epidemiologists rely on a number of other scientific disciplines such as biology (to better understand disease processes), biostatistics (the current raw information available), Geographic Information Science (to store data and map disease patterns) and social science disciplines (to better understand proximate and distal risk factors). Epidemiology can help identify causes as well as guide prevention efforts. In studying diseases, epidemiology faces the challenge of defining them. Especially for poorly understood diseases, different groups might use significantly different definitions. Without an agreed-on definition, different researchers may report different numbers of cases and characteristics of the disease. Some morbidity databases are compiled with data supplied by states and territories health authorities, at national levels or larger scale (such as European Hospital Morbidity Database (HMDB)) which may contain hospital discharge data by detailed diagnosis, age and sex. The European HMDB data was submitted by European countries to the World Health Organization Regional Office for Europe.

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https://en.wikipedia.org/wiki/Day

Day

Etymology

Generally, a day is roughly the time of one rotation of the Earth (about 24 hours) or one rotation of other large astronomical objects. In everyday life, the word "day" often refers to a solar day, which is the length between two solar noons or times the Sun reaches the highest point. The word "day" may also refer to daytime, a time period when the location receives direct and indirect sunlight. On Earth, as a location passes through its day, it experiences morning, noon, afternoon, evening, and night. The effect of a day is vital to many life processes, which is called the circadian rhythm. Days can be organized into calendars as dates, usually into months and years. Most calendars' arrangement of dates use either or both the Sun's (solar calendar) or the Moon's (lunar calendar) relative position in the sky. The start of a day is commonly accepted as roughly the time of the middle of the night or midnight, written as 0:00 or 12 am in 24- or 12-hour clock. Because the time of midnight varies between locations, time zones are set up to facilitate the use of a uniform standard time. In specific applications, the definition of a day are slightly modified, such as in the SI day (exactly 86,400 seconds) used for computers and standards keeping, local mean time accounting of the Earth's natural fluctuation of a solar day, and stellar day and sidereal day (using the celestial sphere) used for astronomy. In some countries, a day may be set starting earlier or later via the daylight saving time, making it possible to have a 23- or 25-hour civil day.

The term comes from the Old English dæg, with its cognates such as dagur in Icelandic, Tag in German, and dag in Norwegian, Danish, Swedish and Dutch – all stemming from a Proto-Germanic root *dagaz. , day is the 205th most common word in US English, and the 210th most common in UK English.

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https://en.wikipedia.org/wiki/Dictatorship

Dictatorship

Structure

A dictatorship is a form of government which is characterized by a leader or a group of leaders which holds governmental powers with few to no limitations on them. The leader of a dictatorship is called a dictator. Politics in a dictatorship take place between the dictator, the inner circle, and the opposition, which may be peaceful or violent. Dictatorships can be formed by a military coup that overthrows the previous government through force or by a self-coup in which elected leaders make their rule permanent. Dictatorships are authoritarian or totalitarian and can be classified as military dictatorships, one-party dictatorships, personalist dictatorships, or absolute monarchies. The term dictatorship originates from its use in the Roman Republic. Early military dictatorships developed in the post-classical era, particularly in Shogun-era Japan. Modern dictatorships developed in the 19th century as caudillos seized power in Latin America. Fascist states and Communist states emerged in Europe in the 1920s and 1930s. Fascism was eradicated in the aftermath of World War II, while Communism spread to other continents. Personalist dictatorships in Africa and military dictatorships in Latin America became prominent in the 1960s and 1970s. Many dictatorships fell during the end of the Cold War and the third wave of democratisation. Many dictatorships still exist, particularly in Africa and Asia. Dictatorships frequently hold elections in order to establish their legitimacy or provide incentives to members of the ruling party, but these elections are not competitive for the opposition. Stability in a dictatorship is maintained through coercion, which involves the restriction of access to information, the tracking of the political opposition, and acts of violence. Strong opposition groups can result in the collapse of a dictatorship through a coup or a revolution.

The leader of a dictatorship is called a dictator. The power structures of dictatorships vary, and different definitions of dictatorship consider different elements of this structure. Political scientists such as Juan José Linz and Samuel P. Huntington identify key attributes that define the power structure of a dictatorship, including a single leader or a small group of leaders, the exercise of power with few limitations, limited political pluralism, and limited mass mobilization. Dictatorship may also be defined as a lack of democracy. The dictator exercises broad power over the government and society, but other individuals are necessary to carry out the dictator's rule. These individuals form an inner circle, making up a class of elites that hold a degree of power within the dictatorship and receive benefits in exchange for their support. They may be military officers, party members, or friends and family of the dictator. Elites are also the primary political threats of a dictator, as they can leverage their power to influence or overthrow the dictatorship. The inner circle's support is necessary for a dictator's orders to be carried out, causing elites to serve as a check on the dictator's power. To enact policy, a dictator must either appease the regime's elites or attempt to replace them. Elites must also compete to wield more power than one another, but the amount of power held by elites also depends on their unity. Factions or divisions among the elites will mitigate their ability to bargain with the dictator, resulting in the dictator having more unrestrained power. A unified inner circle has the capacity to overthrow a dictator, and the dictator must make greater concessions to the inner circle to stay in power. This is particularly true when the inner circle is made up of military officers that have the resources to carry out a military coup. The opposition to a dictatorship represents all of the factions that are not part of the dictatorship and anyone that does not support the regime. Organized opposition is a threat to the stability of a dictatorship, as it seeks to undermine public support for the dictator and calls for regime change. A dictator may address the opposition by repressing it through force, modifying laws to restrict its power, or appeasing it with limited benefits. The opposition can be an external group, or it can also include current and former members of the dictator's inner circle.

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https://en.wikipedia.org/wiki/Allergy

Allergy

Cause

Allergies, also known as allergic diseases, are a number of conditions caused by hypersensitivity of the immune system to typically harmless substances in the environment. These diseases include hay fever, food allergies, atopic dermatitis, allergic asthma, and anaphylaxis. Symptoms may include red eyes, an itchy rash, sneezing, coughing, a runny nose, shortness of breath, or swelling. Food intolerances and food poisoning are separate conditions. Common allergens include pollen and certain foods. Metals and other substances may also cause such problems. Food, insect stings, and medications are common causes of severe reactions. Their development is due to both genetic and environmental factors. The underlying mechanism involves immunoglobulin E antibodies (IgE), part of the body's immune system, binding to an allergen and then to a receptor on mast cells or basophils where it triggers the release of inflammatory chemicals such as histamine. Diagnosis is typically based on a person's medical history. Further testing of the skin or blood may be useful in certain cases. Positive tests, however, may not necessarily mean there is a significant allergy to the substance in question. Early exposure to potential allergens may be protective. Treatments for allergies include avoidance of known allergens and the use of medications such as steroids and antihistamines. In severe reactions, injectable adrenalin (epinephrine) is recommended. Allergen immunotherapy, which gradually exposes people to larger and larger amounts of allergen, is useful for some types of allergies such as hay fever and reactions to insect bites. Its use in food allergies is unclear. Allergies are common. In the developed world, about 20% of people are affected by allergic rhinitis, about 6% of people have at least one food allergy, and about 20% have or have had atopic dermatitis at some point in time. Depending on the country, about 1–18% of people have asthma. Anaphylaxis occurs in between 0.05–2% of people. Rates of many allergic diseases appear to be increasing. The word "allergy" was first used by Clemens von Pirquet in 1906.

Risk factors for allergies can be placed in two broad categories, namely host and environmental factors. Host factors include heredity, sex, race, and age, with heredity being by far the most significant. However, there have been recent increases in the incidence of allergic disorders that cannot be explained by genetic factors alone. Four major environmental candidates are alterations in exposure to infectious diseases during early childhood, environmental pollution, allergen levels, and dietary changes.

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https://en.wikipedia.org/wiki/Engineering

Engineering

Definition

Engineering is the use of scientific principles to design and build machines, structures, and other items, including bridges, tunnels, roads, vehicles, and buildings. The discipline of engineering encompasses a broad range of more specialized fields of engineering, each with a more specific emphasis on particular areas of applied mathematics, applied science, and types of application. See glossary of engineering. The term engineering is derived from the Latin ingenium, meaning "cleverness" and ingeniare, meaning "to contrive, devise".

The American Engineers' Council for Professional Development (ECPD, the predecessor of ABET) has defined "engineering" as: The creative application of scientific principles to design or develop structures, machines, apparatus, or manufacturing processes, or works utilizing them singly or in combination; or to construct or operate the same with full cognizance of their design; or to forecast their behavior under specific operating conditions; all as respects an intended function, economics of operation and safety to life and property. (Includes Britannica article on Engineering)

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https://en.wikipedia.org/wiki/Education

Education

Types

Education is a purposeful activity directed at achieving certain aims, such as transmitting knowledge or fostering skills and character traits. These aims may include the development of understanding, rationality, kindness, and honesty. Various researchers emphasize the role of critical thinking in order to distinguish education from indoctrination. Some theorists require that education results in an improvement of the student while others prefer a value-neutral definition of the term. In a slightly different sense, education may also refer, not to the process, but to the product of this process: the mental states and dispositions possessed by educated people. Education originated as the transmission of cultural heritage from one generation to the next. Today, educational goals increasingly encompass new ideas such as the liberation of learners, skills needed for modern society, empathy, and complex vocational skills. Types of education are commonly divided into formal, non-formal, and informal education. Formal education takes place in education and training institutions, is usually structured by curricular aims and objectives, and learning is typically guided by a teacher. In most regions, formal education is compulsory up to a certain age and commonly divided into educational stages such as kindergarten, primary school and secondary school. Nonformal education occurs as addition or alternative to formal education. It may be structured according to educational arrangements, but in a more flexible manner, and usually takes place in community-based, workplace-based or civil society-based settings. Lastly, informal education occurs in daily life, in the family, any experience that has a formative effect on the way one thinks, feels, or acts may be considered educational, whether unintentional or intentional. In practice there is a continuum from the highly formalized to the highly informalized, and informal learning can occur in all three settings. For instance, homeschooling can be classified as nonformal or informal, depending upon the structure. Regardless of setting, educational methods include teaching, training, storytelling, discussion, and directed research. The methodology of teaching is called pedagogy. Education is supported by a variety of different philosophies, theories and empirical research agendas. There are movements for education reforms, such as for improving quality and efficiency of education towards relevance in students' lives and efficient problem solving in modern or future society at large, or for evidence-based education methodologies. A right to education has been recognized by some governments and the United Nations. Global initiatives aim at achieving the Sustainable Development Goal 4, which promotes quality education for all.

There are various ways how forms of education are commonly subdivided into different types. The most common subdivision is between formal, non-formal, and informal education. However, some theorists only distinguish between formal and informal education. A process of teaching constitutes formal education if it happens in a complex institutionalized framework. Such frameworks are usually chronologically and hierarchically organized as in modern schooling systems, which have different classes based on the student's age and progress, all the way from primary school to university. Because of its scale, formal education is usually controlled and guided by a governmental entity and is normally compulsory up to a certain age. Non-formal and informal education differ from formal education due to their lack of such a governmental institutionalized framework. Non-formal education constitutes a middle ground in the sense that it is also organized, systematic, and carried out with a clear purpose in mind, such as tutoring, fitness classes, or the scouting movement. Informal education, on the other hand, happens in an unsystematic way through daily experiences and exposure to the environment. Unlike formal and non-formal education, there is usually no designated authority figure responsible for teaching. Informal education is present in many different settings and happens throughout one's life, mostly in a spontaneous manner. This is how children usually learn their mother tongue from their parents or when learning how to prepare a certain dish by cooking together. Some accounts tie the difference between the three types mainly to the location where the learning takes place: in school for formal education, in places of the individual's day-to-day routine for informal education, and in other places occasionally visited for non-formal education. It has been argued that the motivation responsible for formal education is predominantly extrinsic, whereas it tends to be mainly intrinsic for non-formal and informal education. The distinction between the three types is normally clear for the paradigmatic cases but there are various intermediate forms of education that do not easily fall into one category. Formal education plays a central role in modern civilization. But in primitive cultures, most of the education happens not on the formal but on the informal level. This usually means that there is no distinction between activities focused on education and other activities. Instead, the whole environment may be seen as a form of school and many or all adults may act as teachers. An important reason for moving to formal forms of education is due to the sheer quantity of knowledge to be passed on, which requires both a formal setting and well-trained teachers to be transmitted effectively. A side effect of the process of formalization is that the educational experience becomes more abstract and more removed from daily life. In this regard, more emphasis is put on grasping general patterns instead of observing and imitating particular behavior. Closely related to the distinction between formal and informal education is that between conscious education, which is done with a clear purpose in mind, and unconscious education, which occurs on its own without being consciously planned or guided. This may happen in part through the personality of teachers and adults by having indirect effects on the development of the student's personality. Another categorization depends on the age group of the learners and includes childhood education, adolescent education, adult education, and elderly education. The distinction can also be based on the subject, encompassing fields like science education, language education, art education, religious education, and physical education. The educational methodology may be used as well for classifications, such as the difference between the traditional teacher-centered education, in which the teacher takes the center stage in providing students with information, in contrast to student-centered education, in which students take on a more active and responsible role in shaping the classroom activities. The term "alternative education" is sometimes used for a wide range of educational methods and approaches outside mainstream pedagogy, for example, like the emphasis on narration and storytelling found in indigenous education or autodidacticism. Forms of education can also be categorized by the medium used, for example, as distance education, like online education, e-learning, or m-learning, in contrast to regular classroom or onsite education. Various types of online education take the form of open education, where the courses and materials are made available with a minimal amount of barriers. Another classification is based on the social institution responsible for education and may include categories for institutions like family, school, civil society, state, and church. When the term education is used in the sense of an achievement or a product, expressions like type or level of education refer to the person's academic or professional qualification, such as high school completion, bachelor's degree, master's degree, doctor's degree, or degrees in vocational training.

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https://en.wikipedia.org/wiki/Obesity

Obesity

Management

Obesity is a medical condition, sometimes considered a disease, in which abnormal or excess body fat has accumulated to such an extent that it may have a negative effect on health. People are classified as obese when their body mass index (BMI)—a measurement obtained by dividing a person's weight by the square of the person's height (despite known allometric inaccuracies)—is over ; the range is defined as overweight. Some East Asian countries use lower values to calculate obesity. Obesity is a major cause of disability and is correlated with various diseases and conditions, particularly cardiovascular diseases, type 2 diabetes, obstructive sleep apnea, certain types of cancer, and osteoarthritis. High BMI is a marker of risk for, but not a direct cause of, diseases caused by diet and physical activity. A reciprocal link has been found between obesity and depression, with obesity increasing the risk of clinical depression, and also depression leading to a higher chance of developing obesity. Obesity has individual, socioeconomic, and environmental causes. Some of the known causes are diet, physical activity, automation, urbanization, genetic susceptibility, medications, mental disorders, economic policies, endocrine disorders, and exposure to endocrine-disrupting chemicals. Epidemiologic studies of overweight and obesity in children and adults covering 195 countries have shown that the prevalence of obesity has steadily increased in most countries, doubling in 73 countries between the years 1980 and 2015. As of 2015, the United States and China had the largest numbers of obese adults, and China and India had the largest numbers of obese children. By 2018, 42% of Americans were obese. While a majority of obese individuals at any given time are attempting to lose weight and are often successful, research shows that maintaining that weight loss over the long term proves to be rare. The reasons for weight cycling are not fully understood but may include decreased energy expenditure combined with an increased biological urge to eat during and after caloric restriction. More studies are needed to determine if weight cycling and yo-yo dieting contribute to inflammation and disease risk in obese individuals. Although there is no effective, well-defined, evidence-based intervention for preventing obesity, obesity prevention will require a complex approach, including interventions at community, family, and individual levels. Changes to diet and exercising are the main treatments recommended by health professionals. Diet quality can be improved by reducing the consumption of energy-dense foods, such as those high in fat or sugars, and by increasing the intake of dietary fiber. However, large-scale analyses have found an inverse relationship between energy density and energy cost of foods in developed nations. Medications can be used, along with a suitable diet, to reduce appetite or decrease fat absorption. If diet, exercise, and medication are not effective, a gastric balloon or surgery may be performed to reduce stomach volume or length of the intestines, leading to feeling full earlier, or a reduced ability to absorb nutrients from food. Obesity is a leading preventable cause of death worldwide, with increasing rates in adults and children. In 2015, 600 million adults (12%) and 100 million children were obese in 195 countries. Obesity is more common in women than in men. Public health officials view it as one of the most serious public health problems of the 21st century. Today, obesity is stigmatized in most of the world. Conversely, some cultures, past and present, have a favorable view of obesity, seeing it as a symbol of wealth and fertility. Nevertheless, in 2013, several medical societies, including the American Medical Association and the American Heart Association, classified obesity as a disease.

The main treatment for obesity consists of weight loss via lifestyle interventions, including prescribed diets and physical exercise. Although it is unclear what diets might support long-term weight loss, and although the effectiveness of low-calorie diets is debated, lifestyle changes that reduce calorie consumption or increase physical exercise over the long term also tend to produce some sustained weight loss, despite slow weight regain over time. Although 87% of participants in the National Weight Control Registry were able to maintain 10% body weight loss for 10 years, the most appropriate dietary approach for long term weight loss maintenance is still unknown. In the US, intensive behavioral interventions combining both dietary changes and exercise are recommended. Intermittent fasting has no additional benefit of weight loss compared to continuous energy restriction. Adherence is a more important factor in weight loss success than whatever kind of diet an individual undertakes. Several hypo-caloric diets are effective. In the short-term low carbohydrate diets appear better than low fat diets for weight loss. In the long term, however, all types of low-carbohydrate and low-fat diets appear equally beneficial. A 2014 review found that the heart disease and diabetes risks associated with different diets appear to be similar. Promotion of the Mediterranean diets among the obese may lower the risk of heart disease. Decreased intake of sweet drinks is also related to weight-loss. Success rates of long-term weight loss maintenance with lifestyle changes are low, ranging from 2–20%. Dietary and lifestyle changes are effective in limiting excessive weight gain in pregnancy and improve outcomes for both the mother and the child. Intensive behavioral counseling is recommended in those who are both obese and have other risk factors for heart disease.

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https://en.wikipedia.org/wiki/Musical%20instrument

Musical instrument

Classification

A musical instrument is a device created or adapted to make musical sounds. In principle, any object that produces sound can be considered a musical instrument—it is through purpose that the object becomes a musical instrument. A person who plays a musical instrument is known as an instrumentalist. The history of musical instruments dates to the beginnings of human culture. Early musical instruments may have been used for rituals, such as a horn to signal success on the hunt, or a drum in a religious ceremony. Cultures eventually developed composition and performance of melodies for entertainment. Musical instruments evolved in step with changing applications and technologies. The date and origin of the first device considered a musical instrument is disputed. The oldest object that some scholars refer to as a musical instrument, a simple flute, dates back as far as 50,000 - 60,000 years. Some consensus dates early flutes to about 40,000 years ago. However, most historians believe that determining a specific time of musical instrument invention is impossible, as many early musical instruments were made from animal skins, bone, wood, and other non-durable materials. Musical instruments developed independently in many populated regions of the world. However, contact among civilizations caused rapid spread and adaptation of most instruments in places far from their origin. By the post-classical era, instruments from Mesopotamia were in maritime Southeast Asia, and Europeans played instruments originating from North Africa. Development in the Americas occurred at a slower pace, but cultures of North, Central, and South America shared musical instruments. By 1400, musical instrument development slowed in many areas and was dominated by the Occident. During the Classical and Romantic periods of music, lasting from roughly 1750 to 1900, many new musical instruments were developed. While the evolution of traditional musical instruments slowed beginning in the 20th century, the proliferation of electricity led to the invention of new electric instruments, such as electric guitars, synthesizers and the theremin. Musical instrument classification is a discipline in its own right, and many systems of classification have been used over the years. Instruments can be classified by their effective range, material composition, size, role, etc. However, the most common academic method, Hornbostel–Sachs, uses the means by which they produce sound. The academic study of musical instruments is called organology.

There are many different methods of classifying musical instruments. Various methods examine aspects such as the physical properties of the instrument (material, color, shape, etc.), the use for the instrument, the means by which music is produced with the instrument, the range of the instrument, and the instrument's place in an orchestra or other ensemble. Most methods are specific to a geographic area or cultural group and were developed to serve the unique classification requirements of the group. The problem with these specialized classification schemes is that they tend to break down once they are applied outside of their original area. For example, a system based on instrument use would fail if a culture invented a new use for the same instrument. Scholars recognize Hornbostel–Sachs as the only system that applies to any culture and, more importantly, provides the only possible classification for each instrument. The most common classifications are strings, brass, woodwind, and percussion.

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https://en.wikipedia.org/wiki/Robotics

Robotics

Etymology

Robotics is an interdisciplinary branch of computer science and engineering. Robotics involves design, construction, operation, and use of robots. The goal of robotics is to design machines that can help and assist humans. Robotics integrates fields of mechanical engineering, electrical engineering, information engineering, mechatronics, electronics, bioengineering, computer engineering, control engineering, software engineering, mathematics, etc. Robotics develops machines that can substitute for humans and replicate human actions. Robots can be used in many situations for many purposes, but today many are used in dangerous environments (including inspection of radioactive materials, bomb detection and deactivation), manufacturing processes, or where humans cannot survive (e.g. in space, underwater, in high heat, and clean up and containment of hazardous materials and radiation). Robots can take any form, but some are made to resemble humans in appearance. This is claimed to help in the acceptance of robots in certain replicative behaviors which are usually performed by people. Such robots attempt to replicate walking, lifting, speech, cognition, or any other human activity. Many of today's robots are inspired by nature, contributing to the field of bio-inspired robotics. Certain robots require user input to operate while other robots function autonomously. The concept of creating robots that can operate autonomously dates back to classical times, but research into the functionality and potential uses of robots did not grow substantially until the 20th century. Throughout history, it has been frequently assumed by various scholars, inventors, engineers, and technicians that robots will one day be able to mimic human behavior and manage tasks in a human-like fashion. Today, robotics is a rapidly growing field, as technological advances continue; researching, designing, and building new robots serve various practical purposes, whether domestically, commercially, or militarily. Many robots are built to do jobs that are hazardous to people, such as defusing bombs, finding survivors in unstable ruins, and exploring mines and shipwrecks. Robotics is also used in STEM (science, technology, engineering, and mathematics) as a teaching aid.

The word robotics was derived from the word robot, which was introduced to the public by Czech writer Karel Čapek in his play R.U.R. (Rossum's Universal Robots), which was published in 1920. The word robot comes from the Slavic word robota, which means work/job. The play begins in a factory that makes artificial people called robots, creatures who can be mistaken for humans – very similar to the modern ideas of androids. Karel Čapek himself did not coin the word. He wrote a short letter in reference to an etymology in the Oxford English Dictionary in which he named his brother Josef Čapek as its actual originator. According to the Oxford English Dictionary, the word robotics was first used in print by Isaac Asimov, in his science fiction short story "Liar!", published in May 1941 in Astounding Science Fiction. Asimov was unaware that he was coining the term; since the science and technology of electrical devices is electronics, he assumed robotics already referred to the science and technology of robots. In some of Asimov's other works, he states that the first use of the word robotics was in his short story Runaround (Astounding Science Fiction, March 1942), where he introduced his concept of The Three Laws of Robotics. However, the original publication of "Liar!" predates that of "Runaround" by ten months, so the former is generally cited as the word's origin.

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https://en.wikipedia.org/wiki/Emotion

Emotion

Definitions

Emotions are mental states brought on by neurophysiological changes, variously associated with thoughts, feelings, behavioural responses, and a degree of pleasure or displeasure. There is currently no scientific consensus on a definition. Emotions are often intertwined with mood, temperament, personality, disposition, or creativity. Research on emotion has increased over the past two decades with many fields contributing including psychology, medicine, history, sociology of emotions, and computer science. The numerous theories that attempt to explain the origin, function and other aspects of emotions have fostered more intense research on this topic. Current areas of research in the concept of emotion include the development of materials that stimulate and elicit emotion. In addition, PET scans and fMRI scans help study the affective picture processes in the brain. From a mechanistic perspective, emotions can be defined as "a positive or negative experience that is associated with a particular pattern of physiological activity." Emotions produce different physiological, behavioral and cognitive changes. The original role of emotions was to motivate adaptive behaviors that in the past would have contributed to the passing on of genes through survival, reproduction, and kin selection. In some theories, cognition is an important aspect of emotion. Other theories, however, claim that emotion is separate from and can precede cognition. Consciously experiencing an emotion is exhibiting a mental representation of that emotion from a past or hypothetical experience, which is linked back to a content state of pleasure or displeasure. The content states are established by verbal explanations of experiences, describing an internal state. Emotions are complex. There are various theories on the question of whether or not emotions cause changes in our behaviour. On the one hand, the physiology of emotion is closely linked to arousal of the nervous system. Emotion is also linked to behavioral tendency. Extroverted people are more likely to be social and express their emotions, while introverted people are more likely to be more socially withdrawn and conceal their emotions. Emotion is often the driving force behind motivation. On the other hand, emotions are not causal forces but simply syndromes of components, which might include motivation, feeling, behaviour, and physiological changes, but none of these components is the emotion. Nor is the emotion an entity that causes these components. Emotions involve different components, such as subjective experience, cognitive processes, expressive behavior, psychophysiological changes, and instrumental behavior. At one time, academics attempted to identify the emotion with one of the components: William James with a subjective experience, behaviorists with instrumental behavior, psychophysiologists with physiological changes, and so on. More recently, emotion is said to consist of all the components. The different components of emotion are categorized somewhat differently depending on the academic discipline. In psychology and philosophy, emotion typically includes a subjective, conscious experience characterized primarily by psychophysiological expressions, biological reactions, and mental states. A similar multi-componential description of emotion is found in sociology. For example, Peggy Thoits described emotions as involving physiological components, cultural or emotional labels (anger, surprise, etc.), expressive body actions, and the appraisal of situations and contexts.

