Datasets:

TREC-AToMiC

/

TREC-2023-Text-to-Image

like 1

projected-00019323-001

https://en.wikipedia.org/wiki/Middle%20East

Middle East

Terminology

The Middle East (, ISO 233: ) is a geopolitical region commonly encompassing Arabia (including the Arabian Peninsula and Bahrain), Asia Minor (Asian part of Turkey except Hatay Province), East Thrace (European part of Turkey), Egypt, Iran, the Levant (including Ash-Shām and Cyprus), Mesopotamia (modern-day Iraq), and the Socotra Archipelago (a part of Yemen). The term came into widespread usage as a replacement of the term Near East (as opposed to the Far East) beginning in the early 20th century. The term "Middle East" has led to some confusion over its changing definitions, and has been viewed by some to be discriminatory or too Eurocentric. The region includes the vast majority of the territories included in the closely associated definition of Western Asia (including Iran), but without the South Caucasus, and additionally includes all of Egypt (not just the Sinai Region) and all of Turkey (not just the part barring East Thrace). Most Middle Eastern countries (13 out of 18) are part of the Arab world. The most populous countries in the region are Egypt, Iran, and Turkey, while Saudi Arabia is the largest Middle Eastern country by area. The history of the Middle East dates back to ancient times, with the geopolitical importance of the region being recognized for millennia. Several major religions have their origins in the Middle East, including Judaism, Christianity, and Islam. Arabs constitute the main socioethnic grouping in the region, followed by Turks, Persians, Kurds, Azeris, Copts, Jews, Assyrians, Iraqi Turkmen, Yazidis, and Greek Cypriots. The Middle East generally has a hot, arid climate, especially in the Peninsula and Egyptian regions. Several major rivers providing irrigation to support agriculture in limited areas here such as the Nile Delta in Egypt, the Tigris and Euphrates watersheds of Mesopotamia, and most of what is known as the Fertile Crescent. Conversely the Levantine coast and most of Turkey have more temperate, oceanic and wetter climates. Most of the countries that border the Persian Gulf have vast reserves of petroleum, with monarchs of the Arabian Peninsula in particular benefiting economically from petroleum exports. Because of the arid climate and heavy reliance on the fossil fuel industry, the Middle East is both a heavy contributor to climate change and a region expected to be severely negatively impacted by it. Other concepts of the region exist including the broader the Middle East and North Africa (MENA), which includes states of the Maghreb and the Sudan, or the "Greater Middle East" which additionally also includes parts of East Africa, Mauritania, Afghanistan, Pakistan, and sometimes Central Asia and the South Caucasus.

The term "Middle East" may have originated in the 1850s in the British India Office. However, it became more widely known when American naval strategist Alfred Thayer Mahan used the term in 1902 to "designate the area between Arabia and India". During this time the British and Russian Empires were vying for influence in Central Asia, a rivalry which would become known as the Great Game. Mahan realized not only the strategic importance of the region, but also of its center, the Persian Gulf. He labeled the area surrounding the Persian Gulf as the Middle East, and said that after Egypt's Suez Canal, it was the most important passage for Britain to control in order to keep the Russians from advancing towards British India. Mahan first used the term in his article "The Persian Gulf and International Relations", published in September 1902 in the National Review, a British journal. Mahan's article was reprinted in The Times and followed in October by a 20-article series entitled "The Middle Eastern Question," written by Sir Ignatius Valentine Chirol. During this series, Sir Ignatius expanded the definition of Middle East to include "those regions of Asia which extend to the borders of India or command the approaches to India." After the series ended in 1903, The Times removed quotation marks from subsequent uses of the term. Until World War II, it was customary to refer to areas centered around Turkey and the eastern shore of the Mediterranean as the "Near East", while the "Far East" centered on China, and the Middle East then meant the area from Mesopotamia to Burma, namely the area between the Near East and the Far East. In the late 1930s, the British established the Middle East Command, which was based in Cairo, for its military forces in the region. After that time, the term "Middle East" gained broader usage in Europe and the United States, with the Middle East Institute founded in Washington, D.C. in 1946, among other usage. The corresponding adjective is Middle Eastern and the derived noun is Middle Easterner. While non-Eurocentric terms such "Southwest Asia" or "Swasia" has been sparsedly used, the inclusion of an African country, Egypt, in the definition questions the usefulness of using such terms.

projected-19653787-001

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

Caspian Sea

Etymology

The Caspian Sea is the world's largest inland body of water, often described as the world's largest lake or a full-fledged sea. An endorheic basin, it lies between Europe and Asia; east of the Caucasus, west of the broad steppe of Central Asia, south of the fertile plains of Southern Russia in Eastern Europe, and north of the mountainous Iranian Plateau of Western Asia. It covers (excluding the highly saline lagoon of Garabogazköl to its east) and a volume of . It has a salinity of approximately 1.2% (12 g/L), about a third of the salinity of average seawater. It is bounded by Kazakhstan to the northeast, Russia to the northwest, Azerbaijan to the southwest, Iran to the south, and Turkmenistan to the southeast. The sea stretches nearly from north to south, with an average width of . Its gross coverage is and the surface is about below sea level. Its main freshwater inflow, Europe's longest river, the Volga, enters at the shallow north end. Two deep basins form its central and southern zones. These lead to horizontal differences in temperature, salinity, and ecology. The seabed in the south reaches below sea level, which is the second-lowest natural non-oceanic depression on Earth after Lake Baikal (). Written accounts from the ancient inhabitants of its coast perceived the Caspian Sea as an ocean, probably because of its salinity and large size. The Caspian Sea is home to a wide range of species and is known for its caviar and oil industries. Pollution from the oil industry and dams on rivers draining into it have harmed its ecology.

The lake's name stems from Caspi, an ancient people who lived to the southwest of the sea in Transcaucasia. Strabo (died circa AD 24) wrote that "to the country of the Albanians (Caucasus Albania not to be confused with the country of Albania) belongs also the territory called Caspiane, which was named after the Caspian tribe, as was also the sea; but the tribe has now disappeared". Moreover, the Caspian Gates, part of Iran's Tehran province, may evince such a people migrated to the south. The Iranian city of Qazvin shares the root of its name with this common name for the sea. The traditional and medieval Arabic name for the sea was Bahr(sea) Xazar but in recent centuries common and standard name in Arabic language is Baḥr Qazvin Arabized from Caspian. In modern , Kaspiyskoye more. Some Turkic ethnic groups refer to it with the Caspi(an) descriptor; in Kazakh it is called , Kaspiy teñizi, , . Others refer to it as the Khazar sea: ; , . In all these the first word refers to the historical Khazars who had a large empire based to the north of the Caspian Sea between the 7th and 10th centuries. In Iran, the lake is referred to as the Mazandaran Sea (), after the historic Mazandaran Province at its southern shores. Old Russian sources use the Khvalyn or Khvalis Sea () after the name of Khwarezmia. Among Greeks and Persians in classical antiquity it was the Hyrcanian ocean. Renaissance European maps labelled it as the Abbacuch Sea (Oronce Fine's 1531 world map), Mar de Bachu (Ortellius' 1570 map), or Mar de Sala (Mercator's 1569 map). It was also sometimes called the Kumyk Sea and Tarki Sea (derived from the name of the Kumyks and their historical capital Tarki).

projected-19653787-033

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

Caspian Sea

Transportation

The Caspian Sea is the world's largest inland body of water, often described as the world's largest lake or a full-fledged sea. An endorheic basin, it lies between Europe and Asia; east of the Caucasus, west of the broad steppe of Central Asia, south of the fertile plains of Southern Russia in Eastern Europe, and north of the mountainous Iranian Plateau of Western Asia. It covers (excluding the highly saline lagoon of Garabogazköl to its east) and a volume of . It has a salinity of approximately 1.2% (12 g/L), about a third of the salinity of average seawater. It is bounded by Kazakhstan to the northeast, Russia to the northwest, Azerbaijan to the southwest, Iran to the south, and Turkmenistan to the southeast. The sea stretches nearly from north to south, with an average width of . Its gross coverage is and the surface is about below sea level. Its main freshwater inflow, Europe's longest river, the Volga, enters at the shallow north end. Two deep basins form its central and southern zones. These lead to horizontal differences in temperature, salinity, and ecology. The seabed in the south reaches below sea level, which is the second-lowest natural non-oceanic depression on Earth after Lake Baikal (). Written accounts from the ancient inhabitants of its coast perceived the Caspian Sea as an ocean, probably because of its salinity and large size. The Caspian Sea is home to a wide range of species and is known for its caviar and oil industries. Pollution from the oil industry and dams on rivers draining into it have harmed its ecology.

Although the Caspian Sea is endorheic, its main tributary, the Volga, is connected by important shipping canals with the Don River (and thus the Black Sea) and with the Baltic Sea, with branch canals to Northern Dvina and to the White Sea. Another Caspian tributary, the Kuma River, is connected by an irrigation canal with the Don basin as well. Scheduled ferry services (including train ferries) across the sea chiefly are between: Türkmenbaşy in Turkmenistan, (formerly Krasnovodsk) and Baku. Aktau, Kazakhstan and Baku. Cities in Iran and Russia (chiefly for cargo.)

projected-19653842-002

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

Organism

Definitions

In biology, an organism () is any organic, living system that functions as an individual entity. All organisms are composed of cells (cell theory). Organisms are classified by taxonomy into groups such as multicellular animals, plants, and fungi; or unicellular microorganisms such as protists, bacteria, and archaea. All types of organisms are capable of reproduction, growth and development, maintenance, and some degree of response to stimuli. Beetles, squids, tetrapods, mushrooms, and vascular plants are examples of multicellular organisms that differentiate specialized tissues and organs during development. A unicellular organism may be either a prokaryote or a eukaryote. Prokaryotes are represented by two separate domains – bacteria and archaea. Eukaryotic organisms are characterized by the presence of a membrane-bound cell nucleus and contain additional membrane-bound compartments called organelles (such as mitochondria in animals and plants and plastids in plants and algae, all generally considered to be derived from endosymbiotic bacteria). Fungi, animals and plants are examples of kingdoms of organisms within the eukaryotes. Estimates on the number of Earth's current species range from 2 million to 1 trillion, of which over 1.7 million have been documented. More than 99% of all species, amounting to over five billion species, that ever lived are estimated to be extinct. In 2016, a set of 355 genes from the last universal common ancestor (LUCA) of all organisms from Earth was identified.

An organism may be defined as an assembly of molecules functioning as a more or less stable whole that exhibits the properties of life. Dictionary definitions can be broad, using phrases such as "any living structure, such as a plant, animal, fungus or bacterium, capable of growth and reproduction". Many definitions exclude viruses and possible man-made non-organic life forms, as viruses are dependent on the biochemical machinery of a host cell for reproduction. A superorganism is an organism consisting of many individuals working together as a single functional or social unit. There has been controversy about the best way to define the organism and indeed about whether or not such a definition is necessary. Several contributions are responses to the suggestion that the category of "organism" may well not be adequate in biology.

projected-00019577-005

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

Moses

Historicity

Moses () is considered the most important prophet in Judaism and one of the most important prophets in Christianity, Islam, the Druze faith, the Baháʼí Faith and other Abrahamic religions. According to both the Bible and the Quran, Moses was the leader of the Israelites and lawgiver to whom the authorship, or "acquisition from heaven", of the Torah (the first five books of the Bible) is attributed. According to the Book of Exodus, Moses was born in a time when his people, the Israelites, an enslaved minority, were increasing in population and, as a result, the Egyptian Pharaoh worried that they might ally themselves with Egypt's enemies. Moses' Hebrew mother, Jochebed, secretly hid him when Pharaoh ordered all newborn Hebrew boys to be killed in order to reduce the population of the Israelites. Through Pharaoh's daughter (identified as Queen Bithia in the Midrash), the child was adopted as a foundling from the Nile and grew up with the Egyptian royal family. After killing an Egyptian slave-master who was beating a Hebrew, Moses fled across the Red Sea to Midian, where he encountered the Angel of the Lord, speaking to him from within a burning bush on Mount Horeb, which he regarded as the Mountain of God. God sent Moses back to Egypt to demand the release of the Israelites from slavery. Moses said that he could not speak eloquently, so God allowed Aaron, his elder brother, to become his spokesperson. After the Ten Plagues, Moses led the Exodus of the Israelites out of Egypt and across the Red Sea, after which they based themselves at Mount Sinai, where Moses received the Ten Commandments. After 40 years of wandering in the desert, Moses died on Mount Nebo at the age of 120, within sight of the Promised Land. Generally, Moses is seen as a legendary figure, whilst retaining the possibility that Moses or a Moses-like figure existed in the 13th century BCE. Rabbinical Judaism calculated a lifespan of Moses corresponding to 1391–1271 BCE; Jerome suggested 1592 BCE, and James Ussher suggested 1571 BCE as his birth year.

Scholars hold different opinions on the status of Moses in scholarship. For instance, according to William G. Dever, the modern scholarly consensus is that the biblical person of Moses is largely mythical while also holding that "a Moses-like figure may have existed somewhere in the southern Transjordan in the mid-late 13th century B.C." and that "archeology can do nothing" to prove or confirm either way. However, according to Solomon Nigosian, there are actually three prevailing views among biblical scholars: one is that Moses is not a historical figure, another view strives to anchor the decisive role he played in Israelite religion, and a third that argues there are elements of both history and legend from which "these issues are hotly debated unresolved matters among scholars". According to Brian Britt, there is divide amongst scholars when discussing matters on Moses that threatens gridlock. Jan Assmann argues that it cannot be known if Moses ever lived because there are no traces of him outside tradition. Though the names of Moses and others in the biblical narratives are Egyptian and contain genuine Egyptian elements, no extrabiblical sources point clearly to Moses. No references to Moses appear in any Egyptian sources prior to the fourth century BCE, long after he is believed to have lived. No contemporary Egyptian sources mention Moses, or the events of Exodus–Deuteronomy, nor has any archaeological evidence been discovered in Egypt or the Sinai wilderness to support the story in which he is the central figure. David Adams Leeming states that Moses is a mythic hero and the central figure in Hebrew mythology. The Oxford Companion to the Bible states that the historicity of Moses is the most reasonable (albeit not unbiased) assumption be made about him as his absence would leave a vacuum that cannot be explained away. Oxford Biblical Studies states that although few modern scholars are willing to support the traditional view that Moses himself wrote the five books of the Torah, there are certainly those who regard the leadership of Moses as too firmly based in Israel's corporate memory to be dismissed as pious fiction. The story of Moses's discovery picks up a familiar motif in ancient Near Eastern mythological accounts of the ruler who rises from humble origins. Thus Sargon of Akkad's Akkadian account of his own origins runs: Moses's story, like those of the other patriarchs, most likely had a substantial oral prehistory (he is mentioned in the Book of Jeremiah and the Book of Isaiah) and his name is apparently very ancient, as the tradition found in Exodus no longer understands its original meaning. Nevertheless, the completion of the Torah and its elevation to the centre of post-Exilic Judaism was as much or more about combining older texts as writing new ones – the final Pentateuch was based on existing traditions. Isaiah, written during the Exile (i.e., in the first half of the 6th century BCE), testifies to tension between the people of Judah and the returning post-Exilic Jews (the "gôlâ"), stating that God is the father of Israel and that Israel's history begins with the Exodus and not with Abraham. The conclusion to be inferred from this and similar evidence (e.g., the Book of Ezra and the Book of Nehemiah) is that the figure of Moses and the story of the Exodus must have been preeminent among the people of Judah at the time of the Exile and after, serving to support their claims to the land in opposition to those of the returning exiles. A theory developed by Cornelis Tiele in 1872, which has proved influential, argued that Yahweh was a Midianite god, introduced to the Israelites by Moses, whose father-in-law Jethro was a Midianite priest. It was to such a Moses that Yahweh reveals his real name, hidden from the Patriarchs who knew him only as El Shaddai. Against this view is the modern consensus that most of the Israelites were native to Palestine. Martin Noth argued that the Pentateuch uses the figure of Moses, originally linked to legends of a Transjordan conquest, as a narrative bracket or late redactional device to weld together four of the five, originally independent, themes of that work. and , the latter in a somewhat sensationalist manner, have suggested that the Moses story is a distortion or transmogrification of the historical pharaoh Amenmose (), who was dismissed from office and whose name was later simplified to (Mose). Aidan Dodson regards this hypothesis as "intriguing, but beyond proof". Rudolf Smend argues that the two details about Moses that were most likely to be historical are his name, of Egyptian origin, and his marriage to a Midianite woman, details which seem unlikely to have been invented by the Israelites; in Smend's view, all other details given in the biblical narrative are too mythically charged to be seen as accurate data. The name King Mesha of Moab has been linked to that of Moses. Mesha also is associated with narratives of an exodus and a conquest, and several motifs in stories about him are shared with the Exodus tale and that regarding Israel's war with Moab (2 Kings 3). Moab rebels against oppression, like Moses, leads his people out of Israel, as Moses does from Egypt, and his first-born son is slaughtered at the wall of Kir-hareseth as the firstborn of Israel are condemned to slaughter in the Exodus story, in what Calvinist theologian Peter Leithart described as "an infernal Passover that delivers Mesha while wrath burns against his enemies". An Egyptian version of the tale that crosses over with the Moses story is found in Manetho who, according to the summary in Josephus, wrote that a certain Osarseph, a Heliopolitan priest, became overseer of a band of lepers, when Amenophis, following indications by Amenhotep, son of Hapu, had all the lepers in Egypt quarantined in order to cleanse the land so that he might see the gods. The lepers are bundled into Avaris, the former capital of the Hyksos, where Osarseph prescribes for them everything forbidden in Egypt, while proscribing everything permitted in Egypt. They invite the Hyksos to reinvade Egypt, rule with them for 13 years – Osarseph then assumes the name Moses – and are then driven out. Other Egyptian figures which have been postulated as candidates for a historical Moses-like figure include the princes Ahmose-ankh and Ramose, who were sons of pharaoh Ahmose I, or a figure associated with the family of pharaoh Thutmose III. Israel Knohl has proposed to identify Moses with Irsu, a Shasu who, according to Papyrus Harris I and the Elephantine Stele, took power in Egypt with the support of "Asiatics" (people from the Levant) after the death of Queen Twosret; after coming to power, Irsu and his supporters disrupted Egyptian rituals, "treating the gods like the people" and halting offerings to the Egyptian deities. They were eventually defeated and expelled by the new Pharaoh Setnakhte and, while fleeing, they abandoned large quantities of gold and silver they had stolen from the temples.

projected-00080381-001

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

Health

History

Health, according to the World Health Organization, is "a state of complete physical, mental and social well-being and not merely the absence of disease and infirmity". A variety of definitions have been used for different purposes over time. Health can be promoted by encouraging healthful activities, such as regular physical exercise and adequate sleep, and by reducing or avoiding unhealthful activities or situations, such as smoking or excessive stress. Some factors affecting health are due to individual choices, such as whether to engage in a high-risk behavior, while others are due to structural causes, such as whether the society is arranged in a way that makes it easier or harder for people to get necessary healthcare services. Still, other factors are beyond both individual and group choices, such as genetic disorders.

The meaning of health has evolved over time. In keeping with the biomedical perspective, early definitions of health focused on the theme of the body's ability to function; health was seen as a state of normal function that could be disrupted from time to time by disease. An example of such a definition of health is: "a state characterized by anatomic, physiologic, and psychological integrity; ability to perform personally valued family, work, and community roles; ability to deal with physical, biological, psychological, and social stress". Then, in 1948, in a radical departure from previous definitions, the World Health Organization (WHO) proposed a definition that aimed higher, linking health to well-being, in terms of "physical, mental, and social well-being, and not merely the absence of disease and infirmity". Although this definition was welcomed by some as being innovative, it was also criticized for being vague and excessively broad and was not construed as measurable. For a long time, it was set aside as an impractical ideal, with most discussions of health returning to the practicality of the biomedical model. Just as there was a shift from viewing disease as a state to thinking of it as a process, the same shift happened in definitions of health. Again, the WHO played a leading role when it fostered the development of the health promotion movement in the 1980s. This brought in a new conception of health, not as a state, but in dynamic terms of resiliency, in other words, as "a resource for living". In 1984, WHO revised the definition of health defined it as "the extent to which an individual or group is able to realize aspirations and satisfy needs and to change or cope with the environment. Health is a resource for everyday life, not the objective of living; it is a positive concept, emphasizing social and personal resources, as well as physical capacities." Thus, health referred to the ability to maintain homeostasis and recover from adverse events. Mental, intellectual, emotional and social health referred to a person's ability to handle stress, to acquire skills, to maintain relationships, all of which form resources for resiliency and independent living. This opens up many possibilities for health to be taught, strengthened and learned. Since the late 1970s, the federal Healthy People Program has been a visible component of the United States’ approach to improving population health. In each decade, a new version of Healthy People is issued, featuring updated goals and identifying topic areas and quantifiable objectives for health improvement during the succeeding ten years, with assessment at that point of progress or lack thereof. Progress has been limited to many objectives, leading to concerns about the effectiveness of Healthy People in shaping outcomes in the context of a decentralized and uncoordinated US health system. Healthy People 2020 gives more prominence to health promotion and preventive approaches and adds a substantive focus on the importance of addressing social determinants of health. A new expanded digital interface facilitates use and dissemination rather than bulky printed books as produced in the past. The impact of these changes to Healthy People will be determined in the coming years. Systematic activities to prevent or cure health problems and promote good health in humans are undertaken by health care providers. Applications with regard to animal health are covered by the veterinary sciences. The term "healthy" is also widely used in the context of many types of non-living organizations and their impacts for the benefit of humans, such as in the sense of healthy communities, healthy cities or healthy environments. In addition to health care interventions and a person's surroundings, a number of other factors are known to influence the health status of individuals. These are referred to as the "determinants of health", which include the individual's background, lifestyle, economic status, social conditions and spirituality; Studies have shown that high levels of stress can affect human health. In the first decade of the 21st century, the conceptualization of health as an ability opened the door for self-assessments to become the main indicators to judge the performance of efforts aimed at improving human health. It also created the opportunity for every person to feel healthy, even in the presence of multiple chronic diseases or a terminal condition, and for the re-examination of determinants of health (away from the traditional approach that focuses on the reduction of the prevalence of diseases).

projected-00080381-004

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

Health

Mental health

Health, according to the World Health Organization, is "a state of complete physical, mental and social well-being and not merely the absence of disease and infirmity". A variety of definitions have been used for different purposes over time. Health can be promoted by encouraging healthful activities, such as regular physical exercise and adequate sleep, and by reducing or avoiding unhealthful activities or situations, such as smoking or excessive stress. Some factors affecting health are due to individual choices, such as whether to engage in a high-risk behavior, while others are due to structural causes, such as whether the society is arranged in a way that makes it easier or harder for people to get necessary healthcare services. Still, other factors are beyond both individual and group choices, such as genetic disorders.

The World Health Organization describes mental health as "a state of well-being in which the individual realizes his or her own abilities, can cope with the normal stresses of life, can work productively and fruitfully, and is able to make a contribution to his or her community". Mental health is not just the absence of mental illness. Mental illness is described as 'the spectrum of cognitive, emotional, and behavioral conditions that interfere with social and emotional well-being and the lives and productivity of people. Having a mental illness can seriously impair, temporarily or permanently, the mental functioning of a person. Other terms include: 'mental health problem', 'illness', 'disorder', 'dysfunction'. Approximately twenty percent of all adults in the US are considered diagnosable with a mental illness. Mental illnesses are the leading cause of disability in the US and Canada. Examples of these illnesses include schizophrenia, ADHD, major depressive disorder, bipolar disorder, anxiety disorder, post-traumatic stress disorder and autism.  Many factors contribute to mental health problems, including: Biological factors, such as genes or brain chemistry Life experiences, such as trauma or abuse Family history of mental health problems

projected-05791492-002

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

Vegetable

Terminology

Vegetables are parts of plants that are consumed by humans or other animals as food. The original meaning is still commonly used and is applied to plants collectively to refer to all edible plant matter, including the flowers, fruits, stems, leaves, roots, and seeds. An alternative definition of the term is applied somewhat arbitrarily, often by culinary and cultural tradition. It may exclude foods derived from some plants that are fruits, flowers, nuts, and cereal grains, but include savoury fruits such as tomatoes and courgettes, flowers such as broccoli, and seeds such as pulses. Originally, vegetables were collected from the wild by hunter-gatherers and entered cultivation in several parts of the world, probably during the period 10,000 BC to 7,000 BC, when a new agricultural way of life developed. At first, plants which grew locally would have been cultivated, but as time went on, trade brought exotic crops from elsewhere to add to domestic types. Nowadays, most vegetables are grown all over the world as climate permits, and crops may be cultivated in protected environments in less suitable locations. China is the largest producer of vegetables, and global trade in agricultural products allows consumers to purchase vegetables grown in faraway countries. The scale of production varies from subsistence farmers supplying the needs of their family for food, to agribusinesses with vast acreages of single-product crops. Depending on the type of vegetable concerned, harvesting the crop is followed by grading, storing, processing, and marketing. Vegetables can be eaten either raw or cooked and play an important role in human nutrition, being mostly low in fat and carbohydrates, but high in vitamins, minerals and dietary fiber. Many nutritionists encourage people to consume plenty of fruit and vegetables, five or more portions a day often being recommended.

The exact definition of "vegetable" may vary simply because of the many parts of a plant consumed as food worldwide—roots, stems, leaves, flowers, fruits, and seeds. The broadest definition is the word's use adjectivally to mean "matter of plant origin". More specifically, a vegetable may be defined as "any plant, part of which is used for food", a secondary meaning then being "the edible part of such a plant". A more precise definition is "any plant part consumed for food that is not a fruit or seed, but including mature fruits that are eaten as part of a main meal". Falling outside these definitions are edible fungi (such as edible mushrooms) and edible seaweed which, although not parts of plants, are often treated as vegetables. In the latter-mentioned definition of "vegetable", which is used in everyday language, the words "fruit" and "vegetable" are mutually exclusive. "Fruit" has a precise botanical meaning, being a part that developed from the ovary of a flowering plant. This is considerably different from the word's culinary meaning. While peaches, plums, and oranges are "fruit" in both senses, many items commonly called "vegetables", such as eggplants, bell peppers, and tomatoes, are botanically fruits. The question of whether the tomato is a fruit or a vegetable found its way into the United States Supreme Court in 1893. The court ruled unanimously in Nix v. Hedden that a tomato is correctly identified as, and thus taxed as, a vegetable, for the purposes of the Tariff of 1883 on imported produce. The court did acknowledge, however, that, botanically speaking, a tomato is a fruit.

wit-train-topic-003908184

projected-05791492-003

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

Vegetable

History

Vegetables are parts of plants that are consumed by humans or other animals as food. The original meaning is still commonly used and is applied to plants collectively to refer to all edible plant matter, including the flowers, fruits, stems, leaves, roots, and seeds. An alternative definition of the term is applied somewhat arbitrarily, often by culinary and cultural tradition. It may exclude foods derived from some plants that are fruits, flowers, nuts, and cereal grains, but include savoury fruits such as tomatoes and courgettes, flowers such as broccoli, and seeds such as pulses. Originally, vegetables were collected from the wild by hunter-gatherers and entered cultivation in several parts of the world, probably during the period 10,000 BC to 7,000 BC, when a new agricultural way of life developed. At first, plants which grew locally would have been cultivated, but as time went on, trade brought exotic crops from elsewhere to add to domestic types. Nowadays, most vegetables are grown all over the world as climate permits, and crops may be cultivated in protected environments in less suitable locations. China is the largest producer of vegetables, and global trade in agricultural products allows consumers to purchase vegetables grown in faraway countries. The scale of production varies from subsistence farmers supplying the needs of their family for food, to agribusinesses with vast acreages of single-product crops. Depending on the type of vegetable concerned, harvesting the crop is followed by grading, storing, processing, and marketing. Vegetables can be eaten either raw or cooked and play an important role in human nutrition, being mostly low in fat and carbohydrates, but high in vitamins, minerals and dietary fiber. Many nutritionists encourage people to consume plenty of fruit and vegetables, five or more portions a day often being recommended.

Before the advent of agriculture, humans were hunter-gatherers. They foraged for edible fruit, nuts, stems, leaves, corms, and tubers and hunted animals for food. Forest gardening in a tropical jungle clearing is thought to be the first example of agriculture; useful plant species were identified and encouraged to grow while undesirable species were removed. Plant breeding through the selection of strains with desirable traits such as large fruit and vigorous growth soon followed. While the first evidence for the domestication of grasses such as wheat and barley has been found in the Fertile Crescent in the Middle East, it is likely that various peoples around the world started growing crops in the period 10,000 BC to 7,000 BC. Subsistence agriculture continues to this day, with many rural farmers in Africa, Asia, South America, and elsewhere using their plots of land to produce enough food for their families, while any surplus produce is used for exchange for other goods. Throughout recorded history, the rich have been able to afford a varied diet including meat, vegetables and fruit, but for poor people, meat was a luxury and the food they ate was very dull, typically comprising mainly some staple product made from rice, rye, barley, wheat, millet or maize. The addition of vegetable matter provided some variety to the diet. The staple diet of the Aztecs in Central America was maize and they cultivated tomatoes, avocados, beans, peppers, pumpkins, squashes, peanuts, and amaranth seeds to supplement their tortillas and porridge. In Peru, the Incas subsisted on maize in the lowlands and potatoes at higher altitudes. They also used seeds from quinoa, supplementing their diet with peppers, tomatoes, and avocados. In Ancient China, rice was the staple crop in the south and wheat in the north, the latter made into dumplings, noodles, and pancakes. Vegetables used to accompany these included yams, soybeans, broad beans, turnips, spring onions, and garlic. The diet of the ancient Egyptians was based on bread, often contaminated with sand which wore away their teeth. Meat was a luxury but fish was more plentiful. These were accompanied by a range of vegetables including marrows, broad beans, lentils, onions, leeks, garlic, radishes, and lettuces. The mainstay of the Ancient Greek diet was bread, and this was accompanied by goat's cheese, olives, figs, fish, and occasionally meat. The vegetables grown included onions, garlic, cabbages, melons, and lentils. In Ancient Rome, a thick porridge was made of emmer wheat or beans, accompanied by green vegetables but little meat, and fish was not esteemed. The Romans grew broad beans, peas, onions and turnips and ate the leaves of beets rather than their roots.

projected-00019728-001

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

Marriage

Etymology

Marriage, also called matrimony or wedlock, is a culturally and often legally recognized union between people called spouses. It establishes rights and obligations between them, as well as between them and their children, and between them and their in-laws. It is considered a cultural universal, but the definition of marriage varies between cultures and religions, and over time. Typically, it is an institution in which interpersonal relationships, usually sexual, are acknowledged or sanctioned. In some cultures, marriage is recommended or considered to be compulsory before pursuing any sexual activity. A marriage ceremony is called a wedding. Individuals may marry for several reasons, including legal, social, libidinal, emotional, financial, spiritual, and religious purposes. Whom they marry may be influenced by gender, socially determined rules of incest, prescriptive marriage rules, parental choice, and individual desire. In some areas of the world, arranged marriage, child marriage, polygamy, and forced marriage are practiced. In other areas, such practices are outlawed to preserve women's rights or children's rights (both female and male) or as a result of international law. In some parts of the world, marriage has historically restricted the rights of women, who are (or were) considered the property of the husband. Around the world, primarily in developed democracies, there has been a general trend towards ensuring equal rights for women within marriage (including abolishing coverture, liberalizing divorce laws, and reforming reproductive and sexual rights) and legally recognizing the marriages of interfaith, interracial/interethnic/inter-caste and same-sex couples. Controversies continue regarding the legal status of married women, leniency towards violence within marriage, customs such as dowry and bride price, forced marriage, marriageable age, and criminalization of premarital and extramarital sex. Female age at marriage has proven to be a strong indicator for female autonomy and is continuously used by economic history research. Marriage can be recognized by a state, an organization, a religious authority, a tribal group, a local community, or peers. It is often viewed as a contract. A religious marriage is performed by a religious institution to recognize and create the rights and obligations intrinsic to matrimony in that religion. Religious marriage is known variously as sacramental marriage in Catholicism, nikah in Islam, nissuin in Judaism, and various other names in other faith traditions, each with their own constraints as to what constitutes, and who can enter into, a valid religious marriage.

The word "marriage" derives from Middle English mariage, which first appears in 1250–1300 CE. This, in turn, is derived from Old French, marier (to marry), and ultimately Latin, marītāre, meaning to provide with a husband or wife and marītāri meaning to get married. The adjective marīt-us -a, -um meaning matrimonial or nuptial could also be used in the masculine form as a noun for "husband" and in the feminine form for "wife". The related word "matrimony" derives from the Old French word matremoine, which appears around 1300 CE and ultimately derives from Latin mātrimōnium, which combines the two concepts: mater meaning "mother" and the suffix -monium signifying "action, state, or condition".

projected-00019881-014

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

Management

History

Management (or managing) is the administration of an organization, whether it is a business, a non-profit organization, or a government body. It is the art and science of managing resources of the business. Management includes the activities of setting the strategy of an organization and coordinating the efforts of its employees (or of volunteers) to accomplish its objectives through the application of available resources, such as financial, natural, technological, and human resources. "Run the business" and "Change the business" are two concepts that are used in management to differentiate between the continued delivery of goods or services and adapting of goods or services to meet the changing needs of customers - see trend. The term "management" may also refer to those people who manage an organization—managers. Some people study management at colleges or universities; major degrees in management includes the Bachelor of Commerce (B.Com.), Bachelor of Business Administration (BBA.), Master of Business Administration (MBA.), Master in Management (MSM or MIM) and, for the public sector, the Master of Public Administration (MPA) degree. Individuals who aim to become management specialists or experts, management researchers, or professors may complete the Doctor of Management (DM), the Doctor of Business Administration (DBA), or the PhD in Business Administration or Management. In the past few decades, there has been a movement for evidence-based management. Larger organizations generally have three hierarchical levels of managers, in a pyramid structure: Senior managers such as members of a board of directors and a chief executive officer (CEO) or a president of an organization sets the strategic goals and policy of the organization and make decisions on how the overall organization will operate. Senior managers are generally executive-level professionals who provide direction to middle management, and directly or indirectly report to them. Middle managers such as branch managers, regional managers, department managers, and section managers, who provide direction to the front-line managers. They communicate the strategic goals and policy of senior management to the front-line managers. Line managers such as supervisors and front-line team leaders, oversee the work of regular employees (or volunteers, in some voluntary organizations) and provide direction on their work. Line managers often perform the managerial functions that are traditionally considered as the core of management. Despite the name, they are usually considered part of the workforce and not part of the organization's management class. In smaller organizations, a manager may have a much wider scope and may perform several roles or even all of the roles commonly observed in a large organization. Social scientists study management as an academic discipline, investigating areas such as social organization, organizational adaptation, and organizational leadership.

Some see management as a late-modern (in the sense of late modernity) conceptualization. On those terms it cannot have a pre-modern history – only harbingers (such as stewards). Others, however, detect management-like thought among ancient Sumerian traders and the builders of the pyramids of ancient Egypt. Slave-owners through the centuries faced the problems of exploiting/motivating a dependent but sometimes unenthusiastic or recalcitrant workforce, but many pre-industrial enterprises, given their small scale, did not feel compelled to face the issues of management systematically. However, innovations such as the spread of Arabic numerals (5th to 15th centuries) and the codification of double-entry book-keeping (1494) provided tools for management assessment, planning and control. An organisation is more stable if members have the right to express their differences and solve their conflicts within it. While one person can begin an organisation, "it is lasting when it is left in the care of many and when many desire to maintain it". A weak manager can follow a strong one, but not another weak one, and maintain authority. A manager seeking to change an established organization "should retain at least a shadow of the ancient customs". With the changing workplaces of industrial revolutions in the 18th and 19th centuries, military theory and practice contributed approaches to managing the newly popular factories. Given the scale of most commercial operations and the lack of mechanized record-keeping and recording before the industrial revolution, it made sense for most owners of enterprises in those times to carry out management functions by and for themselves. But with growing size and complexity of organizations, a distinction between owners (individuals, industrial dynasties or groups of shareholders) and day-to-day managers (independent specialists in planning and control) gradually became more common.

projected-00020381-017

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

Mining

Processing

Mining is the extraction of valuable minerals or other geological materials from the Earth, usually from an ore body, lode, vein, seam, reef, or placer deposit. The exploitation of these deposits for raw material is based on the economic viability of investing in the equipment, labor, and energy required to extract, refine and transport the materials found at the mine to manufacturers who can use the material. Ores recovered by mining include metals, coal, oil shale, gemstones, limestone, chalk, dimension stone, rock salt, potash, gravel, and clay. Mining is required to obtain most materials that cannot be grown through agricultural processes, or feasibly created artificially in a laboratory or factory. Mining in a wider sense includes extraction of any non-renewable resource such as petroleum, natural gas, or even water. Modern mining processes involve prospecting for ore bodies, analysis of the profit potential of a proposed mine, extraction of the desired materials, and final reclamation or restoration of the land after the mine is closed. Mining operations can create a negative environmental impact, both during the mining activity and after the mine has closed. Hence, most of the world's nations have passed regulations to decrease the impact; however, the outsized role of mining in generating business for often rural, remote or economically depressed communities means that governments may fail to fully enforce such regulations. Work safety has long been a concern as well, and where enforcing modern practices have significantly improved safety in mines. Moreover, unregulated or poorly regulated mining, especially in developing economies, frequently contributes to local human rights violations and resource conflicts.

Once the mineral is extracted, it is often then processed. The science of extractive metallurgy is a specialized area in the science of metallurgy that studies the extraction of valuable metals from their ores, especially through chemical or mechanical means. Mineral processing (or mineral dressing) is a specialized area in the science of metallurgy that studies the mechanical means of crushing, grinding, and washing that enable the separation (extractive metallurgy) of valuable metals or minerals from their gangue (waste material). Processing of placer ore material consists of gravity-dependent methods of separation, such as sluice boxes. Only minor shaking or washing may be necessary to disaggregate (unclump) the sands or gravels before processing. Processing of ore from a lode mine, whether it is a surface or subsurface mine, requires that the rock ore be crushed and pulverized before extraction of the valuable minerals begins. After lode ore is crushed, recovery of the valuable minerals is done by one, or a combination of several, mechanical and chemical techniques. Since most metals are present in ores as oxides or sulfides, the metal needs to be reduced to its metallic form. This can be accomplished through chemical means such as smelting or through electrolytic reduction, as in the case of aluminium. Geometallurgy combines the geologic sciences with extractive metallurgy and mining. In 2018, led by Chemistry and Biochemistry professor Bradley D. Smith, University of Notre Dame researchers "invented a new class of molecules whose shape and size enable them to capture and contain precious metal ions," reported in a study published by the Journal of the American Chemical Society. The new method "converts gold-containing ore into chloroauric acid and extracts it using an industrial solvent. The container molecules are able to selectively separate the gold from the solvent without the use of water stripping." The newly developed molecules can eliminate water stripping, whereas mining traditionally "relies on a 125-year-old method that treats gold-containing ore with large quantities of poisonous sodium cyanide... this new process has a milder environmental impact and that, besides gold, it can be used for capturing other metals such as platinum and palladium," and could also be used in urban mining processes that remove precious metals from wastewater streams.

projected-00082285-002

https://en.wikipedia.org/wiki/Mathematical%20proof

Mathematical proof

Nature and purpose

A mathematical proof is an inferential argument for a mathematical statement, showing that the stated assumptions logically guarantee the conclusion. The argument may use other previously established statements, such as theorems; but every proof can, in principle, be constructed using only certain basic or original assumptions known as axioms, along with the accepted rules of inference. Proofs are examples of exhaustive deductive reasoning which establish logical certainty, to be distinguished from empirical arguments or non-exhaustive inductive reasoning which establish "reasonable expectation". Presenting many cases in which the statement holds is not enough for a proof, which must demonstrate that the statement is true in all possible cases. A proposition that has not been proved but is believed to be true is known as a conjecture, or a hypothesis if frequently used as an assumption for further mathematical work. Proofs employ logic expressed in mathematical symbols, along with natural language which usually admits some ambiguity. In most mathematical literature, proofs are written in terms of rigorous informal logic. Purely formal proofs, written fully in symbolic language without the involvement of natural language, are considered in proof theory. The distinction between formal and informal proofs has led to much examination of current and historical mathematical practice, quasi-empiricism in mathematics, and so-called folk mathematics, oral traditions in the mainstream mathematical community or in other cultures. The philosophy of mathematics is concerned with the role of language and logic in proofs, and mathematics as a language.

As practiced, a proof is expressed in natural language and is a rigorous argument intended to convince the audience of the truth of a statement. The standard of rigor is not absolute and has varied throughout history. A proof can be presented differently depending on the intended audience. In order to gain acceptance, a proof has to meet communal standards of rigor; an argument considered vague or incomplete may be rejected. The concept of proof is formalized in the field of mathematical logic. A formal proof is written in a formal language instead of natural language. A formal proof is a sequence of formulas in a formal language, starting with an assumption, and with each subsequent formula a logical consequence of the preceding ones. This definition makes the concept of proof amenable to study. Indeed, the field of proof theory studies formal proofs and their properties, the most famous and surprising being that almost all axiomatic systems can generate certain undecidable statements not provable within the system. The definition of a formal proof is intended to capture the concept of proofs as written in the practice of mathematics. The soundness of this definition amounts to the belief that a published proof can, in principle, be converted into a formal proof. However, outside the field of automated proof assistants, this is rarely done in practice. A classic question in philosophy asks whether mathematical proofs are analytic or synthetic. Kant, who introduced the analytic–synthetic distinction, believed mathematical proofs are synthetic, whereas Quine argued in his 1951 "Two Dogmas of Empiricism" that such a distinction is untenable. Proofs may be admired for their mathematical beauty. The mathematician Paul Erdős was known for describing proofs which he found to be particularly elegant as coming from "The Book", a hypothetical tome containing the most beautiful method(s) of proving each theorem. The book Proofs from THE BOOK, published in 2003, is devoted to presenting 32 proofs its editors find particularly pleasing.

projected-00020580-025

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

Motion

Types of motion

In physics, motion is the phenomenon in which an object changes its position with respect to time. Motion is mathematically described in terms of displacement, distance, velocity, acceleration, speed and frame of reference to an observer and measuring the change in position of the body relative to that frame with change in time. The branch of physics describing the motion of objects without reference to its cause is called kinematics, while the branch studying forces and their effect on motion is called dynamics. If an object is not changing relative to a given frame of reference, the object is said to be at rest, motionless, immobile, stationary, or to have a constant or time-invariant position with reference to its surroundings. Modern physics holds that, as there is no absolute frame of reference, Newton's concept of absolute motion cannot be determined. As such, everything in the universe can be considered to be in motion. Motion applies to various physical systems: objects, bodies, matter particles, matter fields, radiation, radiation fields, radiation particles, curvature, and space-time. One can also speak on the motion of images, shapes, and boundaries. In general, the term motion signifies a continuous change in the positions or configuration of a physical system in space. For example, one can talk about the motion of a wave or the motion of a quantum particle, where the configuration consists of probabilities of the wave or particle occupying specific positions.

Simple harmonic motion – motion in which the body oscillates in such a way that the restoring force acting on it is directly proportional to the body's displacement. Mathematically Force is directly proportional to the negative of displacement. Negative sign signifies the restoring nature of the force. (e.g., that of a pendulum). Linear motion – motion which follows a straight linear path, and whose displacement is exactly the same as its trajectory. [Also known as rectilinear motion] Reciprocal motion Brownian motion (i.e. the random movement of particles) Circular motion Rotatory motion – a motion about a fixed point. (e.g. Ferris wheel). Curvilinear motion – It is defined as the motion along a curved path that may be planar or in three dimensions. Rolling motion – (as of the wheel of a bicycle) Oscillatory – (swinging from side to side) Vibratory motion Combination (or simultaneous) motions – Combination of two or more above listed motions Projectile motion – uniform horizontal motion + vertical accelerated motion

projected-00021021-001

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

Mecca

Etymology

Mecca , officially Makkah al-Mukarramah and commonly shortened to Makkah is a city and administrative center of the Mecca Province of Saudi Arabia, and the holiest city in Islam. It is inland from Jeddah on the Red Sea, in a narrow valley above sea level. Its last recorded population was 1,578,722 in 2015. Its estimated metro population in 2020 is 2.042million, making it the third-most populated city in Saudi Arabia after Riyadh and Jeddah. Pilgrims more than triple this number every year during the pilgrimage, observed in the twelfth Hijri month of . Mecca is generally considered "the fountainhead and cradle of Islam". Mecca is revered in Islam as the birthplace of the Islamic prophet Muhammad. The Hira cave atop the ("Mountain of Light"), just outside the city, is where Muslims believe the Quran was first revealed to Muhammad. Visiting Mecca for the is an obligation upon all able Muslims. The Great Mosque of Mecca, known as the , is home to the Ka'bah, believed by Muslims to have been built by Abraham and Ishmael. It is one of Islam's holiest sites and the direction of prayer for all Muslims (). Muslim rulers from in and around the region long tried to take the city and keep it in their control, and thus, much like most of the Hejaz region, the city has seen several regime changes. The city was most recently conquered in the Saudi conquest of Hejaz by Ibn Saud and his allies in 1925. Since then, Mecca has seen a tremendous expansion in size and infrastructure, with newer, modern buildings such as the Abraj Al Bait, the world's fourth-tallest building and third-largest by floor area, towering over the Great Mosque. The Saudi government has also carried out the destruction of several historical structures and archaeological sites, such as the Ajyad Fortress. Non-Muslims are strictly prohibited from entering the city. Under the Saudi government, Mecca is governed by the Mecca Regional Municipality, a municipal council of 14 locally elected members headed by the mayor (called in Arabic) appointed by the Saudi government. In 2015, the mayor of the city was Osama bin Fadhel Al-Barr; , mayor of is Saleh Al-Turki. The City of Mecca , which constitutes Mecca and the surrounding region, is the capital of the Mecca Province, which includes the neighbouring cities of Jeddah and Ta'if, even though Jeddah is considerably larger in population compared to Mecca. The Provincial Governor of the province from 16 May 2007 was Prince Khalid bin Faisal Al Saud.

Mecca has been referred to by many names. As with many Arabic words, its etymology is obscure. Widely believed to be a synonym for , it is said to be more specifically the early name for the valley located therein, while Muslim scholars generally use it to refer to the sacred area of the city that immediately surrounds and includes the Ka'bah.

projected-00021244-001

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

Nile

Etymology

The Nile is a major north-flowing river in northeastern Africa. It flows into the Mediterranean Sea. The Nile is the longest river in Africa and has historically been considered the longest river in the world, though this has been contested by research suggesting that the Amazon River is slightly longer. Of the world's major rivers, the Nile is one of the smallest, as measured by annual flow in cubic metres of water. About long, its drainage basin covers eleven countries: the Democratic Republic of the Congo, Tanzania, Burundi, Rwanda, Uganda, Kenya, Ethiopia, Eritrea, South Sudan, Republic of the Sudan, and Egypt. In particular, the Nile is the primary water source of Egypt, Sudan and South Sudan. Additionally, the Nile is an important economic river, supporting agriculture and fishing. The Nile has two major tributaries – the White Nile and the Blue Nile. The White Nile is traditionally considered to be the headwaters stream. However, the Blue Nile is the source of most of the water of the Nile downstream, containing 80% of the water and silt. The White Nile is longer and rises in the Great Lakes region. It begins at Lake Victoria and flows through Uganda and South Sudan. The Blue Nile begins at Lake Tana in Ethiopia and flows into Sudan from the southeast. The two rivers meet at the Sudanese capital of Khartoum. The northern section of the river flows north almost entirely through the Nubian Desert to Cairo and its large delta, and the river flows into the Mediterranean Sea at Alexandria. Egyptian civilization and Sudanese kingdoms have depended on the river and its annual flooding since ancient times. Most of the population and cities of Egypt lie along those parts of the Nile valley north of Aswan Dam. Nearly all the cultural and historical sites of Ancient Egypt developed and are found along river banks. The Nile is, with the Rhône and Po, one of the three Mediterranean rivers with the largest water discharge.