The Lexico definition of emotion is "A strong feeling deriving from one's circumstances, mood, or relationships with others." Emotions are responses to significant internal and external events. Emotions can be occurrences (e.g., panic) or dispositions (e.g., hostility), and short-lived (e.g., anger) or long-lived (e.g., grief). Psychotherapist Michael C. Graham describes all emotions as existing on a continuum of intensity. Thus fear might range from mild concern to terror or shame might range from simple embarrassment to toxic shame. Emotions have been described as consisting of a coordinated set of responses, which may include verbal, physiological, behavioral, and neural mechanisms. Emotions have been categorized, with some relationships existing between emotions and some direct opposites existing. Graham differentiates emotions as functional or dysfunctional and argues all functional emotions have benefits. In some uses of the word, emotions are intense feelings that are directed at someone or something. On the other hand, emotion can be used to refer to states that are mild (as in annoyed or content) and to states that are not directed at anything (as in anxiety and depression). One line of research looks at the meaning of the word emotion in everyday language and finds that this usage is rather different from that in academic discourse. In practical terms, Joseph LeDoux has defined emotions as the result of a cognitive and conscious process which occurs in response to a body system response to a trigger.

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https://en.wikipedia.org/wiki/Mars

Mars

Historical observations

Mars is the fourth planet from the Sun and the second-smallest planet in the Solar System, being larger than only Mercury. In the English language, Mars is named for the Roman god of war. Mars is a terrestrial planet with a thin atmosphere (less than 1% that of Earth's), and has a crust primarily composed of elements similar to Earth's crust, as well as a core made of iron and nickel. Mars has surface features such as impact craters, valleys, dunes, and polar ice caps. It has two small and irregularly shaped moons: Phobos and Deimos. Some of the most notable surface features on Mars include Olympus Mons, the largest volcano and highest known mountain on any planet in the Solar System, and Valles Marineris, one of the largest canyons in the Solar System. The Borealis basin in the Northern Hemisphere covers approximately 40% of the planet and may be a large impact feature. Days and seasons on Mars are comparable to those of Earth, as the planets have a similar rotation period and tilt of the rotational axis relative to the ecliptic plane. Liquid water on the surface of Mars cannot exist due to low atmospheric pressure, which is less than 1% of the atmospheric pressure on Earth. Both of Mars's polar ice caps appear to be made largely of water. In the distant past, Mars was likely wetter, and thus possibly more suited for life. However, it is unknown whether life has ever existed on Mars. Mars has been explored by several uncrewed spacecraft, beginning with Mariner 4 in 1965. NASA's Viking 1 lander transmitted in 1976 the first images from the Martian surface. Two countries have successfully deployed rovers on Mars, the United States first doing so with Sojourner in 1997 and China with Zhurong in 2021. There are also planned future missions to Mars, such as a Mars sample-return mission set to happen in 2026, and the Rosalind Franklin rover mission, which was intended to launch in 2018 but was delayed to 2024 at the earliest, with a more likely launch date at 2028. Mars can be viewed from Earth with the naked eye, as can its reddish coloring. This appearance, due to the iron oxide prevalent on its surface, has led to Mars often being called the Red Planet. It is among the brightest objects in Earth's sky, with an apparent magnitude that reaches −2.94, comparable to that of Jupiter and surpassed only by Venus, the Moon and the Sun. Historically, Mars has been observed since ancient times, and over the millennia, has been featured in culture and the arts in ways that have reflected humanity's growing knowledge of it.

The history of observations of Mars is marked by the oppositions of Mars when the planet is closest to Earth and hence is most easily visible, which occur every couple of years. Even more notable are the perihelic oppositions of Mars, which are distinguished because Mars is close to perihelion, making it even closer to Earth.

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https://en.wikipedia.org/wiki/French%20language

French language

Grammar

French ( or ) is a Romance language of the Indo-European family. It descended from the Vulgar Latin of the Roman Empire, as did all Romance languages. French evolved from Gallo-Romance, the Latin spoken in Gaul, and more specifically in Northern Gaul. Its closest relatives are the other langues d'oïl—languages historically spoken in northern France and in southern Belgium, which French (Francien) largely supplanted. French was also influenced by native Celtic languages of Northern Roman Gaul like Gallia Belgica and by the (Germanic) Frankish language of the post-Roman Frankish invaders. Today, owing to France's past overseas expansion, there are numerous French-based creole languages, most notably Haitian Creole. A French-speaking person or nation may be referred to as Francophone in both English and French. French is an official language in 29 countries across multiple continents, most of which are members of the Organisation internationale de la Francophonie (OIF), the community of 84 countries which share the official use or teaching of French. French is also one of six official languages used in the United Nations. It is spoken as a first language (in descending order of the number of speakers) in France; Canada (especially in the provinces of Quebec, Ontario, and New Brunswick, as well as other Francophone regions); Belgium (Wallonia and the Brussels-Capital Region); western Switzerland (specifically the cantons forming the Romandy region); parts of Luxembourg; parts of the United States (the states of Louisiana, Maine, New Hampshire and Vermont); Monaco; the Aosta Valley region of Italy; and various communities elsewhere. In 2015, approximately 40% of the francophone population (including L2 and partial speakers) lived in Europe, 36% in sub-Saharan Africa and the Indian Ocean, 15% in North Africa and the Middle East, 8% in the Americas, and 1% in Asia and Oceania. French is the second most widely spoken mother tongue in the European Union. Of Europeans who speak other languages natively, approximately one-fifth are able to speak French as a second language. French is the second most taught foreign language in the EU. All institutions of the EU use French as a working language along with English and German; in certain institutions, French is the sole working language (e.g. at the Court of Justice of the European Union). French is also the 18th most natively spoken language in the world, fifth most spoken language by total number of speakers and the second or third most studied language worldwide (with about 120 million learners as of 2017). As a result of French and Belgian colonialism from the 16th century onward, French was introduced to new territories in the Americas, Africa and Asia. Most second-language speakers reside in Francophone Africa, in particular Gabon, Algeria, Morocco, Tunisia, Mauritius, Senegal and Ivory Coast. French is estimated to have about 76 million native speakers; about 235 million daily, fluent speakers; and another 77–110 million secondary speakers who speak it as a second language to varying degrees of proficiency, mainly in Africa. According to the OIF, approximately 321 million people worldwide are "able to speak the language", without specifying the criteria for this estimation or whom it encompasses. According to a demographic projection led by the Université Laval and the Réseau Démographie de l'Agence universitaire de la Francophonie, the total number of French speakers will reach approximately 500 million in 2025 and 650 million by 2050. OIF estimates 700 million by 2050, 80% of whom will be in Africa. French has a long history as an international language of literature and scientific standards and is a primary or second language of many international organisations including the United Nations, the European Union, the North Atlantic Treaty Organization, the World Trade Organization, the International Olympic Committee, and the International Committee of the Red Cross. In 2011, Bloomberg Businessweek ranked French the third most useful language for business, after English and Standard Mandarin Chinese.

French is a moderately inflected language. Nouns and most pronouns are inflected for number (singular or plural, though in most nouns the plural is pronounced the same as the singular even if spelled differently); adjectives, for number and gender (masculine or feminine) of their nouns; personal pronouns and a few other pronouns, for person, number, gender, and case; and verbs, for tense, aspect, mood, and the person and number of their subjects. Case is primarily marked using word order and prepositions, while certain verb features are marked using auxiliary verbs. According to the French lexicogrammatical system, French has a rank-scale hierarchy with clause as the top rank, which is followed by group rank, word rank, and morpheme rank. A French clause is made up of groups, groups are made up of words, and lastly, words are made up of morphemes. French grammar shares several notable features with most other Romance languages, including the loss of Latin declensions the loss of the neuter gender the development of grammatical articles from Latin demonstratives the loss of certain Latin tenses and the creation of new tenses from auxiliaries.

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https://en.wikipedia.org/wiki/French%20language

French language

Vocabulary

French ( or ) is a Romance language of the Indo-European family. It descended from the Vulgar Latin of the Roman Empire, as did all Romance languages. French evolved from Gallo-Romance, the Latin spoken in Gaul, and more specifically in Northern Gaul. Its closest relatives are the other langues d'oïl—languages historically spoken in northern France and in southern Belgium, which French (Francien) largely supplanted. French was also influenced by native Celtic languages of Northern Roman Gaul like Gallia Belgica and by the (Germanic) Frankish language of the post-Roman Frankish invaders. Today, owing to France's past overseas expansion, there are numerous French-based creole languages, most notably Haitian Creole. A French-speaking person or nation may be referred to as Francophone in both English and French. French is an official language in 29 countries across multiple continents, most of which are members of the Organisation internationale de la Francophonie (OIF), the community of 84 countries which share the official use or teaching of French. French is also one of six official languages used in the United Nations. It is spoken as a first language (in descending order of the number of speakers) in France; Canada (especially in the provinces of Quebec, Ontario, and New Brunswick, as well as other Francophone regions); Belgium (Wallonia and the Brussels-Capital Region); western Switzerland (specifically the cantons forming the Romandy region); parts of Luxembourg; parts of the United States (the states of Louisiana, Maine, New Hampshire and Vermont); Monaco; the Aosta Valley region of Italy; and various communities elsewhere. In 2015, approximately 40% of the francophone population (including L2 and partial speakers) lived in Europe, 36% in sub-Saharan Africa and the Indian Ocean, 15% in North Africa and the Middle East, 8% in the Americas, and 1% in Asia and Oceania. French is the second most widely spoken mother tongue in the European Union. Of Europeans who speak other languages natively, approximately one-fifth are able to speak French as a second language. French is the second most taught foreign language in the EU. All institutions of the EU use French as a working language along with English and German; in certain institutions, French is the sole working language (e.g. at the Court of Justice of the European Union). French is also the 18th most natively spoken language in the world, fifth most spoken language by total number of speakers and the second or third most studied language worldwide (with about 120 million learners as of 2017). As a result of French and Belgian colonialism from the 16th century onward, French was introduced to new territories in the Americas, Africa and Asia. Most second-language speakers reside in Francophone Africa, in particular Gabon, Algeria, Morocco, Tunisia, Mauritius, Senegal and Ivory Coast. French is estimated to have about 76 million native speakers; about 235 million daily, fluent speakers; and another 77–110 million secondary speakers who speak it as a second language to varying degrees of proficiency, mainly in Africa. According to the OIF, approximately 321 million people worldwide are "able to speak the language", without specifying the criteria for this estimation or whom it encompasses. According to a demographic projection led by the Université Laval and the Réseau Démographie de l'Agence universitaire de la Francophonie, the total number of French speakers will reach approximately 500 million in 2025 and 650 million by 2050. OIF estimates 700 million by 2050, 80% of whom will be in Africa. French has a long history as an international language of literature and scientific standards and is a primary or second language of many international organisations including the United Nations, the European Union, the North Atlantic Treaty Organization, the World Trade Organization, the International Olympic Committee, and the International Committee of the Red Cross. In 2011, Bloomberg Businessweek ranked French the third most useful language for business, after English and Standard Mandarin Chinese.

The majority of French words derive from Vulgar Latin or were constructed from Latin or Greek roots. In many cases, a single etymological root appears in French in a "popular" or native form, inherited from Vulgar Latin, and a learned form, borrowed later from Classical Latin. The following pairs consist of a native noun and a learned adjective: brother: frère / fraternel from Latin frater / fraternalis finger: doigt / digital from Latin digitus / digitalis faith: foi / fidèle from Latin fides / fidelis eye: œil / oculaire from Latin oculus / ocularis However, a historical tendency to Gallicise Latin roots can be identified, whereas English conversely leans towards a more direct incorporation of the Latin: rayonnement / radiation from Latin radiatio éteindre / extinguish from Latin exstinguere noyau / nucleus from Latin nucleus ensoleillement / insolation from Latin insolatio There are also noun-noun and adjective-adjective pairs: thing/cause: chose / cause from Latin causa cold: froid / frigide from Latin frigidum It can be difficult to identify the Latin source of native French words because in the evolution from Vulgar Latin, unstressed syllables were severely reduced and the remaining vowels and consonants underwent significant modifications. More recently the linguistic policy of the French language academies of France and Quebec has been to provide French equivalents to (mainly English) imported words, either by using existing vocabulary, extending its meaning or deriving a new word according to French morphological rules. The result is often two (or more) co-existing terms for describing the same phenomenon. mercatique / marketing finance fantôme / shadow banking bloc-notes / notepad ailière / wingsuit tiers-lieu / coworking It is estimated that 12% (4,200) of common French words found in a typical dictionary such as the Petit Larousse or Micro-Robert Plus (35,000 words) are of foreign origin (where Greek and Latin learned words are not seen as foreign). About 25% (1,054) of these foreign words come from English and are fairly recent borrowings. The others are some 707 words from Italian, 550 from ancient Germanic languages, 481 from other Gallo-Romance languages, 215 from Arabic, 164 from German, 160 from Celtic languages, 159 from Spanish, 153 from Dutch, 112 from Persian and Sanskrit, 101 from Native American languages, 89 from other Asian languages, 56 from other Afro-Asiatic languages, 55 from Balto-Slavic languages, 10 from Basque and 144 (about 3%) from other languages. One study analyzing the degree of differentiation of Romance languages in comparison to Latin estimated that among the languages analyzed French has the greatest distance from Latin. Lexical similarity is 89% with Italian, 80% with Sardinian, 78% with Rhaeto-Romance, and 75% with Romanian, Spanish and Portuguese.

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https://en.wikipedia.org/wiki/History%20of%20film

History of film

1960s

The history of film chronicles the development of a visual art form created using film technologies that began in the late 19th century. Although the advent of film as an artistic medium is not clearly defined, the commercial, public screening of ten of the Lumière brothers' short films in Paris on 28 December 1895 can be regarded as the breakthrough of projected cinematographic motion pictures. There had been earlier cinematographic results and screenings by others like the Skladanowsky brothers, who used their self-made Bioscop to display the first moving picture show to a paying audience on 1 November 1895 in Berlin, but they lacked either the quality, financial backing, stamina or the luck to find the momentum that propelled the cinématographe Lumière into a worldwide success. Soon film production companies and studios were established all over the world. The first decade of motion picture saw film moving from a novelty to an established mass entertainment industry. The earliest films were in black and white, under a minute long, without recorded sound and consisted of a single shot from a steady camera. Conventions toward a general cinematic language developed over the years with editing, camera movements and other cinematic techniques contributing specific roles in the narrative of films. Special effects became a feature in movies since the late 1890s, popularized by Georges Méliès' fantasy films. Many effects were impossible or impractical to perform in theater plays and thus added more magic to the experience of movies. Technical improvements added length (reaching 60 minutes for a feature film in 1906), synchronized sound recording (mainstream since the end of the 1920s), color (mainstream since the 1930s) and 3D (temporarily popular in the early 1950s and mainstream since the 2000s). Sound ended the necessity of interruptions of title cards, revolutionized the narrative possibilities for filmmakers, and became an integral part of moviemaking. Popular new media, including television (mainstream since the 1950s), home video (mainstream since the 1980s), and internet (mainstream since the 1990s) influenced the distribution and consumption of films. Film production usually responded with content to fit the new media, and with technical innovations (including widescreen (mainstream since the 1950s), 3D and 4D film) and more spectacular films to keep theatrical screenings attractive. Systems that were cheaper and more easily handled (including 8mm film, video and smartphone cameras) allowed for an increasing number of people to create films of varying qualities, for any purpose (including home movies and video art). The technical quality was usually lower than that of professional movies, but improved with digital video and affordable high quality digital cameras. Improving over time, digital production methods became more and more popular during the 1990s, resulting in increasingly realistic visual effects and popular feature-length computer animations. Different film genres emerged and enjoyed variable degrees of success over time, with huge differences among, for instance, horror films (mainstream since the 1890s), newsreels (prevalent in U.S. cinemas between the 1910s and the late 1960s), musicals (mainstream since the late 1920s) and pornographic films (experiencing a Golden Age during the 1970s).

During the 1960s, the studio system in Hollywood declined, because many films were now being made on location in other countries, or using studio facilities abroad, such as Pinewood in the UK and Cinecittà in Rome. "Hollywood" films were still largely aimed at family audiences, and it was often the more old-fashioned films that produced the studios' biggest successes. Productions like Mary Poppins (1964), My Fair Lady (1964) and The Sound of Music (1965) were among the biggest money-makers of the decade. The growth in independent producers and production companies, and the increase in the power of individual actors also contributed to the decline of traditional Hollywood studio production. There was also an increasing awareness of foreign language cinema in America during this period. During the late 1950s and 1960s, the French New Wave directors such as François Truffaut and Jean-Luc Godard produced films such as Les quatre cents coups, Breathless and Jules et Jim which broke the rules of Hollywood cinema's narrative structure. As well, audiences were becoming aware of Italian films like Federico Fellini's La Dolce Vita (1960), 8½ (1963) and the stark dramas of Sweden's Ingmar Bergman. In Britain, the "Free Cinema" of Lindsay Anderson, Tony Richardson and others lead to a group of realistic and innovative dramas including Saturday Night and Sunday Morning, A Kind of Loving and This Sporting Life. Other British films such as Repulsion, Darling, Alfie, Blowup and Georgy Girl (all in 1965–1966) helped to reduce prohibitions of sex and nudity on screen, while the casual sex and violence of the James Bond films, beginning with Dr. No in 1962 would render the series popular worldwide. During the 1960s, Ousmane Sembène produced several French- and Wolof-language films and became the "father" of African Cinema. In Latin America, the dominance of the "Hollywood" model was challenged by many film makers. Fernando Solanas and Octavio Getino called for a politically engaged Third Cinema in contrast to Hollywood and the European auteur cinema. In Egypt, the golden age of Egyptian cinema continued in the 1960s at the hands of many directors, and Egyptian cinema greatly appreciated women at that time, such as Soad Hosny. The Zulfikar brothers; Ezz El-Dine Zulfikar, Salah Zulfikar and Mahmoud Zulfikar were on a date with many productions, including Ezz El Dine Zulfikar's The River of Love (1960), Mahmoud Zulfikar's Soft Hands (1964), and Dearer Than My Life (1965) starring Salah Zulfikar and Salah Zulfikar's production; My Wife, the Director General (1966) as well as Youssef Chahine's Saladin (1963). Further, the nuclear paranoia of the age, and the threat of an apocalyptic nuclear exchange (like the 1962 close-call with the USSR during the Cuban Missile Crisis) prompted a reaction within the film community as well. Films like Stanley Kubrick's Dr. Strangelove and Fail Safe with Henry Fonda were produced in a Hollywood that was once known for its overt patriotism and wartime propaganda. In documentary film the sixties saw the blossoming of Direct Cinema, an observational style of film making as well as the advent of more overtly partisan films like In the Year of the Pig about the Vietnam War by Emile de Antonio. By the late 1960s however, Hollywood filmmakers were beginning to create more innovative and groundbreaking films that reflected the social revolution taken over much of the western world such as Bonnie and Clyde (1967), The Graduate (1967), 2001: A Space Odyssey (1968), Rosemary's Baby (1968), Midnight Cowboy (1969), Easy Rider (1969) and The Wild Bunch (1969). Bonnie and Clyde is often considered the beginning of the so-called New Hollywood. In Japanese cinema, Academy Award-winning director Akira Kurosawa produced Yojimbo (1961), which like his previous films also had a profound influence around the world. The influence of this film is most apparent in Sergio Leone's A Fistful of Dollars (1964) and Walter Hill's Last Man Standing (1996). Yojimbo was also the origin of the "Man with No Name" trend.

projected-00010783-028

https://en.wikipedia.org/wiki/History%20of%20film

History of film

1980s

The history of film chronicles the development of a visual art form created using film technologies that began in the late 19th century. Although the advent of film as an artistic medium is not clearly defined, the commercial, public screening of ten of the Lumière brothers' short films in Paris on 28 December 1895 can be regarded as the breakthrough of projected cinematographic motion pictures. There had been earlier cinematographic results and screenings by others like the Skladanowsky brothers, who used their self-made Bioscop to display the first moving picture show to a paying audience on 1 November 1895 in Berlin, but they lacked either the quality, financial backing, stamina or the luck to find the momentum that propelled the cinématographe Lumière into a worldwide success. Soon film production companies and studios were established all over the world. The first decade of motion picture saw film moving from a novelty to an established mass entertainment industry. The earliest films were in black and white, under a minute long, without recorded sound and consisted of a single shot from a steady camera. Conventions toward a general cinematic language developed over the years with editing, camera movements and other cinematic techniques contributing specific roles in the narrative of films. Special effects became a feature in movies since the late 1890s, popularized by Georges Méliès' fantasy films. Many effects were impossible or impractical to perform in theater plays and thus added more magic to the experience of movies. Technical improvements added length (reaching 60 minutes for a feature film in 1906), synchronized sound recording (mainstream since the end of the 1920s), color (mainstream since the 1930s) and 3D (temporarily popular in the early 1950s and mainstream since the 2000s). Sound ended the necessity of interruptions of title cards, revolutionized the narrative possibilities for filmmakers, and became an integral part of moviemaking. Popular new media, including television (mainstream since the 1950s), home video (mainstream since the 1980s), and internet (mainstream since the 1990s) influenced the distribution and consumption of films. Film production usually responded with content to fit the new media, and with technical innovations (including widescreen (mainstream since the 1950s), 3D and 4D film) and more spectacular films to keep theatrical screenings attractive. Systems that were cheaper and more easily handled (including 8mm film, video and smartphone cameras) allowed for an increasing number of people to create films of varying qualities, for any purpose (including home movies and video art). The technical quality was usually lower than that of professional movies, but improved with digital video and affordable high quality digital cameras. Improving over time, digital production methods became more and more popular during the 1990s, resulting in increasingly realistic visual effects and popular feature-length computer animations. Different film genres emerged and enjoyed variable degrees of success over time, with huge differences among, for instance, horror films (mainstream since the 1890s), newsreels (prevalent in U.S. cinemas between the 1910s and the late 1960s), musicals (mainstream since the late 1920s) and pornographic films (experiencing a Golden Age during the 1970s).