The standard English names "White Nile" and "Blue Nile" refer to the river's source, derived from Arabic names formerly applied to only the Sudanese stretches that meet at Khartoum. In the ancient Egyptian language, the Nile is called Ḥ'pī (Hapy) or Iteru, meaning "river". In Coptic, the word ⲫⲓⲁⲣⲟ, pronounced piaro (Sahidic) or phiaro (Bohairic), means "the river" (lit. p(h).iar-o "the.canal-great"), and comes from the same ancient name. In Nobiin the river is called Áman Dawū, meaning "the great water". In Luganda the river is called Kiira or Kiyira. In Runyoro it is called Kihiira. In Egyptian Arabic, the Nile is called en-Nīl, while in Standard Arabic it is called an-Nīl. In Biblical Hebrew, it is , Ha-Ye'or or , Ha-Shiḥor. The English name Nile and the Arabic names en-Nîl and an-Nîl both derive from the Latin and the Ancient Greek . Beyond that, however, the etymology is disputed. Homer called the river , Aiguptos, but in subsequent periods, Greek authors referred to its lower course as Neilos; this term became generalised for the entire river system. Thus, the name may derive from Ancient Egyptian expression nꜣ rꜣw-ḥꜣw(t) (lit. 'the mouths of the front parts'), which referred specifically to the branches of the Nile transversing the Delta, and would have been pronounced ni-lo-he in the area around Memphis in the 8th century BCE. Hesiod at his Theogony refers to Nilus (Νεῖλος) as one of the Potamoi (river gods), son of Oceanus and Tethys. Another derivation of Nile might be related to the term Nil (; ), which refers to Indigofera tinctoria, one of the original sources of indigo dye. Another may be Nymphaea caerulea, known as "The Sacred Blue Lily of the Nile", which was found scattered over Tutankhamun's corpse when it was excavated in 1922. Another possible etymology derives from the Semitic term Nahal, meaning "river". Old Libyan has the term lilu, meaning water (in modern Berber ilel ⵉⵍⴻⵍ means sea).

projected-14995351-031

https://en.wikipedia.org/wiki/Michael%20Jackson

Michael Jackson

Discography

Michael Joseph Jackson (August 29, 1958 – June 25, 2009) was an American singer, songwriter, dancer, and philanthropist. Dubbed the "King of Pop", he is regarded as one of the most significant cultural figures of the 20th century. Over a four-decade career, his contributions to music, dance, and fashion, along with his publicized personal life, made him a global figure in popular culture. Jackson influenced artists across many music genres; through stage and video performances, he popularized complicated dance moves such as the moonwalk, to which he gave the name, as well as the robot. He is the most awarded individual music artist in history. The eighth child of the Jackson family, Jackson made his professional debut in 1964 with his older brothers Jackie, Tito, Jermaine, and Marlon as a member of the Jackson 5 (later known as the Jacksons). Jackson began his solo career in 1971 while at Motown Records. He became a solo star with his 1979 album Off the Wall. His music videos, including those for "Beat It", "Billie Jean", and "Thriller" from his 1982 album Thriller, are credited with breaking racial barriers and transforming the medium into an artform and promotional tool. He helped propel the success of MTV and continued to innovate with videos for the albums Bad (1987), Dangerous (1991), and HIStory: Past, Present and Future, Book I (1995). Thriller became the best-selling album of all time, while Bad was the first album to produce five U.S. Billboard Hot 100 number-one singles. From the late 1980s, Jackson became a figure of controversy and speculation due to his changing appearance, relationships, behavior, and lifestyle. In 1993, he was accused of sexually abusing the child of a family friend. The lawsuit was settled out of civil court; Jackson was not indicted due to lack of evidence. In 2005, he was tried and acquitted of further child sexual abuse allegations and several other charges. The FBI found no evidence of criminal conduct on Jackson's behalf in either case. In 2009, while preparing for a series of comeback concerts, This Is It, Jackson died from an overdose of propofol administered by his personal physician, Conrad Murray, who was convicted in 2011 of involuntary manslaughter. Jackson is one of the best-selling music artists of all time, with estimated sales of over 400million records worldwide. He had 13 Billboard Hot 100 number-one singles (more than any other male artist in the Hot 100 era) and was the first artist to have a top-ten single in the Billboard Hot 100 in five different decades. He is regarded by the RIAA as the highest-selling individual music artist of all time worldwide. His honors include 15 Grammy Awards, 6 Brit Awards, a Golden Globe Award, and 39 Guinness World Records, including the "Most Successful Entertainer of All Time". Jackson's inductions include the Rock and Roll Hall of Fame (twice), the Vocal Group Hall of Fame, the Songwriters Hall of Fame, the Dance Hall of Fame (the only recording artist to be inducted), and the Rhythm and Blues Music Hall of Fame. In 2016, his estate earned $825million, the highest yearly amount for a celebrity ever recorded by Forbes.

Got to Be There (1972) Ben (1972) Music & Me (1973) Forever, Michael (1975) Off the Wall (1979) Thriller (1982) Bad (1987) Dangerous (1991) HIStory: Past, Present and Future, Book I (1995) Invincible (2001)

projected-14995351-033

https://en.wikipedia.org/wiki/Michael%20Jackson

Michael Jackson

Tours

Michael Joseph Jackson (August 29, 1958 – June 25, 2009) was an American singer, songwriter, dancer, and philanthropist. Dubbed the "King of Pop", he is regarded as one of the most significant cultural figures of the 20th century. Over a four-decade career, his contributions to music, dance, and fashion, along with his publicized personal life, made him a global figure in popular culture. Jackson influenced artists across many music genres; through stage and video performances, he popularized complicated dance moves such as the moonwalk, to which he gave the name, as well as the robot. He is the most awarded individual music artist in history. The eighth child of the Jackson family, Jackson made his professional debut in 1964 with his older brothers Jackie, Tito, Jermaine, and Marlon as a member of the Jackson 5 (later known as the Jacksons). Jackson began his solo career in 1971 while at Motown Records. He became a solo star with his 1979 album Off the Wall. His music videos, including those for "Beat It", "Billie Jean", and "Thriller" from his 1982 album Thriller, are credited with breaking racial barriers and transforming the medium into an artform and promotional tool. He helped propel the success of MTV and continued to innovate with videos for the albums Bad (1987), Dangerous (1991), and HIStory: Past, Present and Future, Book I (1995). Thriller became the best-selling album of all time, while Bad was the first album to produce five U.S. Billboard Hot 100 number-one singles. From the late 1980s, Jackson became a figure of controversy and speculation due to his changing appearance, relationships, behavior, and lifestyle. In 1993, he was accused of sexually abusing the child of a family friend. The lawsuit was settled out of civil court; Jackson was not indicted due to lack of evidence. In 2005, he was tried and acquitted of further child sexual abuse allegations and several other charges. The FBI found no evidence of criminal conduct on Jackson's behalf in either case. In 2009, while preparing for a series of comeback concerts, This Is It, Jackson died from an overdose of propofol administered by his personal physician, Conrad Murray, who was convicted in 2011 of involuntary manslaughter. Jackson is one of the best-selling music artists of all time, with estimated sales of over 400million records worldwide. He had 13 Billboard Hot 100 number-one singles (more than any other male artist in the Hot 100 era) and was the first artist to have a top-ten single in the Billboard Hot 100 in five different decades. He is regarded by the RIAA as the highest-selling individual music artist of all time worldwide. His honors include 15 Grammy Awards, 6 Brit Awards, a Golden Globe Award, and 39 Guinness World Records, including the "Most Successful Entertainer of All Time". Jackson's inductions include the Rock and Roll Hall of Fame (twice), the Vocal Group Hall of Fame, the Songwriters Hall of Fame, the Dance Hall of Fame (the only recording artist to be inducted), and the Rhythm and Blues Music Hall of Fame. In 2016, his estate earned $825million, the highest yearly amount for a celebrity ever recorded by Forbes.

Bad (1987–1989) Dangerous World Tour (1992–1993) HIStory World Tour (1996–1997) MJ & Friends (1999)

projected-00022153-020

https://en.wikipedia.org/wiki/Nuclear%20power

Nuclear power

Economics

Nuclear power is the use of nuclear reactions to produce electricity. Nuclear power can be obtained from nuclear fission, nuclear decay and nuclear fusion reactions. Presently, the vast majority of electricity from nuclear power is produced by nuclear fission of uranium and plutonium in nuclear power plants. Nuclear decay processes are used in niche applications such as radioisotope thermoelectric generators in some space probes such as Voyager 2. Generating electricity from fusion power remains the focus of international research. Most nuclear power plants use thermal reactors with enriched uranium in a once-through fuel cycle. Fuel is removed when the percentage of neutron absorbing atoms becomes so large that a chain reaction can no longer be sustained, typically three years. It is then cooled for several years in on-site spent fuel pools before being transferred to long term storage. The spent fuel, though low in volume, is high-level radioactive waste. While its radioactivity decreases exponentially it must be isolated from the biosphere for hundreds of thousands of years, though newer technologies (like fast reactors) have the potential to reduce this significantly. Because the spent fuel is still mostly fissionable material, some countries (e.g. France and Russia) reprocess their spent fuel by extracting fissile and fertile elements for fabrication in new fuel, although this process is more expensive than producing new fuel from mined uranium. All reactors breed some plutonium-239, which is found in the spent fuel, and because Pu-239 is the preferred material for nuclear weapons, reprocessing is seen as a weapon proliferation risk. The first nuclear power plant was built in the 1950s. The global installed nuclear capacity grew to 100GW in the late 1970s, and then expanded rapidly during the 1980s, reaching 300GW by 1990. The 1979 Three Mile Island accident in the United States and the 1986 Chernobyl disaster in the Soviet Union resulted in increased regulation and public opposition to nuclear plants. These factors, along with high cost of construction, resulted in the global installed capacity only increasing to 390GW by 2022. These plants supplied 2,586 terawatt hours (TWh) of electricity in 2019, equivalent to about 10% of global electricity generation, and were the second-largest low-carbon power source after hydroelectricity. there are 437 civilian fission reactors in the world, with overall capacity of 393GW, 57 under construction and 102 planned, with a combined capacity of 62GW and 96GW, respectively. The United States has the largest fleet of nuclear reactors, generating over 800TWh of zero-emissions electricity per year with an average capacity factor of 92%. Average global capacity factor is 89%. Most new reactors under construction are generation III reactors in Asia. Nuclear power generation causes one of the lowest levels of fatalities per unit of energy generated compared to other energy sources. Coal, petroleum, natural gas and hydroelectricity each have caused more fatalities per unit of energy due to air pollution and accidents. Nuclear power plants emit no greenhouse gases. One of the dangers of nuclear power is the potential for accidents like the Fukushima nuclear disaster in Japan in 2011. There is a debate about nuclear power. Proponents contend that nuclear power is a safe, sustainable energy source that reduces carbon emissions. The anti-nuclear movement contends that nuclear power poses many threats to people and the environment and is too expensive and slow to deploy when compared to alternative sustainable energy sources.

The economics of new nuclear power plants is a controversial subject and multi-billion-dollar investments depend on the choice of energy sources. Nuclear power plants typically have high capital costs for building the plant. For this reason, comparison with other power generation methods is strongly dependent on assumptions about construction timescales and capital financing for nuclear plants. Fuel costs account for about 30 percent of the operating costs, while prices are subject to the market. The high cost of construction is one of the biggest challenges for nuclear power plants. A new 1,100MW plant is estimated to cost between $6 billion to $9 billion. Nuclear power cost trends show large disparity by nation, design, build rate and the establishment of familiarity in expertise. The only two nations for which data is available that saw cost decreases in the 2000s were India and South Korea. Analysis of the economics of nuclear power must also take into account who bears the risks of future uncertainties. As of 2010, all operating nuclear power plants have been developed by state-owned or regulated electric utility monopolies. Many countries have since liberalized the electricity market where these risks, and the risk of cheaper competitors emerging before capital costs are recovered, are borne by plant suppliers and operators rather than consumers, which leads to a significantly different evaluation of the economics of new nuclear power plants. The levelized cost of electricity (LCOE) from a new nuclear power plant is estimated to be 69USD/MWh, according to an analysis by the International Energy Agency and the OECD Nuclear Energy Agency. This represents the median cost estimate for an nth-of-a-kind nuclear power plant to be completed in 2025, at a discount rate of 7%. Nuclear power was found to be the least-cost option among dispatchable technologies. Variable renewables can generate cheaper electricity: the median cost of onshore wind power was estimated to be 50USD/MWh, and utility-scale solar power 56USD/MWh. At the assumed CO2 emission cost of 30USD/ton, power from coal (88USD/MWh) and gas (71USD/MWh) is more expensive than low-carbon technologies. Electricity from long-term operation of nuclear power plants by lifetime extension was found the be the least-cost option, at 32USD/MWh. Measures to mitigate global warming, such as a carbon tax or carbon emissions trading, may favor the economics of nuclear power. Extreme weather events, including events made more severe by climate change, are decreasing all energy source reliability including nuclear energy by a small degree, depending on location siting. New small modular reactors, such as those developed by NuScale Power, are aimed at reducing the investment costs for new construction by making the reactors smaller and modular, so that they can be built in a factory. Certain designs had considerable early positive economics, such as the CANDU, which realized much higher capacity factor and reliability when compared to generation II light water reactors up to the 1990s. Nuclear power plants, though capable of some grid-load following, are typically run as much as possible to keep the cost of the generated electrical energy as low as possible, supplying mostly base-load electricity. Due to the on-line refueling reactor design, PHWRs (of which the CANDU design is a part) continue to hold many world record positions for longest continual electricity generation, often over 800 days. The specific record as of 2019 is held by a PHWR at Kaiga Atomic Power Station, generating electricity continuously for 962 days. Costs not considered in LCOE calculations include funds for research and development, and disasters (the Fukushima disaster is estimated to cost taxpayers ≈$187 billion). Governments were found to in some cases force "consumers to pay upfront for potential cost overruns" or subsidize uneconomic nuclear energy or be required to do so. Nuclear operators are liable to pay for the waste management in the EU. In the U.S. the Congress reportedly decided 40 years ago that the nation, and not private companies, would be responsible for storing radioactive waste with taxpayers paying for the costs. The World Nuclear Waste Report 2019 found that "even in countries in which the polluter-pays-principle is a legal requirement, it is applied incompletely" and notes the case of the German Asse II deep geological disposal facility, where the retrieval of large amounts of waste has to be paid for by taxpayers. Similarly, other forms of energy, including fossil fuels and renewables, have a portion of their costs covered by governments.

wit-train-topic-002367925

projected-21244047-007

https://en.wikipedia.org/wiki/Realism%20%28arts%29

Realism (arts)

Theatre

Realism in the arts is generally the attempt to represent subject matter truthfully, without artificiality and avoiding speculative fiction and supernatural elements. The term is often used interchangeably with naturalism, even though these terms are not synonymous. Naturalism, as an idea relating to visual representation in Western art, seeks to depict objects with the least possible amount of distortion and is tied to the development of linear perspective and illusionism in Renaissance Europe. Realism, while predicated upon naturalistic representation and a departure from the idealization of earlier academic art, refers to a specific art historical movement that originated in France in the aftermath of the French Revolution of 1848. With artists like Gustave Courbet capitalizing on the mundane, ugly or sordid, realism was motivated by the renewed interest in the common man and the rise of leftist politics. The Realist painters rejected Romanticism, which had come to dominate French literature and art, with roots in the late 18th century. In 19th-century Europe, "Naturalism" or the "Naturalist school" was somewhat artificially erected as a term representing a breakaway sub-movement of realism, that attempted (not wholly successfully) to distinguish itself from its parent by its avoidance of politics and social issues, and liked to proclaim a quasi-scientific basis, playing on the sense of "naturalist" as a student of natural history, as the biological sciences were then generally known. There have been various movements invoking realism in the other arts, such as the opera style of verismo, literary realism, theatrical realism, and Italian neorealist cinema.

Theatrical realism is said to have first emerged in European drama in the 19th century as an offshoot of the Industrial Revolution and the age of science. Some also specifically cited the invention of photography as the basis of the realist theater while others view that the association between realism and drama is far older as demonstrated by the principles of dramatic forms such as the presentation of the physical world that closely matches reality. The achievement of realism in the theatre was to direct attention to the social and psychological problems of ordinary life. In its dramas, people emerge as victims of forces larger than themselves, as individuals confronted with a rapidly accelerating world. These pioneering playwrights were unafraid to present their characters as ordinary, impotent, and unable to arrive at answers to their predicaments. This type of art represents what we see with our human eyes. Anton Chekov, for instance, used camera works to reproduce an uninflected slice of life, exposing the rhetorical and suasive character of realistic theatricality. Scholars such as Thomas Postlewait noted that throughout the nineteenth and twentieth centuries, there were numerous joinings of melodramatic and realistic forms and functions, which could be demonstrated in the way melodramatic elements existed in realistic forms and vice versa. In the United States, realism in drama preceded fictional realism by about two decades as theater historians identified the first impetus toward realism during the late 1870s and early 1880s. Its development is also attributed to William Dean Howells and Henry James who served as the spokesmen for realism as well as articulator of its aesthetic principles. The realistic approach to theater collapsed into nihilism and the absurd after World War II.

projected-21244047-008

https://en.wikipedia.org/wiki/Realism%20%28arts%29

Realism (arts)

Cinema

Realism in the arts is generally the attempt to represent subject matter truthfully, without artificiality and avoiding speculative fiction and supernatural elements. The term is often used interchangeably with naturalism, even though these terms are not synonymous. Naturalism, as an idea relating to visual representation in Western art, seeks to depict objects with the least possible amount of distortion and is tied to the development of linear perspective and illusionism in Renaissance Europe. Realism, while predicated upon naturalistic representation and a departure from the idealization of earlier academic art, refers to a specific art historical movement that originated in France in the aftermath of the French Revolution of 1848. With artists like Gustave Courbet capitalizing on the mundane, ugly or sordid, realism was motivated by the renewed interest in the common man and the rise of leftist politics. The Realist painters rejected Romanticism, which had come to dominate French literature and art, with roots in the late 18th century. In 19th-century Europe, "Naturalism" or the "Naturalist school" was somewhat artificially erected as a term representing a breakaway sub-movement of realism, that attempted (not wholly successfully) to distinguish itself from its parent by its avoidance of politics and social issues, and liked to proclaim a quasi-scientific basis, playing on the sense of "naturalist" as a student of natural history, as the biological sciences were then generally known. There have been various movements invoking realism in the other arts, such as the opera style of verismo, literary realism, theatrical realism, and Italian neorealist cinema.

Italian Neorealism was a cinematic movement incorporating elements of realism that developed in post-WWII Italy. Notable Neorealists included Vittorio De Sica, Luchino Visconti, and Roberto Rossellini. Realist films generally focus on social issues. There are two types of realism in film: seamless realism and aesthetic realism. Seamless realism tries to use narrative structures and film techniques to create a "reality effect" to maintain its authenticity. Aesthetic realism, which was first called for by French filmmakers in the 1930s and promoted by Andre Bazin in the 1950s, acknowledges that a "film cannot be fixed to mean what it shows", as there are multiple realisms; as such, these filmmakers use location shooting, natural light and non-professional actors to ensure the viewer can make up her/his own choice based on the film, rather than being manipulated into a "preferred reading". Siegfried Kracauer is also notable for arguing that realism is the most important function of cinema. Aestheticly realist filmmakers use long shots, deep focus and eye-level 90 degree shots to reduce manipulation of what the viewer sees. Italian neorealism filmmakers from after WWII took the existing realist film approaches from France and Italy that emerged in the 1960s and used them to create a politically oriented cinema. French filmmakers made some politically oriented realist films in the 1960s, such as the cinéma vérité and documentary films of Jean Rouch while in the 1950s and 1960s, British, French and German new waves of filmmaking produced "slice-of-life" films (e.g., kitchen sink dramas in the UK).

projected-00022498-001

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

Orbit

History

In celestial mechanics, an orbit is the curved trajectory of an object such as the trajectory of a planet around a star, or of a natural satellite around a planet, or of an artificial satellite around an object or position in space such as a planet, moon, asteroid, or Lagrange point. Normally, orbit refers to a regularly repeating trajectory, although it may also refer to a non-repeating trajectory. To a close approximation, planets and satellites follow elliptic orbits, with the center of mass being orbited at a focal point of the ellipse, as described by Kepler's laws of planetary motion. For most situations, orbital motion is adequately approximated by Newtonian mechanics, which explains gravity as a force obeying an inverse-square law. However, Albert Einstein's general theory of relativity, which accounts for gravity as due to curvature of spacetime, with orbits following geodesics, provides a more accurate calculation and understanding of the exact mechanics of orbital motion.

Historically, the apparent motions of the planets were described by European and Arabic philosophers using the idea of celestial spheres. This model posited the existence of perfect moving spheres or rings to which the stars and planets were attached. It assumed the heavens were fixed apart from the motion of the spheres and was developed without any understanding of gravity. After the planets' motions were more accurately measured, theoretical mechanisms such as deferent and epicycles were added. Although the model was capable of reasonably accurately predicting the planets' positions in the sky, more and more epicycles were required as the measurements became more accurate, hence the model became increasingly unwieldy. Originally geocentric, it was modified by Copernicus to place the Sun at the centre to help simplify the model. The model was further challenged during the 16th century, as comets were observed traversing the spheres. The basis for the modern understanding of orbits was first formulated by Johannes Kepler whose results are summarised in his three laws of planetary motion. First, he found that the orbits of the planets in our Solar System are elliptical, not circular (or epicyclic), as had previously been believed, and that the Sun is not located at the center of the orbits, but rather at one focus. Second, he found that the orbital speed of each planet is not constant, as had previously been thought, but rather that the speed depends on the planet's distance from the Sun. Third, Kepler found a universal relationship between the orbital properties of all the planets orbiting the Sun. For the planets, the cubes of their distances from the Sun are proportional to the squares of their orbital periods. Jupiter and Venus, for example, are respectively about 5.2 and 0.723 AU distant from the Sun, their orbital periods respectively about 11.86 and 0.615 years. The proportionality is seen by the fact that the ratio for Jupiter, 5.23/11.862, is practically equal to that for Venus, 0.7233/0.6152, in accord with the relationship. Idealised orbits meeting these rules are known as Kepler orbits. Isaac Newton demonstrated that Kepler's laws were derivable from his theory of gravitation and that, in general, the orbits of bodies subject to gravity were conic sections (this assumes that the force of gravity propagates instantaneously). Newton showed that, for a pair of bodies, the orbits' sizes are in inverse proportion to their masses, and that those bodies orbit their common center of mass. Where one body is much more massive than the other (as is the case of an artificial satellite orbiting a planet), it is a convenient approximation to take the center of mass as coinciding with the center of the more massive body. Advances in Newtonian mechanics were then used to explore variations from the simple assumptions behind Kepler orbits, such as the perturbations due to other bodies, or the impact of spheroidal rather than spherical bodies. Joseph-Louis Lagrange developed a new approach to Newtonian mechanics emphasizing energy more than force, and made progress on the three-body problem, discovering the Lagrangian points. In a dramatic vindication of classical mechanics, in 1846 Urbain Le Verrier was able to predict the position of Neptune based on unexplained perturbations in the orbit of Uranus. Albert Einstein in his 1916 paper The Foundation of the General Theory of Relativity explained that gravity was due to curvature of space-time and removed Newton's assumption that changes propagate instantaneously. This led astronomers to recognize that Newtonian mechanics did not provide the highest accuracy in understanding orbits. In relativity theory, orbits follow geodesic trajectories which are usually approximated very well by the Newtonian predictions (except where there are very strong gravity fields and very high speeds) but the differences are measurable. Essentially all the experimental evidence that can distinguish between the theories agrees with relativity theory to within experimental measurement accuracy. The original vindication of general relativity is that it was able to account for the remaining unexplained amount in precession of Mercury's perihelion first noted by Le Verrier. However, Newton's solution is still used for most short term purposes since it is significantly easier to use and sufficiently accurate.

wit-test-topic-000029395

projected-19773328-015

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

Mollusca

Classification

Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are known as molluscs or mollusks (). Around 85,000 extant species of molluscs are recognized. The number of fossil species is estimated between 60,000 and 100,000 additional species. The proportion of undescribed species is very high. Many taxa remain poorly studied. Molluscs are the largest marine phylum, comprising about 23% of all the named marine organisms. Numerous molluscs also live in freshwater and terrestrial habitats. They are highly diverse, not just in size and anatomical structure, but also in behaviour and habitat. The phylum is typically divided into 7 or 8 taxonomic classes, of which two are entirely extinct. Cephalopod molluscs, such as squid, cuttlefish, and octopuses, are among the most neurologically advanced of all invertebrates—and either the giant squid or the colossal squid is the largest known invertebrate species. The gastropods (snails and slugs) are by far the most numerous molluscs and account for 80% of the total classified species. The three most universal features defining modern molluscs are a mantle with a significant cavity used for breathing and excretion, the presence of a radula (except for bivalves), and the structure of the nervous system. Other than these common elements, molluscs express great morphological diversity, so many textbooks base their descriptions on a "hypothetical ancestral mollusc" (see image below). This has a single, "limpet-like" shell on top, which is made of proteins and chitin reinforced with calcium carbonate, and is secreted by a mantle covering the whole upper surface. The underside of the animal consists of a single muscular "foot". Although molluscs are coelomates, the coelom tends to be small. The main body cavity is a hemocoel through which blood circulates; as such, their circulatory systems are mainly open. The "generalized" mollusc's feeding system consists of a rasping "tongue", the radula, and a complex digestive system in which exuded mucus and microscopic, muscle-powered "hairs" called cilia play various important roles. The generalized mollusc has two paired nerve cords, or three in bivalves. The brain, in species that have one, encircles the esophagus. Most molluscs have eyes, and all have sensors to detect chemicals, vibrations, and touch. The simplest type of molluscan reproductive system relies on external fertilization, but more complex variations occur. Nearly all produce eggs, from which may emerge trochophore larvae, more complex veliger larvae, or miniature adults. The coelomic cavity is reduced. They have an open circulatory system and kidney-like organs for excretion. Good evidence exists for the appearance of gastropods, cephalopods, and bivalves in the Cambrian period, 541–485.4 million years ago. However, the evolutionary history both of molluscs' emergence from the ancestral Lophotrochozoa and of their diversification into the well-known living and fossil forms are still subjects of vigorous debate among scientists. Molluscs have been and still are an important food source for anatomically modern humans. Toxins that can accumulate in certain molluscs under specific conditions create a risk of food poisoning, and many jurisdictions have regulations to reduce this risk. Molluscs have, for centuries, also been the source of important luxury goods, notably pearls, mother of pearl, Tyrian purple dye, and sea silk. Their shells have also been used as money in some preindustrial societies. A handful of mollusc species are sometimes considered hazards or pests for human activities. The bite of the blue-ringed octopus is often fatal, and that of Octopus apollyon causes inflammation that can last over a month. Stings from a few species of large tropical cone shells can also kill, but their sophisticated, though easily produced, venoms have become important tools in neurological research. Schistosomiasis (also known as bilharzia, bilharziosis, or snail fever) is transmitted to humans by water snail hosts, and affects about 200 million people. Snails and slugs can also be serious agricultural pests, and accidental or deliberate introduction of some snail species into new environments has seriously damaged some ecosystems.

Opinions vary about the number of classes of molluscs; for example, the table below shows seven living classes, and two extinct ones. Although they are unlikely to form a clade, some older works combine the Caudofoveata and Solenogasters into one class, the Aplacophora. Two of the commonly recognized "classes" are known only from fossils. Classification into higher taxa for these groups has been and remains problematic. A phylogenetic study suggests the Polyplacophora form a clade with a monophyletic Aplacophora. Additionally, it suggests a sister taxon relationship exists between the Bivalvia and the Gastropoda. Tentaculita may also be in Mollusca (see Tentaculites).

projected-00022706-007

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

Orchestra

Instrumentation

An orchestra (; ) is a large instrumental ensemble typical of classical music, which combines instruments from different families, including bowed string instruments such as the violin, viola, cello, and double bass woodwinds such as the flute, oboe, clarinet, saxophone, and bassoon brass instruments such as the horn, trumpet, trombone, cornet, and tuba percussion instruments such as the timpani, snare drum, bass drum, cymbals, triangle, tambourine, and mallet percussion instruments each grouped in sections. Other instruments such as the piano, harpsichord, and celesta may sometimes appear in a fifth keyboard section or may stand alone as soloist instruments, as may the concert harp and, for performances of some modern compositions, electronic instruments and guitars. A full-size Western orchestra may sometimes be called a or philharmonic orchestra (from Greek phil-, "loving", and "harmony"). The actual number of musicians employed in a given performance may vary from seventy to over one hundred musicians, depending on the work being played and the size of the venue. A (sometimes concert orchestra) is a smaller ensemble of not more than about fifty musicians. Orchestras that specialize in the Baroque music of, for example, Johann Sebastian Bach and George Frideric Handel, or Classical repertoire, such as that of Haydn and Mozart, tend to be smaller than orchestras performing a Romantic music repertoire, such as the symphonies of Johannes Brahms. The typical orchestra grew in size throughout the 18th and 19th centuries, reaching a peak with the large orchestras (of as many as 120 players) called for in the works of Richard Wagner, and later, Gustav Mahler. Orchestras are usually led by a conductor who directs the performance with movements of the hands and arms, often made easier for the musicians to see by use of a conductor's baton. The conductor unifies the orchestra, sets the tempo and shapes the sound of the ensemble. The conductor also prepares the orchestra by leading rehearsals before the public concert, in which the conductor provides instructions to the musicians on their interpretation of the music being performed. The leader of the first violin section – commonly called the concertmaster – also plays an important role in leading the musicians. In the Baroque music era (1600–1750), orchestras were often led by the concertmaster, or by a chord-playing musician performing the basso continuo parts on a harpsichord or pipe organ, a tradition that some 20th century and 21st century early music ensembles continue. Orchestras play a wide range of repertoire, including symphonies, opera and ballet overtures, concertos for solo instruments, and as pit ensembles for operas, ballets, and some types of musical theatre (e.g., Gilbert and Sullivan operettas). Amateur orchestras include those made up of students from an elementary school or a high school, youth orchestras, and community orchestras; the latter two typically being made up of amateur musicians from a particular city or region. The term orchestra derives from the Greek ὀρχήστρα (orchestra), the name for the area in front of a stage in ancient Greek theatre reserved for the Greek chorus.

The typical symphony orchestra consists of four groups of related musical instruments called the woodwinds, brass, percussion, and strings. Other instruments such as the piano and celesta may sometimes be grouped into a fifth section such as a keyboard section or may stand alone, as may the concert harp and electric and electronic instruments. The orchestra, depending on the size, contains almost all of the standard instruments in each group. In the history of the orchestra, its instrumentation has been expanded over time, often agreed to have been standardized by the classical period and Ludwig van Beethoven's influence on the classical model. In the 20th and 21st century, new repertory demands expanded the instrumentation of the orchestra, resulting in a flexible use of the classical-model instruments and newly developed electric and electronic instruments in various combinations. The terms symphony orchestra and philharmonic orchestra may be used to distinguish different ensembles from the same locality, such as the London Symphony Orchestra and the London Philharmonic Orchestra. A symphony or philharmonic orchestra will usually have over eighty musicians on its roster, in some cases over a hundred, but the actual number of musicians employed in a particular performance may vary according to the work being played and the size of the venue. A chamber orchestra is usually a smaller ensemble; a major chamber orchestra might employ as many as fifty musicians, but some are much smaller. Concert orchestra is an alternative term, as in the BBC Concert Orchestra and the RTÉ Concert Orchestra.

projected-00090001-001

https://en.wikipedia.org/wiki/Pre-Columbian%20era

Pre-Columbian era

Historiography

In the history of the Americas, the pre-Columbian era spans from the original settlement of North and South America in the Upper Paleolithic period through European colonization, which began with Christopher Columbus's voyage of 1492. Usually, the era covers the history of Indigenous cultures until significant influence by Europeans. This may have occurred decades or even centuries after Columbus for certain cultures. Many pre-Columbian civilizations were marked by permanent settlements, cities, agriculture, civic and monumental architecture, major earthworks, and complex societal hierarchies. Some of these civilizations had long faded by the time of the first permanent European colonies (c. late 16th–early 17th centuries), and are known only through archaeological investigations and oral history. Other civilizations were contemporary with the colonial period and were described in European historical accounts of the time. A few, such as the Maya civilization, had their own written records. Because many Christian Europeans of the time viewed such texts as pagan, men like Diego de Landa burned them, even while seeking to preserve native histories. Only a few hidden documents have survived in their original languages, while others were transcribed or dictated into Spanish, giving modern historians glimpses of ancient culture and knowledge. Many Indigenous peoples in the Americas continue traditional practices while evolving and adapting to the modern world. The alternative terms precontact, precolonial, or prehistoric Americas are also used; in Hispanic America, the usual term is pre-Hispanic; in Brazil, the term used is pre-Cabraline.

Before the development of archaeology in the 19th century, historians of the pre-Columbian period mainly interpreted the records of the European conquerors and the accounts of early European travelers and antiquaries. It was not until the nineteenth century that the work of people such as John Lloyd Stephens, Eduard Seler and Alfred P. Maudslay, and of institutions such as the Peabody Museum of Archaeology and Ethnology of Harvard University, led to the reconsideration and criticism of the early European sources. Now, the scholarly study of pre-Columbian cultures is most often based on scientific and multidisciplinary methodologies.

projected-00090001-027

https://en.wikipedia.org/wiki/Pre-Columbian%20era

Pre-Columbian era

Agricultural development

In the history of the Americas, the pre-Columbian era spans from the original settlement of North and South America in the Upper Paleolithic period through European colonization, which began with Christopher Columbus's voyage of 1492. Usually, the era covers the history of Indigenous cultures until significant influence by Europeans. This may have occurred decades or even centuries after Columbus for certain cultures. Many pre-Columbian civilizations were marked by permanent settlements, cities, agriculture, civic and monumental architecture, major earthworks, and complex societal hierarchies. Some of these civilizations had long faded by the time of the first permanent European colonies (c. late 16th–early 17th centuries), and are known only through archaeological investigations and oral history. Other civilizations were contemporary with the colonial period and were described in European historical accounts of the time. A few, such as the Maya civilization, had their own written records. Because many Christian Europeans of the time viewed such texts as pagan, men like Diego de Landa burned them, even while seeking to preserve native histories. Only a few hidden documents have survived in their original languages, while others were transcribed or dictated into Spanish, giving modern historians glimpses of ancient culture and knowledge. Many Indigenous peoples in the Americas continue traditional practices while evolving and adapting to the modern world. The alternative terms precontact, precolonial, or prehistoric Americas are also used; in Hispanic America, the usual term is pre-Hispanic; in Brazil, the term used is pre-Cabraline.

Early inhabitants of the Americas developed agriculture, developing and breeding maize (corn) from ears in length to the current size that are familiar today. Potatoes, tomatoes, tomatillos (a husked green tomato), pumpkins, chili peppers, squash, beans, pineapple, sweet potatoes, the grains quinoa and amaranth, cocoa beans, vanilla, onion, peanuts, strawberries, raspberries, blueberries, blackberries, papaya, and avocados were among other plants grown by natives. Over two-thirds of all types of food crops grown worldwide are native to the Americas. Early Indigenous peoples began using fire in a widespread manner. Intentional burning of vegetation was taken up to mimic the effects of natural fires that tended to clear forest understories, thereby making travel easier and facilitating the growth of herbs and berry-producing plants that were important for both food and medicines. This created the Pre-Columbian savannas of North America. While not as widespread as in other areas of the world (Asia, Africa, Europe), indigenous Americans did have livestock. Domesticated turkeys were common in Mesoamerica and in some regions of North America; they were valued for their meat, feathers, and, possibly, eggs. There is documentation of Mesoamericans utilizing hairless dogs, especially the Xoloitzcuintle breed, for their meat. Andean societies had llamas and alpacas for meat and wool, as well as for beasts of burden. Guinea pigs were raised for meat in the Andes. Iguanas and a range of wild animals, such as deer and pecari, were another source of meat in Mexico, Central, and northern South America. By the 15th century, maize had been transmitted from Mexico and was being farmed in the Mississippi embayment, as far as the East Coast of the United States, and as far north as southern Canada. Potatoes were utilized by the Inca, and chocolate was used by the Aztecs.

projected-00022939-007

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

Physics

Philosophy

Physics is the natural science that studies matter, its fundamental constituents, its motion and behavior through space and time, and the related entities of energy and force. Physics is one of the most fundamental scientific disciplines, with its main goal being to understand how the universe behaves. A scientist who specializes in the field of physics is called a physicist. Physics is one of the oldest academic disciplines and, through its inclusion of astronomy, perhaps the oldest. Over much of the past two millennia, physics, chemistry, biology, and certain branches of mathematics were a part of natural philosophy, but during the Scientific Revolution in the 17th century these natural sciences emerged as unique research endeavors in their own right. Physics intersects with many interdisciplinary areas of research, such as biophysics and quantum chemistry, and the boundaries of physics are not rigidly defined. New ideas in physics often explain the fundamental mechanisms studied by other sciences and suggest new avenues of research in these and other academic disciplines such as mathematics and philosophy. Advances in physics often enable advances in new technologies. For example, advances in the understanding of electromagnetism, solid-state physics, and nuclear physics led directly to the development of new products that have dramatically transformed modern-day society, such as television, computers, domestic appliances, and nuclear weapons; advances in thermodynamics led to the development of industrialization; and advances in mechanics inspired the development of calculus.

In many ways, physics stems from ancient Greek philosophy. From Thales' first attempt to characterize matter, to Democritus' deduction that matter ought to reduce to an invariant state the Ptolemaic astronomy of a crystalline firmament, and Aristotle's book Physics (an early book on physics, which attempted to analyze and define motion from a philosophical point of view), various Greek philosophers advanced their own theories of nature. Physics was known as natural philosophy until the late 18th century. By the 19th century, physics was realized as a discipline distinct from philosophy and the other sciences. Physics, as with the rest of science, relies on philosophy of science and its "scientific method" to advance our knowledge of the physical world. The scientific method employs a priori reasoning as well as a posteriori reasoning and the use of Bayesian inference to measure the validity of a given theory. The development of physics has answered many questions of early philosophers but has also raised new questions. Study of the philosophical issues surrounding physics, the philosophy of physics, involves issues such as the nature of space and time, determinism, and metaphysical outlooks such as empiricism, naturalism and realism. Many physicists have written about the philosophical implications of their work, for instance Laplace, who championed causal determinism, and Erwin Schrödinger, who wrote on quantum mechanics. The mathematical physicist Roger Penrose has been called a Platonist by Stephen Hawking, a view Penrose discusses in his book, The Road to Reality. Hawking referred to himself as an "unashamed reductionist" and took issue with Penrose's views.

projected-00022989-001

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

Paris

Etymology

Paris () is the capital and most populous city of France, with an estimated population of 2,165,423 residents in 2019 in an area of more than 105 km² (41 sq mi), making it the 34th most densely populated city in the world in 2020. Since the 17th century, Paris has been one of the world's major centres of finance, diplomacy, commerce, fashion, gastronomy, and science. For its leading role in the arts and sciences, as well as its very early system of street lighting, in the 19th century it became known as "the City of Light". Like London, prior to the Second World War, it was also sometimes called the capital of the world. The City of Paris is the centre of the Île-de-France region, or Paris Region, with an estimated population of 12,262,544 in 2019, or about 19% of the population of France, making the region France's primate city. The Paris Region had a GDP of €739 billion ($743 billion) in 2019, which is the highest in Europe. According to the Economist Intelligence Unit Worldwide Cost of Living Survey, in 2021, Paris was the city with the second-highest cost of living in the world, tied with Singapore, and after Tel Aviv. Paris is a major railway, highway, and air-transport hub served by two international airports: Paris–Charles de Gaulle (the second-busiest airport in Europe) and Paris–Orly. Opened in 1900, the city's subway system, the Paris Métro, serves 5.23 million passengers daily; it is the second-busiest metro system in Europe after the Moscow Metro. Gare du Nord is the 24th-busiest railway station in the world and the busiest located outside Japan, with 262 million passengers in 2015. Paris is especially known for its museums and architectural landmarks: the Louvre received 2.8 million visitors in 2021, despite the long museum closings caused by the COVID-19 virus. The Musée d'Orsay, Musée Marmottan Monet and Musée de l'Orangerie are noted for their collections of French Impressionist art. The Pompidou Centre Musée National d'Art Moderne has the largest collection of modern and contemporary art in Europe and Musée Rodin and Musée Picasso. The historical district along the Seine in the city centre has been classified as a UNESCO World Heritage Site since 1991; popular landmarks there include the Cathedral of Notre Dame de Paris on the Île de la Cité, now closed for renovation after the 15 April 2019 fire. Other popular tourist sites include the Gothic royal chapel of Sainte-Chapelle, also on the Île de la Cité; the Eiffel Tower, constructed for the Paris Universal Exposition of 1889; the Grand Palais and Petit Palais, built for the Paris Universal Exposition of 1900; the Arc de Triomphe on the Champs-Élysées, and the hill of Montmartre with its artistic history and its Basilica of Sacré-Coeur. Paris hosts several United Nations organisations including UNESCO, and other international organisations such as the OECD, the OECD Development Centre, the International Bureau of Weights and Measures, the International Energy Agency, the International Federation for Human Rights, along with European bodies such as the European Space Agency, the European Banking Authority or the European Securities and Markets Authority. The football club Paris Saint-Germain and the rugby union club Stade Français are based in Paris. The 80,000-seat Stade de France, built for the 1998 FIFA World Cup, is located just north of Paris in the neighbouring commune of Saint-Denis. Paris hosts the annual French Open Grand Slam tennis tournament on the red clay of Roland Garros. The city hosted the Olympic Games in 1900, 1924 and will host the 2024 Summer Olympics. The 1938 and 1998 FIFA World Cups, the 2007 Rugby World Cup, as well as the 1960, 1984 and 2016 UEFA European Championships were also held in the city. Every July, the Tour de France bicycle race finishes on the Avenue des Champs-Élysées in Paris.

The ancient oppidum that corresponds to the modern city of Paris was first mentioned in the mid-1st century BC by Julius Caesar as Luteciam Parisiorum ('Lutetia of the Parisii'), and is later attested as Parision in the 5th century AD, then as Paris in 1265. During the Roman period, it was commonly known as Lutetia or Lutecia in Latin, and as Leukotekía in Greek, which is interpreted as either stemming from the Celtic root *lukot- ('mouse'), or from *luto- ('marsh, swamp'), depending on whether the Latin or Greek form is the closest to the original Gaulish name. The name Paris is derived from its early inhabitants, the Parisii (Gaulish: Parisioi), a Gallic tribe from the Iron Age and the Roman period. The meaning of the Gaulish ethnonym remains debated. According to Xavier Delamarre, it may derive from the Celtic root pario- ('cauldron'). Alfred Holder interpreted the name as 'the makers' or 'the commanders', by comparing it to the Welsh peryff ('lord, commander'), both possibly descending from a Proto-Celtic form reconstructed as *kwar-is-io-. Alternatively, Pierre-Yves Lambert proposed to translate Parisii as the 'spear people', by connecting the first element to the Old Irish carr ('spear'), derived from an earlier *kwar-sā. In any case, the city's name is not related to the Paris of Greek mythology. Paris is often referred to as the 'City of Light' (La Ville Lumière), both because of its leading role during the Age of Enlightenment and more literally because Paris was one of the first large European cities to use gas street lighting on a grand scale on its boulevards and monuments. Gas lights were installed on the Place du Carrousel, Rue de Rivoli and Place Vendome in 1829. By 1857, the Grand boulevards were lit. By the 1860s, the boulevards and streets of Paris were illuminated by 56,000 gas lamps. Since the late 19th century, Paris has also been known as Panam(e) () in French slang. Inhabitants are known in English as "Parisians" and in French as Parisiens (). They are also pejoratively called Parigots ().

projected-00023318-035

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

Phosphorus

Biological role

Phosphorus is a chemical element with the symbol P and atomic number 15. Elemental phosphorus exists in two major forms, white phosphorus and red phosphorus, but because it is highly reactive, phosphorus is never found as a free element on Earth. It has a concentration in the Earth's crust of about one gram per kilogram (compare copper at about 0.06 grams). In minerals, phosphorus generally occurs as phosphate. Elemental phosphorus was first isolated as white phosphorus in 1669. White phosphorus emits a faint glow when exposed to oxygen – hence the name, taken from Greek mythology, meaning 'light-bearer' (Latin ), referring to the "Morning Star", the planet Venus. The term phosphorescence, meaning glow after illumination, derives from this property of phosphorus, although the word has since been used for a different physical process that produces a glow. The glow of phosphorus is caused by oxidation of the white (but not red) phosphorus — a process now called chemiluminescence. Together with nitrogen, arsenic, antimony, and bismuth, phosphorus is classified as a pnictogen. Phosphorus is an element essential to sustaining life largely through phosphates, compounds containing the phosphate ion, PO43−. Phosphates are a component of DNA, RNA, ATP, and phospholipids, complex compounds fundamental to cells. Elemental phosphorus was first isolated from human urine, and bone ash was an important early phosphate source. Phosphate mines contain fossils because phosphate is present in the fossilized deposits of animal remains and excreta. Low phosphate levels are an important limit to growth in some aquatic systems. The vast majority of phosphorus compounds mined are consumed as fertilisers. Phosphate is needed to replace the phosphorus that plants remove from the soil, and its annual demand is rising nearly twice as fast as the growth of the human population. Other applications include organophosphorus compounds in detergents, pesticides, and nerve agents.

Inorganic phosphorus in the form of the phosphate is required for all known forms of life. Phosphorus plays a major role in the structural framework of DNA and RNA. Living cells use phosphate to transport cellular energy with adenosine triphosphate (ATP), necessary for every cellular process that uses energy. ATP is also important for phosphorylation, a key regulatory event in cells. Phospholipids are the main structural components of all cellular membranes. Calcium phosphate salts assist in stiffening bones. Biochemists commonly use the abbreviation "Pi" to refer to inorganic phosphate. Every living cell is encased in a membrane that separates it from its surroundings. Cellular membranes are composed of a phospholipid matrix and proteins, typically in the form of a bilayer. Phospholipids are derived from glycerol with two of the glycerol hydroxyl (OH) protons replaced by fatty acids as an ester, and the third hydroxyl proton has been replaced with phosphate bonded to another alcohol. An average adult human contains about 0.7 kg of phosphorus, about 85–90% in bones and teeth in the form of apatite, and the remainder in soft tissues and extracellular fluids (~1%). The phosphorus content increases from about 0.5% by mass in infancy to 0.65–1.1% by mass in adults. Average phosphorus concentration in the blood is about 0.4 g/L, about 70% of that is organic and 30% inorganic phosphates. An adult with healthy diet consumes and excretes about 1–3 grams of phosphorus per day, with consumption in the form of inorganic phosphate and phosphorus-containing biomolecules such as nucleic acids and phospholipids; and excretion almost exclusively in the form of phosphate ions such as and . Only about 0.1% of body phosphate circulates in the blood, paralleling the amount of phosphate available to soft tissue cells.

projected-00023501-010

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

Potato

History

The potato is a starchy tuber of the plant Solanum tuberosum and is a root vegetable native to the Americas. The plant is a perennial in the nightshade family Solanaceae. Wild potato species can be found from the southern United States to southern Chile. The potato was originally believed to have been domesticated by Native Americans independently in multiple locations, but later genetic studies traced a single origin, in the area of present-day southern Peru and extreme northwestern Bolivia. Potatoes were domesticated there approximately 7,000–10,000 years ago, from a species in the Solanum brevicaule complex. In the Andes region of South America, where the species is indigenous, some close relatives of the potato are cultivated. Potatoes were introduced to Europe from the Americas by the Spanish in the second half of the 16th century. Today they are a staple food in many parts of the world and an integral part of much of the world's food supply. , potatoes were the world's fourth-largest food crop after maize (corn), wheat, and rice. Following millennia of selective breeding, there are now over 5,000 different types of potatoes. Over 99% of potatoes presently cultivated worldwide descend from varieties that originated in the lowlands of south-central Chile. The importance of the potato as a food source and culinary ingredient varies by region and is still changing. It remains an essential crop in Europe, especially Northern and Eastern Europe, where per capita production is still the highest in the world, while the most rapid expansion in production since 2000 has occurred in southern and eastern Asia, with China and India leading the world in overall production . Like the tomato, the potato is a nightshade in the genus Solanum, and the vegetative and fruiting parts of the potato contain the toxin solanine which is dangerous for human consumption. Normal potato tubers that have been grown and stored properly produce glycoalkaloids in amounts small enough to be negligible to human health, but, if green sections of the plant (namely sprouts and skins) are exposed to light, the tuber can accumulate a high enough concentration of glycoalkaloids to affect human health. The discovery of acrylamides in starchy foods in 2002 led to international health concerns, but subsequent high-quality evidence showed acrylamide is not likely to cause cancer in humans.