During the 1980s, audiences began increasingly watching films on their home VCRs. In the early part of that decade, the film studios tried legal action to ban home ownership of VCRs as a violation of copyright, which proved unsuccessful. Eventually, the sale and rental of films on home video became a significant "second venue" for exhibition of films, and an additional source of revenue for the film industries. Direct-to-video (niche) markets usually offered lower quality, cheap productions that were not deemed very suitable for the general audiences of television and theatrical releases. The Lucas–Spielberg combine would dominate "Hollywood" cinema for much of the 1980s, and lead to much imitation. Two follow-ups to Star Wars, three to Jaws, and three Indiana Jones films helped to make sequels of successful films more of an expectation than ever before. Lucas also launched THX Ltd, a division of Lucasfilm in 1982, while Spielberg enjoyed one of the decade's greatest successes in E.T. the Extra-Terrestrial the same year. 1982 also saw the release of Disney's Tron which was one of the first films from a major studio to use computer graphics extensively. American independent cinema struggled more during the decade, although Martin Scorsese's Raging Bull (1980), After Hours (1985), and The King of Comedy (1983) helped to establish him as one of the most critically acclaimed American film makers of the era. Also during 1983 Scarface was released, which was very profitable and resulted in even greater fame for its leading actor Al Pacino. Probably the most successful film commercially was Tim Burton's 1989 version of Bob Kane's creation, Batman, which broke box-office records. Jack Nicholson's portrayal of the demented Joker earned him a total of $60,000,000 after figuring in his percentage of the gross. British cinema was given a boost during the early 1980s by the arrival of David Puttnam's company Goldcrest Films. The films Chariots of Fire, Gandhi, The Killing Fields and A Room with a View appealed to a "middlebrow" audience which was increasingly being ignored by the major Hollywood studios. While the films of the 1970s had helped to define modern blockbuster motion pictures, the way "Hollywood" released its films would now change. Films, for the most part, would premiere in a wider number of theatres, although, to this day, some films still premiere using the route of the limited/roadshow release system. Against some expectations, the rise of the multiplex cinema did not allow less mainstream films to be shown, but simply allowed the major blockbusters to be given an even greater number of screenings. However, films that had been overlooked in cinemas were increasingly being given a second chance on home video. During the 1980s, Japanese cinema experienced a revival, largely due to the success of anime films. At the beginning of the 1980s, Space Battleship Yamato (1973) and Mobile Suit Gundam (1979), both of which were unsuccessful as television series, were remade as films and became hugely successful in Japan. In particular, Mobile Suit Gundam sparked the Gundam franchise of Real Robot mecha anime. The success of Macross: Do You Remember Love? also sparked a Macross franchise of mecha anime. This was also the decade when Studio Ghibli was founded. The studio produced Hayao Miyazaki's first fantasy films, Nausicaä of the Valley of the Wind (1984) and Castle in the Sky (1986), as well as Isao Takahata's Grave of the Fireflies (1988), all of which were very successful in Japan and received worldwide critical acclaim. Original video animation (OVA) films also began during this decade; the most influential of these early OVA films was Noboru Ishiguro's cyberpunk film Megazone 23 (1985). The most famous anime film of this decade was Katsuhiro Otomo's cyberpunk film Akira (1988), which although initially unsuccessful at Japanese theaters, went on to become an international success. Hong Kong action cinema, which was in a state of decline due to endless Bruceploitation films after the death of Bruce Lee, also experienced a revival in the 1980s, largely due to the reinvention of the action film genre by Jackie Chan. He had previously combined the comedy film and martial arts film genres successfully in the 1978 films Snake in the Eagle's Shadow and Drunken Master. The next step he took was in combining this comedy martial arts genre with a new emphasis on elaborate and highly dangerous stunts, reminiscent of the silent film era. The first film in this new style of action cinema was Project A (1983), which saw the formation of the Jackie Chan Stunt Team as well as the "Three Brothers" (Chan, Sammo Hung and Yuen Biao). The film added elaborate, dangerous stunts to the fights and slapstick humor, and became a huge success throughout the Far East. As a result, Chan continued this trend with martial arts action films containing even more elaborate and dangerous stunts, including Wheels on Meals (1984), Police Story (1985), Armour of God (1986), Project A Part II (1987), Police Story 2 (1988), and Dragons Forever (1988). Other new trends which began in the 1980s were the "girls with guns" subgenre, for which Michelle Yeoh gained fame; and especially the "heroic bloodshed" genre, revolving around Triads, largely pioneered by John Woo and for which Chow Yun-fat became famous. These Hong Kong action trends were later adopted by many Hollywood action films in the 1990s and 2000s. In Indian cinema, another star actor, considered by many to be the most natural actor in Indian cinema, Mohanlal acted in his first movie. During the 80's he rose to become a super star in Indian cinema. Indian cinema as a whole was changing in a new wave of movies and directors.

wit-train-topic-001685177

projected-00011185-022

https://en.wikipedia.org/wiki/Feminism

Feminism

Demographics

Feminism is a range of socio-political movements and ideologies that aim to define and establish the political, economic, personal, and social equality of the sexes. Feminism incorporates the position that society prioritizes the male point of view and that women are treated unjustly in these societies. Efforts to change this include fighting against gender stereotypes and establishing educational, professional, and interpersonal opportunities and outcomes for women that are equal to those for men. Feminist movements have campaigned and continue to campaign for women's rights, including the right to vote, run for public office, work, earn equal pay, own property, receive education, enter contracts, have equal rights within marriage, and maternity leave. Feminists have also worked to ensure access to contraception, legal abortions, and social integration and to protect women and girls from rape, sexual harassment, and domestic violence. Changes in female dress standards and acceptable physical activities for females have often been part of feminist movements. Some scholars consider feminist campaigns to be a main force behind major historical societal changes for women's rights, particularly in the West, where they are near-universally credited with achieving women's suffrage, gender-neutral language, reproductive rights for women (including access to contraceptives and abortion), and the right to enter into contracts and own property. Although feminist advocacy is, and has been, mainly focused on women's rights, some feminists argue for the inclusion of men's liberation within its aims, because they believe that men are also harmed by traditional gender roles. Feminist theory, which emerged from feminist movements, aims to understand the nature of gender inequality by examining women's social roles and lived experience; feminist theorists have developed theories in a variety of disciplines in order to respond to issues concerning gender. Numerous feminist movements and ideologies have developed over the years and represent different viewpoints and aims. Traditionally, since the 19th century, first-wave liberal feminism that sought political and legal equality through reforms within a liberal democratic framework was contrasted with labour-based proletarian women's movements that over time developed into socialist and Marxist feminism based on class struggle theory. Since the 1960s, both of these traditions are also contrasted with radical feminism that arose from the radical wing of second-wave feminism and that calls for a radical reordering of society to eliminate male supremacy; together liberal, socialist and radical feminism are sometimes called the "Big Three" schools of feminist thought. Since the late 20th century, many newer forms of feminisms have emerged. Some forms of feminism have been criticized for taking into account only white, middle class, college-educated, heterosexual, or cisgender perspectives. These criticisms have led to the creation of ethnically specific or multicultural forms of feminism, such as black feminism and intersectional feminism. Some feminists have argued that feminism often promotes misandry and the elevation of women's interests above men's, and criticize radical feminist positions as harmful to both men and women.

According to 2014 Ipsos poll covering 15 developed countries, 53 percent of respondents identified as feminists, and 87 percent agreed that "women should be treated equally to men in all areas based on their competency, not their gender". However, only 55 percent of women agreed that they have "full equality with men and the freedom to reach their full dreams and aspirations". Taken together, these studies reflect the importance differentiating between claiming a "feminist identity" and holding "feminist attitudes or beliefs". According to a 2015 poll, 18 percent of Americans use the label of "feminist" to describe themselves, while 85 percent are feminists in practice as they reported they believe in "equality for women". The poll found that 52 percent did not identify as feminist, 26 percent were unsure, and 4 percent provided no response. Sociological research shows that, in the US, increased educational attainment is associated with greater support for feminist issues. In addition, politically liberal people are more likely to support feminist ideals compared to those who are conservative. According to numerous polls, 7 percent of Britons use the label of "feminist" to describe themselves.

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https://en.wikipedia.org/wiki/Feminism

Feminism

Sexuality

Feminism is a range of socio-political movements and ideologies that aim to define and establish the political, economic, personal, and social equality of the sexes. Feminism incorporates the position that society prioritizes the male point of view and that women are treated unjustly in these societies. Efforts to change this include fighting against gender stereotypes and establishing educational, professional, and interpersonal opportunities and outcomes for women that are equal to those for men. Feminist movements have campaigned and continue to campaign for women's rights, including the right to vote, run for public office, work, earn equal pay, own property, receive education, enter contracts, have equal rights within marriage, and maternity leave. Feminists have also worked to ensure access to contraception, legal abortions, and social integration and to protect women and girls from rape, sexual harassment, and domestic violence. Changes in female dress standards and acceptable physical activities for females have often been part of feminist movements. Some scholars consider feminist campaigns to be a main force behind major historical societal changes for women's rights, particularly in the West, where they are near-universally credited with achieving women's suffrage, gender-neutral language, reproductive rights for women (including access to contraceptives and abortion), and the right to enter into contracts and own property. Although feminist advocacy is, and has been, mainly focused on women's rights, some feminists argue for the inclusion of men's liberation within its aims, because they believe that men are also harmed by traditional gender roles. Feminist theory, which emerged from feminist movements, aims to understand the nature of gender inequality by examining women's social roles and lived experience; feminist theorists have developed theories in a variety of disciplines in order to respond to issues concerning gender. Numerous feminist movements and ideologies have developed over the years and represent different viewpoints and aims. Traditionally, since the 19th century, first-wave liberal feminism that sought political and legal equality through reforms within a liberal democratic framework was contrasted with labour-based proletarian women's movements that over time developed into socialist and Marxist feminism based on class struggle theory. Since the 1960s, both of these traditions are also contrasted with radical feminism that arose from the radical wing of second-wave feminism and that calls for a radical reordering of society to eliminate male supremacy; together liberal, socialist and radical feminism are sometimes called the "Big Three" schools of feminist thought. Since the late 20th century, many newer forms of feminisms have emerged. Some forms of feminism have been criticized for taking into account only white, middle class, college-educated, heterosexual, or cisgender perspectives. These criticisms have led to the creation of ethnically specific or multicultural forms of feminism, such as black feminism and intersectional feminism. Some feminists have argued that feminism often promotes misandry and the elevation of women's interests above men's, and criticize radical feminist positions as harmful to both men and women.

Feminist views on sexuality vary, and have differed by historical period and by cultural context. Feminist attitudes to female sexuality have taken a few different directions. Matters such as the sex industry, sexual representation in the media, and issues regarding consent to sex under conditions of male dominance have been particularly controversial among feminists. This debate has culminated in the late 1970s and the 1980s, in what came to be known as the feminist sex wars, which pitted anti-pornography feminism against sex-positive feminism, and parts of the feminist movement were deeply divided by these debates. Feminists have taken a variety of positions on different aspects of the sexual revolution from the 1960s and 70s. Over the course of the 1970s, a large number of influential women accepted lesbian and bisexual women as part of feminism.

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https://en.wikipedia.org/wiki/Gold

Gold

Occurrence

Gold is a chemical element with the symbol Au (from ) and atomic number 79. This makes it one of the higher atomic number elements that occur naturally. It is a bright, slightly orange-yellow, dense, soft, malleable, and ductile metal in a pure form. Chemically, gold is a transition metal and a group 11 element. It is one of the least reactive chemical elements and is solid under standard conditions. Gold often occurs in free elemental (native) form, as nuggets or grains, in rocks, veins, and alluvial deposits. It occurs in a solid solution series with the native element silver (as electrum), naturally alloyed with other metals like copper and palladium, and mineral inclusions such as within pyrite. Less commonly, it occurs in minerals as gold compounds, often with tellurium (gold tellurides). Gold is resistant to most acids, though it does dissolve in aqua regia (a mixture of nitric acid and hydrochloric acid), forming a soluble tetrachloroaurate anion. Gold is insoluble in nitric acid alone, which dissolves silver and base metals, a property long used to refine gold and confirm the presence of gold in metallic substances, giving rise to the term 'acid test'. Gold dissolves in alkaline solutions of cyanide, which are used in mining and electroplating. Gold also dissolves in mercury, forming amalgam alloys, and as the gold acts simply as a solute, this is not a chemical reaction. A relatively rare element, gold is a precious metal that has been used for coinage, jewelry, and other arts throughout recorded history. In the past, a gold standard was often implemented as a monetary policy. Gold coins ceased to be minted as a circulating currency in the 1930s, and the world gold standard was abandoned for a fiat currency system after the Nixon shock measures of 1971. In 2020, the world's largest gold producer was China, followed by Russia and Australia. A total of around 201,296 tonnes of gold exists above ground, . This is equal to a cube with each side measuring roughly . The world consumption of new gold produced is about 50% in jewelry, 40% in investments and 10% in industry. Gold's high malleability, ductility, resistance to corrosion and most other chemical reactions, and conductivity of electricity have led to its continued use in corrosion-resistant electrical connectors in all types of computerized devices (its chief industrial use). Gold is also used in infrared shielding, production of colored glass, gold leafing, and tooth restoration. Certain gold salts are still used as anti-inflammatories in medicine.

On Earth, gold is found in ores in rock formed from the Precambrian time onward. It most often occurs as a native metal, typically in a metal solid solution with silver (i.e. as a gold/silver alloy). Such alloys usually have a silver content of 8–10%. Electrum is elemental gold with more than 20% silver, and is commonly known as white gold. Electrum's color runs from golden-silvery to silvery, dependent upon the silver content. The more silver, the lower the specific gravity. Native gold occurs as very small to microscopic particles embedded in rock, often together with quartz or sulfide minerals such as "fool's gold", which is a pyrite. These are called lode deposits. The metal in a native state is also found in the form of free flakes, grains or larger nuggets that have been eroded from rocks and end up in alluvial deposits called placer deposits. Such free gold is always richer at the exposed surface of gold-bearing veins, owing to the oxidation of accompanying minerals followed by weathering; and by washing of the dust into streams and rivers, where it collects and can be welded by water action to form nuggets. Gold sometimes occurs combined with tellurium as the minerals calaverite, krennerite, nagyagite, petzite and sylvanite (see telluride minerals), and as the rare bismuthide maldonite () and antimonide aurostibite (). Gold also occurs in rare alloys with copper, lead, and mercury: the minerals auricupride (), novodneprite () and weishanite (). Recent research suggests that microbes can sometimes play an important role in forming gold deposits, transporting and precipitating gold to form grains and nuggets that collect in alluvial deposits. Another recent study has claimed water in faults vaporizes during an earthquake, depositing gold. When an earthquake strikes, it moves along a fault. Water often lubricates faults, filling in fractures and jogs. About below the surface, under very high temperatures and pressures, the water carries high concentrations of carbon dioxide, silica, and gold. During an earthquake, the fault jog suddenly opens wider. The water inside the void instantly vaporizes, flashing to steam and forcing silica, which forms the mineral quartz, and gold out of the fluids and onto nearby surfaces.

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https://en.wikipedia.org/wiki/Gold

Gold

Toxicity

Gold is a chemical element with the symbol Au (from ) and atomic number 79. This makes it one of the higher atomic number elements that occur naturally. It is a bright, slightly orange-yellow, dense, soft, malleable, and ductile metal in a pure form. Chemically, gold is a transition metal and a group 11 element. It is one of the least reactive chemical elements and is solid under standard conditions. Gold often occurs in free elemental (native) form, as nuggets or grains, in rocks, veins, and alluvial deposits. It occurs in a solid solution series with the native element silver (as electrum), naturally alloyed with other metals like copper and palladium, and mineral inclusions such as within pyrite. Less commonly, it occurs in minerals as gold compounds, often with tellurium (gold tellurides). Gold is resistant to most acids, though it does dissolve in aqua regia (a mixture of nitric acid and hydrochloric acid), forming a soluble tetrachloroaurate anion. Gold is insoluble in nitric acid alone, which dissolves silver and base metals, a property long used to refine gold and confirm the presence of gold in metallic substances, giving rise to the term 'acid test'. Gold dissolves in alkaline solutions of cyanide, which are used in mining and electroplating. Gold also dissolves in mercury, forming amalgam alloys, and as the gold acts simply as a solute, this is not a chemical reaction. A relatively rare element, gold is a precious metal that has been used for coinage, jewelry, and other arts throughout recorded history. In the past, a gold standard was often implemented as a monetary policy. Gold coins ceased to be minted as a circulating currency in the 1930s, and the world gold standard was abandoned for a fiat currency system after the Nixon shock measures of 1971. In 2020, the world's largest gold producer was China, followed by Russia and Australia. A total of around 201,296 tonnes of gold exists above ground, . This is equal to a cube with each side measuring roughly . The world consumption of new gold produced is about 50% in jewelry, 40% in investments and 10% in industry. Gold's high malleability, ductility, resistance to corrosion and most other chemical reactions, and conductivity of electricity have led to its continued use in corrosion-resistant electrical connectors in all types of computerized devices (its chief industrial use). Gold is also used in infrared shielding, production of colored glass, gold leafing, and tooth restoration. Certain gold salts are still used as anti-inflammatories in medicine.

Pure metallic (elemental) gold is non-toxic and non-irritating when ingested and is sometimes used as a food decoration in the form of gold leaf. Metallic gold is also a component of the alcoholic drinks Goldschläger, Gold Strike, and Goldwasser. Metallic gold is approved as a food additive in the EU (E175 in the Codex Alimentarius). Although the gold ion is toxic, the acceptance of metallic gold as a food additive is due to its relative chemical inertness, and resistance to being corroded or transformed into soluble salts (gold compounds) by any known chemical process which would be encountered in the human body. Soluble compounds (gold salts) such as gold chloride are toxic to the liver and kidneys. Common cyanide salts of gold such as potassium gold cyanide, used in gold electroplating, are toxic by virtue of both their cyanide and gold content. There are rare cases of lethal gold poisoning from potassium gold cyanide. Gold toxicity can be ameliorated with chelation therapy with an agent such as dimercaprol. Gold metal was voted Allergen of the Year in 2001 by the American Contact Dermatitis Society; gold contact allergies affect mostly women. Despite this, gold is a relatively non-potent contact allergen, in comparison with metals like nickel. A sample of the fungus Aspergillus niger was found growing from gold mining solution; and was found to contain cyano metal complexes, such as gold, silver, copper, iron and zinc. The fungus also plays a role in the solubilization of heavy metal sulfides.

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https://en.wikipedia.org/wiki/Ganges

Ganges

Geology

The Ganges ( ) (in India: Ganga ( ); in Bangladesh: Padma ( )) is a trans-boundary river of Asia which flows through India and Bangladesh. The river rises in the western Himalayas in the Indian state of Uttarakhand. It flows south and east through the Gangetic plain of North India, receiving the right-bank tributary, the Yamuna, which also rises in the western Indian Himalayas, and several left-bank tributaries from Nepal that account for the bulk of its flow. In West Bengal state, India, a feeder canal taking off from its right bank diverts 50% of its flow southwards, artificially connecting it to the Hooghly river. The Ganges continues into Bangladesh, its name changing to the Padma. It is then joined by the Jamuna, the lower stream of the Brahmaputra, and eventually the Meghna, forming the major estuary of the Ganges Delta, and emptying into the Bay of Bengal. The Ganges-Brahmaputra-Meghna system is the third largest river on earth by discharge. The main stem of the Ganges begins at the town of Devprayag, at the confluence of the Alaknanda, which is the source stream in hydrology on account of its greater length, and the Bhagirathi, which is considered the source stream in Hindu mythology. The Ganges is a lifeline to millions of people who live in its basin and depend on it for their daily needs. It has been important historically, with many former provincial or imperial capitals such as Pataliputra, Kannauj, Kara, Munger, Kashi, Patna, Hajipur, Delhi, Bhagalpur, Murshidabad, Baharampur, Kampilya, and Kolkata located on its banks or the banks of tributaries and connected waterways. The river is home to approximately 140 species of fish, 90 species of amphibians, and also reptiles and mammals, including critically endangered species such as the gharial and South Asian river dolphin. The Ganges is the most sacred river to Hindus. It is worshipped as the goddess Ganga in Hinduism. The Ganges is threatened by severe pollution. This poses a danger not only to humans but also to animals. The levels of fecal coliform bacteria from human waste in the river near Varanasi are more than a hundred times the Indian government's official limit. The Ganga Action Plan, an environmental initiative to clean up the river, has been considered a failure which is variously attributed to corruption, a lack of will in the government, poor technical expertise, environmental planning and a lack of support from religious authorities.

The Indian subcontinent lies atop the Indian tectonic plate, a minor plate within the Indo-Australian Plate. Its defining geological processes commenced seventy-five million years ago, when, as a part of the southern supercontinent Gondwana, it began a northeastwards drift—lasting fifty million years—across the then unformed Indian Ocean. The subcontinent's subsequent collision with the Eurasian Plate and subduction under it, gave rise to the Himalayas, the planet's highest mountain ranges. In the former seabed immediately south of the emerging Himalayas, plate movement created a vast trough, which, having gradually been filled with sediment borne by the Indus and its tributaries and the Ganges and its tributaries, now forms the Indo-Gangetic Plain. The Indo-Gangetic Plain is geologically known as a foredeep or foreland basin.

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https://en.wikipedia.org/wiki/Galaxy

Galaxy

Etymology

A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter. The word is derived from the Greek (), literally 'milky', a reference to the Milky Way galaxy that contains the Solar System. Galaxies, averaging an estimated 100 million stars, range in size from dwarfs with less than a hundred million () stars, to the largest galaxies known - supergiants with one hundred trillion () stars, each orbiting its galaxy's center of mass. Galaxies are categorized according to their visual morphology as elliptical, spiral, or irregular. Many are thought to have supermassive black holes at their centers. The Milky Way's central black hole, known as Sagittarius A*, has a mass four million times greater than the Sun. As of March 2016, GN-z11 is the oldest and most distant galaxy observed. It has a comoving distance of 32 billion light-years from Earth, and is seen as it existed just 400 million years after the Big Bang. In 2016, using 20 years of images from the Hubble space telescope, it was estimated that there were in total two trillion () or more galaxies in the observable universe, and as many as an estimated stars (more stars than all the grains of sand on all beaches of the planet Earth). In 2021, data from NASA's New Horizons space probe was used to revise the earlier estimate to roughly 200 billion galaxies (), Most galaxies are 1,000 to 100,000 parsecs in diameter (approximately 3,000 to 300,000 light years) and are separated by distances on the order of millions of parsecs (or megaparsecs). For comparison, the Milky Way has a diameter of at least 26,800 parsecs (87,400 ly) and is separated from the Andromeda Galaxy (with diameter of about 152,000 ly), its nearest large neighbor, by 780,000 parsecs (2.5 million ly.) The space between galaxies is filled with a tenuous gas (the intergalactic medium) with an average density of less than one atom per cubic meter. Most galaxies are gravitationally organized into groups, clusters and superclusters. The Milky Way is part of the Local Group, which it dominates along with Andromeda Galaxy. The group is part of the Virgo Supercluster. At the largest scale, these associations are generally arranged into sheets and filaments surrounded by immense voids. Both the Local Group and the Virgo Supercluster are contained in a much larger cosmic structure named Laniakea.

The word galaxy was borrowed via French and Medieval Latin from the Greek term for the Milky Way, () 'milky (circle)', named after its appearance as a milky band of light in the sky. In Greek mythology, Zeus places his son born by a mortal woman, the infant Heracles, on Hera's breast while she is asleep so the baby will drink her divine milk and thus become immortal. Hera wakes up while breastfeeding and then realizes she is nursing an unknown baby: she pushes the baby away, some of her milk spills, and it produces the band of light known as the Milky Way. In the astronomical literature, the capitalized word "Galaxy" is often used to refer to the Milky Way galaxy, to distinguish it from the other galaxies in the observable universe. The English term Milky Way can be traced back to a story by Chaucer : Galaxies were initially discovered telescopically and were known as spiral nebulae. Most 18th- to 19th-century astronomers considered them as either unresolved star clusters or anagalactic nebulae, and were just thought of as a part of the Milky Way, but their true composition and natures remained a mystery. Observations using larger telescopes of a few nearby bright galaxies, like the Andromeda Galaxy, began resolving them into huge conglomerations of stars, but based simply on the apparent faintness and sheer population of stars, the true distances of these objects placed them well beyond the Milky Way. For this reason they were popularly called island universes, but this term quickly fell into disuse, as the word universe implied the entirety of existence. Instead, they became known simply as galaxies.

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https://en.wikipedia.org/wiki/Grammar

Grammar

Education

In linguistics, the grammar of a natural language is its set of structural constraints on speakers' or writers' composition of clauses, phrases, and words. The term can also refer to the study of such constraints, a field that includes domains such as phonology, morphology, and syntax, often complemented by phonetics, semantics, and pragmatics. There are currently two different approaches to the study of grammar: traditional grammar and theoretical grammar. Fluent speakers of a language variety or lect have effectively internalized these constraints, the vast majority of which – at least in the case of one's native language(s) – are acquired not by conscious study or instruction but by hearing other speakers. Much of this internalization occurs during early childhood; learning a language later in life usually involves more explicit instruction. In this view, grammar is understood as the cognitive information underlying a specific instance of language production. The term "grammar" can also describe the linguistic behavior of groups of speakers and writers rather than individuals. Differences in scales are important to this sense of the word: for example, the term "English grammar" could refer to the whole of English grammar (that is, to the grammar of all the speakers of the language), in which case the term encompasses a great deal of variation. At a smaller scale, it may refer only to what is shared among the grammars of all or most English speakers (such as subject–verb–object word order in simple declarative sentences). At the smallest scale, this sense of "grammar" can describe the conventions of just one relatively well-defined form of English (such as standard English for a region). A description, study, or analysis of such rules may also be referred to as grammar. A reference book describing the grammar of a language is called a "reference grammar" or simply "a grammar" (see History of English grammars). A fully explicit grammar, which exhaustively describes the grammatical constructions of a particular speech variety, is called descriptive grammar. This kind of linguistic description contrasts with linguistic prescription, an attempt to actively discourage or suppress some grammatical constructions while codifying and promoting others, either in an absolute sense or about a standard variety. For example, some prescriptivists maintain that sentences in English should not end with prepositions, a prohibition that has been traced to John Dryden (13 April 1668 – January 1688) whose unexplained objection to the practice perhaps led other English speakers to avoid the construction and discourage its use. Yet preposition stranding has a long history in Germanic languages like English, where it is so widespread as to be a standard usage. Outside linguistics, the term grammar is often used in a rather different sense. It may be used more broadly to include conventions of spelling and punctuation, which linguists would not typically consider as part of grammar but rather as part of orthography, the conventions used for writing a language. It may also be used more narrowly to refer to a set of prescriptive norms only, excluding those aspects of a language's grammar which are not subject to variation or debate on their normative acceptability. Jeremy Butterfield claimed that, for non-linguists, "Grammar is often a generic way of referring to any aspect of English that people object to."