The potato was first domesticated in the region of modern-day southern Peru and northwestern Bolivia by pre-Columbian farmers, around Lake Titicaca. It has since spread around the world and become a staple crop in many countries. The earliest archaeologically verified potato tuber remains have been found at the coastal site of Ancon (central Peru), dating to 2500 BC. The most widely cultivated variety, Solanum tuberosum tuberosum, is indigenous to the Chiloé Archipelago, and has been cultivated by the local indigenous people since before the Spanish conquest. According to conservative estimates, the introduction of the potato was responsible for a quarter of the growth in Old World population and urbanization between 1700 and 1900. In the Altiplano, potatoes provided the principal energy source for the Inca civilization, its predecessors, and its Spanish successor. Following the Spanish conquest of the Inca Empire, the Spanish introduced the potato to Europe in the second half of the 16th century, part of the Columbian exchange. The staple was subsequently conveyed by European (possibly including Russian) mariners to territories and ports throughout the world, especially their colonies. The potato was slow to be adopted by European and colonial farmers, but after 1750 it became an important food staple and field crop and played a major role in the European 19th century population boom. However, lack of genetic diversity, due to the very limited number of varieties initially introduced, left the crop vulnerable to disease. In 1845, a plant disease known as late blight, caused by the fungus-like oomycete Phytophthora infestans, spread rapidly through the poorer communities of western Ireland as well as parts of the Scottish Highlands, resulting in the crop failures that led to the Great Irish Famine. Thousands of varieties still persist in the Andes however, where over 100 cultivars might be found in a single valley, and a dozen or more might be maintained by a single agricultural household.

projected-00023635-004

https://en.wikipedia.org/wiki/Physical%20chemistry

Physical chemistry

Journals

Physical chemistry is the study of macroscopic and microscopic phenomena in chemical systems in terms of the principles, practices, and concepts of physics such as motion, energy, force, time, thermodynamics, quantum chemistry, statistical mechanics, analytical dynamics and chemical equilibria. Physical chemistry, in contrast to chemical physics, is predominantly (but not always) a supra-molecular science, as the majority of the principles on which it was founded relate to the bulk rather than the molecular or atomic structure alone (for example, chemical equilibrium and colloids). Some of the relationships that physical chemistry strives to resolve include the effects of: Intermolecular forces that act upon the physical properties of materials (plasticity, tensile strength, surface tension in liquids). Reaction kinetics on the rate of a reaction. The identity of ions and the electrical conductivity of materials. Surface science and electrochemistry of cell membranes. Interaction of one body with another in terms of quantities of heat and work called thermodynamics. Transfer of heat between a chemical system and its surroundings during change of phase or chemical reaction taking place called thermochemistry Study of colligative properties of number of species present in solution. Number of phases, number of components and degree of freedom (or variance) can be correlated with one another with help of phase rule. Reactions of electrochemical cells. Behaviour of microscopic systems using quantum mechanics and macroscopic systems using statistical thermodynamics.

Some journals that deal with physical chemistry include Zeitschrift für Physikalische Chemie (1887); Journal of Physical Chemistry A (from 1896 as Journal of Physical Chemistry, renamed in 1997); Physical Chemistry Chemical Physics (from 1999, formerly Faraday Transactions with a history dating back to 1905); Macromolecular Chemistry and Physics (1947); Annual Review of Physical Chemistry (1950); Molecular Physics (1957); Journal of Physical Organic Chemistry (1988); Journal of Physical Chemistry B (1997); ChemPhysChem (2000); Journal of Physical Chemistry C (2007); and Journal of Physical Chemistry Letters (from 2010, combined letters previously published in the separate journals) Historical journals that covered both chemistry and physics include Annales de chimie et de physique (started in 1789, published under the name given here from 1815 to 1914).

projected-00092693-010

https://en.wikipedia.org/wiki/Common%20cold

Common cold

Prevention

The common cold, also known simply as a cold, is a viral infectious disease of the upper respiratory tract that primarily affects the respiratory mucosa of the nose, throat, sinuses, and larynx. Signs and symptoms may appear less than two days after exposure to the virus. These may include coughing, sore throat, runny nose, sneezing, headache, and fever. People usually recover in seven to ten days, but some symptoms may last up to three weeks. Occasionally, those with other health problems may develop pneumonia. Well over 200 virus strains are implicated in causing the common cold, with rhinoviruses, coronaviruses, adenoviruses and enteroviruses being the most common. They spread through the air during close contact with infected people or indirectly through contact with objects in the environment, followed by transfer to the mouth or nose. Risk factors include going to child care facilities, not sleeping well, and psychological stress. The symptoms are mostly due to the body's immune response to the infection rather than to tissue destruction by the viruses themselves. The symptoms of influenza are similar to those of a cold, although usually more severe and less likely to include a runny nose. There is no vaccine for the common cold. The primary methods of prevention are hand washing; not touching the eyes, nose or mouth with unwashed hands; and staying away from sick people. Some evidence supports the use of face masks. There is also no cure, but the symptoms can be treated. Zinc may reduce the duration and severity of symptoms if started shortly after the onset of symptoms. Nonsteroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen may help with pain. Antibiotics, however, should not be used, as all colds are caused by viruses, and there is no good evidence that cough medicines are effective. The common cold is the most frequent infectious disease in humans. Under normal circumstances, the average adult gets two to three colds a year, while the average child may get six to eight. Infections occur more commonly during the winter. These infections have existed throughout human history.

The only useful ways to reduce the spread of cold viruses are physical measures such as using correct hand washing technique and face masks; in the healthcare environment, gowns and disposable gloves are also used. Isolation or quarantine is not used as the disease is so widespread and symptoms are non-specific. There is no vaccine to protect against the common cold. Vaccination has proven difficult as there are many viruses involved and they mutate rapidly. Creation of a broadly effective vaccine is, therefore, highly improbable. Regular hand washing appears to be effective in reducing the transmission of cold viruses, especially among children. Whether the addition of antivirals or antibacterials to normal hand washing provides greater benefit is unknown. Wearing face masks when around people who are infected may be beneficial; however, there is insufficient evidence for maintaining a greater social distance. It is unclear if zinc supplements affect the likelihood of contracting a cold. Routine vitamin C supplements do not reduce the risk or severity of the common cold, though they may reduce its duration. Gargling with water was found useful in one small trial.

projected-00092693-018

https://en.wikipedia.org/wiki/Common%20cold

Common cold

Epidemiology

The common cold, also known simply as a cold, is a viral infectious disease of the upper respiratory tract that primarily affects the respiratory mucosa of the nose, throat, sinuses, and larynx. Signs and symptoms may appear less than two days after exposure to the virus. These may include coughing, sore throat, runny nose, sneezing, headache, and fever. People usually recover in seven to ten days, but some symptoms may last up to three weeks. Occasionally, those with other health problems may develop pneumonia. Well over 200 virus strains are implicated in causing the common cold, with rhinoviruses, coronaviruses, adenoviruses and enteroviruses being the most common. They spread through the air during close contact with infected people or indirectly through contact with objects in the environment, followed by transfer to the mouth or nose. Risk factors include going to child care facilities, not sleeping well, and psychological stress. The symptoms are mostly due to the body's immune response to the infection rather than to tissue destruction by the viruses themselves. The symptoms of influenza are similar to those of a cold, although usually more severe and less likely to include a runny nose. There is no vaccine for the common cold. The primary methods of prevention are hand washing; not touching the eyes, nose or mouth with unwashed hands; and staying away from sick people. Some evidence supports the use of face masks. There is also no cure, but the symptoms can be treated. Zinc may reduce the duration and severity of symptoms if started shortly after the onset of symptoms. Nonsteroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen may help with pain. Antibiotics, however, should not be used, as all colds are caused by viruses, and there is no good evidence that cough medicines are effective. The common cold is the most frequent infectious disease in humans. Under normal circumstances, the average adult gets two to three colds a year, while the average child may get six to eight. Infections occur more commonly during the winter. These infections have existed throughout human history.

The common cold is the most common human disease and affects people all over the globe. Adults typically have two to three infections annually, and children may have six to ten colds a year (and up to twelve colds a year for school children). Rates of symptomatic infections increase in the elderly due to declining immunity. Native Americans and Inuit are more likely to be infected with colds and develop complications such as otitis media than Caucasians. This may be explained as much by issues such as poverty and overcrowding as by ethnicity.

projected-00024140-001

https://en.wikipedia.org/wiki/Paul%20the%20Apostle

Paul the Apostle

Names

Paul (previously called Saul of Tarsus; AD), commonly known as Paul the Apostle and Saint Paul, was a Christian apostle who spread the teachings of Jesus in the first-century world. Generally regarded as one of the most important figures of the Apostolic Age, he founded several Christian communities in Asia Minor and Europe from the mid-40s to the mid-50s AD. According to the New Testament book Acts of the Apostles, Paul was a Pharisee. He participated in the persecution of early disciples of Jesus, possibly Hellenised diaspora Jews converted to Christianity, in the area of Jerusalem, prior to his conversion. Some time after having approved of the execution of Stephen, Paul was traveling on the road to Damascus so that he might find any Christians there and bring them "bound to Jerusalem" (ESV). At midday, a light brighter than the sun shone around both him and those with him, causing all to fall to the ground, with the risen Christ verbally addressing Paul regarding his persecution. Having been made blind, along with being commanded to enter the city, his sight was restored three days later by Ananias of Damascus. After these events, Paul was baptized, beginning immediately to proclaim that Jesus of Nazareth was the Jewish messiah and the Son of God. Approximately half of the content in the book of Acts details the life and works of Paul. Fourteen of the 27 books in the New Testament have traditionally been attributed to Paul. Seven of the Pauline epistles are undisputed by scholars as being authentic, with varying degrees of argument about the remainder. Pauline authorship of the Epistle to the Hebrews is not asserted in the Epistle itself and was already doubted in the 2nd and 3rd centuries. It was almost unquestioningly accepted from the 5th to the 16th centuries that Paul was the author of Hebrews, but that view is now almost universally rejected by scholars. The other six are believed by some scholars to have come from followers writing in his name, using material from Paul's surviving letters and letters written by him that no longer survive. Other scholars argue that the idea of a pseudonymous author for the disputed epistles raises many problems. Today, Paul's epistles continue to be vital roots of the theology, worship and pastoral life in the Latin and Protestant traditions of the West, as well as the Eastern Catholic and Orthodox traditions of the East. Paul's influence on Christian thought and practice has been characterized as being as "profound as it is pervasive", among that of many other apostles and missionaries involved in the spread of the Christian faith.

Paul's Jewish name was "Saul" (), perhaps after the biblical King Saul, the first king of Israel and like Paul a member of the Tribe of Benjamin; the Latin name Paul, meaning small, was not a result of his conversion as it is commonly believed but a second name for use in communicating with a Greco-Roman audience. According to the Acts of the Apostles, he was a Roman citizen. As such, he bore the Latin name "Paul" – in Latin and in biblical Greek (). It was typical for the Jews of that time to have two names: one Hebrew, the other Latin or Greek. Jesus called him "Saul, Saul" in "the Hebrew tongue" in the Acts of the Apostles, when he had the vision which led to his conversion on the road to Damascus. Later, in a vision to Ananias of Damascus, "the Lord" referred to him as "Saul, of Tarsus". When Ananias came to restore his sight, he called him "Brother Saul". In Acts 13:9, Saul is called "Paul" for the first time on the island of Cyprus – much later than the time of his conversion. The author of Luke–Acts indicates that the names were interchangeable: "Saul, who also is called Paul." He refers to him as Paul through the remainder of Acts. This was apparently Paul's preference since he is called Paul in all other Bible books where he is mentioned, including those that he authored. Adopting his Roman name was typical of Paul's missionary style. His method was to put people at their ease and to approach them with his message in a language and style to which they could relate, as in 1 Corinthians 9.

projected-00024176-013

https://en.wikipedia.org/wiki/Pablo%20Picasso

Pablo Picasso

Death

Pablo Ruiz Picasso (25 October 1881 – 8 April 1973) was a Spanish painter, sculptor, printmaker, ceramicist and theatre designer who spent most of his adult life in France. One of the most influential artists of the 20th century, he is known for co-founding the Cubist movement, the invention of constructed sculpture, the co-invention of collage, and for the wide variety of styles that he helped develop and explore. Among his most famous works are the proto-Cubist Les Demoiselles d'Avignon (1907), and the anti-war painting Guernica (1937), a dramatic portrayal of the bombing of Guernica by German and Italian air forces during the Spanish Civil War. Picasso demonstrated extraordinary artistic talent in his early years, painting in a naturalistic manner through his childhood and adolescence. During the first decade of the 20th century, his style changed as he experimented with different theories, techniques, and ideas. After 1906, the Fauvist work of the slightly older artist Henri Matisse motivated Picasso to explore more radical styles, beginning a fruitful rivalry between the two artists, who subsequently were often paired by critics as the leaders of modern art. Picasso's work is often categorized into periods. While the names of many of his later periods are debated, the most commonly accepted periods in his work are the Blue Period (1901–1904), the Rose Period (1904–1906), the African-influenced Period (1907–1909), Analytic Cubism (1909–1912), and Synthetic Cubism (1912–1919), also referred to as the Crystal period. Much of Picasso's work of the late 1910s and early 1920s is in a neoclassical style, and his work in the mid-1920s often has characteristics of Surrealism. His later work often combines elements of his earlier styles. Exceptionally prolific throughout the course of his long life, Picasso achieved universal renown and immense fortune for his revolutionary artistic accomplishments, and became one of the best-known figures in 20th-century art.

Pablo Picasso died on 8 April 1973 in Mougins, France, from pulmonary edema and heart failure, while he and his wife Jacqueline entertained friends for dinner. He was interred at the Château of Vauvenargues near Aix-en-Provence, a property he had acquired in 1958 and occupied with Jacqueline between 1959 and 1962. Jacqueline prevented his children Claude and Paloma from attending the funeral. Devastated and lonely after the death of Picasso, Jacqueline killed herself by gunshot in 1986 when she was 59 years old.

projected-00024176-019

https://en.wikipedia.org/wiki/Pablo%20Picasso

Pablo Picasso

Personal life

Pablo Ruiz Picasso (25 October 1881 – 8 April 1973) was a Spanish painter, sculptor, printmaker, ceramicist and theatre designer who spent most of his adult life in France. One of the most influential artists of the 20th century, he is known for co-founding the Cubist movement, the invention of constructed sculpture, the co-invention of collage, and for the wide variety of styles that he helped develop and explore. Among his most famous works are the proto-Cubist Les Demoiselles d'Avignon (1907), and the anti-war painting Guernica (1937), a dramatic portrayal of the bombing of Guernica by German and Italian air forces during the Spanish Civil War. Picasso demonstrated extraordinary artistic talent in his early years, painting in a naturalistic manner through his childhood and adolescence. During the first decade of the 20th century, his style changed as he experimented with different theories, techniques, and ideas. After 1906, the Fauvist work of the slightly older artist Henri Matisse motivated Picasso to explore more radical styles, beginning a fruitful rivalry between the two artists, who subsequently were often paired by critics as the leaders of modern art. Picasso's work is often categorized into periods. While the names of many of his later periods are debated, the most commonly accepted periods in his work are the Blue Period (1901–1904), the Rose Period (1904–1906), the African-influenced Period (1907–1909), Analytic Cubism (1909–1912), and Synthetic Cubism (1912–1919), also referred to as the Crystal period. Much of Picasso's work of the late 1910s and early 1920s is in a neoclassical style, and his work in the mid-1920s often has characteristics of Surrealism. His later work often combines elements of his earlier styles. Exceptionally prolific throughout the course of his long life, Picasso achieved universal renown and immense fortune for his revolutionary artistic accomplishments, and became one of the best-known figures in 20th-century art.

Throughout his life Picasso maintained several mistresses in addition to his wife or primary partner. Picasso was married twice and had four children by three women: Paulo (4 February 1921 – 5 June 1975, Paul Joseph Picasso) – with Olga Khokhlova Maya (born 5 September 1935, Maria de la Concepcion Picasso) – with Marie-Thérèse Walter Claude (born 15 May 1947, Claude Pierre Pablo Picasso) – with Françoise Gilot Paloma (born 19 April 1949, Anne Paloma Picasso) – with Françoise Gilot Photographer and painter Dora Maar was also a constant companion and lover of Picasso. The two were closest in the late 1930s and early 1940s, and it was Maar who documented the painting of Guernica. The women in Picasso's life played an important role in the emotional and erotic aspects of his creative expression, and the tumultuous nature of these relationships has been considered vital to his artistic process. Many of these women functioned as muses for him, and their inclusion in his extensive oeuvre granted them a place in art history. A largely recurring motif in his body of work is the female form. The variations in his relationships informed and collided with his progression of style throughout his career. For example, portraits created of his first wife, Olga, were rendered in a naturalistic style during his Neoclassical period. His relationship with Marie-Thérèse Walter inspired many of his surrealist pieces, as well as what is referred to as his "Year of Wonders". Reappearance of acrobats theme in 1905 put an end to his "Blue Period" and transitioned into his "Rose Period". This transition has been incorrectly attributed to the presence of Fernande Olivier in his life. Picasso has been commonly characterised as a womaniser and a misogynist, being quoted as having said to one of his mistresses, Françoise Gilot, "Women are machines for suffering." He later told her, "For me there are only two kinds of women: goddesses and doormats." In her memoir, Picasso, My Grandfather, Marina Picasso writes of his treatment of women, "He submitted them to his animal sexuality, tamed them, bewitched them, ingested them, and crushed them onto his canvas. After he had spent many nights extracting their essence, once they were bled dry, he would dispose of them." Of the several important women in his life, two, Marie-Thèrése Walter, a mistress, and Jacqueline Roque, his second wife, died by suicide. Others, notably his first wife Olga Khokhlova, and his mistress Dora Maar, succumbed to nervous breakdowns. His son, Paulo, developed a fatal alcoholism due to depression. His grandson, Pablito, also died by suicide that same year by ingesting bleach when he was barred by Jacqueline Roque from attending the artist's funeral.

projected-19828134-018

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

Plant

Genomics

Plants are predominantly photosynthetic eukaryotes of the kingdom Plantae. Historically, the plant kingdom encompassed all living things that were not animals, and included algae and fungi; however, all current definitions of Plantae exclude the fungi and some algae, as well as the prokaryotes (the archaea and bacteria). By one definition, plants form the clade Viridiplantae (Latin name for "green plants") which is sister of the Glaucophyta, and consists of the green algae and Embryophyta (land plants). The latter includes the flowering plants, conifers and other gymnosperms, ferns and their allies, hornworts, liverworts, and mosses. Most plants are multicellular organisms. Green plants obtain most of their energy from sunlight via photosynthesis by primary chloroplasts that are derived from endosymbiosis with cyanobacteria. Their chloroplasts contain chlorophylls a and b, which gives them their green color. Some plants are parasitic or mycotrophic and have lost the ability to produce normal amounts of chlorophyll or to photosynthesize, but still have flowers, fruits, and seeds. Plants are characterized by sexual reproduction and alternation of generations, although asexual reproduction is also common. There are about 320,000 known species of plants, of which the great majority, some 260–290 thousand, produce seeds. Green plants provide a substantial proportion of the world's molecular oxygen, and are the basis of most of Earth's ecosystems. Plants that produce grain, fruit, and vegetables also form basic human foods and have been domesticated for millennia. Plants have many cultural and other uses, as ornaments, building materials, writing material and, in great variety, they have been the source of medicines and psychoactive drugs. The scientific study of plants is known as botany, a branch of biology.

Plants have some of the largest genomes among all organisms. The largest plant genome (in terms of gene number) is that of wheat (Triticum asestivum), predicted to encode ≈94,000 genes and thus almost 5 times as many as the human genome. The first plant genome sequenced was that of Arabidopsis thaliana which encodes about 25,500 genes. In terms of sheer DNA sequence, the smallest published genome is that of the carnivorous bladderwort (Utricularia gibba) at 82 Mb (although it still encodes 28,500 genes) while the largest, from the Norway Spruce (Picea abies), extends over 19,600 Mb (encoding about 28,300 genes).

projected-00024624-002

https://en.wikipedia.org/wiki/Pop%20music

Pop music

Characteristics

Pop music is a genre of popular music that originated in its modern form during the mid-1950s in the United States and the United Kingdom. The terms popular music and pop music are often used interchangeably, although the former describes all music that is popular and includes many disparate styles. During the 1950s and 1960s, pop music encompassed rock and roll and the youth-oriented styles it influenced. Rock and pop music remained roughly synonymous until the late 1960s, after which pop became associated with music that was more commercial, ephemeral, and accessible. Although much of the music that appears on record charts is considered to be pop music, the genre is distinguished from chart music. Identifying factors usually include repeated choruses and hooks, short to medium-length songs written in a basic format (often the verse-chorus structure), and rhythms or tempos that can be easily danced to. Much pop music also borrows elements from other styles such as rock, urban contemporary (R&B/hip-hop), dance, Latin, and country.

According to Frith, characteristics of pop music include an aim of appealing to a general audience, rather than to a particular sub-culture or ideology, and an emphasis on craftsmanship rather than formal "artistic" qualities. Besides, Frith also offers three identifying characteristics of pop music: light entertainment, commercial imperatives, and personal identification. Pop music grew out of a light entertainment/ easy listening tradition. Pop music is more conservative than other music genres such as folk, blues, country, and tradition. Many pop songs do not contain themes of resistance, opposition, or political themes, rather focusing more on love and relationships. Therefore, pop music does not challenge its audiences socially, and does not cause political activism. Frith also said the main purpose of pop music is to create revenue. It is not a medium of free articulation of the people. Instead, pop music seeks to supply the nature of personal desire and achieve the instant empathy with cliche personalities, stereotypes, and melodrama that appeals to listeners. It is mostly about how much revenue pop music makes for record companies. Music scholar Timothy Warner said pop music typically has an emphasis on recording, production, and technology, rather than live performance; a tendency to reflect existing trends rather than progressive developments; and seeks to encourage dancing or uses dance-oriented rhythms. The main medium of pop music is the song, often between two and a half and three and a half minutes in length, generally marked by a consistent and noticeable rhythmic element, a mainstream style and a simple traditional structure. The structure of many popular songs is that of a verse and a chorus, the chorus serving as the portion of the track that is designed to stick in the ear through simple repetition both musically and lyrically. The chorus is often where the music builds towards and is often preceded by "the drop" where the bass and drum parts "drop out". Common variants include the verse-chorus form and the thirty-two-bar form, with a focus on melodies and catchy hooks, and a chorus that contrasts melodically, rhythmically and harmonically with the verse. The beat and the melodies tend to be simple, with limited harmonic accompaniment. The lyrics of modern pop songs typically focus on simple themes – often love and romantic relationships – although there are notable exceptions. Harmony and chord progressions in pop music are often "that of classical European tonality, only more simple-minded." Clichés include the barbershop quartet-style harmony (i.e. ii – V – I) and blues scale-influenced harmony. There was a lessening of the influence of traditional views of the circle of fifths between the mid-1950s and the late 1970s, including less predominance for the dominant function.

projected-00024702-028

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

Peace

Theories

Peace is a concept of societal friendship and harmony in the absence of hostility and violence. In a social sense, peace is commonly used to mean a lack of conflict (such as war) and freedom from fear of violence between individuals or groups. Throughout history, leaders have used peacemaking and diplomacy to establish a type of behavioral restraint that has resulted in the establishment of regional peace or economic growth through various forms of agreements or peace treaties. Such behavioral restraint has often resulted in the reduced conflict, greater economic interactivity, and consequently substantial prosperity. "Psychological peace" (such as peaceful thinking and emotions) is perhaps less well defined, yet often a necessary precursor to establishing "behavioural peace." Peaceful behaviour sometimes results from a "peaceful inner disposition." Some have expressed the belief that peace can be initiated with a certain quality of inner tranquility that does not depend upon the uncertainties of daily life. The acquisition of such a "peaceful internal disposition" for oneself and others can contribute to resolving otherwise seemingly irreconcilable competing interests. Peace is not a state of excitement although we are happy when excited, but peace is when one's mind is quiet and satisfied.

Many different theories of "peace" exist in the world of peace studies, which involves the study of de-escalation, conflict transformation, disarmament, and cessation of violence. The definition of "peace" can vary with religion, culture, or subject of study.

projected-00025202-012

https://en.wikipedia.org/wiki/Quantum%20mechanics

Quantum mechanics

Applications

Quantum mechanics is a fundamental theory in physics that provides a description of the physical properties of nature at the scale of atoms and subatomic particles. It is the foundation of all quantum physics including quantum chemistry, quantum field theory, quantum technology, and quantum information science. Classical physics, the collection of theories that existed before the advent of quantum mechanics, describes many aspects of nature at an ordinary (macroscopic) scale, but is not sufficient for describing them at small (atomic and subatomic) scales. Most theories in classical physics can be derived from quantum mechanics as an approximation valid at large (macroscopic) scale. Quantum mechanics differs from classical physics in that energy, momentum, angular momentum, and other quantities of a bound system are restricted to discrete values (quantization); objects have characteristics of both particles and waves (wave–particle duality); and there are limits to how accurately the value of a physical quantity can be predicted prior to its measurement, given a complete set of initial conditions (the uncertainty principle). Quantum mechanics arose gradually from theories to explain observations which could not be reconciled with classical physics, such as Max Planck's solution in 1900 to the black-body radiation problem, and the correspondence between energy and frequency in Albert Einstein's 1905 paper which explained the photoelectric effect. These early attempts to understand microscopic phenomena, now known as the "old quantum theory", led to the full development of quantum mechanics in the mid-1920s by Niels Bohr, Erwin Schrödinger, Werner Heisenberg, Max Born, Paul Dirac and others. The modern theory is formulated in various specially developed mathematical formalisms. In one of them, a mathematical entity called the wave function provides information, in the form of probability amplitudes, about what measurements of a particle's energy, momentum, and other physical properties may yield.

Quantum mechanics has had enormous success in explaining many of the features of our universe, with regards to small-scale and discrete quantities and interactions which cannot be explained by classical methods. Quantum mechanics is often the only theory that can reveal the individual behaviors of the subatomic particles that make up all forms of matter (electrons, protons, neutrons, photons, and others). Solid-state physics and materials science are dependent upon quantum mechanics. In many aspects modern technology operates at a scale where quantum effects are significant. Important applications of quantum theory include quantum chemistry, quantum optics, quantum computing, superconducting magnets, light-emitting diodes, the optical amplifier and the laser, the transistor and semiconductors such as the microprocessor, medical and research imaging such as magnetic resonance imaging and electron microscopy. Explanations for many biological and physical phenomena are rooted in the nature of the chemical bond, most notably the macro-molecule DNA.

projected-00025391-001

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

Russia

Etymology

Russia (, ), or the Russian Federation, is a transcontinental country spanning Eastern Europe and Northern Asia. It is the largest country in the world, covering over , and encompassing one-eighth of Earth's inhabitable landmass. Russia extends across eleven time zones sharing land boundaries with fourteen countries, more than any other country but China. It is the ninth-most populous country in the world and the most populous country in Europe, with a population of 146 million. The country's capital and largest city is Moscow, the largest city entirely within Europe. Saint Petersburg is Russia's cultural centre and second-largest city. Other major urban areas include Novosibirsk, Yekaterinburg, Nizhny Novgorod and Kazan. The East Slavs emerged as a recognisable group in Europe between the 3rd and 8th centuries CE. The medieval state of Kievan Rus' arose in the 9th century, and in 988 adopted Orthodox Christianity from the Byzantine Empire. Rus' ultimately disintegrated, with the Grand Duchy of Moscow growing to become the Tsardom of Russia. By the early 18th century, Russia had vastly expanded through conquest, annexation, and exploration to become the Russian Empire, the third-largest empire in history. The monarchy was abolished following the Russian Revolution in 1917, and the Russian SFSR became the world's first constitutionally socialist state. Following a civil war, the Russian SFSR established the Soviet Union with three other republics, as its largest and the principal constituent. The country underwent a period of rapid industrialisation at the expense of millions of lives. The Soviet Union played a decisive role in the Allied victory in World War II, and was a superpower and rival to the United States during the Cold War. The Soviet era saw some of the most significant technological achievements of the 20th century, including the world's first human-made satellite and the launching of the first human into space. Following the dissolution of the Soviet Union in 1991, the newly independent Russian SFSR renamed itself the Russian Federation. In the aftermath of the constitutional crisis of 1993, a new constitution was adopted, and Russia has since been governed as a federal semi-presidential republic. Since his election in 2000, Vladimir Putin has dominated Russia's political system and Russia has experienced democratic backsliding, shifting into an authoritarian state. Russia ranks high in international measurements of standard of living, household income and education; having universal healthcare and a free university education. However, Russia also ranks low in measurements of human rights, freedom of the press, economic freedom, and has high levels of perceived corruption. The Russian economy is the world's ninth-largest by nominal GDP and the sixth-largest by PPP. It has the world's largest stockpile of nuclear weapons, with the fifth-highest military expenditure. Russia's extensive mineral and energy resources are the world's largest, and it is among the leading producers of oil and natural gas globally. It is a permanent member of the United Nations Security Council, a member of the G20, the SCO, BRICS, the APEC, the OSCE and the WTO, as well as the leading member of the CIS, the CSTO, and the EAEU. Russia is home to 30 UNESCO World Heritage Sites.

The name Russia is derived from Rus', a medieval state populated primarily by the East Slavs. However, the proper name became more prominent in later history, and the country typically was called by its inhabitants "Rus land". This state is denoted as Kievan Rus' after its capital city by modern historiography. The name Rus itself comes from the early medieval Rus' people, a group of Norse merchants and warriors who relocated from across the Baltic Sea and founded a state centred on Novgorod that later became Kievan Rus'. A Medieval Latin version of the name Rus' was Ruthenia, which was used as one of several designations for East Slavic and Eastern Orthodox regions, and commonly as a designation for the lands of Rus'. The current name of the country, Россия (Rossiya), comes from the Byzantine Greek designation of the Rus', Ρωσσία Rossíaspelled Ρωσία (Rosía ) in Modern Greek. The standard way to refer to the citizens of Russia is "Russians" in English. There are two words in Russian which are commonly translated into English as "Russians"one is "русские" (russkiye), which most often refers to ethnic Russiansand the other is "россияне" (rossiyane), which refers to citizens of Russia, regardless of ethnicity.

projected-00025784-039

https://en.wikipedia.org/wiki/Renewable%20energy

Renewable energy

Policy

Renewable energy is energy that is collected from renewable resources that are naturally replenished on a human timescale. It includes sources such as sunlight, wind, the movement of water, and geothermal heat. Although most renewable energy sources are sustainable, some are not. For example, some biomass sources are considered unsustainable at current rates of exploitation. Renewable energy often provides energy for electricity generation to a grid, air and water heating/cooling, and stand-alone power systems. From 2011 to 2021, renewable energy has grown from 20% to 28% of global electricity supply. Fossil energy shrunk from 68% to 62%, and nuclear from 12% to 10%. The share of hydropower decreased from 16% to 15% while power from sun and wind increased from 2% to 10%. Biomass and geothermal energy grew from 2% to 3%. There are 3,146 gigawatts installed in 135 countries, while 156 countries have laws regulating the renewable energy sector. Globally there are over 10 million jobs associated with the renewable energy industries, with solar photovoltaics being the largest renewable employer. Renewable energy systems are rapidly becoming more efficient and cheaper and their share of total energy consumption is increasing, with a large majority of worldwide newly installed electricity capacity being renewable. In most countries, photovoltaic solar or onshore wind are the cheapest new-build electricity. Many nations around the world already have renewable energy contributing more than 20% of their total energy supply, with some generating over half their electricity from renewables. A few countries generate all their electricity using renewable energy. National renewable energy markets are projected to continue to grow strongly in the 2020s and beyond. Studies have shown that a global transition to 100% renewable energy across all sectors – power, heat, transport and desalination – is feasible and economically viable. Renewable energy resources exist over wide geographical areas, in contrast to fossil fuels, which are concentrated in a limited number of countries. Deployment of renewable energy and energy efficiency technologies is resulting in significant energy security, climate change mitigation, and economic benefits. However renewables are being hindered by hundreds of billions of dollars of fossil fuel subsidies. In international public opinion surveys there is strong support for renewables such as solar power and wind power. But the International Energy Agency said in 2021 that to reach net zero carbon emissions more effort is needed to increase renewables, and called for generation to increase by about 12% a year to 2030. Renewable energy technology projects are typically large-scale, but they are also suited to rural and remote areas and developing countries, where energy is often crucial in human development. As most of the renewable energy technologies provide electricity, renewable energy is often deployed together with further electrification, which has several benefits: electricity can move heat or objects efficiently, and is clean at the point of consumption. In addition, electrification with renewable energy is more efficient and therefore leads to significant reductions in primary energy requirements. In 2021, China accounted for almost half of the global increase in renewable electricity.

Policies to support renewable energy have been vital in their expansion. Where Europe dominated in establishing energy policy in early 2000s, most countries around the world now have some form of energy policy.

projected-16829895-023

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

Smallpox

Treatment

Smallpox was an infectious disease caused by one of two virus variants, Variola major and Variola minor. The agent of variola virus (VARV) belongs to the genus Orthopoxvirus. The last naturally occurring case was diagnosed in October 1977, and the World Health Organization (WHO) certified the global eradication of the disease in 1980, making it the only human disease to be eradicated. The initial symptoms of the disease included fever and vomiting. This was followed by formation of ulcers in the mouth and a skin rash. Over a number of days, the skin rash turned into the characteristic fluid-filled blisters with a dent in the center. The bumps then scabbed over and fell off, leaving scars. The disease was spread between people or via contaminated objects. Prevention was achieved mainly through the smallpox vaccine. Once the disease had developed, certain antiviral medication may have helped. The risk of death was about 30%, with higher rates among babies. Often, those who survived had extensive scarring of their skin, and some were left blind. The earliest evidence of the disease dates to around 1500 BCE in Egyptian mummies. The disease historically occurred in outbreaks. In 18th-century Europe, it is estimated that 400,000 people died from the disease per year, and that one-third of all cases of blindness were due to smallpox. Smallpox is estimated to have killed up to 300 million people in the 20th century and around 500 million people in the last 100 years of its existence. Earlier deaths included six European monarchs. As recently as 1967, 15 million cases occurred a year. Inoculation for smallpox appears to have started in China around the 1500s. Europe adopted this practice from Asia in the first half of the 18th century. In 1796, Edward Jenner introduced the modern smallpox vaccine. In 1967, the WHO intensified efforts to eliminate the disease. Smallpox is one of two infectious diseases to have been eradicated, the other being rinderpest in 2011. The term "smallpox" was first used in Britain in the early 16th century to distinguish the disease from syphilis, which was then known as the "great pox". Other historical names for the disease include pox, speckled monster, and red plague.

Smallpox vaccination within three days of exposure will prevent or significantly lessen the severity of smallpox symptoms in the vast majority of people. Vaccination four to seven days after exposure can offer some protection from disease or may modify the severity of the disease. Other than vaccination, treatment of smallpox is primarily supportive, such as wound care and infection control, fluid therapy, and possible ventilator assistance. Flat and hemorrhagic types of smallpox are treated with the same therapies used to treat shock, such as fluid resuscitation. People with semi-confluent and confluent types of smallpox may have therapeutic issues similar to patients with extensive skin burns. In July 2018, the Food and Drug Administration approved tecovirimat, the first drug approved for treatment of smallpox. Antiviral treatments have improved since the last large smallpox epidemics, and studies suggest that the antiviral drug cidofovir might be useful as a therapeutic agent. The drug must be administered intravenously, and may cause serious kidney toxicity. ACAM2000 is a smallpox vaccine developed by Acambis. It was approved for use in the United States by the U.S. FDA on August 31, 2007. It contains live vaccinia virus, cloned from the same strain used in an earlier vaccine, Dryvax. While the Dryvax virus was cultured in the skin of calves and freeze-dried, ACAM2000s virus is cultured in kidney epithelial cells (Vero cells) from an African green monkey. Efficacy and adverse reaction incidence are similar to Dryvax. The vaccine is not routinely available to the US public; it is, however, used in the military and maintained in the Strategic National Stockpile. In June 2021, brincidofovir was approved for medical use in the United States for the treatment of human smallpox disease caused by variola virus.

projected-00026199-001

https://en.wikipedia.org/wiki/Roald%20Amundsen

Roald Amundsen

Early life

Roald Engelbregt Gravning Amundsen (, ; ; 16 July 1872 – ) was a Norwegian explorer of polar regions. He was a key figure of the period known as the Heroic Age of Antarctic Exploration. Born in Borge, Østfold, Norway, Amundsen began his career as a polar explorer as first mate on Adrien de Gerlache's Belgian Antarctic Expedition of 1897–1899. From 1903 to 1906, he led the first expedition to successfully traverse the Northwest Passage on the sloop Gjøa. In 1909, Amundsen began planning for a South Pole expedition. He left Norway in June 1910 on the ship Fram and reached Antarctica in January 1911. His party established a camp at the Bay of Whales and a series of supply depots on the Barrier (now known as the Ross Ice Shelf) before setting out for the pole in October. The party of five, led by Amundsen, became the first to successfully reach the South Pole on 14 December 1911. Following a failed attempt in 1918 to reach the North Pole by traversing the Northeast Passage on the ship Maud, Amundsen began planning for an aerial expedition instead. On 12 May 1926, Amundsen and 15 other men in the airship Norge became the first explorers verified to have reached the North Pole. Amundsen disappeared in June 1928 while flying on a rescue mission for the airship in the Arctic. The search for his remains, which have not been found, was called off in September of that year.

Amundsen was born into a family of Norwegian shipowners and captains in Borge, between the towns Fredrikstad and Sarpsborg. His parents were Jens Amundsen and Hanna Sahlqvist. Roald was the fourth son in the family. His mother wanted him to avoid the family maritime trade and encouraged him to become a doctor, a promise that Amundsen kept until his mother died when he was aged 21. He promptly quit university for a life at sea. When he was fifteen years old, Amundsen was enthralled by reading Sir John Franklin's narratives of his overland Arctic expeditions. Amundsen wrote "I read them with a fervid fascination which has shaped the whole course of my life".

projected-00026199-011

https://en.wikipedia.org/wiki/Roald%20Amundsen

Roald Amundsen

Personal life

Roald Engelbregt Gravning Amundsen (, ; ; 16 July 1872 – ) was a Norwegian explorer of polar regions. He was a key figure of the period known as the Heroic Age of Antarctic Exploration. Born in Borge, Østfold, Norway, Amundsen began his career as a polar explorer as first mate on Adrien de Gerlache's Belgian Antarctic Expedition of 1897–1899. From 1903 to 1906, he led the first expedition to successfully traverse the Northwest Passage on the sloop Gjøa. In 1909, Amundsen began planning for a South Pole expedition. He left Norway in June 1910 on the ship Fram and reached Antarctica in January 1911. His party established a camp at the Bay of Whales and a series of supply depots on the Barrier (now known as the Ross Ice Shelf) before setting out for the pole in October. The party of five, led by Amundsen, became the first to successfully reach the South Pole on 14 December 1911. Following a failed attempt in 1918 to reach the North Pole by traversing the Northeast Passage on the ship Maud, Amundsen began planning for an aerial expedition instead. On 12 May 1926, Amundsen and 15 other men in the airship Norge became the first explorers verified to have reached the North Pole. Amundsen disappeared in June 1928 while flying on a rescue mission for the airship in the Arctic. The search for his remains, which have not been found, was called off in September of that year.

Amundsen was a lifelong bachelor, though he had a long-time relationship with the Norwegian-born Kristine Elisabeth ('Kiss') Bennett, the wife of an Englishman, Charles Peto Bennett. He met her in London in 1907 and they remained close for many years, although Amundsen kept the relationship a secret from everyone outside his intimate circle. Later, he became engaged to Bess Magids, an American divorcée whom he had met in Alaska. Though there is little evidence, it was said that Amundsen had a brief affair with his landlady in Antwerp – until he came home and found her dead of an apparent suicide. His biographer Tor Bomann-Larsen also suggests a romantic relationship between Amundsen and Sigrid Castberg, wife of the lawyer Leif Castberg from Gjøvik, in the years before the South Pole expedition, a relationship Amundsen broke up after that expedition in favour of Kiss Bennett. Author Julian Sancton noted that in his younger years, Amundsen was said to have ignored romantic relationships in pursuit of his goals. He "found little use in activities that didn't help him fulfill his polar ambitions".

projected-00026700-001

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

Science

Etymology

Science is a systematic endeavor that builds and organizes knowledge in the form of testable explanations and predictions about the universe. Science may be as old as the human species, and some of the earliest archeological evidence for scientific reasoning is tens of thousands of years old. The earliest written records in the history of science come from Ancient Egypt and Mesopotamia in around 3000 to 1200 BCE. Their contributions to mathematics, astronomy, and medicine entered and shaped Greek natural philosophy of classical antiquity, whereby formal attempts were made to provide explanations of events in the physical world based on natural causes. After the fall of the Western Roman Empire, knowledge of Greek conceptions of the world deteriorated in Western Europe during the early centuries (400 to 1000 CE) of the Middle Ages, but was preserved in the Muslim world during the Islamic Golden Age and later by the efforts of Byzantine Greek scholars who brought Greek manuscripts from the dying Byzantine Empire to Westerm Europe in the Renaissance. The recovery and assimilation of Greek works and Islamic inquiries into Western Europe from the 10th to 13th century revived "natural philosophy", which was later transformed by the Scientific Revolution that began in the 16th century as new ideas and discoveries departed from previous Greek conceptions and traditions. The scientific method soon played a greater role in knowledge creation and it was not until the 19th century that many of the institutional and professional features of science began to take shape; along with the changing of "natural philosophy" to "natural science". Modern science is typically divided into three major branches: natural sciences (e.g., biology, chemistry, and physics), which study the physical world; the social sciences (e.g., economics, psychology, and sociology), which study individuals and societies; and the formal sciences (e.g., logic, mathematics, and theoretical computer science), which study formal systems, governed by axioms and rules. There is disagreement whether the formal sciences are science disciplines, because they do not rely on empirical evidence. Applied sciences are disciplines that use scientific knowledge for practical purposes, such as in engineering and medicine. New knowledge in science is advanced by research from scientists who are motivated by curiosity about the world and a desire to solve problems. Contemporary scientific research is highly collaborative and is usually done by teams in academic and research institutions, government agencies, and companies. The practical impact of their work has led to the emergence of science policies that seek to influence the scientific enterprise by prioritizing the ethical and moral development of commercial products, armaments, health care, public infrastructure, and environmental protection.

The word science has been used in Middle English since the 14th century in the sense of "the state of knowing". The word was borrowed from the Anglo-Norman language as the suffix , which was borrowed from the Latin word , meaning "knowledge, awareness, understanding". It is a noun derivative of the Latin meaning "knowing", and undisputedly derived from the Latin , the present participle , meaning "to know". There are many hypotheses for science's ultimate word origin. According to Michiel de Vaan, Dutch linguist and Indo-Europeanist, may have its origin in the Proto-Italic language as or meaning "to know", which may originate from Proto-Indo-European language as , , meaning "to incise". The Lexikon der indogermanischen Verben proposed is a back-formation of , meaning "to not know, be unfamiliar with", which may derive from Proto-Indo-European in Latin , or , from meaning "to cut". In the past, science was a synonym for "knowledge" or "study", in keeping with its Latin origin. A person who conducted scientific research was called a "natural philosopher" or "man of science". In 1833, William Whewell coined the term scientist and the term first appeared in literature one year later in Mary Somerville's On the Connexion of the Physical Sciences, published in the Quarterly Review.

projected-00026751-002

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

Sun

General characteristics

The Sun is the star at the center of the Solar System. It is a nearly perfect ball of hot plasma, heated to incandescence by nuclear fusion reactions in its core. The Sun radiates this energy mainly as light, ultraviolet, and infrared radiation, and is the most important source of energy for life on Earth. The Sun's radius is about , or 109 times that of Earth. Its mass is about 330,000 times that of Earth, comprising about 99.86% of the total mass of the Solar System. Roughly three-quarters of the Sun's mass consists of hydrogen (~73%); the rest is mostly helium (~25%), with much smaller quantities of heavier elements, including oxygen, carbon, neon, and iron. The Sun is a G-type main-sequence star (G2V). As such, it is informally, and not completely accurately, referred to as a yellow dwarf (its light is actually white). It formed approximately 4.6 billion years ago from the gravitational collapse of matter within a region of a large molecular cloud. Most of this matter gathered in the center, whereas the rest flattened into an orbiting disk that became the Solar System. The central mass became so hot and dense that it eventually initiated nuclear fusion in its core. It is thought that almost all stars form by this process. Every second, the Sun's core fuses about 600 million tons of hydrogen into helium, and in the process converts 4 million tons of matter into energy. This energy, which can take between 10,000 and 170,000 years to escape the core, is the source of the Sun's light and heat. When hydrogen fusion in its core has diminished to the point at which the Sun is no longer in hydrostatic equilibrium, its core will undergo a marked increase in density and temperature while its outer layers expand, eventually transforming the Sun into a red giant. It is calculated that the Sun will become sufficiently large to engulf the current orbits of Mercury and Venus, and render Earth uninhabitable – but not for about five billion years. After this, it will shed its outer layers and become a dense type of cooling star known as a white dwarf, and no longer produce energy by fusion, but still glow and give off heat from its previous fusion. The enormous effect of the Sun on Earth has been recognized since prehistoric times. The Sun was thought of by some cultures as a deity. The synodic rotation of Earth and its orbit around the Sun are the basis of some solar calendars. The predominant calendar in use today is the Gregorian calendar which is based upon the standard 16th-century interpretation of the Sun's observed movement as actual movement.

The Sun is a G-type main-sequence star that constitutes about 99.86% of the mass of the Solar System. The Sun has an absolute magnitude of +4.83, estimated to be brighter than about 85% of the stars in the Milky Way, most of which are red dwarfs. The Sun is a Population I, or heavy-element-rich, star. The formation of the Sun may have been triggered by shockwaves from one or more nearby supernovae. This is suggested by a high abundance of heavy elements in the Solar System, such as gold and uranium, relative to the abundances of these elements in so-called Population II, heavy-element-poor, stars. The heavy elements could most plausibly have been produced by endothermic nuclear reactions during a supernova, or by transmutation through neutron absorption within a massive second-generation star. The Sun is by far the brightest object in the Earth's sky, with an apparent magnitude of −26.74. This is about 13 billion times brighter than the next brightest star, Sirius, which has an apparent magnitude of −1.46. is defined as the mean distance of the Sun's center to Earth's center, though the distance varies as Earth moves from perihelion in January to aphelion in July. The distances can vary between 147,098,074 km (perihelion) and 152,097,701 km (aphelion), and extreme values can range from 147,083,346 km to 152,112,126 km. At its average distance, light travels from the Sun's horizon to Earth's horizon in about 8 minutes and 20 seconds, while light from the closest points of the Sun and Earth takes about two seconds less. The energy of this sunlight supports almost all life on Earth by photosynthesis, and drives Earth's climate and weather. The Sun does not have a definite boundary, but its density decreases exponentially with increasing height above the photosphere. For the purpose of measurement, the Sun's radius is considered to be the distance from its center to the edge of the photosphere, the apparent visible surface of the Sun. By this measure, the Sun is a near-perfect sphere with an oblateness estimated at 9 millionths, which means that its polar diameter differs from its equatorial diameter by only . The tidal effect of the planets is weak and does not significantly affect the shape of the Sun. The Sun rotates faster at its equator than at its poles. This differential rotation is caused by convective motion due to heat transport and the Coriolis force due to the Sun's rotation. In a frame of reference defined by the stars, the rotational period is approximately 25.6 days at the equator and 33.5 days at the poles. Viewed from Earth as it orbits the Sun, the apparent rotational period of the Sun at its equator is about 28 days. Viewed from a vantage point above its north pole, the Sun rotates counterclockwise around its axis of spin.

projected-00026751-003

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

Sun

Composition

The Sun is the star at the center of the Solar System. It is a nearly perfect ball of hot plasma, heated to incandescence by nuclear fusion reactions in its core. The Sun radiates this energy mainly as light, ultraviolet, and infrared radiation, and is the most important source of energy for life on Earth. The Sun's radius is about , or 109 times that of Earth. Its mass is about 330,000 times that of Earth, comprising about 99.86% of the total mass of the Solar System. Roughly three-quarters of the Sun's mass consists of hydrogen (~73%); the rest is mostly helium (~25%), with much smaller quantities of heavier elements, including oxygen, carbon, neon, and iron. The Sun is a G-type main-sequence star (G2V). As such, it is informally, and not completely accurately, referred to as a yellow dwarf (its light is actually white). It formed approximately 4.6 billion years ago from the gravitational collapse of matter within a region of a large molecular cloud. Most of this matter gathered in the center, whereas the rest flattened into an orbiting disk that became the Solar System. The central mass became so hot and dense that it eventually initiated nuclear fusion in its core. It is thought that almost all stars form by this process. Every second, the Sun's core fuses about 600 million tons of hydrogen into helium, and in the process converts 4 million tons of matter into energy. This energy, which can take between 10,000 and 170,000 years to escape the core, is the source of the Sun's light and heat. When hydrogen fusion in its core has diminished to the point at which the Sun is no longer in hydrostatic equilibrium, its core will undergo a marked increase in density and temperature while its outer layers expand, eventually transforming the Sun into a red giant. It is calculated that the Sun will become sufficiently large to engulf the current orbits of Mercury and Venus, and render Earth uninhabitable – but not for about five billion years. After this, it will shed its outer layers and become a dense type of cooling star known as a white dwarf, and no longer produce energy by fusion, but still glow and give off heat from its previous fusion. The enormous effect of the Sun on Earth has been recognized since prehistoric times. The Sun was thought of by some cultures as a deity. The synodic rotation of Earth and its orbit around the Sun are the basis of some solar calendars. The predominant calendar in use today is the Gregorian calendar which is based upon the standard 16th-century interpretation of the Sun's observed movement as actual movement.