Prescriptive grammar is taught in primary and secondary school. The term "grammar school" historically referred to a school (attached to a cathedral or monastery) that teaches Latin grammar to future priests and monks. It originally referred to a school that taught students how to read, scan, interpret, and declaim Greek and Latin poets (including Homer, Virgil, Euripides, and others). These should not be mistaken for the related, albeit distinct, modern British grammar schools. A standard language is a dialect that is promoted above other dialects in writing, education, and, broadly speaking, in the public sphere; it contrasts with vernacular dialects, which may be the objects of study in academic, descriptive linguistics but which are rarely taught prescriptively. The standardized "first language" taught in primary education may be subject to political controversy because it may sometimes establish a standard defining nationality or ethnicity. Recently, efforts have begun to update grammar instruction in primary and secondary education. The main focus has been to prevent the use of outdated prescriptive rules in favor of setting norms based on earlier descriptive research and to change perceptions about the relative "correctness" of prescribed standard forms in comparison to non-standard dialects. A series of metastudies have found that the explicit teaching of grammatical parts of speech and syntax has little or no effect on the improvement of student writing quality in elementary school, middle school of high school; other methods of writing instruction had far greater positive effect, including strategy instruction, collaborative writing, summary writing, process instruction, sentence combining and inquiry projects. The preeminence of Parisian French has reigned largely unchallenged throughout the history of modern French literature. Standard Italian is based on the speech of Florence rather than the capital because of its influence on early literature. Likewise, standard Spanish is not based on the speech of Madrid but on that of educated speakers from more northern areas such as Castile and León (see Gramática de la lengua castellana). In Argentina and Uruguay the Spanish standard is based on the local dialects of Buenos Aires and Montevideo (Rioplatense Spanish). Portuguese has, for now, two official standards, respectively Brazilian Portuguese and European Portuguese. The Serbian variant of Serbo-Croatian is likewise divided; Serbia and the Republika Srpska of Bosnia and Herzegovina use their own distinct normative subvarieties, with differences in yat reflexes. The existence and codification of a distinct Montenegrin standard is a matter of controversy, some treat Montenegrin as a separate standard lect, and some think that it should be considered another form of Serbian. Norwegian has two standards, Bokmål and Nynorsk, the choice between which is subject to controversy: Each Norwegian municipality can either declare one as its official language or it can remain "language neutral". Nynorsk is backed by 27 percent of municipalities. The main language used in primary schools, chosen by referendum within the local school district, normally follows the official language of its municipality. Standard German emerged from the standardized chancellery use of High German in the 16th and 17th centuries. Until about 1800, it was almost exclusively a written language, but now it is so widely spoken that most of the former German dialects are nearly extinct. Standard Chinese has official status as the standard spoken form of the Chinese language in the People's Republic of China (PRC), the Republic of China (ROC), and the Republic of Singapore. Pronunciation of Standard Chinese is based on the local accent of Mandarin Chinese from Luanping, Chengde in Hebei Province near Beijing, while grammar and syntax are based on modern vernacular written Chinese. Modern Standard Arabic is directly based on Classical Arabic, the language of the Qur'an. The Hindustani language has two standards, Hindi and Urdu. In the United States, the Society for the Promotion of Good Grammar designated 4 March as National Grammar Day in 2008.

projected-00012737-017

https://en.wikipedia.org/wiki/Gunpowder

Gunpowder

Chemistry

Gunpowder, also commonly known as black powder to distinguish it from modern smokeless powder, is the earliest known chemical explosive. It consists of a mixture of sulfur, carbon (in the form of charcoal) and potassium nitrate (saltpeter). The sulfur and carbon act as fuels while the saltpeter is an oxidizer. Gunpowder has been widely used as a propellant in firearms, artillery, rocketry, and pyrotechnics, including use as a blasting agent for explosives in quarrying, mining, building pipelines and road building. Gunpowder is classified as a low explosive because of its relatively slow decomposition rate and consequently low brisance. Low explosives deflagrate (i.e., burn at subsonic speeds), whereas high explosives detonate, producing a supersonic shockwave. Ignition of gunpowder packed behind a projectile generates enough pressure to force the shot from the muzzle at high speed, but usually not enough force to rupture the gun barrel. It thus makes a good propellant but is less suitable for shattering rock or fortifications with its low-yield explosive power. Nonetheless, it was widely used to fill fused artillery shells (and used in mining and civil engineering projects) until the second half of the 19th century, when the first high explosives were put into use. Its use in weapons has declined due to smokeless powder replacing it, and it is no longer used for industrial purposes due to its relative inefficiency compared to newer alternatives such as dynamite and ammonium nitrate/fuel oil.

A simple, commonly cited, chemical equation for the combustion of gunpowder is: 2 KNO3 + S + 3 C → K2S + N2 + 3 CO2. A balanced, but still simplified, equation is: 10 KNO3 + 3 S + 8 C → 2 K2CO3 + 3 K2SO4 + 6 CO2 + 5 N2. The exact percentages of ingredients varied greatly through the medieval period as the recipes were developed by trial and error, and needed to be updated for changing military technology. Gunpowder does not burn as a single reaction, so the byproducts are not easily predicted. One study showed that it produced (in order of descending quantities) 55.91% solid products: potassium carbonate, potassium sulfate, potassium sulfide, sulfur, potassium nitrate, potassium thiocyanate, carbon, ammonium carbonate and 42.98% gaseous products: carbon dioxide, nitrogen, carbon monoxide, hydrogen sulfide, hydrogen, methane, 1.11% water. Gunpowder made with less-expensive and more plentiful sodium nitrate instead of potassium nitrate (in appropriate proportions) works just as well. However, it is more hygroscopic than powders made from potassium nitrate. Muzzleloaders have been known to fire after hanging on a wall for decades in a loaded state, provided they remained dry. By contrast, gunpowder made with sodium nitrate must be kept sealed to remain stable. Gunpowder releases 3 megajoules per kilogram and contains its own oxidant. This is less than TNT (4.7 megajoules per kilogram), or gasoline (47.2 megajoules per kilogram in combustion, but gasoline requires an oxidant; for instance, an optimized gasoline and O2 mixture releases 10.4 megajoules per kilogram, taking into account the mass of the oxygen). Gunpowder also has a low energy density compared to modern "smokeless" powders, and thus to achieve high energy loadings, large amounts are needed with heavy projectiles.

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https://en.wikipedia.org/wiki/Bank

Bank

Capital and risk

A bank is a financial institution that accepts deposits from the public and creates a demand deposit while simultaneously making loans. Lending activities can be directly performed by the bank or indirectly through capital markets. Because banks play an important role in financial stability and the economy of a country, most jurisdictions exercise a high degree of regulation over banks. Most countries have institutionalised a system known as fractional reserve banking, under which banks hold liquid assets equal to only a portion of their current liabilities. In addition to other regulations intended to ensure liquidity, banks are generally subject to minimum capital requirements based on an international set of capital standards, the Basel Accords. Banking in its modern sense evolved in the fourteenth century in the prosperous cities of Renaissance Italy but in many ways functioned as a continuation of ideas and concepts of credit and lending that had their roots in the ancient world. In the history of banking, a number of banking dynasties notably, the Medicis, the Fuggers, the Welsers, the Berenbergs, and the Rothschilds have played a central role over many centuries. The oldest existing retail bank is Banca Monte dei Paschi di Siena (founded in 1472), while the oldest existing merchant bank is Berenberg Bank (founded in 1590).

Banks face a number of risks in order to conduct their business, and how well these risks are managed and understood is a key driver behind profitability, and how much capital a bank is required to hold. Bank capital consists principally of equity, retained earnings and subordinated debt. Some of the main risks faced by banks include: Credit risk: risk of loss arising from a borrower who does not make payments as promised. Liquidity risk: risk that a given security or asset cannot be traded quickly enough in the market to prevent a loss (or make the required profit). Market risk: risk that the value of a portfolio, either an investment portfolio or a trading portfolio, will decrease due to the change in value of the market risk factors. Operational risk: risk arising from the execution of a company's business functions. Reputational risk: a type of risk related to the trustworthiness of the business. Macroeconomic risk: risks related to the aggregate economy the bank is operating in. The capital requirement is a bank regulation, which sets a framework within which a bank or depository institution must manage its balance sheet. The categorisation of assets and capital is highly standardised so that it can be risk weighted. After the financial crisis of 2007–2008, regulators force banks to issue Contingent convertible bonds (CoCos). These are hybrid capital securities that absorb losses in accordance with their contractual terms when the capital of the issuing bank falls below a certain level. Then debt is reduced and bank capitalisation gets a boost. Owing to their capacity to absorb losses, CoCos have the potential to satisfy regulatory capital requirement.

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https://en.wikipedia.org/wiki/Hydrogen

Hydrogen

Safety and precautions

Hydrogen is the chemical element with the symbol H and atomic number 1. Hydrogen is the lightest element. At standard conditions hydrogen is a gas of diatomic molecules having the formula . It is colorless, odorless, tasteless, non-toxic, and highly combustible. Hydrogen is the most abundant chemical substance in the universe, constituting roughly 75% of all normal matter. Stars such as the Sun are mainly composed of hydrogen in the plasma state. Most of the hydrogen on Earth exists in molecular forms such as water and organic compounds. For the most common isotope of hydrogen (symbol 1H) each atom has one proton, one electron, and no neutrons. In the early universe, the formation of protons, the nuclei of hydrogen, occurred during the first second after the Big Bang. The emergence of neutral hydrogen atoms throughout the universe occurred about 370,000 years later during the recombination epoch, when the plasma had cooled enough for electrons to remain bound to protons. Hydrogen is nonmetallic, except at extremely high pressures, and readily forms a single covalent bond with most nonmetallic elements, forming compounds such as water and nearly all organic compounds. Hydrogen plays a particularly important role in acid–base reactions because these reactions usually involve the exchange of protons between soluble molecules. In ionic compounds, hydrogen can take the form of a negative charge (i.e., anion) where it is known as a hydride, or as a positively charged (i.e., cation) species denoted by the symbol . The cation is simply a proton (symbol p) but its behavior in aqueous solutions and in ionic compounds involves screening of its electric charge by nearby polar molecules or anions. Because hydrogen is the only neutral atom for which the Schrödinger equation can be solved analytically, the study of its energetics and chemical bonding has played a key role in the development of quantum mechanics. Hydrogen gas was first artificially produced in the early 16th century by the reaction of acids on metals. In 1766–1781, Henry Cavendish was the first to recognize that hydrogen gas was a discrete substance, and that it produces water when burned, the property for which it was later named: in Greek, hydrogen means "water-former". Industrial production is mainly from steam reforming of natural gas, oil reforming, or coal gasification. A small percentage is also produced using more energy-intensive methods such as the electrolysis of water. Most hydrogen is used near the site of its production, the two largest uses being fossil fuel processing (e.g., hydrocracking) and ammonia production, mostly for the fertilizer market. It can be burned to produce heat or combined with oxygen in fuel cells to generate electricity directly, with water being the only emissions at the point of usage. Hydrogen atoms (but not gaseous molecules) are problematic in metallurgy because they can embrittle many metals.

Hydrogen poses a number of hazards to human safety, from potential detonations and fires when mixed with air to being an asphyxiant in its pure, oxygen-free form. In addition, liquid hydrogen is a cryogen and presents dangers (such as frostbite) associated with very cold liquids. Hydrogen dissolves in many metals and in addition to leaking out, may have adverse effects on them, such as hydrogen embrittlement, leading to cracks and explosions. Hydrogen gas leaking into external air may spontaneously ignite. Moreover, hydrogen fire, while being extremely hot, is almost invisible, and thus can lead to accidental burns. Even interpreting the hydrogen data (including safety data) is confounded by a number of phenomena. Many physical and chemical properties of hydrogen depend on the parahydrogen/orthohydrogen ratio (it often takes days or weeks at a given temperature to reach the equilibrium ratio, for which the data is usually given). Hydrogen detonation parameters, such as critical detonation pressure and temperature, strongly depend on the container geometry.

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https://en.wikipedia.org/wiki/Henry%20Ford

Henry Ford

Early life

Henry Ford (July 30, 1863 – April 7, 1947) was an American industrialist, business magnate, founder of the Ford Motor Company, and chief developer of the assembly line technique of mass production. By creating the first automobile that middle-class Americans could afford, he converted the automobile from an expensive luxury into an accessible conveyance that profoundly impacted the landscape of the 20th century. His introduction of the Ford Model T automobile revolutionized transportation and American industry. As the Ford Motor Company owner, he became one of the richest and best-known people in the world. He is credited with "Fordism", the mass production of inexpensive goods coupled with high wages for workers. Ford had a global vision, with consumerism as the key to peace. His intense commitment to systematically lowering costs resulted in many technical and business innovations, including a franchise system that put dealerships throughout North America and major cities on six continents. Ford left most of his vast wealth to the Ford Foundation and arranged for his family to permanently control it. Ford was also widely known for his pacifism during the first years of World War I, and later for promoting antisemitic content, including The Protocols of the Elders of Zion, through his newspaper The Dearborn Independent, and the book The International Jew.

Henry Ford was born July 30, 1863, on a farm in Springwells Township, Michigan. His father, William Ford (1826–1905), was born in County Cork, Ireland, to a family that had emigrated from Somerset, England in the 16th century. His mother, Mary Ford (née Litogot; 1839–1876), was born in Michigan as the youngest child of Belgian immigrants; her parents died when she was a child and she was adopted by neighbors, the O'Herns. Henry Ford's siblings were Margaret Ford (1867–1938); Jane Ford (c. 1868–1945); William Ford (1871–1917) and Robert Ford (1873–1934). Ford finished eighth grade at a one room school, Springwells Middle School. He never attended high school; he later took a bookkeeping course at a commercial school. His father gave him a pocket watch when he was 12. At 15, Ford dismantled and reassembled the timepieces of friends and neighbors dozens of times, gaining the reputation of a watch repairman. At twenty, Ford walked four miles to their Episcopal church every Sunday. Ford was devastated when his mother died in 1876. His father expected him to take over the family farm eventually, but he despised farm work. He later wrote, "I never had any particular love for the farm—it was the mother on the farm I loved." In 1879, Ford left home to work as an apprentice machinist in Detroit, first with James F. Flower & Bros., and later with the Detroit Dry Dock Co. In 1882, he returned to Dearborn to work on the family farm, where he became adept at operating the Westinghouse portable steam engine. He was later hired by Westinghouse to service their steam engines. Ford stated two significant events occurred in 1875 when he was 12. He received the watch, and he witnessed the operation of a Nichols and Shepard road engine, "...the first vehicle other than horse-drawn that I had ever seen". In his farm workshop, Ford built a "steam wagon or tractor" and a steam car, but thought "steam was not suitable for light vehicles," as "the boiler was dangerous." Ford also said that he "did not see the use of experimenting with electricity, due to the expense of trolley wires, and "no storage battery was in sight of a weight that was practical." In 1885, Ford repaired an Otto engine, and in 1887 he built a four-cycle model with a one-inch bore and a three-inch stroke. In 1890, Ford started work on a two-cylinder engine. Ford stated, "In 1892, I completed my first motor car, powered by a two-cylinder four horsepower motor, with a two-and-half-inch bore and a six-inch stroke, which was connected to a countershaft by a belt and then to the rear wheel by a chain. The belt was shifted by a clutch lever to control speeds at 10 or 20 miles per hour, augmented by a throttle. Other features included 28-inch wire bicycle wheels with rubber tires, a foot brake, a 3-gallon gasoline tank, and later, a water jacket around the cylinders for cooling. Ford added that "in the spring of 1893 the machine was running to my partial satisfaction and giving an opportunity further to test out the design and material on the road." Between 1895 and 1896, Ford drove that machine about 1000 miles. He then started a second car in 1896, eventually building three of them in his home workshop.

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https://en.wikipedia.org/wiki/Laozi

Laozi

Names

Laozi (, ; commonly translated as "Old Master"), also rendered as Lao Tzu (), or Lao-Tze (), proper name Li Er, courtesy name Boyang, was an ancient Chinese philosopher and writer. He is the reputed author of the Tao Te Ching, the founder of philosophical Taoism, and a deity in religious Taoism and traditional Chinese religions. A semi-legendary figure, Laozi is usually portrayed as a contemporary of Confucius in the Spring and Autumn period. Some modern historians consider him to have lived during the Warring States period of the . A central figure in Chinese culture, Laozi is claimed by both the emperors of the Tang dynasty and modern people of the Li surname as a founder of their lineage. Laozi's work has been embraced by various anti-authoritarian movements, and has had a profound impact on subsequent Chinese philosophers, who have both commended and criticized his work extensively.

Laozi itself is a Chinese honorific title: (Old *rˤu ʔ, "old, venerable") and (Old *tsəʔ, "master"). In traditional accounts, Laozi'''s actual personal name is given as Er Old * nəʔ, Mod. Ěr) and his courtesy name as Boyang Old *Pˤrak-lang, Mod. Bóyáng), with his surname being Li (; Lǐ). A prominent posthumous name was Dan Dān). Sima Qian in his biography mentions his name as Lǎo Dān Lǎo Dān). The name Lǎodān also appears interchangeably with Lǎozi in early Daoist texts such as the Zhuangzi, and may also be the name by which Laozi was addressed by Confucius when they possibly met. According to the Companion Encyclopedia of Asian Philosophy, "the 'founder' of philosophical Daoism is the quasi-legendary Laodan, more commonly known as Laozi (Old Master)". The honorific title Laozi has been romanized numerous ways, sometimes leading to confusion. Increasingly common in the 21st century is Laozi, which is based on the Hanyu Pinyin system. From around the 1920s to the 1990s, Lao Tzu was the most common romanization. In the 19th century, the title was usually romanized as Lao-tse.Also encountered as Lao Tse and Lao-Tse. Other forms include the hyphenated variants Lao-tze, Lao-tsu. Historical views In the mid-twentieth century, a consensus emerged among scholars that the historicity of the person known as Laozi is doubtful and that the Tao Te Ching was "a compilation of Taoist sayings by many hands". The earliest certain reference to the present figure of Laozi is found in the Records of the Grand Historian collected by the historian Sima Qian from earlier accounts. In one account, Laozi was said to be a contemporary of Confucius during the . His personal name was Er or Dan. He was an official in the imperial archives and wrote a book in two parts before departing to the west. In another, Laozi was a different contemporary of Confucius titled Lao Laizi and wrote a book in 15 parts. In a third, he was the court astrologer Lao Dan who lived during the reign of the Duke Xian of Qin. The oldest text of the Tao Te Ching so far recovered was part of the Guodian Chu Slips. It was written on bamboo slips, and dates to the late . According to traditional accounts, Laozi was a scholar who worked as the Keeper of the Archives for the royal court of Zhou. This reportedly allowed him broad access to the works of the Yellow Emperor and other classics of the time. The stories assert that Laozi never opened a formal school but nonetheless attracted a large number of students and loyal disciples. There are many variations of a story retelling his encounter with Confucius, most famously in the Zhuangzi. He was born in a village before the Qin and Han dynasties. He was said to be the son of the Censor-in-Chief of the Zhou dynasty and Lady Yishou (益壽氏). In accounts where Laozi married, he was said to have had a son who became a celebrated soldier of Wei during the Warring States period. The story tells of Zong the Warrior who defeats an enemy and triumphs, and then abandons the corpses of the enemy soldiers to be eaten by vultures. By coincidence Laozi, traveling and teaching the way of the Tao, comes on the scene and is revealed to be the father of Zong, from whom he was separated in childhood. Laozi tells his son that it is better to treat respectfully a beaten enemy, and that the disrespect to their dead would cause his foes to seek revenge. Convinced, Zong orders his soldiers to bury the enemy dead. Funeral mourning is held for the dead of both parties and a lasting peace is made. Many clans of the Li family trace their descent to Laozi, including the emperors of the Tang dynasty. This family was known as the Longxi Li lineage (隴西李氏). According to the Simpkinses, while many (if not all) of these lineages are questionable, they provide a testament to Laozi's impact on Chinese culture. The third story in Sima Qian states that Laozi grew weary of the moral decay of life in Chengzhou and noted the kingdom's decline. He ventured west to live as a hermit in the unsettled frontier at the age of 80. At the western gate of the city (or kingdom), he was recognized by the guard Yinxi. The sentry asked the old master to record his wisdom for the good of the country before he would be permitted to pass. The text Laozi wrote was said to be the Tao Te Ching, although the present version of the text includes additions from later periods. In some versions of the tale, the sentry was so touched by the work that he became a disciple and left with Laozi, never to be seen again. In others, the "Old Master" journeyed all the way to India and was the teacher of Siddartha Gautama, the Buddha. Others say he was the Buddha himself. A seventh-century work, the Sandong Zhunang ("Pearly Bag of the Three Caverns"), embellished the relationship between Laozi and Yinxi. Laozi pretended to be a farmer when reaching the western gate, but was recognized by Yinxi, who asked to be taught by the great master. Laozi was not satisfied by simply being noticed by the guard and demanded an explanation. Yinxi expressed his deep desire to find the Tao and explained that his long study of astrology allowed him to recognize Laozi's approach. Yinxi was accepted by Laozi as a disciple. This is considered an exemplary interaction between Taoist master and disciple, reflecting the testing a seeker must undergo before being accepted. A would-be adherent is expected to prove his determination and talent, clearly expressing his wishes and showing that he had made progress on his own towards realizing the Tao. The Pearly Bag of the Three Caverns continues the parallel of an adherent's quest. Yinxi received his ordination when Laozi transmitted the Tao Te Ching, along with other texts and precepts, just as Taoist adherents receive a number of methods, teachings and scriptures at ordination. This is only an initial ordination and Yinxi still needed an additional period to perfect his virtue, thus Laozi gave him three years to perfect his Tao. Yinxi gave himself over to a full-time devotional life. After the appointed time, Yinxi again demonstrates determination and perfect trust, sending out a black sheep to market as the agreed sign. He eventually meets again with Laozi, who announces that Yinxi's immortal name is listed in the heavens and calls down a heavenly procession to clothe Yinxi in the garb of immortals. The story continues that Laozi bestowed a number of titles upon Yinxi and took him on a journey throughout the universe, even into the nine heavens. After this fantastic journey, the two sages set out to western lands of the barbarians. The training period, reuniting and travels represent the attainment of the highest religious rank in medieval Taoism called "Preceptor of the Three Caverns". In this legend, Laozi is the perfect Taoist master and Yinxi is the ideal Taoist student. Laozi is presented as the Tao personified, giving his teaching to humanity for their salvation. Yinxi follows the formal sequence of preparation, testing, training and attainment. The story of Laozi has taken on strong religious overtones since the Han dynasty. As Taoism took root, Laozi was worshipped as a god. Belief in the revelation of the Tao from the divine Laozi resulted in the formation of the Way of the Celestial Masters, the first organized religious Taoist sect. In later mature Taoist tradition, Laozi came to be seen as a personification of the Tao. He is said to have undergone numerous "transformations" and taken on various guises in various incarnations throughout history to initiate the faithful in the Way. Religious Taoism often holds that the "Old Master" did not disappear after writing the Tao Te Ching but rather spent his life traveling and revealing the Tao. Taoist myths state that Laozi was conceived when his mother gazed upon a falling star. He supposedly remained in her womb for 62 years before being born while his mother was leaning against a plum tree. (The Chinese surname Li shares its character with "plum".) Laozi was said to have emerged as a grown man with a full grey beard and long earlobes, both symbols of wisdom and long life. Other myths state that he was reborn 13 times after his first life during the days of Fuxi. In his last incarnation as Laozi, he lived nine hundred and ninety years and spent his life traveling to reveal the Tao. Tao Te Ching Laozi is traditionally regarded as the author of the Tao Te Ching (Daodejing), though the identity of its author(s) or compiler(s) has been debated throughout history. It is one of the most significant treatises in Chinese cosmogony. As with most other ancient Chinese philosophers, Laozi often explains his ideas by way of paradox, analogy, appropriation of ancient sayings, repetition, symmetry, rhyme, and rhythm. In fact, the whole book can be read as an analogy – the ruler is the awareness, or self, in meditation and the myriad creatures or empire is the experience of the body, senses and desires. The Tao Te Ching, often called simply Laozi after its reputed author, describes the Dao (or Tao) as the source and ideal of all existence: it is unseen, but not transcendent, immensely powerful yet supremely humble, being the root of all things. People have desires and free will (and thus are able to alter their own nature). Many act "unnaturally", upsetting the natural balance of the Tao. The Tao Te Ching intends to lead students to a "return" to their natural state, in harmony with Tao. Language and conventional wisdom are critically assessed. Taoism views them as inherently biased and artificial, widely using paradoxes to sharpen the point. Livia Kohn provides an example of how Laozi encouraged a change in approach, or return to "nature", rather than action. Technology may bring about a false sense of progress. The answer provided by Laozi is not the rejection of technology, but instead seeking the calm state of wu wei, free from desires. This relates to many statements by Laozi encouraging rulers to keep their people in "ignorance", or "simple-minded". Some scholars insist this explanation ignores the religious context, and others question it as an apologetic of the philosophical coherence of the text. It would not be unusual political advice if Laozi literally intended to tell rulers to keep their people ignorant. However, some terms in the text, such as "valley spirit" (gushen) and "soul" (po), bear a metaphysical context and cannot be easily reconciled with a purely ethical reading of the work.Wu wei (無為), literally "non-action" or "not acting", is a central concept of the Tao Te Ching. The concept of wu wei is multifaceted, and reflected in the words' multiple meanings, even in English translation; it can mean "not doing anything", "not forcing", "not acting" in the theatrical sense, "creating nothingness", "acting spontaneously", and "flowing with the moment". It is a concept used to explain ziran (自然), or harmony with the Tao. It includes the concepts that value distinctions are ideological and seeing ambition of all sorts as originating from the same source. Laozi used the term broadly with simplicity and humility as key virtues, often in contrast to selfish action. On a political level, it means avoiding such circumstances as war, harsh laws and heavy taxes. Some Taoists see a connection between wu wei and esoteric practices, such as zuowang "sitting in oblivion" (emptying the mind of bodily awareness and thought) found in the Zhuangzi. Taoism Laozi is traditionally regarded as the founder of Taoism, intimately connected with the Tao Te Ching and "primordial" (or "original") Taoism. Popular ("religious") Taoism typically presents the Jade Emperor as the official head deity. Intellectual ("elite") Taoists, such as the Celestial Masters sect, usually present Laozi (Laojun, "Lord Lao") and the Three Pure Ones at the top of the pantheon of deities. As a religious figure, he is worshipped under the name "Supreme Old Lord" or Taishang Laojun , Tàishàng Lǎojūn) and as one of the "Three Pure Ones". Influence Potential officials throughout Chinese history drew on the authority of non-Confucian sages, especially Laozi and Zhuangzi, to deny serving any ruler at any time. Zhuangzi, Laozi's most famous follower in traditional accounts, had a great deal of influence on Chinese literati and culture. Lao Tsu influenced millions of Chinese people by his psychological understanding. He persuaded people by his inaction and non-speaking. Political theorists influenced by Laozi have advocated humility in leadership and a restrained approach to statecraft, either for ethical and pacifist reasons, or for tactical ends. In a different context, various anti-authoritarian movements have embraced the Laozi teachings on the power of the weak. Laozi was a proponent of limited government. Left-libertarians in particular have been influenced by Laozi – in his 1937 book Nationalism and Culture, the anarcho-syndicalist writer and activist Rudolf Rocker praised Laozi's "gentle wisdom" and understanding of the opposition between political power and the cultural activities of the people and community. In his 1910 article for the Encyclopædia Britannica, Peter Kropotkin also noted that Laozi was among the earliest proponents of essentially anarchist concepts. More recently, anarchists such as John P. Clark and Ursula K. Le Guin have written about the conjunction between anarchism and Taoism in various ways, highlighting the teachings of Laozi in particular. In her rendition of the Tao Te Ching, Le Guin writes that Laozi "does not see political power as magic. He sees rightful power as earned and wrongful power as usurped... He sees sacrifice of self or others as a corruption of power, and power as available to anyone who follows the Way. No wonder anarchists and Taoists make good friends." The right-libertarian economist Murray Rothbard suggested that Laozi was the first libertarian, likening Laozi's ideas on government to Friedrich Hayek's theory of spontaneous order. James A. Dorn agreed, writing that Laozi, like many 18th-century liberals, "argued that minimizing the role of government and letting individuals develop spontaneously would best achieve social and economic harmony." Similarly, the Cato Institute's David Boaz includes passages from the Tao Te Ching' in his 1997 book The Libertarian Reader and noted in an article for the Encyclopædia Britannica that Laozi advocated for rulers to "do nothing" because "without law or compulsion, men would dwell in harmony." Philosopher Roderick Long argues that libertarian themes in Taoist thought are actually borrowed from earlier Confucian writers. Titles conferred by Tang dynasty During the Tang dynasty in 666, Emperor Gaozong honored him as "Supremely Mysterious and Primordial Emperor" . In 743, Emperor Xuanzong honored him the temple name of a Sage and granted him the posthumous title "Mysterious and Primordial Emperor" . Emperor Xuanzong also granted his parents the posthumous titles of Congenital Emperor and Congenital Empress respectively. In 749, he was honored as "Sage of Great Tao and Mysterious and Primordial Emperor" . In 754, he was given a highest honor of the "Great Sage of Highest Great Tao of the Golden Order and Mysterious and Primordial Heavenly Great Emperor" . References Citations Sources Further reading Sterckx, Roel. Ways of Heaven. An Introduction to Chinese Thought.'' New York: Basic Books, 2019.