The Sun is composed primarily of the chemical elements hydrogen and helium. At this time in the Sun's life, they account for 74.9% and 23.8%, respectively, of the mass of the Sun in the photosphere. All heavier elements, called metals in astronomy, account for less than 2% of the mass, with oxygen (roughly 1% of the Sun's mass), carbon (0.3%), neon (0.2%), and iron (0.2%) being the most abundant. The Sun's original chemical composition was inherited from the interstellar medium out of which it formed. Originally it would have contained about 71.1% hydrogen, 27.4% helium, and 1.5% heavier elements. The hydrogen and most of the helium in the Sun would have been produced by Big Bang nucleosynthesis in the first 20 minutes of the universe, and the heavier elements were produced by previous generations of stars before the Sun was formed, and spread into the interstellar medium during the final stages of stellar life and by events such as supernovae. Since the Sun formed, the main fusion process has involved fusing hydrogen into helium. Over the past 4.6 billion years, the amount of helium and its location within the Sun has gradually changed. Within the core, the proportion of helium has increased from about 24% to about 60% due to fusion, and some of the helium and heavy elements have settled from the photosphere towards the center of the Sun because of gravity. The proportions of heavier elements is unchanged. Heat is transferred outward from the Sun's core by radiation rather than by convection (see Radiative zone below), so the fusion products are not lifted outward by heat; they remain in the core and gradually an inner core of helium has begun to form that cannot be fused because presently the Sun's core is not hot or dense enough to fuse helium. In the current photosphere, the helium fraction is reduced, and the metallicity is only 84% of what it was in the protostellar phase (before nuclear fusion in the core started). In the future, helium will continue to accumulate in the core, and in about 5 billion years this gradual build-up will eventually cause the Sun to exit the main sequence and become a red giant. The chemical composition of the photosphere is normally considered representative of the composition of the primordial Solar System. The solar heavy-element abundances described above are typically measured both using spectroscopy of the Sun's photosphere and by measuring abundances in meteorites that have never been heated to melting temperatures. These meteorites are thought to retain the composition of the protostellar Sun and are thus not affected by the settling of heavy elements. The two methods generally agree well.

wit-train-topic-003977047

projected-00026779-002

https://en.wikipedia.org/wiki/Soviet%20Union

Soviet Union

Geography

The Soviet Union, officially the Union of Soviet Socialist Republics (USSR), was a transcontinental country that spanned much of Eurasia from 1922 to 1991. A flagship communist state, it was nominally a federal union comprising fifteen top-level republics; in practice, both its government and its economy were built on a highly centralized model until its final years. It was a one-party state governed by the Communist Party of the Soviet Union, with Moscow as the capital. Other major cities included Leningrad, Kiev, Minsk, Tashkent, Alma-Ata and Novosibirsk. The Soviet Union was the largest country in the world by land area, covering over and spanning eleven time zones. The Soviet Union traces its origin to the 1917 October Revolution which saw the Bolsheviks led by Vladimir Lenin topple the Provisional Government and establish the RSFSR, the world's first constitutionally socialist state. The October Revolution followed the earlier February Revolution which saw the abdication of Tsar Nicholas II. Bolshevik seizure of power lead to the Russian Civil War, which pitted the Bolsheviks against the White Army. In 1922, the White Army was defeated which spearheaded the creation of the Soviet Union and its Communist Party. Following Lenin's death and state funeral in 1924, Joseph Stalin assumed leadership over the party and country. Beginning a period of Soviet governance guided by Stalinism he inaugurated rapid industrialization and forced collectivization, which led to significant economic growth but also contributed to the Soviet famine of 1930–1933. His rule also saw the expansion of the labour camp system under the Gulag. Between 1936 and 1938, Stalin carried out the Great Purge, a campaign of political repression through which he solidified his power. In 1941, Nazi Germany invaded the Soviet Union, opening up the Eastern Front of World War II. The combined Soviet civilian and military casualty figures—estimated to be around 27 million people—accounted for the majority of losses on the side of the Allies. The total defeat of the Axis in 1945 marked a formal cessation of hostilities, and the territories taken by Soviet forces subsequently formed various Soviet satellite states. By 1947, newfound tensions between the Soviet Union and the United States had escalated into the Cold War. During this period, the Soviet-aligned Eastern Bloc confronted the American-aligned Western Bloc. The two sides consolidated their opposition to each other through ideology-based military alliances: the Warsaw Pact, which formed in 1955 to serve Soviet interests, and the North Atlantic Treaty Organization, which formed earlier in 1949 to serve American interests. Following Stalin's death and state funeral in 1953, a process of ‘de-Stalinization’ was initiated by Nikita Khrushchev. The Soviet Union took an early lead in the Space Race with the first artificial satellite (Sputnik 1), the first human spaceflight (Vostok 1), and the first probe to land on another planet (Venera 7). Throughout the 1970s, there was a détente in Soviet Union–United States relations, but bilateral tensions later worsened due to the Soviet invasion of Afghanistan. In the mid-1980s, the last Soviet leader, Mikhail Gorbachev, sought to reform the country through his policies of glasnost and perestroika. At the end of the Cold War, various socialist states were overthrown by the Revolutions of 1989, jeopardizing the Warsaw Pact. Unrest across the Eastern Bloc was also accompanied by the outbreak of strong nationalist and separatist movements within the Soviet Union itself. To address the question of the country's future, Gorbachev initiated the 1991 Soviet Union referendum—boycotted by the Soviet republics of Lithuania, Latvia, Estonia, Armenia, Georgia, and Moldova—that resulted in the majority of participating citizens voting in favour of the New Union Treaty, which aimed to preserve the Soviet Union as a completely reformed country. Later that year, hardline members of the Communist Party staged the August Coup, which was unsuccessful in overthrowing Gorbachev's government; Boris Yeltsin played a high-profile role in facing down the unrest and the Communist Party was subsequently banned, accelerating the dissolution of the Soviet Union. By December 1991, all of the fifteen Soviet republics had emerged as fully independent post-Soviet states. The Soviet Union made many social and technological achievements and innovations. It was a founding member of the United Nations and one of the permanent members of the United Nations Security Council. It had the world's second-largest economy while the Soviet Armed Forces comprised the world's largest standing military at their peak, also possessing the world's largest nuclear weapons arsenal. Alongside the United States, the Soviet Union was one of the two superpowers from the end of World War II until its dissolution; it exercised global influence through the Eastern Bloc and various forms of aid to the Third World, and scientific research.

The Soviet Union covered an area of over , and was the world's largest country, a status that is retained by its successor state, Russia. It covered a sixth of Earth's land surface, and its size was comparable to the continent of North America. Its western part in Europe accounted for a quarter of the country's area and was the cultural and economic center. The eastern part in Asia extended to the Pacific Ocean to the east and Afghanistan to the south, and, except some areas in Central Asia, was much less populous. It spanned over east to west across eleven time zones, and over north to south. It had five climate zones: tundra, taiga, steppes, desert and mountains. The Soviet Union, similarly to Russia, had the world's longest border, measuring over , or circumferences of Earth. Two-thirds of it was a coastline. The country bordered (from 1945 to 1991): Norway, Finland, the Baltic Sea, Poland, Czechoslovakia, Hungary, Romania, the Black Sea, Turkey, Iran, the Caspian Sea, Afghanistan, China, Mongolia, and North Korea. The Bering Strait separated the country from the United States, while the La Pérouse Strait separated it from Japan. The Soviet Union's highest mountain was Communism Peak (now Ismoil Somoni Peak) in Tajik SSR, at . It also included most of the world's largest lakes; the Caspian Sea (shared with Iran), and Lake Baikal in Russia, the world's largest and deepest freshwater lake.

projected-00026808-003

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

Star

Designations

A star is an astronomical object comprising a luminous spheroid of plasma held together by its gravity. The nearest star to Earth is the Sun. Many other stars are visible to the naked eye at night, but their immense distances from Earth make them appear as fixed points of light. The most prominent stars have been categorised into constellations and asterisms, and many of the brightest stars have proper names. Astronomers have assembled star catalogues that identify the known stars and provide standardized stellar designations. The observable universe contains an estimated to stars. Only about 4,000 of these stars are visible to the naked eye, all within the Milky Way galaxy. A star's life begins with the gravitational collapse of a gaseous nebula of material composed primarily of hydrogen, along with helium and trace amounts of heavier elements. Its total mass is the main factor determining its evolution and eventual fate. A star shines for most of its active life due to the thermonuclear fusion of hydrogen into helium in its core. This process releases energy that traverses the star's interior and radiates into outer space. At the end of a star's lifetime, its core becomes a stellar remnant: a white dwarf, a neutron star, or—if it is sufficiently massive—a black hole. Stellar nucleosynthesis in stars or their remnants creates almost all naturally occurring chemical elements heavier than lithium. Stellar mass loss or supernova explosions return chemically enriched material to the interstellar medium. These elements are then recycled into new stars. Astronomers can determine stellar properties—including mass, age, metallicity (chemical composition), variability, distance, and motion through space—by carrying out observations of a star's apparent brightness, spectrum, and changes in its position in the sky over time. Stars can form orbital systems with other astronomical objects, as in the case of planetary systems and star systems with two or more stars. When two such stars have a relatively close orbit, their gravitational interaction can significantly impact their evolution. Stars can form part of a much larger gravitationally bound structure, such as a star cluster or a galaxy.

The concept of a constellation was known to exist during the Babylonian period. Ancient sky watchers imagined that prominent arrangements of stars formed patterns, and they associated these with particular aspects of nature or their myths. Twelve of these formations lay along the band of the ecliptic and these became the basis of astrology. Many of the more prominent individual stars were given names, particularly with Arabic or Latin designations. As well as certain constellations and the Sun itself, individual stars have their own myths. To the Ancient Greeks, some "stars", known as planets (Greek πλανήτης (planētēs), meaning "wanderer"), represented various important deities, from which the names of the planets Mercury, Venus, Mars, Jupiter and Saturn were taken. (Uranus and Neptune were Greek and Roman gods, but neither planet was known in Antiquity because of their low brightness. Their names were assigned by later astronomers.) Circa 1600, the names of the constellations were used to name the stars in the corresponding regions of the sky. The German astronomer Johann Bayer created a series of star maps and applied Greek letters as designations to the stars in each constellation. Later a numbering system based on the star's right ascension was invented and added to John Flamsteed's star catalogue in his book "Historia coelestis Britannica" (the 1712 edition), whereby this numbering system came to be called Flamsteed designation or Flamsteed numbering. The internationally recognized authority for naming celestial bodies is the International Astronomical Union (IAU). The International Astronomical Union maintains the Working Group on Star Names (WGSN) which catalogs and standardizes proper names for stars. A number of private companies sell names of stars which are not recognized by the IAU, professional astronomers, or the amateur astronomy community. The British Library calls this an unregulated commercial enterprise, and the New York City Department of Consumer and Worker Protection issued a violation against one such star-naming company for engaging in a deceptive trade practice.

projected-00026808-022

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

Star

Radiation

A star is an astronomical object comprising a luminous spheroid of plasma held together by its gravity. The nearest star to Earth is the Sun. Many other stars are visible to the naked eye at night, but their immense distances from Earth make them appear as fixed points of light. The most prominent stars have been categorised into constellations and asterisms, and many of the brightest stars have proper names. Astronomers have assembled star catalogues that identify the known stars and provide standardized stellar designations. The observable universe contains an estimated to stars. Only about 4,000 of these stars are visible to the naked eye, all within the Milky Way galaxy. A star's life begins with the gravitational collapse of a gaseous nebula of material composed primarily of hydrogen, along with helium and trace amounts of heavier elements. Its total mass is the main factor determining its evolution and eventual fate. A star shines for most of its active life due to the thermonuclear fusion of hydrogen into helium in its core. This process releases energy that traverses the star's interior and radiates into outer space. At the end of a star's lifetime, its core becomes a stellar remnant: a white dwarf, a neutron star, or—if it is sufficiently massive—a black hole. Stellar nucleosynthesis in stars or their remnants creates almost all naturally occurring chemical elements heavier than lithium. Stellar mass loss or supernova explosions return chemically enriched material to the interstellar medium. These elements are then recycled into new stars. Astronomers can determine stellar properties—including mass, age, metallicity (chemical composition), variability, distance, and motion through space—by carrying out observations of a star's apparent brightness, spectrum, and changes in its position in the sky over time. Stars can form orbital systems with other astronomical objects, as in the case of planetary systems and star systems with two or more stars. When two such stars have a relatively close orbit, their gravitational interaction can significantly impact their evolution. Stars can form part of a much larger gravitationally bound structure, such as a star cluster or a galaxy.

The energy produced by stars, a product of nuclear fusion, radiates to space as both electromagnetic radiation and particle radiation. The particle radiation emitted by a star is manifested as the stellar wind, which streams from the outer layers as electrically charged protons and alpha and beta particles. A steady stream of almost massless neutrinos emanate directly from the star's core. The production of energy at the core is the reason stars shine so brightly: every time two or more atomic nuclei fuse together to form a single atomic nucleus of a new heavier element, gamma ray photons are released from the nuclear fusion product. This energy is converted to other forms of electromagnetic energy of lower frequency, such as visible light, by the time it reaches the star's outer layers. The color of a star, as determined by the most intense frequency of the visible light, depends on the temperature of the star's outer layers, including its photosphere. Besides visible light, stars emit forms of electromagnetic radiation that are invisible to the human eye. In fact, stellar electromagnetic radiation spans the entire electromagnetic spectrum, from the longest wavelengths of radio waves through infrared, visible light, ultraviolet, to the shortest of X-rays, and gamma rays. From the standpoint of total energy emitted by a star, not all components of stellar electromagnetic radiation are significant, but all frequencies provide insight into the star's physics. Using the stellar spectrum, astronomers can determine the surface temperature, surface gravity, metallicity and rotational velocity of a star. If the distance of the star is found, such as by measuring the parallax, then the luminosity of the star can be derived. The mass, radius, surface gravity, and rotation period can then be estimated based on stellar models. (Mass can be calculated for stars in binary systems by measuring their orbital velocities and distances. Gravitational microlensing has been used to measure the mass of a single star.) With these parameters, astronomers can estimate the age of the star.

projected-00026847-001

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

Socialism

Etymology

Socialism is a left-wing economic philosophy and movement encompassing a range of economic systems characterized by the dominance of social ownership of the means of production as opposed to private ownership. As a term, it describes the economic, political and social theories and movements associated with the implementation of such systems. Social ownership can be state/public, community, collective, cooperative, or employee. While no single definition encapsulates the many types of socialism, social ownership is the one common element. Different types of socialism vary based on the role of markets and planning in resource allocation, on the structure of management in organizations, and from below or from above approaches, with some socialists favouring a party, state, or technocratic-driven approach. Socialists disagree on whether government, particularly existing government, is the correct vehicle for change. Socialist systems are divided into non-market and market forms. Non-market socialism substitutes factor markets and often money with integrated economic planning and engineering or technical criteria based on calculation performed in-kind, thereby producing a different economic mechanism that functions according to different economic laws and dynamics than those of capitalism. A non-market socialist system seeks to eliminate the perceived inefficiencies, irrationalities, unpredictability, and crises that socialists traditionally associate with capital accumulation and the profit system in capitalism. By contrast, market socialism retains the use of monetary prices, factor markets and in some cases the profit motive, with respect to the operation of socially owned enterprises and the allocation of capital goods between them. Profits generated by these firms would be controlled directly by the workforce of each firm or accrue to society at large in the form of a social dividend. Anarchism and libertarian socialism oppose the use of the state as a means to establish socialism, favouring decentralisation above all, whether to establish non-market socialism or market socialism. Socialist politics has been both internationalist and nationalist; organised through political parties and opposed to party politics; at times overlapping with trade unions and at other times independent and critical of them, and present in both industrialised and developing nations. Social democracy originated within the socialist movement, supporting economic and social interventions to promote social justice. While retaining socialism as a long-term goal, since the post-war period it has come to embrace a Keynesian mixed economy within a predominantly developed capitalist market economy and liberal democratic polity that expands state intervention to include income redistribution, regulation, and a welfare state. Economic democracy proposes a sort of market socialism, with more democratic control of companies, currencies, investments and natural resources. The socialist political movement includes a set of political philosophies that originated in the revolutionary movements of the mid-to-late 18th century and out of concern for the social problems that were associated with capitalism. By the late 19th century, after the work of Karl Marx and his collaborator Friedrich Engels, socialism had come to signify opposition to capitalism and advocacy for a post-capitalist system based on some form of social ownership of the means of production. By the early 1920s, communism and social democracy had become the two dominant political tendencies within the international socialist movement, with socialism itself becoming the most influential secular movement of the 20th century. Socialist parties and ideas remain a political force with varying degrees of power and influence on all continents, heading national governments in many countries around the world. Today, many socialists have also adopted the causes of other social movements such as feminism, environmentalism, and progressivism. While the emergence of the Soviet Union as the world's first nominally socialist state led to socialism's widespread association with the Soviet economic model, several scholars posit that in practice, the model functioned as a form of state capitalism. Several academics, political commentators, and scholars have distinguished between authoritarian socialist and democratic socialist states, with the first representing the Eastern Bloc and the latter representing Western Bloc countries which have been democratically governed by socialist parties such as Britain, France, Sweden, and Western countries in general, among others. However, following the end of the Cold War, many of these countries have moved away from socialism as a neoliberal consensus replaced the social democratic consensus in the advanced capitalist world.

For Andrew Vincent, "[t]he word 'socialism' finds its root in the Latin , which means to combine or to share. The related, more technical term in Roman and then medieval law was . This latter word could mean companionship and fellowship as well as the more legalistic idea of a consensual contract between freemen". Initial use of socialism was claimed by Pierre Leroux, who alleged he first used the term in the Parisian journal in 1832. Leroux was a follower of Henri de Saint-Simon, one of the founders of what would later be labelled utopian socialism. Socialism contrasted with the liberal doctrine of individualism that emphasized the moral worth of the individual whilst stressing that people act or should act as if they are in isolation from one another. The original utopian socialists condemned this doctrine of individualism for failing to address social concerns during the Industrial Revolution, including poverty, oppression, and vast wealth inequality. They viewed their society as harming community life by basing society on competition. They presented socialism as an alternative to liberal individualism based on the shared ownership of resources. Saint-Simon proposed economic planning, scientific administration and the application of scientific understanding to the organisation of society. By contrast, Robert Owen proposed to organise production and ownership via cooperatives. Socialism is also attributed in France to Marie Roch Louis Reybaud while in Britain it is attributed to Owen, who became one of the fathers of the cooperative movement. The definition and usage of socialism settled by the 1860s, replacing associationist, co-operative, and mutualist that had been used as synonyms while communism fell out of use during this period. An early distinction between communism and socialism was that the latter aimed to only socialise production while the former aimed to socialise both production and consumption (in the form of free access to final goods). By 1888, Marxists employed socialism in place of communism as the latter had come to be considered an old-fashioned synonym for socialism. It was not until after the Bolshevik Revolution that socialism was appropriated by Vladimir Lenin to mean a stage between capitalism and communism. He used it to defend the Bolshevik program from Marxist criticism that Russia's productive forces were not sufficiently developed for communism. The distinction between communism and socialism became salient in 1918 after the Russian Social Democratic Labour Party renamed itself to the All-Russian Communist Party, interpreting communism specifically to mean socialists who supported the politics and theories of Bolshevism, Leninism and later that of Marxism–Leninism, although communist parties continued to describe themselves as socialists dedicated to socialism. According to The Oxford Handbook of Karl Marx, "Marx used many terms to refer to a post-capitalist society—positive humanism, socialism, Communism, realm of free individuality, free association of producers, etc. He used these terms completely interchangeably. The notion that 'socialism' and 'Communism' are distinct historical stages is alien to his work and only entered the lexicon of Marxism after his death". In Christian Europe, communists were believed to have adopted atheism. In Protestant England, communism was too close to the Roman Catholic communion rite, hence socialist was the preferred term. Engels wrote that in 1848, when The Communist Manifesto was published, socialism was respectable in Europe while communism was not. The Owenites in England and the Fourierists in France were considered respectable socialists while working-class movements that "proclaimed the necessity of total social change" denoted themselves communists. This branch of socialism produced the communist work of Étienne Cabet in France and Wilhelm Weitling in Germany. British moral philosopher John Stuart Mill discussed a form of economic socialism within a liberal context that would later be known as liberal socialism. In later editions of his Principles of Political Economy (1848), Mill posited that "as far as economic theory was concerned, there is nothing in principle in economic theory that precludes an economic order based on socialist policies" and promoted substituting capitalist businesses with worker cooperatives. While democrats looked to the Revolutions of 1848 as a democratic revolution which in the long run ensured liberty, equality, and fraternity, Marxists denounced it as a betrayal of working-class ideals by a bourgeoisie indifferent to the proletariat.

projected-00027019-015

https://en.wikipedia.org/wiki/South%20Korea

South Korea

Administrative divisions

South Korea, officially the Republic of Korea (ROK), is a country in East Asia, constituting the southern part of the Korean Peninsula and sharing a land border with North Korea. Its western border is formed by the Yellow Sea, while its eastern border is defined by the Sea of Japan. South Korea claims to be the sole legitimate government of the entire peninsula and adjacent islands. It has a population of 51.75 million, of which roughly half live in the Seoul Capital Area, the fourth most populous metropolitan area in the world. Other major cities include Incheon, Busan, and Daegu. The Korean Peninsula was inhabited as early as the Lower Paleolithic period. Its first kingdom was noted in Chinese records in the early 7th century BCE. Following the unification of the Three Kingdoms of Korea into Silla and Balhae in the late 7th century, Korea was ruled by the Goryeo dynasty (918–1392) and the Joseon dynasty (1392–1897). The succeeding Korean Empire (1897–1910) was annexed in 1910 into the Empire of Japan. Japanese rule ended following the former's surrender in World War II, after which Korea was divided into two zones; a northern zone occupied by the Soviet Union and a southern zone occupied by the United States. After negotiations on reunification failed, the latter became the Republic of Korea in August 1948 while the former became the socialist Democratic People's Republic of Korea the following month. In 1950, a North Korean invasion began the Korean War, which saw extensive American-led United Nations intervention in support of the South, while China intervened to support the North, with Soviet assistance. After the war's end in 1953, the country entered into a military alliance with the U.S., and its devastated economy began to soar, recording the fastest rise in average GDP per capita in the world between 1980 and 1990. Despite lacking natural resources, the nation rapidly developed to become one of the Four Asian Tigers based on international trade and economic globalization, integrating itself within the world economy with export-oriented industrialization; currently being one of the largest exporting nations in the world, along with having one of the largest foreign-exchange reserves in the world. The June Democratic Struggle led to the end of authoritarian rule in 1987 and the country is now considered among the most advanced democracies in Asia, with the highest level of press freedom on the continent. South Korea is a highly developed country and is ranked as the fifth-highest country on the Human Development Index (HDI) in the Asia and Oceania region. South Korea has the third-highest life expectancy in the world. In recent years, the country has been facing an aging population and the lowest fertility rate in the world. Its economy ranks as the world's twelfth-largest by nominal GDP. Its citizens enjoy one of the world's fastest Internet connection speeds and the densest high-speed railway network. The country is the world's ninth-largest exporter and ninth-largest importer. Its armed forces are ranked as one of the world's strongest militaries, with the world's second-largest standing army by military and paramilitary personnel. Since the 21st century, South Korea has been renowned for its globally influential pop culture, particularly in music (K-pop), TV dramas (K-dramas) and cinema, a phenomenon referred to as the Korean wave. It is a member of the OECD's Development Assistance Committee, the G20, the IPEF, and the Paris Club.

The major administrative divisions in South Korea are eight provinces, one special self-governing province, six metropolitan cities (self-governing cities that are not part of any province), one special city and one special self-governing city.

projected-33734529-002

https://en.wikipedia.org/wiki/Visual%20arts

Visual arts

Drawing

The visual arts are art forms such as painting, drawing, printmaking, sculpture, ceramics, photography, video, filmmaking, design, crafts and architecture. Many artistic disciplines such as performing arts, conceptual art, and textile arts also involve aspects of visual arts as well as arts of other types. Also included within the visual arts are the applied arts such as industrial design, graphic design, fashion design, interior design and decorative art. Current usage of the term "visual arts" includes fine art as well as the applied or decorative arts and crafts, but this was not always the case. Before the Arts and Crafts Movement in Britain and elsewhere at the turn of the 20th century, the term 'artist' had for some centuries often been restricted to a person working in the fine arts (such as painting, sculpture, or printmaking) and not the decorative arts, craft, or applied Visual arts media. The distinction was emphasized by artists of the Arts and Crafts Movement, who valued vernacular art forms as much as high forms. Art schools made a distinction between the fine arts and the crafts, maintaining that a craftsperson could not be considered a practitioner of the arts. The increasing tendency to prefer the painting styles, and to a lesser degree sculpture, of technique or style over another has been a feature of artist throughout the ages. In many instances painting has been seen as relying to the highest degree on the imagination of the artist, and the furthest removed from manual labour – in Chinese painting the most highly valued styles were those of "scholar-painting", at least in theory practiced by gentleman amateurs. The Western hierarchy of genres reflected similar attitudes.