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https://en.wikipedia.org/wiki/India

India

Etymology

India, officially the Republic of India (Hindi: ), is a country in South Asia. It is the seventh-largest country by area, the second-most populous country, and the most populous democracy in the world. Bounded by the Indian Ocean on the south, the Arabian Sea on the southwest, and the Bay of Bengal on the southeast, it shares land borders with Pakistan to the west; China, Nepal, and Bhutan to the north; and Bangladesh and Myanmar to the east. In the Indian Ocean, India is in the vicinity of Sri Lanka and the Maldives; its Andaman and Nicobar Islands share a maritime border with Thailand, Myanmar, and Indonesia. The nation's capital city is New Delhi. Modern humans arrived on the Indian subcontinent from Africa no later than 55,000 years ago. Their long occupation, initially in varying forms of isolation as hunter-gatherers, has made the region highly diverse, second only to Africa in human genetic diversity. Settled life emerged on the subcontinent in the western margins of the Indus river basin 9,000 years ago, evolving gradually into the Indus Valley Civilisation of the third millennium BCE. By , an archaic form of Sanskrit, an Indo-European language, had diffused into India from the northwest. Its evidence today is found in the hymns of the Rigveda. Preserved by a resolutely vigilant oral tradition, the Rigveda records the dawning of Hinduism in India. The Dravidian languages of India were supplanted in the northern and western regions. By , stratification and exclusion by caste had emerged within Hinduism, and Buddhism and Jainism had arisen, proclaiming social orders unlinked to heredity. Early political consolidations gave rise to the loose-knit Maurya and Gupta Empires based in the Ganges Basin. Their collective era was suffused with wide-ranging creativity, but also marked by the declining status of women, and the incorporation of untouchability into an organised system of belief. In South India, the Middle kingdoms exported Dravidian-languages scripts and religious cultures to the kingdoms of Southeast Asia. In the early medieval era, Christianity, Islam, Judaism, and Zoroastrianism became established on India's southern and western coasts. Muslim armies from Central Asia intermittently overran India's northern plains, eventually founding the Delhi Sultanate, and drawing northern India into the cosmopolitan networks of medieval Islam. In the 15th century, the Vijayanagara Empire created a long-lasting composite Hindu culture in south India. In the Punjab, Sikhism emerged, rejecting institutionalised religion. The Mughal Empire, in 1526, ushered in two centuries of relative peace, leaving a legacy of luminous architecture. Gradually expanding rule of the British East India Company followed, turning India into a colonial economy, but also consolidating its sovereignty. British Crown rule began in 1858. The rights promised to Indians were granted slowly, but technological changes were introduced, and modern ideas of education and the public life took root. A pioneering and influential nationalist movement emerged, which was noted for nonviolent resistance and became the major factor in ending British rule. In 1947 the British Indian Empire was partitioned into two independent dominions, a Hindu-majority Dominion of India and a Muslim-majority Dominion of Pakistan, amid large-scale loss of life and an unprecedented migration. India has been a federal republic since 1950, governed through a democratic parliamentary system. It is a pluralistic, multilingual and multi-ethnic society. India's population grew from 361 million in 1951 to 1.211 billion in 2011. During the same time, its nominal per capita income increased from US$64 annually to US$1,498, and its literacy rate from 16.6% to 74%. From being a comparatively destitute country in 1951, India has become a fast-growing major economy and a hub for information technology services, with an expanding middle class. It has a space programme which includes several planned or completed extraterrestrial missions. Indian movies, music, and spiritual teachings play an increasing role in global culture. India has substantially reduced its rate of poverty, though at the cost of increasing economic inequality. India is a nuclear-weapon state, which ranks high in military expenditure. It has disputes over Kashmir with its neighbours, Pakistan and China, unresolved since the mid-20th century. Among the socio-economic challenges India faces are gender inequality, child malnutrition, and rising levels of air pollution. India's land is megadiverse, with four biodiversity hotspots. Its forest cover comprises 21.7% of its area. India's wildlife, which has traditionally been viewed with tolerance in India's culture, is supported among these forests, and elsewhere, in protected habitats.

According to the Oxford English Dictionary (third edition 2009), the name "India" is derived from the Classical Latin India, a reference to South Asia and an uncertain region to its east; and in turn derived successively from: Hellenistic Greek India ( Ἰνδία); ancient Greek Indos ( Ἰνδός); Old Persian Hindush, an eastern province of the Achaemenid Empire; and ultimately its cognate, the Sanskrit Sindhu, or "river," specifically the Indus River and, by implication, its well-settled southern basin. The ancient Greeks referred to the Indians as Indoi (), which translates as "The people of the Indus". The term Bharat (; ), mentioned in both Indian epic poetry and the Constitution of India, is used in its variations by many Indian languages. A modern rendering of the historical name Bharatavarsha, which applied originally to North India, Bharat gained increased currency from the mid-19th century as a native name for India. Hindustan () is a Middle Persian name for India, introduced during the Mughal Empire and used widely since. Its meaning has varied, referring to a region encompassing present-day northern India and Pakistan or to India in its near entirety.

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https://en.wikipedia.org/wiki/Indian%20Ocean

Indian Ocean

Oceanography

The Indian Ocean is the third-largest of the world's five oceanic divisions, covering or ~19.8% of the water on Earth's surface. It is bounded by Asia to the north, Africa to the west and Australia to the east. To the south it is bounded by the Southern Ocean or Antarctica, depending on the definition in use. Along its core, the Indian Ocean has some large marginal or regional seas such as the Arabian Sea, Laccadive Sea, Somali Sea, Bay of Bengal, and Andaman Sea.

40% of the sediment of the Indian Ocean is found in the Indus and Ganges fans. The oceanic basins adjacent to the continental slopes mostly contain terrigenous sediments. The ocean south of the polar front (roughly 50° south latitude) is high in biologic productivity and dominated by non-stratified sediment composed mostly of siliceous oozes. Near the three major mid-ocean ridges the ocean floor is relatively young and therefore bare of sediment, except for the Southwest Indian Ridge due to its ultra-slow spreading rate. The ocean's currents are mainly controlled by the monsoon. Two large gyres, one in the northern hemisphere flowing clockwise and one south of the equator moving anticlockwise (including the Agulhas Current and Agulhas Return Current), constitute the dominant flow pattern. During the winter monsoon (November–February), however, circulation is reversed north of 30°S and winds are weakened during winter and the transitional periods between the monsoons. The Indian Ocean contains the largest submarine fans of the world, the Bengal Fan and Indus Fan, and the largest areas of slope terraces and rift valleys. The inflow of deep water into the Indian Ocean is 11 Sv, most of which comes from the Circumpolar Deep Water (CDW). The CDW enters the Indian Ocean through the Crozet and Madagascar basins and crosses the Southwest Indian Ridge at 30°S. In the Mascarene Basin the CDW becomes a deep western boundary current before it is met by a re-circulated branch of itself, the North Indian Deep Water. This mixed water partly flows north into the Somali Basin whilst most of it flows clockwise in the Mascarene Basin where an oscillating flow is produced by Rossby waves. Water circulation in the Indian Ocean is dominated by the Subtropical Anticyclonic Gyre, the eastern extension of which is blocked by the Southeast Indian Ridge and the 90°E Ridge. Madagascar and the Southwest Indian Ridge separate three cells south of Madagascar and off South Africa. North Atlantic Deep Water reaches into the Indian Ocean south of Africa at a depth of and flows north along the eastern continental slope of Africa. Deeper than NADW, Antarctic Bottom Water flows from Enderby Basin to Agulhas Basin across deep channels (<) in the Southwest Indian Ridge, from where it continues into the Mozambique Channel and Prince Edward Fracture Zone. North of 20° south latitude the minimum surface temperature is , exceeding to the east. Southward of 40° south latitude, temperatures drop quickly. The Bay of Bengal contributes more than half () of the runoff water to the Indian Ocean. Mainly in summer, this runoff flows into the Arabian Sea but also south across the Equator where it mixes with fresher seawater from the Indonesian Throughflow. This mixed freshwater joins the South Equatorial Current in the southern tropical Indian Ocean. Sea surface salinity is highest (more than 36 PSU) in the Arabian Sea because evaporation exceeds precipitation there. In the Southeast Arabian Sea salinity drops to less than 34 PSU. It is the lowest (c. 33 PSU) in the Bay of Bengal because of river runoff and precipitation. The Indonesian Throughflow and precipitation results in lower salinity (34 PSU) along the Sumatran west coast. Monsoonal variation results in eastward transportation of saltier water from the Arabian Sea to the Bay of Bengal from June to September and in westerly transport by the East India Coastal Current to the Arabian Sea from January to April. It is found that Arabian Sea warming is in response to the reduction in lower monsoon circulation in recent decades. An Indian Ocean garbage patch was discovered in 2010 covering at least . Riding the southern Indian Ocean Gyre, this vortex of plastic garbage constantly circulates the ocean from Australia to Africa, down the Mozambique Channel, and back to Australia in a period of six years, except for debris that gets indefinitely stuck in the centre of the gyre. The garbage patch in the Indian Ocean will, according to a 2012 study, decrease in size after several decades to vanish completely over centuries. Over several millennia, however, the global system of garbage patches will accumulate in the North Pacific. There are two amphidromes of opposite rotation in the Indian Ocean, probably caused by Rossby wave propagation. Icebergs drift as far north as 55° south latitude, similar to the Pacific but less than in the Atlantic where icebergs reach up to 45°S. The volume of iceberg loss in the Indian Ocean between 2004 and 2012 was 24 Gt. Since the 1960s, anthropogenic warming of the global ocean combined with contributions of freshwater from retreating land ice causes a global rise in sea level. Sea level also increases in the Indian Ocean, except in the south tropical Indian Ocean where it decreases, a pattern most likely caused by rising levels of greenhouse gases.

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https://en.wikipedia.org/wiki/Hindustani%20language

Hindustani language

History

Hindustani (; Devanagari: , ; Perso-Arabic: , , ) is the lingua franca of Northern & Central India and Pakistan. Hindustani is a pluricentric language with two standard registers, known as Hindi and Urdu. Thus, the language is sometimes called Hindi–Urdu. Despite these standard registers, colloquial speech in Hindustani often exists on a spectrum between these standards. Ancestors of the language were known as: Hindui, Hindavi, Zabān-e Hind (), Zabān-e Hindustan (), Hindustan ki boli (), Rekhta, and Hindi. Its regional dialects became known as Zabān-e Dakhani in southern India, Zabān-e Gujari () in Gujarat, and as Zabān-e Dehlavi or Urdu around Delhi. It is an Indo-Aryan language, deriving its base primarily from the Western Hindi dialect of Delhi, also known as Khariboli. Hindustani is a pluricentric language, best characterised as a continuum between two standardised registers: Modern Standard Hindi and Modern Standard Urdu. Depending on the social context and geographical area, the language leans towards either side. The concept of a Hindustani language as a "unifying language" or "fusion language" was endorsed by Mahatma Gandhi. The conversion from Hindi to Urdu (or vice versa) is generally achieved just by transliteration between the two scripts, instead of translation which is generally only required for religious and literary texts. Some scholars trace the language's first written poetry, in the form of Old Hindi, to as early as 769 AD. However this view is not generally accepted. During the period of the Delhi Sultanate, which covered most of today's India, eastern Pakistan, southern Nepal and Bangladesh and which resulted in the contact of Hindu and Muslim cultures, the Sanskrit and Prakrit base of Old Hindi became enriched with loanwords from Persian, evolving into the present form of Hindustani. The Hindustani vernacular became an expression of Indian national unity during the Indian Independence movement, and continues to be spoken as the common language of the people of the northern Indian subcontinent, which is reflected in the Hindustani vocabulary of Bollywood films and songs. The language's core vocabulary is derived from Prakrit (a descendant of Sanskrit), with substantial loanwords from Persian and Arabic (via Persian). Hindustani also borrowed Persian prefixes to create new words. Persian affixes became so assimilated that they were used with original Khari Boli words as well. The process of hybridization also led to the formation of words in which the first element of the compound was from Khari Boli and the second from Persian, such as rajmahal ‘palace’ (raja ‘royal, king’ + mahal ‘house, place’) and rangmahal ‘fashion house’ (rang ‘colour, dye’ + mahal ‘house, place’). As Muslim rule expanded, Hindustani speakers traveled to distant parts of India as administrators, soldiers, merchants, and artisans. As it reached new areas, Hindustani further hybridized with local languages. In the Deccan, for instance, Hindustani blended with Telugu and came to be called Dakhani. In Dakhani, aspirated consonants were replaced with their unaspirated counterparts; for instance, dekh ‘see’ became dek, ghula ‘dissolved’ became gula, kuch ‘some’ became kuc, and samajh ‘understand’ became samaj. The number of speakers can only be estimated. Ethnologue reports that, as of 2020, Hindi and Urdu together constitute the 3rd-most-spoken language in the world after English and Mandarin, with 810 million native and second-language speakers, though this includes millions who self-reported their language as 'Hindi' on the Indian census but speak a number of other Hindi languages than Hindustani. The total number of Hindi–Urdu speakers was reported to be over 300 million in 1995, making Hindustani the third- or fourth-most spoken language in the world.

Early forms of present-day Hindustani developed from the Middle Indo-Aryan apabhraṃśa vernaculars of present-day North India in the 7th–13th centuries, chiefly the Dehlavi dialect of the Western Hindi category of Indo-Aryan languages that is known as Old Hindi. Hindustani emerged as a contact language around Delhi, a result of the increasing linguistic diversity that occurred due to Muslim rule, while the use of its southern dialect, Dakhani, was promoted by Muslim rulers in the Deccan. Amir Khusrow, who lived in the thirteenth century during the Delhi Sultanate period in North India, used these forms (which was the lingua franca of the period) in his writings and referred to it as Hindavi (). The Delhi Sultanate, which comprised several Turkic and Afghan dynasties that ruled much of the subcontinent from Delhi, was succeeded by the Mughal Empire in 1526. Although the Mughals were of Timurid (Gurkānī) Turco-Mongol descent, they were Persianised, and Persian had gradually become the state language of the Mughal empire after Babur, a continuation since the introduction of Persian by Central Asian Turkic rulers in the Indian Subcontinent, and the patronisation of it by the earlier Turko-Afghan Delhi Sultanate. The basis in general for the introduction of Persian into the subcontinent was set, from its earliest days, by various Persianised Central Asian Turkic and Afghan dynasties. Hindustani began to take shape as a Persianised vernacular during the Delhi Sultanate (1206–1526 AD) and Mughal Empire (1526–1858 AD) in South Asia. Hindustani retained the grammar and core vocabulary of the local Delhi dialect. However, as an emerging common dialect, Hindustani absorbed large numbers of Persian, Arabic, and Turkic loanwords, and as Mughal conquests grew it spread as a lingua franca across much of northern India; this was a result of the contact of Hindu and Muslim cultures in Hindustan that created a composite Ganga-Jamuni tehzeeb. The language was also known as Rekhta, or 'mixed', which implies that it was mixed with Persian. Written in the Perso-Arabic, Devanagari, and occasionally Kaithi or Gurmukhi scripts, it remained the primary lingua franca of northern India for the next four centuries, although it varied significantly in vocabulary depending on the local language. Alongside Persian, it achieved the status of a literary language in Muslim courts and was also used for literary purposes in various other settings such as Sufi, Nirgun Sant, Krishna Bhakta circles, and Rajput Hindu courts. Its majors centres of development included the Mughal courts of Delhi, Lucknow, Agra and Lahore as well as the Rajput courts of Amber and Jaipur. In the 18th century, towards the end of the Mughal period, with the fragmentation of the empire and the elite system, a variant of Hindustani, one of the successors of apabhraṃśa vernaculars at Delhi, and nearby cities, came to gradually replace Persian as the lingua franca among the educated elite upper class particularly in northern India, though Persian still retained much of its pre-eminence for a short period. The term Hindustani was given to that language. The Perso-Arabic script form of this language underwent a standardisation process and further Persianisation during this period (18th century) and came to be known as Urdu, a name derived from Persian: Zabān-e Urdū-e Mualla ('language of the court') or Zabān-e Urdū (, 'language of the camp'). The etymology of the word Urdu is of Chagatai origin, Ordū ('camp'), cognate with English horde, and known in local translation as Lashkari Zabān (), which is shorted to Lashkari (). This is all due to its origin as the common speech of the Mughal army. As a literary language, Urdu took shape in courtly, elite settings. Along with English, it became the first official language of British India in 1850. Hindi as a standardised literary register of the Delhi dialect arose in the 19th century; the Braj dialect was the dominant literary language in the Devanagari script up until and through the 19th century. While the first literary works (mostly translations of earlier works) in Sanskritised Hindustani were already written in the early 19th century as part of a literary project that included both Hindu and Muslim writers (e.g. Lallu Lal, Insha Allah Khan), the call for a distinct Sanskritised standard of the Delhi dialect written in Devanagari under the name of Hindi became increasingly politicised in the course of the century and gained pace around 1880 in an effort to displace Urdu's official position. John Fletcher Hurst in his book published in 1891 mentioned that the Hindustani or camp language of the Mughal Empire's courts at Delhi was not regarded by philologists as a distinct language but only as a dialect of Hindi with admixture of Persian. He continued: "But it has all the magnitude and importance of separate language. It is linguistic result of Muslim rule of eleventh & twelfth centuries and is spoken (except in rural Bengal) by many Hindus in North India and by Musalman population in all parts of India." Next to English it was the official language of British Raj, was commonly written in Arabic or Persian characters, and was spoken by approximately 100,000,000 people. When the British colonised the Indian subcontinent from the late 18th through to the late 19th century, they used the words 'Hindustani', 'Hindi', and 'Urdu' interchangeably. They developed it as the language of administration of British India, further preparing it to be the official language of modern India and Pakistan. However, with independence, use of the word 'Hindustani' declined, being largely replaced by 'Hindi' and 'Urdu', or 'Hindi-Urdu' when either of those was too specific. More recently, the word 'Hindustani' has been used for the colloquial language of Bollywood films, which are popular in both India and Pakistan and which cannot be unambiguously identified as either Hindi or Urdu.

wit-train-topic-000710628

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https://en.wikipedia.org/wiki/Isaac%20Newton

Isaac Newton

Alchemy

Sir Isaac Newton (25 December 1642 – 20 March 1726/27) was an English mathematician, physicist, astronomer, alchemist, theologian, and author (described in his time as a "natural philosopher"), widely recognised as one of the greatest mathematicians and physicists and among the most influential scientists of all time. He was a key figure in the philosophical revolution known as the Enlightenment. His book Philosophiæ Naturalis Principia Mathematica (Mathematical Principles of Natural Philosophy), first published in 1687, established classical mechanics. Newton also made seminal contributions to optics, and shares credit with German mathematician Gottfried Wilhelm Leibniz for developing infinitesimal calculus. In the Principia, Newton formulated the laws of motion and universal gravitation that formed the dominant scientific viewpoint until it was superseded by the theory of relativity. Newton used his mathematical description of gravity to derive Kepler's laws of planetary motion, account for tides, the trajectories of comets, the precession of the equinoxes and other phenomena, eradicating doubt about the Solar System's heliocentricity. He demonstrated that the motion of objects on Earth and celestial bodies could be accounted for by the same principles. Newton's inference that the Earth is an oblate spheroid was later confirmed by the geodetic measurements of Maupertuis, La Condamine, and others, convincing most European scientists of the superiority of Newtonian mechanics over earlier systems. Newton built the first practical reflecting telescope and developed a sophisticated theory of colour based on the observation that a prism separates white light into the colours of the visible spectrum. His work on light was collected in his highly influential book Opticks, published in 1704. He also formulated an empirical law of cooling, made the first theoretical calculation of the speed of sound, and introduced the notion of a Newtonian fluid. In addition to his work on calculus, as a mathematician Newton contributed to the study of power series, generalised the binomial theorem to non-integer exponents, developed a method for approximating the roots of a function, and classified most of the cubic plane curves. Newton was a fellow of Trinity College and the second Lucasian Professor of Mathematics at the University of Cambridge. Newton was a devout but unorthodox Christian who privately rejected the doctrine of the Trinity. He refused to take holy orders in the Church of England, unlike most members of the Cambridge faculty of the day. Beyond his work on the mathematical sciences, Newton dedicated much of his time to the study of alchemy and biblical chronology, but most of his work in those areas remained unpublished until long after his death. Politically and personally tied to the Whig party, Newton served two brief terms as Member of Parliament for the University of Cambridge, in 1689–1690 and 1701–1702. He was knighted by Queen Anne in 1705 and spent the last three decades of his life in London, serving as Warden (1696–1699) and Master (1699–1727) of the Royal Mint, as well as president of the Royal Society (1703–1727).

– Preface by Albert Einstein. Reprinted by Johnson Reprint Corporation, New York (1972) Keynes took a close interest in Newton and owned many of Newton's private papers. (edited by A.H. White; originally published in 1752) Trabue, J. "Ann and Arthur Storer of Calvert County, Maryland, Friends of Sir Isaac Newton," The American Genealogist 79 (2004): 13–27.

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https://en.wikipedia.org/wiki/Iron%20Age

Iron Age

History of the concept

The Iron Age is the final epoch of the three-age division of the prehistory and protohistory of humanity. It was preceded by the Stone Age (Paleolithic, Mesolithic, Neolithic) and the Bronze Age (Chalcolithic). The concept has been mostly applied to Iron Age Europe and the Ancient Near East, but also, by analogy, to other parts of the Old World. The duration of the Iron Age varies depending on the region under consideration. It is defined by archaeological convention. The "Iron Age" begins locally when the production of iron or steel has advanced to the point where iron tools and weapons replace their bronze equivalents in common use. In the Ancient Near East, this transition took place in the wake of the so-called Bronze Age collapse, in the 12th century BCE. The technology soon spread throughout the Mediterranean Basin region and to South Asia (Iron Age in India) between the 12th and 11th century BCE. Its further spread to Central Asia, Eastern Europe, and Central Europe is somewhat delayed, and Northern Europe was not reached until around the start of the 5th century BCE. The Iron Age is taken to end, also by convention, with the beginning of the historiographical record. This usually does not represent a clear break in the archaeological record; for the Ancient Near East, the establishment of the Achaemenid Empire c. 550 BCE is traditionally and still usually taken as a cut-off date, later dates being considered historical by virtue of the record by Herodotus, despite considerable written records from far earlier (well back into the Bronze Age) now being known. In Central and Western Europe, the Roman conquests of the 1st century BC serve as marking for the end of the Iron Age. The Germanic Iron Age of Scandinavia is taken to end c. AD 800, with the beginning of the Viking Age. In the Indian sub-continent, the Iron Age is taken to begin with the ironworking Painted Gray Ware culture. Recent estimates suggest that it ranges from the 15th century BCE, through to the reign of Ashoka in the 3rd century BCE. The use of the term "Iron Age" in the archaeology of South, East, and Southeast Asia is more recent and less common than for Western Eurasia. In China, written history started before iron-working arrived, so the term is infrequently used. The Sahel (Sudan region) and Sub-Saharan Africa are outside of the three-age system, there being no Bronze Age, but the term "Iron Age" is sometimes used in reference to early cultures practicing ironworking, such as the Nok culture of Nigeria.

The three-age system was introduced in the first half of the 19th century for the archaeology of Europe in particular, and by the later 19th century expanded to the archaeology of the Ancient Near East. Its name harks back to the mythological "Ages of Man" of Hesiod. As an archaeological era, it was first introduced for Scandinavia by Christian Jürgensen Thomsen in the 1830s. By the 1860s, it was embraced as a useful division of the "earliest history of mankind" in general and began to be applied in Assyriology. The development of the now-conventional periodization in the archaeology of the Ancient Near East was developed in the 1920s to 1930s. As its name suggests, Iron Age technology is characterized by the production of tools and weaponry by ferrous metallurgy (ironworking), more specifically from carbon steel.

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https://en.wikipedia.org/wiki/Dog

Dog

Taxonomy

The dog (Canis familiaris or Canis lupus familiaris) is a domesticated descendant of the wolf. Also called the domestic dog, it is derived from the extinct Pleistocene wolf, and the modern wolf is the dog's nearest living relative. The dog was the first species to be domesticated, by hunter-gatherers over 15,000 years ago, before the development of agriculture. Due to their long association with humans, dogs have expanded to a large number of domestic individuals and gained the ability to thrive on a starch-rich diet that would be inadequate for other canids. The dog has been selectively bred over millennia for various behaviors, sensory capabilities, and physical attributes. Dog breeds vary widely in shape, size, and color. They perform many roles for humans, such as hunting, herding, pulling loads, protection, assisting police and the military, companionship, therapy, and aiding disabled people. Over the millennia, dogs became uniquely adapted to human behavior, and the human-canine bond has been a topic of frequent study. This influence on human society has given them the sobriquet of "man's best friend".

In 1758, the Swedish botanist and zoologist Carl Linnaeus published in his Systema Naturae, the two-word naming of species (binomial nomenclature). Canis is the Latin word meaning "dog", and under this genus, he listed the domestic dog, the wolf, and the golden jackal. He classified the domestic dog as Canis familiaris and, on the next page, classified the grey wolf as Canis lupus. Linnaeus considered the dog to be a separate species from the wolf because of its upturning tail (cauda recurvata), which is not found in any other canid. In 1999, a study of mitochondrial DNA (mtDNA) indicated that the domestic dog may have originated from the grey wolf, with the dingo and New Guinea singing dog breeds having developed at a time when human communities were more isolated from each other. In the third edition of Mammal Species of the World published in 2005, the mammalogist W. Christopher Wozencraft listed under the wolf Canis lupus its wild subspecies and proposed two additional subspecies, which formed the domestic dog clade: familiaris, as named by Linnaeus in 1758 and, dingo named by Meyer in 1793. Wozencraft included hallstromi (the New Guinea singing dog) as another name (junior synonym) for the dingo. Wozencraft referred to the mtDNA study as one of the guides informing his decision. Mammalogists have noted the inclusion of familiaris and dingo together under the "domestic dog" clade with some debating it. In 2019, a workshop hosted by the IUCN/Species Survival Commission's Canid Specialist Group considered the dingo and the New Guinea singing dog to be feral Canis familiaris and therefore did not assess them for the IUCN Red List of Threatened Species.

projected-04269567-016

https://en.wikipedia.org/wiki/Dog

Dog

Behavior

The dog (Canis familiaris or Canis lupus familiaris) is a domesticated descendant of the wolf. Also called the domestic dog, it is derived from the extinct Pleistocene wolf, and the modern wolf is the dog's nearest living relative. The dog was the first species to be domesticated, by hunter-gatherers over 15,000 years ago, before the development of agriculture. Due to their long association with humans, dogs have expanded to a large number of domestic individuals and gained the ability to thrive on a starch-rich diet that would be inadequate for other canids. The dog has been selectively bred over millennia for various behaviors, sensory capabilities, and physical attributes. Dog breeds vary widely in shape, size, and color. They perform many roles for humans, such as hunting, herding, pulling loads, protection, assisting police and the military, companionship, therapy, and aiding disabled people. Over the millennia, dogs became uniquely adapted to human behavior, and the human-canine bond has been a topic of frequent study. This influence on human society has given them the sobriquet of "man's best friend".

Dog behavior is the internally coordinated responses (actions or inactions) of the domestic dog (individuals or groups) to internal and external stimuli. As the oldest domesticated species, dogs' minds inevitably have been shaped by millennia of contact with humans. As a result of this physical and social evolution, dogs have acquired the ability to understand and communicate with humans more than any other species and they are uniquely attuned to human behaviors. Behavioral scientists have uncovered a surprising set of social-cognitive abilities in domestic dogs. These abilities are not possessed by the dog's closest canine relatives or other highly intelligent mammals, such as great apes, but rather parallel to children's social-cognitive skills. Unlike other domestic species selected for production-related traits, dogs were initially selected for their behaviors. In 2016, a study found that only 11 fixed genes showed variation between wolves and dogs. These gene variations were unlikely to have been the result of natural evolution and indicate selection on both morphology and behavior during dog domestication. These genes have been shown to affect the catecholamine synthesis pathway, with the majority of the genes affecting the fight-or-flight response (i.e., selection for tameness) and emotional processing. Dogs generally show reduced fear and aggression compared with wolves. Some of these genes have been associated with aggression in some dog breeds, indicating their importance in both the initial domestication and later in breed formation. Traits of high sociability and lack of fear in dogs may include genetic modifications related to Williams-Beuren syndrome in humans, which cause hypersociability at the expense of problem-solving ability.

wit-train-topic-003915434

projected-00014958-002

https://en.wikipedia.org/wiki/Immune%20system

Immune system

Surface barriers

The immune system is a network of biological processes that protects an organism from diseases. It detects and responds to a wide variety of pathogens, from viruses to parasitic worms, as well as cancer cells and objects such as wood splinters, distinguishing them from the organism's own healthy tissue. Many species have two major subsystems of the immune system. The innate immune system provides a preconfigured response to broad groups of situations and stimuli. The adaptive immune system provides a tailored response to each stimulus by learning to recognize molecules it has previously encountered. Both use molecules and cells to perform their functions. Nearly all organisms have some kind of immune system. Bacteria have a rudimentary immune system in the form of enzymes that protect against virus infections. Other basic immune mechanisms evolved in ancient plants and animals and remain in their modern descendants. These mechanisms include phagocytosis, antimicrobial peptides called defensins, and the complement system. Jawed vertebrates, including humans, have even more sophisticated defense mechanisms, including the ability to adapt to recognize pathogens more efficiently. Adaptive (or acquired) immunity creates an immunological memory leading to an enhanced response to subsequent encounters with that same pathogen. This process of acquired immunity is the basis of vaccination. Dysfunction of the immune system can cause autoimmune diseases, inflammatory diseases and cancer. Immunodeficiency occurs when the immune system is less active than normal, resulting in recurring and life-threatening infections. In humans, immunodeficiency can be the result of a genetic disease such as severe combined immunodeficiency, acquired conditions such as HIV/AIDS, or the use of immunosuppressive medication. Autoimmunity results from a hyperactive immune system attacking normal tissues as if they were foreign organisms. Common autoimmune diseases include Hashimoto's thyroiditis, rheumatoid arthritis, diabetes mellitus type 1, and systemic lupus erythematosus. Immunology covers the study of all aspects of the immune system.

Several barriers protect organisms from infection, including mechanical, chemical, and biological barriers. The waxy cuticle of most leaves, the exoskeleton of insects, the shells and membranes of externally deposited eggs, and skin are examples of mechanical barriers that are the first line of defense against infection. Organisms cannot be completely sealed from their environments, so systems act to protect body openings such as the lungs, intestines, and the genitourinary tract. In the lungs, coughing and sneezing mechanically eject pathogens and other irritants from the respiratory tract. The flushing action of tears and urine also mechanically expels pathogens, while mucus secreted by the respiratory and gastrointestinal tract serves to trap and entangle microorganisms. Chemical barriers also protect against infection. The skin and respiratory tract secrete antimicrobial peptides such as the β-defensins. Enzymes such as lysozyme and phospholipase A2 in saliva, tears, and breast milk are also antibacterials. Vaginal secretions serve as a chemical barrier following menarche, when they become slightly acidic, while semen contains defensins and zinc to kill pathogens. In the stomach, gastric acid serves as a chemical defense against ingested pathogens. Within the genitourinary and gastrointestinal tracts, commensal flora serve as biological barriers by competing with pathogenic bacteria for food and space and, in some cases, changing the conditions in their environment, such as pH or available iron. As a result, the probability that pathogens will reach sufficient numbers to cause illness is reduced.

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https://en.wikipedia.org/wiki/Inca%20Empire

Inca Empire

Etymology

The Inca Empire (also known as the Incan Empire and the Inka Empire), called Tawantinsuyu by its subjects, (Quechua for the "Realm of the Four Parts") was the largest empire in pre-Columbian America. The administrative, political and military center of the empire was in the city of Cusco. The Inca civilization arose from the Peruvian highlands sometime in the early 13th century. The Spanish began the conquest of the Inca Empire in 1532 and by 1572, the last Inca state was fully conquered. From 1438 to 1533, the Incas incorporated a large portion of western South America, centered on the Andean Mountains, using conquest and peaceful assimilation, among other methods. At its largest, the empire joined Peru, western Ecuador, western and south central Bolivia, northwest Argentina, a large portion of what is today Chile, and the southwesternmost tip of Colombia into a state comparable to the historical empires of Eurasia. Its official language was Quechua. The Inca Empire was unique in that it lacked many of the features associated with civilization in the Old World. Anthropologist Gordon McEwan wrote that the Incas were able to construct "one of the greatest imperial states in human history" without the use of the wheel, draft animals, knowledge of iron or steel, or even a system of writing. Notable features of the Inca Empire included its monumental architecture, especially stonework, extensive road network reaching all corners of the empire, finely-woven textiles, use of knotted strings () for record keeping and communication, agricultural innovations and production in a difficult environment, and the organization and management fostered or imposed on its people and their labor. The Inca Empire functioned largely without money and without markets. Instead, exchange of goods and services was based on reciprocity between individuals and among individuals, groups, and Inca rulers. "Taxes" consisted of a labour obligation of a person to the Empire. The Inca rulers (who theoretically owned all the means of production) reciprocated by granting access to land and goods and providing food and drink in celebratory feasts for their subjects. Many local forms of worship persisted in the empire, most of them concerning local sacred Huacas, but the Inca leadership encouraged the sun worship of Inti – their sun god – and imposed its sovereignty above other cults such as that of Pachamama. The Incas considered their king, the Sapa Inca, to be the "son of the sun". The Incan economy is a subject of scholarly debate. Darrell E. La Lone, in his work The Inca as a Nonmarket Economy, noted that scholars have described it as "feudal, slave, [or] socialist," as well as "a system based on reciprocity and redistribution; a system with markets and commerce; or an Asiatic mode of production."

The Inca referred to their empire as Tawantinsuyu, "the four suyu". In Quechua, tawa is four and -ntin is a suffix naming a group, so that a tawantin is a quartet, a group of four things taken together, in this case the four suyu ("regions" or "provinces") whose corners met at the capital. The four suyu were: Chinchaysuyu (north), Antisuyu (east; the Amazon jungle), Qullasuyu (south) and Kuntisuyu (west). The name Tawantinsuyu was, therefore, a descriptive term indicating a union of provinces. The Spanish transliterated the name as Tahuatinsuyo or Tahuatinsuyu. While the term Inka nowaydays is translated as "ruler" or "lord" in Quechua, this term does not simply refer to the "King" of the Tawantinsuyu or Sapa Inka but also to the Inca nobles, and some theorize its meaning could be broader. In that sense, the Inca nobles were a small percentage of the total population of the empire, probably numbering only 15,000 to 40,000, but ruling a population of around 10 million people. When the Spanish arrived to the Empire of the Incas they gave the name "Peru" to what the natives knew as Tawantinsuyu. The name "Inca Empire" (Imperio de los Incas) originated from the Chronicles of the 16th Century.

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https://en.wikipedia.org/wiki/Play%20%28activity%29

Play (activity)

Definitions

Play is a range of intrinsically motivated activities done for recreational pleasure and enjoyment. Play is commonly associated with children and juvenile-level activities, but may be engaged in at any life stage, and among other higher-functioning animals as well, most notably mammals and birds. Many prominent researchers in the field of psychology, including Melanie Klein, Jean Piaget, William James, Sigmund Freud, Carl Jung and Lev Vygotsky have erroneously viewed play as confined to the human species, believing play was important for human development and using different research methods to prove their theories. Play is often interpreted as frivolous; yet the player can be intently focused on their objective, particularly when play is structured and goal-oriented, as in a game. Accordingly, play can range from relaxed, free-spirited and spontaneous through frivolous to planned or even compulsive. Play is not just a pastime activity; it has the potential to serve as an important tool in numerous aspects of daily life for adolescents, adults, and cognitively advanced non-human species (such as primates). Not only does play promote and aid in physical development (such as hand-eye coordination), but it also aids in cognitive development and social skills, and can even act as a stepping stone into the world of integration, which can be a very stressful process. Play is something that most children partake in, but the way play is executed is different between cultures and the way that children engage with play varies universally.

The seminal text in the field of play studies is the book Homo Ludens first published in 1944 with several subsequent editions, in which Johan Huizinga defines play as follows: This definition of play as constituting a separate and independent sphere of human activity is sometimes referred to as the "magic circle" notion of play, a phrase also attributed to Huizinga. Many other definitions exist. Jean Piaget stated, "the many theories of play expounded in the past are clear proof that the phenomenon is difficult to understand." There are multiple aspects of play people home in on when defining it. One definition from Susanna Millar's The Psychology of Play defines play as: “any purposeful mental or physical activity performed either individually or group-wise in leisure time or at work for enjoyment, relaxation, and satisfaction of real-time or long term needs.” This definition particularly emphasizes the conditions and benefits to be gained under certain actions or activities related to play. Other definitions may focus on play as an activity that must follow certain characteristics including willingness to engage, uncertainty of the outcome, and productivity of the activity to society. Another definition of play from the twenty-first century comes from the National Playing Fields Association (NPFA). The definition reads as follows: “play is freely chosen, personally directed, intrinsically motivated behaviour that actively engages the child.” This definition focuses more on the child's freedom of choice and personal motivation related to an activity.

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https://en.wikipedia.org/wiki/Medication

Medication

Classification

A medication (also called medicament, medicine, pharmaceutical drug, medicinal drug or simply drug) is a drug used to diagnose, cure, treat, or prevent disease. Drug therapy (pharmacotherapy) is an important part of the medical field and relies on the science of pharmacology for continual advancement and on pharmacy for appropriate management. Drugs are classified in multiple ways. One of the key divisions is by level of control, which distinguishes prescription drugs (those that a pharmacist dispenses only on the order of a physician, physician assistant, or qualified nurse) from over-the-counter drugs (those that consumers can order for themselves). Another key distinction is between traditional small-molecule drugs, usually derived from chemical synthesis, and biopharmaceuticals, which include recombinant proteins, vaccines, blood products used therapeutically (such as IVIG), gene therapy, monoclonal antibodies and cell therapy (for instance, stem-cell therapies). Other ways to classify medicines are by mode of action, route of administration, biological system affected, or therapeutic effects. An elaborate and widely used classification system is the Anatomical Therapeutic Chemical Classification System (ATC system). The World Health Organization keeps a list of essential medicines. Drug discovery and drug development are complex and expensive endeavors undertaken by pharmaceutical companies, academic scientists, and governments. As a result of this complex path from discovery to commercialization, partnering has become a standard practice for advancing drug candidates through development pipelines. Governments generally regulate what drugs can be marketed, how drugs are marketed, and in some jurisdictions, drug pricing. Controversies have arisen over drug pricing and disposal of used drugs.

One of the key classifications is between traditional small molecule drugs; usually derived from chemical synthesis, and biologic medical products; which include recombinant proteins, vaccines, blood products used therapeutically (such as IVIG), gene therapy, and cell therapy (for instance, stem cell therapies). Pharmaceuticals or drugs or medicines are classified in various other groups besides their origin on the basis of pharmacological properties like mode of action and their pharmacological action or activity, such as by chemical properties, mode or route of administration, biological system affected, or therapeutic effects. An elaborate and widely used classification system is the Anatomical Therapeutic Chemical Classification System (ATC system). The World Health Organization keeps a list of essential medicines. A sampling of classes of medicine includes: Antipyretics: reducing fever (pyrexia/pyresis) Analgesics: reducing pain (painkillers) Antimalarial drugs: treating malaria Antibiotics: inhibiting germ growth Antiseptics: prevention of germ growth near burns, cuts and wounds Mood stabilizers: lithium and valproate Hormone replacements: Premarin Oral contraceptives: Enovid, "biphasic" pill, and "triphasic" pill Stimulants: methylphenidate, amphetamine Tranquilizers: meprobamate, chlorpromazine, reserpine, chlordiazepoxide, diazepam, and alprazolam Statins: lovastatin, pravastatin, and simvastatin Pharmaceuticals may also be described as "specialty", independent of other classifications, which is an ill-defined class of drugs that might be difficult to administer, require special handling during administration, require patient monitoring during and immediately after administration, have particular regulatory requirements restricting their use, and are generally expensive relative to other drugs.

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https://en.wikipedia.org/wiki/Bacteria

Bacteria

Habitat

Bacteria (; singular: bacterium) are ubiquitous, mostly free-living organisms often consisting of one biological cell. They constitute a large domain of prokaryotic microorganisms. Typically a few micrometres in length, bacteria were among the first life forms to appear on Earth, and are present in most of its habitats. Bacteria inhabit soil, water, acidic hot springs, radioactive waste, and the deep biosphere of Earth's crust. Bacteria are vital in many stages of the nutrient cycle by recycling nutrients such as the fixation of nitrogen from the atmosphere. The nutrient cycle includes the decomposition of dead bodies; bacteria are responsible for the putrefaction stage in this process. In the biological communities surrounding hydrothermal vents and cold seeps, extremophile bacteria provide the nutrients needed to sustain life by converting dissolved compounds, such as hydrogen sulphide and methane, to energy. Bacteria also live in symbiotic and parasitic relationships with plants and animals. Most bacteria have not been characterised and there are many species that cannot be grown in the laboratory. The study of bacteria is known as bacteriology, a branch of microbiology. Humans and most other animals carry millions of bacteria. Most are in the gut, and there are many on the skin. Most of the bacteria in and on the body are harmless or rendered so by the protective effects of the immune system, and many are beneficial, particularly the ones in the gut. However, several species of bacteria are pathogenic and cause infectious diseases, including cholera, syphilis, anthrax, leprosy, tuberculosis, tetanus and bubonic plague. The most common fatal bacterial diseases are respiratory infections. Antibiotics are used to treat bacterial infections and are also used in farming, making antibiotic resistance a growing problem. Bacteria are important in sewage treatment and the breakdown of oil spills, the production of cheese and yogurt through fermentation, the recovery of gold, palladium, copper and other metals in the mining sector, as well as in biotechnology, and the manufacture of antibiotics and other chemicals. Once regarded as plants constituting the class Schizomycetes ("fission fungi"), bacteria are now classified as prokaryotes. Unlike cells of animals and other eukaryotes, bacterial cells do not contain a nucleus and rarely harbour membrane-bound organelles. Although the term bacteria traditionally included all prokaryotes, the scientific classification changed after the discovery in the 1990s that prokaryotes consist of two very different groups of organisms that evolved from an ancient common ancestor. These evolutionary domains are called Bacteria and Archaea.

Bacteria are ubiquitous, living in every possible habitat on the planet including soil, underwater, deep in Earth's crust and even such extreme environments as acidic hot springs and radioactive waste. There are approximately 2×1030 bacteria on Earth, forming a biomass that is only exceeded by plants. They are abundant in lakes and oceans, in arctic ice, and geothermal springs where they provide the nutrients needed to sustain life by converting dissolved compounds, such as hydrogen sulphide and methane, to energy. They live on and in plants and animals. Most do not cause diseases, are beneficial to their environments, and are essential for life. The soil is a rich source of bacteria and a few grams contain around a thousand million of them. They are all essential to soil ecology, breaking down toxic waste and recycling nutrients. They are even found in the atmosphere and one cubic metre of air holds around one hundred million bacterial cells. The oceans and seas harbour around 3 x 1026 bacteria which provide up to 50% of the oxygen humans breathe. Only around 2% of bacterial species have been fully studied.

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https://en.wikipedia.org/wiki/Bacteria

Bacteria

Metabolism

Bacteria (; singular: bacterium) are ubiquitous, mostly free-living organisms often consisting of one biological cell. They constitute a large domain of prokaryotic microorganisms. Typically a few micrometres in length, bacteria were among the first life forms to appear on Earth, and are present in most of its habitats. Bacteria inhabit soil, water, acidic hot springs, radioactive waste, and the deep biosphere of Earth's crust. Bacteria are vital in many stages of the nutrient cycle by recycling nutrients such as the fixation of nitrogen from the atmosphere. The nutrient cycle includes the decomposition of dead bodies; bacteria are responsible for the putrefaction stage in this process. In the biological communities surrounding hydrothermal vents and cold seeps, extremophile bacteria provide the nutrients needed to sustain life by converting dissolved compounds, such as hydrogen sulphide and methane, to energy. Bacteria also live in symbiotic and parasitic relationships with plants and animals. Most bacteria have not been characterised and there are many species that cannot be grown in the laboratory. The study of bacteria is known as bacteriology, a branch of microbiology. Humans and most other animals carry millions of bacteria. Most are in the gut, and there are many on the skin. Most of the bacteria in and on the body are harmless or rendered so by the protective effects of the immune system, and many are beneficial, particularly the ones in the gut. However, several species of bacteria are pathogenic and cause infectious diseases, including cholera, syphilis, anthrax, leprosy, tuberculosis, tetanus and bubonic plague. The most common fatal bacterial diseases are respiratory infections. Antibiotics are used to treat bacterial infections and are also used in farming, making antibiotic resistance a growing problem. Bacteria are important in sewage treatment and the breakdown of oil spills, the production of cheese and yogurt through fermentation, the recovery of gold, palladium, copper and other metals in the mining sector, as well as in biotechnology, and the manufacture of antibiotics and other chemicals. Once regarded as plants constituting the class Schizomycetes ("fission fungi"), bacteria are now classified as prokaryotes. Unlike cells of animals and other eukaryotes, bacterial cells do not contain a nucleus and rarely harbour membrane-bound organelles. Although the term bacteria traditionally included all prokaryotes, the scientific classification changed after the discovery in the 1990s that prokaryotes consist of two very different groups of organisms that evolved from an ancient common ancestor. These evolutionary domains are called Bacteria and Archaea.

Bacteria exhibit an extremely wide variety of metabolic types. The distribution of metabolic traits within a group of bacteria has traditionally been used to define their taxonomy, but these traits often do not correspond with modern genetic classifications. Bacterial metabolism is classified into nutritional groups on the basis of three major criteria: the source of energy, the electron donors used, and the source of carbon used for growth. Bacteria either derive energy from light using photosynthesis (called phototrophy), or by breaking down chemical compounds using oxidation (called chemotrophy). Chemotrophs use chemical compounds as a source of energy by transferring electrons from a given electron donor to a terminal electron acceptor in a redox reaction. This reaction releases energy that can be used to drive metabolism. Chemotrophs are further divided by the types of compounds they use to transfer electrons. Bacteria that use inorganic compounds such as hydrogen, carbon monoxide, or ammonia as sources of electrons are called lithotrophs, while those that use organic compounds are called organotrophs. The compounds used to receive electrons are also used to classify bacteria: aerobic organisms use oxygen as the terminal electron acceptor, while anaerobic organisms use other compounds such as nitrate, sulfate, or carbon dioxide. Many bacteria get their carbon from other organic carbon, called heterotrophy. Others such as cyanobacteria and some purple bacteria are autotrophic, meaning that they obtain cellular carbon by fixing carbon dioxide. In unusual circumstances, the gas methane can be used by methanotrophic bacteria as both a source of electrons and a substrate for carbon anabolism. In many ways, bacterial metabolism provides traits that are useful for ecological stability and for human society. One example is that some bacteria called diazotrophs have the ability to fix nitrogen gas using the enzyme nitrogenase. This environmentally important trait can be found in bacteria of most metabolic types listed above. This leads to the ecologically important processes of denitrification, sulfate reduction, and acetogenesis, respectively. Bacterial metabolic processes are also important in biological responses to pollution; for example, sulfate-reducing bacteria are largely responsible for the production of the highly toxic forms of mercury (methyl- and dimethylmercury) in the environment. Non-respiratory anaerobes use fermentation to generate energy and reducing power, secreting metabolic by-products (such as ethanol in brewing) as waste. Facultative anaerobes can switch between fermentation and different terminal electron acceptors depending on the environmental conditions in which they find themselves.

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https://en.wikipedia.org/wiki/Library

Library

Etymology

A library is a collection of materials, books or media that are accessible for use and not just for display purposes. A library provides physical (hard copies) or digital access (soft copies) materials, and may be a physical location or a virtual space, or both. A library's collection can include printed materials and other physical resources in many formats such as DVD, CD and cassette as well as access to information, music or other content held on bibliographic databases. A library, which may vary widely in size, may be organized for use and maintained by a public body such as a government; an institution such as a school or museum; a corporation; or a private individual. In addition to providing materials, libraries also provide the services of librarians who are trained and experts at finding, selecting, circulating and organizing information and at interpreting information needs, navigating and analyzing very large amounts of information with a variety of resources. Library buildings often provide quiet areas for studying, as well as common areas for group study and collaboration, and may provide public facilities for access to their electronic resources; for instance: computers and access to the Internet. The library's clientele and services offered vary depending on its type: users of a public library have different needs from those of a special library or academic library, for example. Libraries may also be community hubs, where programs are delivered and people engage in lifelong learning. Modern libraries extend their services beyond the physical walls of a building by providing material accessible by electronic means, including from home via the Internet. The services the library offers are variously described as library services, information services, or the combination "library and information services", although different institutions and sources define such terminology differently.

The term library is based on the Latin word for 'book' or 'document', contained in Latin 'collection of books' and 'container for books'. Other modern languages use derivations from Ancient Greek (), originally meaning 'book container', via Latin (cf. French or German ).

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https://en.wikipedia.org/wiki/Latin

Latin

Grammar

Latin (, or , ) is a classical language belonging to the Italic branch of the Indo-European languages. Latin was originally a dialect spoken in the lower Tiber area (then known as Latium) around present-day Rome, but through the power of the Roman Republic it became the dominant language in the Italian region and subsequently throughout the Roman Empire. Even after the fall of Western Rome, Latin remained the common language of international communication, science, scholarship and academia in Europe until well into the 18th century, when other regional vernaculars (including its own descendants, the Romance languages) supplanted it in common academic and political usage, and it eventually became a dead language in the modern linguistic definition. Latin is a highly inflected language, with three distinct genders, six or seven noun cases, five declensions, four verb conjugations, six tenses, three persons, three moods, two voices, two or three aspects, and two numbers. The Latin alphabet is directly derived from the Etruscan and Greek alphabets. By the late Roman Republic (75 BC), Old Latin had been standardised into Classical Latin used by educated elites. Vulgar Latin was the colloquial form spoken at that time among lower-class commoners and attested in inscriptions and the works of comic playwrights Plautus and Terence and author Petronius. Late Latin is the written language from the 3rd century and its various Vulgar Latin dialects developed in the 6th to 9th centuries into the modern Romance languages. Medieval Latin was used during the Middle Ages as a literary language from the 9th century to the Renaissance, which then used Renaissance Latin. Later, New Latin evolved during the early modern era to eventually become various forms of rarely spoken Contemporary Latin, one of which, Ecclesiastical Latin, remains the official language of the Holy See and the Roman Rite of the Catholic Church at Vatican City. Latin has also greatly influenced the English language and historically contributed many words to the English lexicon after the Christianization of Anglo-Saxons and the Norman conquest. In particular, Latin (and Ancient Greek) roots are still used in English descriptions of theology, science disciplines (especially anatomy and taxonomy), medicine, and law.

Latin is a synthetic, fusional language in the terminology of linguistic typology. In more traditional terminology, it is an inflected language, but typologists are apt to say "inflecting". Words include an objective semantic element and markers specifying the grammatical use of the word. The fusion of root meaning and markers produces very compact sentence elements: , "I love," is produced from a semantic element, , "love," to which , a first person singular marker, is suffixed. The grammatical function can be changed by changing the markers: the word is "inflected" to express different grammatical functions, but the semantic element usually does not change. (Inflection uses affixing and infixing. Affixing is prefixing and suffixing. Latin inflections are never prefixed.) For example, , "he (or she or it) will love", is formed from the same stem, , to which a future tense marker, , is suffixed, and a third person singular marker, , is suffixed. There is an inherent ambiguity: may denote more than one grammatical category: masculine, feminine, or neuter gender. A major task in understanding Latin phrases and clauses is to clarify such ambiguities by an analysis of context. All natural languages contain ambiguities of one sort or another. The inflections express gender, number, and case in adjectives, nouns, and pronouns, a process called declension. Markers are also attached to fixed stems of verbs, to denote person, number, tense, voice, mood, and aspect, a process called conjugation. Some words are uninflected and undergo neither process, such as adverbs, prepositions, and interjections.

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https://en.wikipedia.org/wiki/Logarithm

Logarithm

History

In mathematics, the logarithm is the inverse function to exponentiation. That means the logarithm of a number  to the base  is the exponent to which must be raised, to produce . For example, since , the logarithm base 10 of is , or . The logarithm of to base  is denoted as , or without parentheses, , or even without the explicit base, , when no confusion is possible, or when the base does not matter such as in big O notation. The logarithm base is called the decimal or common logarithm and is commonly used in science and engineering. The natural logarithm has the number  as its base; its use is widespread in mathematics and physics, because of its very simple derivative. The binary logarithm uses base and is frequently used in computer science. Logarithms were introduced by John Napier in 1614 as a means of simplifying calculations. They were rapidly adopted by navigators, scientists, engineers, surveyors and others to perform high-accuracy computations more easily. Using logarithm tables, tedious multi-digit multiplication steps can be replaced by table look-ups and simpler addition. This is possible because the logarithm of a product is the sum of the logarithms of the factors: provided that , and are all positive and . The slide rule, also based on logarithms, allows quick calculations without tables, but at lower precision. The present-day notion of logarithms comes from Leonhard Euler, who connected them to the exponential function in the 18th century, and who also introduced the letter as the base of natural logarithms. Logarithmic scales reduce wide-ranging quantities to smaller scopes. For example, the decibel (dB) is a unit used to express ratio as logarithms, mostly for signal power and amplitude (of which sound pressure is a common example). In chemistry, pH is a logarithmic measure for the acidity of an aqueous solution. Logarithms are commonplace in scientific formulae, and in measurements of the complexity of algorithms and of geometric objects called fractals. They help to describe frequency ratios of musical intervals, appear in formulas counting prime numbers or approximating factorials, inform some models in psychophysics, and can aid in forensic accounting. The concept of logarithm as the inverse of exponentiation extends to other mathematical structures as well. However, in general settings, the logarithm tends to be a multi-valued function. For example, the complex logarithm is the multi-valued inverse of the complex exponential function. Similarly, the discrete logarithm is the multi-valued inverse of the exponential function in finite groups; it has uses in public-key cryptography.

The history of logarithms in seventeenth-century Europe is the discovery of a new function that extended the realm of analysis beyond the scope of algebraic methods. The method of logarithms was publicly propounded by John Napier in 1614, in a book titled Mirifici Logarithmorum Canonis Descriptio (Description of the Wonderful Rule of Logarithms). Prior to Napier's invention, there had been other techniques of similar scopes, such as the prosthaphaeresis or the use of tables of progressions, extensively developed by Jost Bürgi around 1600. Napier coined the term for logarithm in Middle Latin, “logarithmus,” derived from the Greek, literally meaning, “ratio-number,” from logos “proportion, ratio, word” + arithmos “number”. The common logarithm of a number is the index of that power of ten which equals the number. Speaking of a number as requiring so many figures is a rough allusion to common logarithm, and was referred to by Archimedes as the “order of a number”. The first real logarithms were heuristic methods to turn multiplication into addition, thus facilitating rapid computation. Some of these methods used tables derived from trigonometric identities. Such methods are called prosthaphaeresis. Invention of the function now known as the natural logarithm began as an attempt to perform a quadrature of a rectangular hyperbola by Grégoire de Saint-Vincent, a Belgian Jesuit residing in Prague. Archimedes had written The Quadrature of the Parabola in the third century BC, but a quadrature for the hyperbola eluded all efforts until Saint-Vincent published his results in 1647. The relation that the logarithm provides between a geometric progression in its argument and an arithmetic progression of values, prompted A. A. de Sarasa to make the connection of Saint-Vincent's quadrature and the tradition of logarithms in prosthaphaeresis, leading to the term “hyperbolic logarithm”, a synonym for natural logarithm. Soon the new function was appreciated by Christiaan Huygens, and James Gregory. The notation Log y was adopted by Leibniz in 1675, and the next year he connected it to the integral Before Euler developed his modern conception of complex natural logarithms, Roger Cotes had a nearly equivalent result when he showed in 1714 that .

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https://en.wikipedia.org/wiki/Lipid

Lipid

Metabolism

Lipids are a broad group of naturally-occurring molecules which includes fats, waxes, sterols, fat-soluble vitamins (such as vitamins A, D, E and K), monoglycerides, diglycerides, phospholipids, and others. The functions of lipids include storing energy, signaling, and acting as structural components of cell membranes. Lipids have applications in the cosmetic and food industries, and in nanotechnology. Lipids may be broadly defined as hydrophobic or amphiphilic small molecules; the amphiphilic nature of some lipids allows them to form structures such as vesicles, multilamellar/unilamellar liposomes, or membranes in an aqueous environment. Biological lipids originate entirely or in part from two distinct types of biochemical subunits or "building-blocks": ketoacyl and isoprene groups. Using this approach, lipids may be divided into eight categories: fatty acyls, glycerolipids, glycerophospholipids, sphingolipids, saccharolipids, and polyketides (derived from condensation of ketoacyl subunits); and sterol lipids and prenol lipids (derived from condensation of isoprene subunits). Although the term "lipid" is sometimes used as a synonym for fats, fats are a subgroup of lipids called triglycerides. Lipids also encompass molecules such as fatty acids and their derivatives (including tri-, di-, monoglycerides, and phospholipids), as well as other sterol-containing metabolites such as cholesterol. Although humans and other mammals use various biosynthetic pathways both to break down and to synthesize lipids, some essential lipids can't be made this way and must be obtained from the diet.

The major dietary lipids for humans and other animals are animal and plant triglycerides, sterols, and membrane phospholipids. The process of lipid metabolism synthesizes and degrades the lipid stores and produces the structural and functional lipids characteristic of individual tissues.

projected-19572217-016

https://en.wikipedia.org/wiki/Influenza

Influenza

Treatment

Influenza, commonly known as "the flu", is an infectious disease caused by influenza viruses. Symptoms range from mild to severe and often include fever, runny nose, sore throat, muscle pain, headache, coughing, and fatigue. These symptoms begin from one to four days after exposure to the virus (typically two days) and last for about 2–8 days. Diarrhea and vomiting can occur, particularly in children. Influenza may progress to pneumonia, which can be caused by the virus or by a subsequent bacterial infection. Other complications of infection include acute respiratory distress syndrome, meningitis, encephalitis, and worsening of pre-existing health problems such as asthma and cardiovascular disease. There are four types of influenza virus, termed influenza viruses A, B, C, and D. Aquatic birds are the primary source of Influenza A virus (IAV), which is also widespread in various mammals, including humans and pigs. Influenza B virus (IBV) and Influenza C virus (ICV) primarily infect humans, and Influenza D virus (IDV) is found in cattle and pigs. IAV and IBV circulate in humans and cause seasonal epidemics, and ICV causes a mild infection, primarily in children. IDV can infect humans but is not known to cause illness. In humans, influenza viruses are primarily transmitted through respiratory droplets produced from coughing and sneezing. Transmission through aerosols and intermediate objects and surfaces contaminated by the virus also occur. Frequent hand washing and covering one's mouth and nose when coughing and sneezing reduce transmission. Annual vaccination can help to provide protection against influenza. Influenza viruses, particularly IAV, evolve quickly, so flu vaccines are updated regularly to match which influenza strains are in circulation. Vaccines currently in use provide protection against IAV subtypes H1N1 and H3N2 and one or two IBV subtypes. Influenza infection is diagnosed with laboratory methods such as antibody or antigen tests and a polymerase chain reaction (PCR) to identify viral nucleic acid. The disease can be treated with supportive measures and, in severe cases, with antiviral drugs such as oseltamivir. In healthy individuals, influenza is typically self-limiting and rarely fatal, but it can be deadly in high-risk groups. In a typical year, 5–15% of the population contracts influenza. There are 3–5 million severe cases annually, with up to 650,000 respiratory-related deaths globally each year. Deaths most commonly occur in high-risk groups, including young children, the elderly, and people with chronic health conditions. In temperate regions of the world, the number of influenza cases peaks during winter, whereas in the tropics influenza can occur year-round. Since the late 1800s, large outbreaks of novel influenza strains that spread globally, called pandemics, have occurred every 10–50 years. Five flu pandemics have occurred since 1900: the Spanish flu in 1918–1920, which was the most severe flu pandemic, the Asian flu in 1957, the Hong Kong flu in 1968, the Russian flu in 1977, and the swine flu pandemic in 2009.

Treatment of influenza in cases of mild or moderate illness is supportive and includes anti-fever medications such as acetaminophen and ibuprofen, adequate fluid intake to avoid dehydration, and resting at home. Cough drops and throat sprays may be beneficial for sore throat. It is recommended to avoid alcohol and tobacco use while sick with the flu. Aspirin is not recommended to treat influenza in children due to an elevated risk of developing Reye syndrome. Corticosteroids likewise are not recommended except when treating septic shock or an underlying medical condition, such as chronic obstructive pulmonary disease or asthma exacerbation, since they are associated with increased mortality. If a secondary bacterial infection occurs, then treatment with antibiotics may be necessary.

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https://en.wikipedia.org/wiki/Influenza

Influenza

Prognosis

Influenza, commonly known as "the flu", is an infectious disease caused by influenza viruses. Symptoms range from mild to severe and often include fever, runny nose, sore throat, muscle pain, headache, coughing, and fatigue. These symptoms begin from one to four days after exposure to the virus (typically two days) and last for about 2–8 days. Diarrhea and vomiting can occur, particularly in children. Influenza may progress to pneumonia, which can be caused by the virus or by a subsequent bacterial infection. Other complications of infection include acute respiratory distress syndrome, meningitis, encephalitis, and worsening of pre-existing health problems such as asthma and cardiovascular disease. There are four types of influenza virus, termed influenza viruses A, B, C, and D. Aquatic birds are the primary source of Influenza A virus (IAV), which is also widespread in various mammals, including humans and pigs. Influenza B virus (IBV) and Influenza C virus (ICV) primarily infect humans, and Influenza D virus (IDV) is found in cattle and pigs. IAV and IBV circulate in humans and cause seasonal epidemics, and ICV causes a mild infection, primarily in children. IDV can infect humans but is not known to cause illness. In humans, influenza viruses are primarily transmitted through respiratory droplets produced from coughing and sneezing. Transmission through aerosols and intermediate objects and surfaces contaminated by the virus also occur. Frequent hand washing and covering one's mouth and nose when coughing and sneezing reduce transmission. Annual vaccination can help to provide protection against influenza. Influenza viruses, particularly IAV, evolve quickly, so flu vaccines are updated regularly to match which influenza strains are in circulation. Vaccines currently in use provide protection against IAV subtypes H1N1 and H3N2 and one or two IBV subtypes. Influenza infection is diagnosed with laboratory methods such as antibody or antigen tests and a polymerase chain reaction (PCR) to identify viral nucleic acid. The disease can be treated with supportive measures and, in severe cases, with antiviral drugs such as oseltamivir. In healthy individuals, influenza is typically self-limiting and rarely fatal, but it can be deadly in high-risk groups. In a typical year, 5–15% of the population contracts influenza. There are 3–5 million severe cases annually, with up to 650,000 respiratory-related deaths globally each year. Deaths most commonly occur in high-risk groups, including young children, the elderly, and people with chronic health conditions. In temperate regions of the world, the number of influenza cases peaks during winter, whereas in the tropics influenza can occur year-round. Since the late 1800s, large outbreaks of novel influenza strains that spread globally, called pandemics, have occurred every 10–50 years. Five flu pandemics have occurred since 1900: the Spanish flu in 1918–1920, which was the most severe flu pandemic, the Asian flu in 1957, the Hong Kong flu in 1968, the Russian flu in 1977, and the swine flu pandemic in 2009.

In healthy individuals, influenza infection is usually self-limiting and rarely fatal. Symptoms usually last for 2–8 days. Influenza can cause people to miss work or school, and it is associated with decreased job performance and, in older adults, reduced independence. Fatigue and malaise may last for several weeks after recovery, and healthy adults may experience pulmonary abnormalities that can take several weeks to resolve. Complications and mortality primarily occur in high-risk populations and those who are hospitalized. Severe disease and mortality are usually attributable to pneumonia from the primary viral infection or a secondary bacterial infection, which can progress to ARDS. Other respiratory complications that may occur include sinusitis, bronchitis, bronchiolitis, excess fluid buildup in the lungs, and exacerbation of chronic bronchitis and asthma. Middle ear infection and croup may occur, most commonly in children. Secondary S. aureus infection has been observed, primarily in children, to cause toxic shock syndrome after influenza, with hypotension, fever, and reddening and peeling of the skin. Complications affecting the cardiovascular system are rare and include pericarditis, fulminant myocarditis with a fast, slow, or irregular heartbeat, and exacerbation of pre-existing cardiovascular disease. Inflammation or swelling of muscles accompanied by muscle tissue breaking down occurs rarely, usually in children, which presents as extreme tenderness and muscle pain in the legs and a reluctance to walk for 2–3 days. Influenza can affect pregnancy, including causing smaller neonatal size, increased risk of premature birth, and an increased risk of child death shortly before or after birth. Neurological complications have been associated with influenza on rare occasions, including aseptic meningitis, encephalitis, disseminated encephalomyelitis, transverse myelitis, and Guillain–Barré syndrome. Additionally, febrile seizures and Reye syndrome can occur, most commonly in children. Influenza-associated encephalopathy can occur directly from central nervous system infection from the presence of the virus in blood and presents as suddent onset of fever with convulsions, followed by rapid progression to coma. An atypical form of encephalitis called encephalitis lethargica, characterized by headache, drowsiness, and coma, may rarely occur sometime after infection. In survivors of influenza-associated encephalopathy, neurological defects may occur. Primarily in children, in severe cases the immune system may rarely dramatically overproduce white blood cells that release cytokines, causing severe inflammation. People who are at least 65 years of age, due to a weakened immune system from aging or a chronic illness, are a high-risk group for developing complications, as are children less than one year of age and children who have not been previously exposed to influenza viruses multiple times. Pregnant women are at an elevated risk, which increases by trimester and lasts up to two weeks after childbirth. Obesity, in particular a body mass index greater than 35–40, is associated with greater amounts of viral replication, increased severity of secondary bacterial infection, and reduced vaccination efficacy. People who have underlying health conditions are also considered at-risk, including those who have congenital or chronic heart problems or lung (e.g. asthma), kidney, liver, blood, neurological, or metabolic (e.g. diabetes) disorders, as are people who are immunocompromised from chemotherapy, asplenia, prolonged steroid treatment, splenic dysfunction, or HIV infection. Current or past tobacco use also places a person at risk. The role of genetics in influenza is not well researched, but it may be a factor in influenza mortality.

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https://en.wikipedia.org/wiki/Electric%20motor

Electric motor

Types

An electric motor is an electrical machine that converts electrical energy into mechanical energy. Most electric motors operate through the interaction between the motor's magnetic field and electric current in a wire winding to generate force in the form of torque applied on the motor's shaft. An electric generator is mechanically identical to an electric motor, but operates with a reversed flow of power, converting mechanical energy into electrical energy. Electric motors can be powered by direct current (DC) sources, such as from batteries, or rectifiers, or by alternating current (AC) sources, such as a power grid, inverters or electrical generators. Electric motors may be classified by considerations such as power source type, construction, application and type of motion output. They can be powered by AC or DC, be brushed or brushless, single-phase, two-phase, or three-phase, axial or radial flux, and may be air-cooled or liquid-cooled. Standardized motors provide convenient mechanical power for industrial use. The largest are used for ship propulsion, pipeline compression and pumped-storage applications with output exceeding 100 megawatts. Applications include industrial fans, blowers and pumps, machine tools, household appliances, power tools, vehicles, and disk drives. Small motors may be found in electric watches. In certain applications, such as in regenerative braking with traction motors, electric motors can be used in reverse as generators to recover energy that might otherwise be lost as heat and friction. Electric motors produce linear or rotary force (torque) intended to propel some external mechanism, such as a fan or an elevator. An electric motor is generally designed for continuous rotation, or for linear movement over a significant distance compared to its size. Magnetic solenoids are also transducers that convert electrical power to mechanical motion, but can produce motion over only a limited distance.

Electric motors operate on one of three physical principles: magnetism, electrostatics and piezoelectricity. In magnetic motors, magnetic fields are formed in both the rotor and the stator. The product between these two fields gives rise to a force, and thus a torque on the motor shaft. One, or both, of these fields must change with the rotation of the rotor. This is done by switching the poles on and off at the right time, or varying the strength of the pole. The main types are DC motors and AC motors, with the latter replacing the former. AC electric motors are either asynchronous or synchronous. Once started, a synchronous motor requires synchrony with the moving magnetic field's speed for all normal torque conditions. In synchronous machines, the magnetic field must be provided by means other than induction, such as from separately excited windings or permanent magnets. A fractional-horsepower motor either has a rating below about 1 horsepower (0.746 kW), or is manufactured with a standard-frame size smaller than a standard 1 HP motor. Many household and industrial motors are in the fractional-horsepower class. Notes: Rotation is independent of the frequency of the AC voltage. Rotation is equal to synchronous speed (motor-stator-field speed). In SCIM, fixed-speed operation rotation is equal to synchronous speed, less slip speed. In non-slip energy-recovery systems, WRIM is usually used for motor-starting but can be used to vary load speed. Variable-speed operation. Whereas induction- and synchronous-motor drives are typically with either six-step or sinusoidal-waveform output, BLDC-motor drives are usually with trapezoidal-current waveform; the behavior of both sinusoidal and trapezoidal PM machines is, however, identical in terms of their fundamental aspects. In variable-speed operation, WRIM is used in slip-energy recovery and double-fed induction-machine applications. A cage winding is a shorted-circuited squirrel-cage rotor, a wound winding is connected externally through slip rings. Mostly single-phase with some three-phase. Abbreviations: BLAC – Brushless AC BLDC – Brushless DC BLDM – Brushless DC motor EC – Electronic commutator PM – Permanent magnet IPMSM – Interior permanent-magnet synchronous motor PMSM – Permanent magnet synchronous motor SPMSM – Surface permanent magnet synchronous motor SCIM – Squirrel-cage induction motor SRM – Switched reluctance motor SyRM – Synchronous reluctance motor VFD – Variable-frequency drive WRIM – Wound-rotor induction motor WRSM – Wound-rotor synchronous motor LRA – Locked-rotor amps: The current you can expect under starting conditions when you apply full voltage. It occurs instantly during start-up. RLA – Rated-load amps: The maximum current a motor should draw under any operating conditions. Often mistakenly called running-load amps, which leads people to believe, incorrectly, that the motor should always pull these amps. FLA – Full-load amps: Changed in 1976 to "RLA – rated-load amps".

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https://en.wikipedia.org/wiki/Adi%20Shankara

Adi Shankara

Works

Adi Shankara (8th cent. CE), also called Adi Shankaracharya (, ), was an Indian Vedic scholar and teacher (acharya), whose works present a harmonizing reading of the sastras, with liberating knowledge of the self at its core, synthesizing the Advaita Vedanta teachings of his time. The title of Shankracharya, used by heads of the amnaya monasteries is derived from his name. Due to his later fame, over 300 texts are attributed to his name, including commentaries (Bhāṣya), introductory topical expositions (Prakaraṇa grantha) and poetry (Stotra). However most of these are likely to be by admirers or pretenders or scholars with an eponymous name. Works known to be written by Shankara himself are the Brahmasutrabhasya, his commentaries on ten Mukhya (principal) Upanishads, his commentary on the Bhagavad Gita, and the Upadesasahasri. The authenticity of Shankara being the author of has been questioned. The central postulation of Shankara's writings is the identity of the Self (Ātman) and Brahman, defending the liberating knowledge of the Self, taking the Upanishads as an independent means of knowledge, against the ritually-oriented Mīmāṃsā school of Hinduism. Shankara's Advaita shows influences from Mahayana Buddhism, despite Shankara's critiques; and Hindu Vaishnavist opponents have even accused Shankara of being a "crypto-Buddhist," a qualification which is rejected by the Advaita Vedanta tradition, highlighting their respective views on Atman, Anatta and Brahman. Shankara has an unparallelled status in the tradition of Advaita Vedanta, but his influence on Hindu intellectual thought has been questioned. Until the 10th century Shankara was overshadowed by his older contemporary Mandana-Misra, and there is no mention of him in concurring Hindu, Buddhist or Jain sources until the 11th century. The popular image Shankara started to take shape only in the 14th century, centuries after his death, when Sringeri matha started to receive patronage from the kings of the Vijayanagara Empire and shifted their allegiance from advaitic Agamic Saivism to Brahmanical Advaita orthodoxy. Hagiographies dating from the 14th-17th centuries deified him as a ruler-renunciate, travelling on a digvijaya (conquest of the four quarters) across the Indian subcontinent to propagate his philosophy, defeating his opponents in theological debates These hagiographies portray him as founding four mathas ("monasteries"), and Adi Shankara also came to be regarded as the organiser of the Dashanami monastic order, and the unifier of the Shanmata tradition of worship.

Adi Shankara's works are the foundation of Advaita Vedanta school of Hinduism, and his doctrine, states Sengaku Mayeda, "has been the source from which the main currents of modern Indian thought are derived". Over 300 texts are attributed to his name, including commentaries (Bhāṣya), original philosophical expositions (Prakaraṇa grantha) and poetry (Stotra). However most of these are not authentic works of Shankara and are likely to be by his admirers or scholars whose name was also Shankaracharya. Piantelli has published a complete list of works attributed to Adi Sankara, along with issues of authenticity for most.

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https://en.wikipedia.org/wiki/Linear%20algebra

Linear algebra

History

Linear algebra is the branch of mathematics concerning linear equations such as: linear maps such as: and their representations in vector spaces and through matrices. Linear algebra is central to almost all areas of mathematics. For instance, linear algebra is fundamental in modern presentations of geometry, including for defining basic objects such as lines, planes and rotations. Also, functional analysis, a branch of mathematical analysis, may be viewed as the application of linear algebra to spaces of functions. Linear algebra is also used in most sciences and fields of engineering, because it allows modeling many natural phenomena, and computing efficiently with such models. For nonlinear systems, which cannot be modeled with linear algebra, it is often used for dealing with first-order approximations, using the fact that the differential of a multivariate function at a point is the linear map that best approximates the function near that point.

Fearnley-Sander, Desmond, "Hermann Grassmann and the Creation of Linear Algebra", American Mathematical Monthly 86 (1979), pp. 809–817.

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https://en.wikipedia.org/wiki/Ethiopia

Ethiopia

Etymology

Ethiopia, officially the Federal Democratic Republic of Ethiopia, is a landlocked country in the Horn of Africa. It shares borders with Eritrea to the north, Djibouti to the northeast, Somalia to the east and northeast, Kenya to the south, South Sudan to the west, and Sudan to the northwest. Ethiopia has a total area of . As of 2022, it is home to around 113.5 million inhabitants, making it the 12th-most populous country in the world and the 2nd-most populous in Africa after Nigeria. The national capital and largest city, Addis Ababa, lies several kilometres west of the East African Rift that splits the country into the African and Somali tectonic plates. Anatomically modern humans emerged from modern-day Ethiopia and set out to the Near East and elsewhere in the Middle Paleolithic period. Southwestern Ethiopia has been proposed as a possible homeland of the Afroasiatic language family. In 980 BCE, the Kingdom of D'mt extended its realm over Eritrea and the northern region of Ethiopia, while the Kingdom of Aksum maintained a unified civilization in the region for 900 years. Christianity was embraced by the kingdom in 330, and Islam arrived by the first Hijra in 615. After the collapse of Aksum in 960, a variety of kingdoms, largely tribal confederations, existed in the land of Ethiopia. The Zagwe dynasty ruled the north-central parts until being overthrown by Yekuno Amlak in 1270, inaugurating the Ethiopian Empire and the Solomonic dynasty, claimed descent from the biblical Solomon and Queen of Sheba under their son Menelik I. By the 14th century, the empire grew in prestige through territorial expansion and fighting against adjacent territories; most notably, the Ethiopian–Adal War (1529–1543) contributed to fragmentation of the empire, which ultimately fell under a decentralization known as Zemene Mesafint in the mid-18th century. Emperor Tewodros II ended Zemene Mesafint at the beginning of his reign in 1855, marking the reunification and modernization of Ethiopia. From 1878 onwards, Emperor Menelik II launched a series of conquests known as Menelik's Expansions, which resulted in the formation of Ethiopia's current border. Externally, during the late 19th century, Ethiopia defended itself against foreign invasions, including from Egypt and Italy; as a result, Ethiopia and Liberia preserved their sovereignty during the Scramble for Africa. In 1935, Ethiopia was occupied by Fascist Italy and annexed with Italian-possessed Eritrea and Somaliland, later forming Italian East Africa. In 1941, during World War II, it was occupied by the British Army, and its full sovereignty was restored in 1944 after a period of military administration. The Derg, a Soviet-backed military junta, took power in 1974 after deposing Emperor Haile Selassie and the Solomonic dynasty, and ruled the country for nearly 17 years amidst the Ethiopian Civil War. Following the dissolution of the Derg in 1991, the Ethiopian People's Revolutionary Democratic Front (EPRDF) dominated the country with a new constitution and ethnic-based federalism. Since then, Ethiopia has suffered from prolonged and unsolved inter-ethnic clashes and political instability marked by democratic backsliding. From 2018, regional and ethnically based factions carried out armed attacks in multiple ongoing wars throughout Ethiopia. Ethiopia is a multi-ethnic state with over 80 different ethnic groups. Christianity is the most widely professed faith in the country, with significant minorities of the adherents of Islam and a small percentage to traditional faiths. This sovereign state is a founding member of the UN, the Group of 24, the Non-Aligned Movement, the Group of 77, and the Organisation of African Unity. Addis Ababa is the headquarters of the African Union, the Pan African Chamber of Commerce and Industry, the United Nations Economic Commission for Africa, the African Standby Force and many of the global non-governmental organizations focused on Africa. Ethiopia is considered an emerging power and developing country, having the fastest economic growth in Sub-Saharan African countries because of foreign direct investment in expansion of agricultural and manufacturing industries. However, in terms of per capita income and the Human Development Index, the country is regarded as poor with high rates of poverty, poor respect for human rights, and a literacy rate of only 49%. Agriculture is the largest economic sector in Ethiopia, accounting for 36% of the country's gross domestic product as of 2020.

The Greek name Αἰθιοπία (from , Aithiops, "an Ethiopian") is a compound word, derived from the two Greek words, from + (aithō "I burn" + ōps "face"). According to the Liddell-Scott Jones Greek-English Lexicon, the designation properly translates as burnt-face in noun form and red-brown in adjectival form. The historian Herodotus used the appellation to denote those parts of Africa south of the Sahara that were then known within the Ecumene (habitable world). Since the Greeks understood the term as "dark-faced", they divided the Ethiopians into two, those in Africa and those to the east from eastern Turkey to India. This Greek name was borrowed into Amharic as ኢትዮጵያ, ʾĪtyōṗṗyā. In Greco-Roman epigraphs, Aethiopia was a specific toponym for ancient Nubia. At least as early as c. 850, the name Aethiopia also occurs in many translations of the Old Testament in allusion to Nubia. The ancient Hebrew texts identify Nubia instead as Kush. However, in the New Testament, the Greek term Aithiops does occur, referring to a servant of the Kandake, the queen of Kush. Following the Hellenic and biblical traditions, the Monumentum Adulitanum, a 3rd-century inscription belonging to the Aksumite Empire, indicates that Aksum's ruler governed an area which was flanked to the west by the territory of Ethiopia and Sasu. The Aksumite King Ezana eventually conquered Nubia the following century, and the Aksumites thereafter appropriated the designation "Ethiopians" for their own kingdom. In the Ge'ez version of the Ezana inscription, Aἰθίοπες is equated with the unvocalized Ḥbšt and Ḥbśt (Ḥabashat), and denotes for the first time the highland inhabitants of Aksum. This new demonym was subsequently rendered as ḥbs ('Aḥbāsh) in Sabaic and as Ḥabasha in Arabic. In the 15th-century Ge'ez Book of Axum, the name is ascribed to a legendary individual called Ityopp'is. He was an extra-biblical son of Cush, son of Ham, said to have founded the city of Axum. In English, and generally outside of Ethiopia, the country was historically known as Abyssinia. This toponym was derived from the Latinized form of the ancient Habash.

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https://en.wikipedia.org/wiki/Mathematics

Mathematics

Etymology

Mathematics () is an area of knowledge that includes such topics as numbers (arithmetic and number theory), formulas and related structures (algebra), shapes and the spaces in which they are contained (geometry), and quantities and their changes (calculus and analysis). Most mathematical activity involves the discovery of properties of abstract objects and the use of pure reason to prove them. These objects consist of either abstractions from nature orin modern mathematicsentities that are stipulated with certain properties, called axioms. A proof consists of a succession of applications of deductive rules to already established results. These results include previously proved theorems, axioms, andin case of abstraction from naturesome basic properties that are considered as true starting points of the theory under consideration. Mathematics is used in science for modeling phenomena, which then allows predictions to be made from experimental laws. The independence of mathematical truth from any experimentation implies that the accuracy of such predictions depends only on the adequacy of the model. Inaccurate predictions, rather than being caused by incorrect mathematics, imply the need to change the mathematical model used. For example, the perihelion precession of Mercury could only be explained after the emergence of Einstein's general relativity, which replaced Newton's law of gravitation as a better mathematical model. Mathematics is essential in the sciences, engineering, medicine, finance, computer science and the social sciences. The fundamental truths of mathematics are independent from any scientific experimentation, although mathematics is extensively used for modeling phenomena. Some areas of mathematics, such as statistics and game theory, are developed in close correlation with their applications and are often grouped under applied mathematics. Other mathematical areas are developed independently from any application (and are therefore called pure mathematics), but practical applications are often discovered later. A fitting example is the problem of integer factorization, which goes back to Euclid, but which had no practical application before its use in the RSA cryptosystem (for the security of computer networks). Historically, the concept of a proof and its associated mathematical rigour first appeared in Greek mathematics, most notably in Euclid's Elements. Since its beginning, mathematics was essentially divided into geometry, and arithmetic (the manipulation of natural numbers and fractions), until the 16th and 17th centuries, when algebra and infinitesimal calculus were introduced as new areas of the subject. Since then, the interaction between mathematical innovations and scientific discoveries has led to a rapid increase in the development of mathematics. At the end of the 19th century, the foundational crisis of mathematics led to the systematization of the axiomatic method. This gave rise to a dramatic increase in the number of mathematics areas and their fields of applications. An example of this is the Mathematics Subject Classification, which lists more than 60 first-level areas of mathematics.

The word mathematics comes from Ancient Greek máthēma (), meaning "that which is learnt," "what one gets to know," hence also "study" and "science". The word for "mathematics" came to have the narrower and more technical meaning "mathematical study" even in Classical times. Its adjective is mathēmatikós (), meaning "related to learning" or "studious," which likewise further came to mean "mathematical." In particular, mathēmatikḗ tékhnē (; ) meant "the mathematical art." Similarly, one of the two main schools of thought in Pythagoreanism was known as the mathēmatikoi (μαθηματικοί)—which at the time meant "learners" rather than "mathematicians" in the modern sense. The Pythagoreans were likely the first to constrain the use of the word to just the study of arithmetic and geometry. By the time of Aristotle this meaning was fully established. In Latin, and in English until around 1700, the term mathematics more commonly meant "astrology" (or sometimes "astronomy") rather than "mathematics"; the meaning gradually changed to its present one from about 1500 to 1800. This has resulted in several mistranslations. For example, Saint Augustine's warning that Christians should beware of mathematici, meaning astrologers, is sometimes mistranslated as a condemnation of mathematicians. The apparent plural form in English goes back to the Latin neuter plural (Cicero), based on the Greek plural ta mathēmatiká (), used by Aristotle (384–322 BC), and meaning roughly "all things mathematical", although it is plausible that English borrowed only the adjective mathematic(al) and formed the noun mathematics anew, after the pattern of physics and metaphysics, which were inherited from Greek. In English, the noun mathematics takes a singular verb. It is often shortened to maths or, in North America, math.

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https://en.wikipedia.org/wiki/Kenya

Kenya

Etymology

Kenya, officially the Republic of Kenya (), is a country in East Africa. At , Kenya is the world's 48th largest country by area. With a population of more than 47.6 million in the 2019 census, Kenya is the 29th most populous country in the world. Kenya's capital and largest city is Nairobi, while its oldest, currently second largest city, and first capital is the coastal city of Mombasa. Kisumu City is the third-largest city and also an inland port on Lake Victoria. Other important urban centres include Nakuru and Eldoret. As of 2020, Kenya is the third-largest economy in sub-Saharan Africa after Nigeria and South Africa. Kenya is bordered by South Sudan to the northwest, Ethiopia to the north, Somalia to the east, Uganda to the west, Tanzania to the south, and the Indian Ocean to the southeast. Its geography, climate and population vary widely, ranging from cold snow-capped mountaintops (Batian, Nelion and Point Lenana on Mount Kenya) with vast surrounding forests, wildlife and fertile agricultural regions to temperate climates in western and rift valley counties and dry less fertile arid and semi-arid areas and absolute deserts (Chalbi Desert and Nyiri Desert). Kenya's earliest inhabitants were hunter-gatherers, like the present-day Hadza people. According to archaeological dating of associated artifacts and skeletal material, Cushitic speakers first settled in Kenya's lowlands between 3,200 and 1,300 BC, a phase known as the Lowland Savanna Pastoral Neolithic. Nilotic-speaking pastoralists (ancestral to Kenya's Nilotic speakers) began migrating from present-day South Sudan into Kenya around 500 BC. Bantu people settled at the coast and the interior between 250 BC and 500 AD. European contact began in 1500 AD with the Portuguese Empire, and effective colonisation of Kenya began in the 19th century during the European exploration of the interior. Modern-day Kenya emerged from a protectorate established by the British Empire in 1895 and the subsequent Kenya Colony, which began in 1920. Numerous disputes between the UK and the colony led to the Mau Mau revolution, which began in 1952, and the declaration of independence in 1963. After independence, Kenya remained a member of the Commonwealth of Nations. The current constitution was adopted in 2010 and replaced the 1963 independence constitution. Kenya is a presidential representative democratic republic, in which elected officials represent the people and the president is the head of state and government. Kenya is a member of the United Nations, Commonwealth of Nations, World Bank, International Monetary Fund, COMESA, International Criminal Court, as well as other international organisations. With a GNI of 1,840, Kenya is a lower-middle-income economy. Kenya's economy is the largest in eastern and central Africa, with Nairobi serving as a major regional commercial hub. Agriculture is the largest sector: tea and coffee are traditional cash crops, while fresh flowers are a fast-growing export. The service industry is also a major economic driver, particularly tourism. Kenya is a member of the East African Community trade bloc, though some international trade organisations categorise it as part of the Greater Horn of Africa. Africa is Kenya's largest export market, followed by the European Union.

The Republic of Kenya is named after Mount Kenya. The earliest recorded version of the modern name was written by German explorer Johann Ludwig Krapf in the 19th century. While travelling with a Kamba caravan led by the legendary long-distance trader Chief Kivoi, Krapf spotted the mountain peak and asked what it was called. Kivoi told him "Kĩ-Nyaa" or "Kĩĩma- Kĩĩnyaa", probably because the pattern of black rock and white snow on its peaks reminded him of the feathers of the male ostrich. The Agikuyu, who inhabit the slopes of Mt. Kenya, call it Kĩrĩma Kĩrĩnyaga in Kikuyu, while the Embu call it "Kirenyaa". All three names have the same meaning. Ludwig Krapf recorded the name as both Kenia and Kegnia. Some have said that this was a precise notation of the African pronunciation . An 1882 map drawn by Joseph Thompsons, a Scottish geologist and naturalist, indicated Mt. Kenya as Mt. Kenia. The mountain's name was accepted, pars pro toto, as the name of the country. It did not come into widespread official use during the early colonial period, when the country was referred to as the East African Protectorate. The official name was changed to the Colony of Kenya in 1920.

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https://en.wikipedia.org/wiki/Mediterranean%20Sea

Mediterranean Sea

Biogeochemistry

The Mediterranean Sea is a sea connected to the Atlantic Ocean, surrounded by the Mediterranean Basin and almost completely enclosed by land: on the north by Western and Southern Europe and Anatolia, on the south by North Africa, and on the east by the Levant. The Sea has played a central role in the history of Western civilization. Although the Mediterranean is sometimes considered a part of the Atlantic Ocean, it is usually referred to as a separate body of water. Geological evidence indicates that around 5.9 million years ago, the Mediterranean was cut off from the Atlantic and was partly or completely desiccated over a period of some 600,000 years during the Messinian salinity crisis before being refilled by the Zanclean flood about 5.3 million years ago. The Mediterranean Sea covers an area of about , representing 0.7% of the global ocean surface, but its connection to the Atlantic via the Strait of Gibraltar—the narrow strait that connects the Atlantic Ocean to the Mediterranean Sea and separates the Iberian Peninsula in Europe from Morocco in Africa—is only wide. In oceanography, it is sometimes called the Eurafrican Mediterranean Sea, the European Mediterranean Sea or the African Mediterranean Sea to distinguish it from mediterranean seas elsewhere. The Mediterranean Sea encompasses a vast number of islands, some of them being of volcanic origin. The two by far largest islands are Sicily and Sardinia. The Mediterranean Sea has an average depth of and the deepest recorded point is in the Calypso Deep in the Ionian Sea. It lies between latitudes 30° and 46° N and longitudes 6° W and 36° E. Its west–east length, from the Strait of Gibraltar to the Gulf of Iskenderun, on the southeastern coast of Turkey, is about . The north–south length varies greatly between different shorelines and whether only straight routes are considered. Also including longitudal changes, the shortest shipping route between the multinational Gulf of Trieste and the Libyan coastline of Gulf of Sidra is about . The water temperatures are mild in winter and warm in summer and give name to the mediterranean climate type due to the majority of precipitation falling in the cooler months. Its southern and eastern coastlines are lined with hot deserts not far inland, but the immediate coastline on all sides of the Mediterranean tends to have strong maritime moderation. The sea was an important route for merchants and travelers of ancient times, facilitating trade and cultural exchange between peoples of the region. The history of the Mediterranean region is crucial to understanding the origins and development of many modern societies. The Roman Empire maintained nautical hegemony over the sea for centuries. The countries surrounding the Mediterranean in clockwise order are Spain, France, Monaco, Italy, Slovenia, Croatia, Bosnia and Herzegovina, Montenegro, Albania, Greece, Turkey, Syria, Lebanon, Israel, Palestine, Egypt, Libya, Tunisia, Algeria, and Morocco; Malta and Cyprus are island countries in the sea. In addition, the disputed territory of North Cyprus, and some enclaves, notably Gibraltar and Ceuta, have coastlines on the sea. Alexandria is the largest coastal settlement. The drainage basin encompasses a large number of other countries, the Nile being the longest river ending in the Mediterranean Sea.

In spite of its great biodiversity, concentrations of chlorophyll and nutrients in the Mediterranean Sea are very low, making it one of the most oligotrophic ocean regions in the world. The Mediterranean Sea is commonly referred to as an LNLC (Low-Nutrient, Low-Chlorophyll) area. The Mediterranean Sea fits the definition of a desert in which its nutrient contents are low, making it difficult for plants and animals to develop. There are steep gradients in nutrient concentrations, chlorophyll concentrations and primary productivity in the Mediterranean. Nutrient concentrations in the western part of the basin are about double the concentrations in the eastern basin. The Alboran Sea, close to the Strait of Gibraltar, has a daily primary productivity of about 0.25 g C (grams of carbon) m−2 day−1 whereas the eastern basin has an average daily productivity of 0.16 g C m−2 day−1. For this reason, the eastern part of the Mediterranean Sea is termed "ultraoligotrophic". The productive areas of the Mediterranean Sea are few and small. High (i.e. more than 0.5 grams of Chlorophyll a per cubic meter) productivity occurs in coastal areas, close to the river mouths which are the primary suppliers of dissolved nutrients. The Gulf of Lion has a relatively high productivity because it is an area of high vertical mixing, bringing nutrients to the surface waters that can be used by phytoplankton to produce Chlorophyll a. Primary productivity in the Mediterranean is also marked by an intense seasonal variability. In winter, the strong winds and precipitation over the basin generate vertical mixing, bringing nutrients from the deep waters to the surface, where phytoplankton can convert it into biomass. However, in winter, light may be the limiting factor for primary productivity. Between March and April, spring offers the ideal trade-off between light intensity and nutrient concentrations in surface for a spring bloom to occur. In summer, high atmospheric temperatures lead to the warming of the surface waters. The resulting density difference virtually isolates the surface waters from the rest of the water column and nutrient exchanges are limited. As a consequence, primary productivity is very low between June and October. Oceanographic expeditions uncovered a characteristic feature of the Mediterranean Sea biogeochemistry: most of the chlorophyll production does not occur on the surface, but in sub-surface waters between 80 and 200 meters deep. Another key characteristic of the Mediterranean is its high nitrogen-to-phosphorus ratio (N:P). Redfield demonstrated that most of the world's oceans have an average N:P ratio around 16. However, the Mediterranean Sea has an average N:P between 24 and 29, which translates a widespread phosphorus limitation. Because of its low productivity, plankton assemblages in the Mediterranean Sea are dominated by small organisms such as picophytoplankton and bacteria.

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https://en.wikipedia.org/wiki/Muhammad%20ibn%20Musa%20al-Khwarizmi

Muhammad ibn Musa al-Khwarizmi

Honors

Muḥammad ibn Mūsā al-Khwārizmī (; ), or al-Khwarizmi was a Persian polymath from Khwarazm, who produced vastly influential works in mathematics, astronomy, and geography. Around 820 CE, he was appointed as the astronomer and head of the library of the House of Wisdom in Baghdad. Al-Khwarizmi's popularizing treatise on algebra (The Compendious Book on Calculation by Completion and Balancing, c. 813–833 CE) presented the first systematic solution of linear and quadratic equations. One of his principal achievements in algebra was his demonstration of how to solve quadratic equations by completing the square, for which he provided geometric justifications. Because he was the first to treat algebra as an independent discipline and introduced the methods of "reduction" and "balancing" (the transposition of subtracted terms to the other side of an equation, that is, the cancellation of like terms on opposite sides of the equation), he has been described as the father or founder of algebra. The term algebra itself comes from the title of his book (the word al-jabr meaning "completion" or "rejoining"). His name gave rise to the terms algorism and algorithm, as well as Spanish, Italian and Portuguese terms algoritmo, and Spanish guarismo and Portuguese algarismo meaning "digit". In the 12th century, Latin translations of his textbook on arithmetic (Algorithmo de Numero Indorum) which codified the various Indian numerals, introduced the decimal positional number system to the Western world. The Compendious Book on Calculation by Completion and Balancing, translated into Latin by Robert of Chester in 1145, was used until the sixteenth century as the principal mathematical text-book of European universities. In addition to his best-known works, he revised Ptolemy's Geography, listing the longitudes and latitudes of various cities and localities. He further produced a set of astronomical tables and wrote about calendaric works, as well as the astrolabe and the sundial. He also made important contributions to trigonometry, producing accurate sine and cosine tables, and the first table of tangents.

Al-Khwarizmi (crater) — A crater on the far side of the moon → NASA Portal: Apollo 11, Photography Index. 13498 Al Chwarizmi — Main-belt Asteroid, Discovered 1986 Aug 6 by E. W. Elst and V. G. Ivanova at Smolyan. 11156 Al-Khwarismi — Main-belt Asteroid, Discovered 1997 Dec 31 by P. G. Comba at Prescott.