Drawing is a means of making an image, illustration or graphic using any of a wide variety of tools and techniques available online and offline. It generally involves making marks on a surface by applying pressure from a tool, or moving a tool across a surface using dry media such as graphite pencils, pen and ink, inked brushes, wax color pencils, crayons, charcoals, pastels, and markers. Digital tools, including pens, stylus, that simulate the effects of these are also used. The main techniques used in drawing are: line drawing, hatching, crosshatching, random hatching, shading, scribbling, stippling, and blending. An artist who excels in drawing is referred to as a draftsman or draughtsman. Drawing and painting goes back tens of thousands of years. Art of the Upper Paleolithic includes figurative art beginning between about 40,000 to 35,000 years ago. Non-figurative cave paintings consisting of hand stencils and simple geometric shapes are even older. Paleolithic cave representations of animals are found in areas such as Lascaux, France and Altamira, Spain in Europe, Maros, Sulawesi in Asia, and Gabarnmung, Australia. In ancient Egypt, ink drawings on papyrus, often depicting people, were used as models for painting or sculpture. Drawings on Greek vases, initially geometric, later developed to the human form with black-figure pottery during the 7th century BC. With paper becoming common in Europe by the 15th century, drawing was adopted by masters such as Sandro Botticelli, Raphael, Michelangelo, and Leonardo da Vinci who sometimes treated drawing as an art in its own right rather than a preparatory stage for painting or sculpture.

projected-33734529-016

https://en.wikipedia.org/wiki/Visual%20arts

Visual arts

Photography

The visual arts are art forms such as painting, drawing, printmaking, sculpture, ceramics, photography, video, filmmaking, design, crafts and architecture. Many artistic disciplines such as performing arts, conceptual art, and textile arts also involve aspects of visual arts as well as arts of other types. Also included within the visual arts are the applied arts such as industrial design, graphic design, fashion design, interior design and decorative art. Current usage of the term "visual arts" includes fine art as well as the applied or decorative arts and crafts, but this was not always the case. Before the Arts and Crafts Movement in Britain and elsewhere at the turn of the 20th century, the term 'artist' had for some centuries often been restricted to a person working in the fine arts (such as painting, sculpture, or printmaking) and not the decorative arts, craft, or applied Visual arts media. The distinction was emphasized by artists of the Arts and Crafts Movement, who valued vernacular art forms as much as high forms. Art schools made a distinction between the fine arts and the crafts, maintaining that a craftsperson could not be considered a practitioner of the arts. The increasing tendency to prefer the painting styles, and to a lesser degree sculpture, of technique or style over another has been a feature of artist throughout the ages. In many instances painting has been seen as relying to the highest degree on the imagination of the artist, and the furthest removed from manual labour – in Chinese painting the most highly valued styles were those of "scholar-painting", at least in theory practiced by gentleman amateurs. The Western hierarchy of genres reflected similar attitudes.

Photography is the process of making pictures by means of the action of light. The light patterns reflected or emitted from objects are recorded onto a sensitive medium or storage chip through a timed exposure. The process is done through mechanical shutters or electronically timed exposure of photons into chemical processing or digitizing devices known as cameras. The word comes from the Greek φως phos ("light"), and γραφις graphis ("stylus", "paintbrush") or γραφη graphê, together meaning "drawing with light" or "representation by means of lines" or "drawing." Traditionally, the product of photography has been called a photograph. The term photo is an abbreviation; many people also call them pictures. In digital photography, the term image has begun to replace photograph. (The term image is traditional in geometric optics.)

projected-00027318-001

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

Singapore

Name and etymology

Singapore (), officially the Republic of Singapore, is a sovereign island country and city-state in maritime Southeast Asia. It lies about one degree of latitude () north of the equator, off the southern tip of the Malay Peninsula, bordering the Strait of Malacca to the west, the Singapore Strait to the south, the South China Sea to the east, and the Straits of Johor to the north. The country's territory is composed of one main island, 63 satellite islands and islets, and one outlying islet, the combined area of which has increased by 25% since the country's independence as a result of extensive land reclamation projects. It has the third highest population density in the world. With a multicultural population and recognising the need to respect cultural identities of the major ethnic groups within the nation, Singapore has four official languages: English, Malay, Mandarin, and Tamil. English is the lingua franca and numerous public services are available only in English. Multiracialism is enshrined in the constitution and continues to shape national policies in education, housing, and politics. Singapore's history dates back at least a millennium, having been a maritime emporium known as Temasek and subsequently as a major constituent part of several successive thalassocratic empires. Its contemporary era began in 1819 when Stamford Raffles established Singapore as an entrepôt trading post of the British Empire. In 1867, the colonies in Southeast Asia were reorganised and Singapore came under the direct control of Britain as part of the Straits Settlements. During the Second World War, Singapore was occupied by Japan in 1942, and returned to British control as a separate crown colony following Japan's surrender in 1945. Singapore gained self-governance in 1959 and in 1963 became part of the new federation of Malaysia, alongside Malaya, North Borneo, and Sarawak. Ideological differences, most notably the perceived encroachment of the egalitarian "Malaysian Malaysia" political ideology led by Lee Kuan Yew into the other constituent entities of Malaysia—at the perceived expense of the bumiputera and the policies of Ketuanan Melayu—eventually led to Singapore's expulsion from the federation two years later; Singapore became an independent sovereign country in 1965. After early years of turbulence whilst lacking natural resources and a hinterland, the nation rapidly developed to become one of the Four Asian Tigers based on international trade and economic globalisation, integrating itself within the world economy through free trade with minimal to no trade barriers or tariffs, export-oriented industrialisation, and the large accumulation of received foreign direct investments, foreign-exchange reserves, and assets held by sovereign wealth funds. A highly developed country, it is tied for 11th on the UN Human Development Index and has the second-highest GDP per capita (PPP) in the world. Identified as a tax haven, Singapore is the only country in Asia with a AAA sovereign credit rating from all major rating agencies. It is a major aviation, financial, and maritime shipping hub, and has consistently been ranked as one of the most expensive cities to live in for expatriates and foreign workers. Singapore is placed highly in key social indicators: education, healthcare, quality of life, personal safety, infrastructure, and housing, with a home-ownership rate of 88 percent. Singaporeans enjoy one of the longest life expectancies, fastest Internet connection speeds, lowest infant mortality rates, and lowest levels of corruption in the world. Singapore is a unitary parliamentary republic with a Westminster system of unicameral parliamentary government, and its legal system is based on common law. Although the country is a multi-party democracy with free elections, the government under the People's Action Party (PAP) wields significant control and dominance over politics and society. The PAP has ruled the country continuously since full internal self-government was achieved in 1959, with 83 out of 104 seats in Parliament as of the 2020 election, the rest of the seats being held by the Workers' Party (WP) and the Progress Singapore Party (PSP). One of the five founding members of ASEAN, Singapore is also the headquarters of the Asia-Pacific Economic Cooperation (APEC) Secretariat, the Pacific Economic Cooperation Council (PECC) Secretariat, and is the host city of many international conferences and events. Singapore is also a member of the United Nations, World Trade Organization, East Asia Summit, Non-Aligned Movement, and the Commonwealth of Nations.

The English name of "Singapore" is an anglicisation of the native Malay name for the country, Singapura, which was in turn derived from the Sanskrit word for "lion city" (Sanskrit: सिंहपुर; romanised: Siṃhapura; Brahmi: 𑀲𑀺𑀁𑀳𑀧𑀼𑀭; literally "lion city"; siṃha means "lion", pura means "city" or "fortress"). A Chinese account from the third century referred to a place as Pú Luó Zhōng (), which sounds like Malay for "island at the end of a peninsula." Early references to the name Temasek (or Tumasik) are found in the Nagarakretagama, a Javanese eulogy written in 1365, and a Vietnamese source from the same time period. The name possibly means "Sea Town", being derived from the Malay tasek, meaning "sea" or "lake". The Chinese traveller Wang Dayuan visited a place around 1330 named Danmaxi () or Tam ma siak, depending on pronunciation. Danmaxi may be a transcription of Temasek, alternatively, it may be a combination of the Malay Tanah meaning "land" and Chinese Xi meaning "tin," which was traded on the island. Variations of the name Siṃhapura were used for a number of cities throughout the region prior to the establishment of the Kingdom of Singapura. In Hindu-Buddhist culture, lions were associated with power and protection, which may explain the attraction of such a name. The name Singapura supplanted Temasek sometime before the 15th century, after the establishment of the Kingdom of Singapura on the island by a fleeing Sumatran Raja (prince) from Palembang. However, the precise time and reason for the name change is unknown. The semi-historical Malay Annals state that Temasek was christened Singapura by Sang Nila Utama, a 13th-century Sumatran Raja from Palembang. The Annals state that Sang Nila Utama encountered a strange beast on the island that he took to be a lion. Seeing this as an omen, he established the town of Singapura where he encountered the beast. The second hypothesis, drawn from Portuguese sources, postulates that this mythical story is based on the real life Parameswara of Palembang. Parameswara declared independence from Majapahit and mounted a Lion Throne. After then being driven into exile by the Javanese, he usurped control over Temasek. It is possible that he rechristened the area as Singapura, recalling the throne he had been driven from. Under Japanese occupation, Singapore was renamed , meaning "Light of the South." Singapore is sometimes referred to by the nickname the "Garden City," in reference to its parks and tree-lined streets. Another informal name, the "Little Red Dot," was adopted after an article in the Asian Wall Street Journal of 4 August 1998 said that Indonesian President B. J. Habibie referred to Singapore as a red dot on a map.

projected-00027712-001

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

Sugar

Etymology

Sugar is the generic name for sweet-tasting, soluble carbohydrates, many of which are used in food. Simple sugars, also called monosaccharides, include glucose, fructose, and galactose. Compound sugars, also called disaccharides or double sugars, are molecules made of two bonded monosaccharides; common examples are sucrose (glucose + fructose), lactose (glucose + galactose), and maltose (two molecules of glucose). White sugar is a refined form of sucrose. In the body, compound sugars are hydrolysed into simple sugars. Longer chains of monosaccharides (>2) are not regarded as sugars, and are called oligosaccharides or polysaccharides. Starch is a glucose polymer found in plants, and is the most abundant source of energy in human food. Some other chemical substances, such as glycerol and sugar alcohols, may have a sweet taste, but are not classified as sugar. Sugars are found in the tissues of most plants. Honey and fruit are abundant natural sources of simple sugars. Sucrose is especially concentrated in sugarcane and sugar beet, making them ideal for efficient commercial extraction to make refined sugar. In 2016, the combined world production of those two crops was about two billion tonnes. Maltose may be produced by malting grain. Lactose is the only sugar that cannot be extracted from plants. It can only be found in milk, including human breast milk, and in some dairy products. A cheap source of sugar is corn syrup, industrially produced by converting corn starch into sugars, such as maltose, fructose and glucose. Sucrose is used in prepared foods (e.g. cookies and cakes), is sometimes added to commercially available processed food and beverages, and may be used by people as a sweetener for foods (e.g. toast and cereal) and beverages (e.g. coffee and tea). The average person consumes about of sugar each year, with North and South Americans consuming up to and Africans consuming under . As sugar consumption grew in the latter part of the 20th century, researchers began to examine whether a diet high in sugar, especially refined sugar, was damaging to human health. Excessive consumption of sugar has been implicated in the onset of obesity, diabetes, cardiovascular disease, and tooth decay. Numerous studies have tried to clarify those implications, but with varying results, mainly because of the difficulty of finding populations for use as controls that consume little or no sugar. In 2015, the World Health Organization recommended that adults and children reduce their intake of free sugars to less than 10%, and encouraged a reduction to below 5%, of their total energy intake.

The etymology reflects the spread of the commodity. From Sanskrit (śarkarā), meaning "ground or candied sugar", came Persian shakar, then to 12th century French sucre and the English sugar. The English word jaggery, a coarse brown sugar made from date palm sap or sugarcane juice, has a similar etymological origin: Portuguese jágara from the Malayalam cakkarā, which is from the Sanskrit śarkarā.

projected-00028151-002

https://en.wikipedia.org/wiki/State%20%28polity%29

State (polity)

Definition

A state is a centralized political organization that imposes and enforces rules over a population within a territory. There is no undisputed definition of a state. One widely used definition comes from the German sociologist Max Weber: a "state" is a polity that maintains a monopoly on the legitimate use of violence, although other definitions are not uncommon. A state does not preclude the existence of a society, such as stateless societies like the Haudenosaunee Confederacy that "do not have either purely or even primarily political institutions or roles". The level of governance of a state, government being considered to form the fundamental apparatus of contemporary states, is used to determine whether it has failed. In a federal union, the term "state" is sometimes used to refer to the federated polities that make up the federation. (Other terms that are used in such federal systems may include “province”, “region” or other terms.) Most of the human population has existed within a state system for millennia; however, for most of prehistory people lived in stateless societies. The earliest forms of states arose about 5,500 years ago as governments gained state capacity in conjunction with rapid growth of cities, invention of writing and codification of new forms of religion. Over time, a variety of forms of states developed, which used many different justifications for their existence (such as divine right, the theory of the social contract, etc.). Today, the modern nation state is the predominant form of state to which people are subject.

There is no academic consensus on the definition of the state. The term "state" refers to a set of different, but interrelated and often overlapping, theories about a certain range of political phenomena. According to Walter Scheidel, mainstream definitions of the state have the following in common: "centralized institutions that impose rules, and back them up by force, over a territorially circumscribed population; a distinction between the rulers and the ruled; and an element of autonomy, stability, and differentiation. These distinguish the state from less stable forms of organization, such as the exercise of chiefly power." The most commonly used definition is by Max Weber who describes the state as a compulsory political organization with a centralized government that maintains a monopoly of the legitimate use of force within a certain territory. Weber writes that the state "is a human community that (successfully) claims the monopoly of the legitimate use of physical force within a given territory." Charles Tilly defines states as "coercion-wielding organisations that are distinct from households and kinship groups and exercise clear priority in some respects over all other organizations within substantial territories." Tilly includes city-states, theocracies and empires in his definition along with nation-states, but excludes tribes, lineages, firms and churches. According to Tilly, states began appearing around 990, but became particularly prominent after 1490. Tilly defines a state's "essential minimal activities" as: War making – "eliminating or neutralizing their own rivals" State making – "eliminating or neutralizing their rivals inside their own territory" Protection – "eliminating or neutralizing the enemies of their clients" Extraction – "acquiring the means of carrying out the first three activities" Adjudication – "authoritative settlement of disputes among members of the population" Distribution – "intervention in the allocation of goods among the members of the population" Production – "control of the creation and transformation of goods and services produced by the population" Modern academic definitions of the state frequently include the criteria that a state has to be recognized as such by the international community. Liberal thought provides another possible teleology of the state. According to John Locke, the goal of the state or commonwealth is "the preservation of property" (Second Treatise on Government), with 'property' in Locke's work referring not only to personal possessions but also to one's life and liberty. On this account, the state provides the basis for social cohesion and productivity, creating incentives for wealth-creation by providing guarantees of protection for one's life, liberty and personal property. Provision of public goods is considered by some such as Adam Smith as a central function of the state, since these goods would otherwise be underprovided. Tilly has challenged narratives of the state as being the result of a societal contract or provision of services in a free market – he characterizes the state more akin as a protection racket in the vein of organized crime. While economic and political philosophers have contested the monopolistic tendency of states, Robert Nozick argues that the use of force naturally tends towards monopoly. Another commonly accepted definition of the state is the one given at the Montevideo Convention on Rights and Duties of States in 1933. It provides that "[t]he state as a person of international law should possess the following qualifications: (a) a permanent population; (b) a defined territory; (c) government; and (d) capacity to enter into relations with the other states." And that "[t]he federal state shall constitute a sole person in the eyes of international law." Confounding the definition problem is that "state" and "government" are often used as synonyms in common conversation and even some academic discourse. According to this definition schema, the states are nonphysical persons of international law, governments are organizations of people. The relationship between a government and its state is one of representation and authorized agency.

wit-train-topic-002373109

projected-00029252-007

https://en.wikipedia.org/wiki/Sexual%20orientation

Sexual orientation

Causes

Sexual orientation is an enduring pattern of romantic or sexual attraction (or a combination of these) to persons of the opposite sex or gender, the same sex or gender, or to both sexes or more than one gender. These attractions are generally subsumed under heterosexuality, homosexuality, and bisexuality, while asexuality (the lack of sexual attraction to others) is sometimes identified as the fourth category. These categories are aspects of the more nuanced nature of sexual identity and terminology. For example, people may use other labels, such as pansexual or polysexual, or none at all. According to the American Psychological Association, sexual orientation "also refers to a person's sense of identity based on those attractions, related behaviors, and membership in a community of others who share those attractions". Androphilia and gynephilia are terms used in behavioral science to describe sexual orientation as an alternative to a gender binary conceptualization. Androphilia describes sexual attraction to masculinity; gynephilia describes the sexual attraction to femininity. The term sexual preference largely overlaps with sexual orientation, but is generally distinguished in psychological research. A person who identifies as bisexual, for example, may sexually prefer one sex over the other. Sexual preference may also suggest a degree of voluntary choice, whereas sexual orientation is not a choice. Scientists do not know the exact cause of sexual orientation, but they theorize that it is caused by a complex interplay of genetic, hormonal, and environmental influences. Although no single theory on the cause of sexual orientation has yet gained widespread support, scientists favor biologically based theories. There is considerably more evidence supporting nonsocial, biological causes of sexual orientation than social ones, especially for males. There is no substantive evidence which suggests parenting or early childhood experiences play a role with regard to sexual orientation. Across cultures, most people are heterosexual, with a minority of people having a homosexual or bisexual orientation. A person's sexual orientation can be anywhere on a continuum, from exclusive attraction to the opposite sex to exclusive attraction to the same sex. Sexual orientation is studied primarily within biology, neuroscience, and psychology (including sexology), but it is also a subject area in sociology, history (including social constructionist perspectives), and law.

The exact causes for the development of a particular sexual orientation have yet to be established. To date, much research has been conducted to determine the influence of genetics, hormonal action, development dynamics, social and cultural influences—which has led many to think that biology and environment factors play a complex role in forming it.

projected-21476519-026

https://en.wikipedia.org/wiki/Ramesses%20II

Ramesses II

In popular culture

Ramesses II ( Rīʿa-məsī-sū, , meaning "Ra is the one who bore him"; ), commonly known as Ramesses the Great, was the third pharaoh of the Nineteenth Dynasty of Egypt. Along with Thutmose III he is often regarded as the greatest, most celebrated, and most powerful pharaoh of the New Kingdom, itself the most powerful period of Ancient Egypt. The name Ramesses is pronounced variously . Other spellings include Rameses and Ramses; in . He is known as Ozymandias in Greek sources (), from the first part of Ramesses's regnal name, , "The Maat of Ra is powerful, Chosen of Ra". His successors and later Egyptians called him the "Great Ancestor". At age fourteen, he was appointed prince regent by his father, Seti I. Most Egyptologists today believe he assumed the throne on 31 May 1279 BC, based on his known accession date of III Season of the Harvest, day 27. The early part of his reign was focused on building cities, temples, and monuments. He established the city of Pi-Ramesses in the Nile Delta as his new capital and used it as the main base for his campaigns in Syria. He led several military expeditions into the Levant, reasserting Egyptian control over Canaan and Phoenicia. He also led expeditions to the south, into Nubia, commemorated in inscriptions at Beit el-Wali and Gerf Hussein. He celebrated an unprecedented thirteen or fourteen Sed festivals during his reign—more than any other pharaoh. Estimates of his age at death vary; 90 or 91 is considered most likely. On his death, he was buried in a tomb in the Valley of the Kings; his body was later moved to a royal cache where it was discovered in 1881. It is now on display in the National Museum of Egyptian Civilization.

Ramesses is the basis for Percy Bysshe Shelley's poem "Ozymandias". Diodorus Siculus gives an inscription on the base of one of his sculptures as: "King of Kings am I, Osymandias. If anyone would know how great I am and where I lie, let him surpass one of my works." This is paraphrased in Shelley's poem. The life of Ramesses II has inspired many fictional representations, including the historical novels of the French writer Christian Jacq, the Ramsès series; the graphic novel Watchmen, in which the character of Adrian Veidt uses Ramesses II to form part of the inspiration for his alter-ego, Ozymandias; Norman Mailer's novel Ancient Evenings, which is largely concerned with the life of Ramesses II, though from the perspective of Egyptians living during the reign of Ramesses IX; and the Anne Rice book The Mummy, or Ramses the Damned (1989), in which Ramesses was the main character. In The Kane Chronicles Ramesses is an ancestor of the main characters Sadie and Carter Kane. Ramesses II is one of the characters in the video game Civilization V. The East Village underground rock band The Fugs released their song "Ramses II Is Dead, My Love" on their 1968 album It Crawled into My Hand, Honest.

projected-00029812-032

https://en.wikipedia.org/wiki/The%20Beatles

The Beatles

Personnel

The Beatles were an English rock band, formed in Liverpool in 1960, that comprised John Lennon, Paul McCartney, George Harrison and Ringo Starr. They are regarded as the most influential band of all time and were integral to the development of 1960s counterculture and popular music's recognition as an art form. Rooted in skiffle, beat and 1950s rock 'n' roll, their sound incorporated elements of classical music and traditional pop in innovative ways; the band also explored music styles ranging from folk and Indian music to psychedelia and hard rock. As pioneers in recording, songwriting and artistic presentation, the Beatles revolutionised many aspects of the music industry and were often publicised as leaders of the era's youth and sociocultural movements. Led by primary songwriters Lennon and McCartney, the Beatles evolved from Lennon's previous group, the Quarrymen, and built their reputation playing clubs in Liverpool and Hamburg over three years from 1960, initially with Stuart Sutcliffe playing bass. The core trio of Lennon, McCartney and Harrison, together since 1958, went through a succession of drummers, including Pete Best, before asking Starr to join them in 1962. Manager Brian Epstein moulded them into a professional act, and producer George Martin guided and developed their recordings, greatly expanding their domestic success after signing to EMI Records and achieving their first hit, "Love Me Do", in late 1962. As their popularity grew into the intense fan frenzy dubbed "Beatlemania", the band acquired the nickname "the Fab Four", with Epstein, Martin or another member of the band's entourage sometimes informally referred to as a "fifth Beatle". By early 1964, the Beatles were international stars and had achieved unprecedented levels of critical and commercial success. They became a leading force in Britain's cultural resurgence, ushering in the British Invasion of the United States pop market, and soon made their film debut with A Hard Day's Night (1964). A growing desire to refine their studio efforts, coupled with the untenable nature of their concert tours, led to the band's retirement from live performances in 1966. At this time, they produced records of greater sophistication, including the albums Rubber Soul (1965), Revolver (1966) and Sgt. Pepper's Lonely Hearts Club Band (1967), and enjoyed further commercial success with The Beatles (also known as "the White Album", 1968) and Abbey Road (1969). The success of these records heralded the album era, as albums became the dominant form of record consumption over singles; they also increased public interest in psychedelic drugs and Eastern spirituality, and furthered advancements in electronic music, album art and music videos. In 1968, they founded Apple Corps, a multi-armed multimedia corporation that continues to oversee projects related to the band's legacy. After the group's break-up in 1970, all principal former members enjoyed success as solo artists and some partial reunions have occurred. Lennon was murdered in 1980 and Harrison died of lung cancer in 2001. McCartney and Starr remain musically active. The Beatles are the best-selling music act of all time, with estimated sales of 600 million units worldwide. They hold the record for most number-one albums on the UK Albums Chart (15), most number-one hits on the US Billboard Hot 100 chart (20), and most singles sold in the UK (21.9 million). The band received many accolades, including seven Grammy Awards, four Brit Awards, an Academy Award (for Best Original Song Score for the 1970 documentary film Let It Be) and fifteen Ivor Novello Awards. They were inducted into the Rock and Roll Hall of Fame in 1988, and each principal member was inducted individually between 1994 and 2015. In 2004 and 2011, the group topped Rolling Stones lists of the greatest artists in history. Time magazine named them among the 20th century's 100 most important people.

Principal members John Lennon – vocals, guitars, keyboards, harmonica, bass (1960–1969; died 1980) Paul McCartney – vocals, bass, guitars, keyboards, drums (1960–1970) George Harrison – guitars, vocals, sitar, keyboards, bass (1960–1970; died 2001) Ringo Starr – drums, percussion, vocals (1962–1970) Early members Pete Best – drums, vocals (1960–1962) Stuart Sutcliffe – bass, vocals (1960–1961; died 1962) Chas Newby – bass (1960–1961) Norman Chapman – drums (1960; died 1995) Tommy Moore – drums (1960; died 1981) Touring musician Jimmie Nicol – drums (1964)

projected-00029969-001

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

Tea

Etymology

Tea or cha is an aromatic beverage prepared by pouring hot or boiling water over cured or fresh leaves of Camellia sinensis, an evergreen shrub native to East Asia which probably originated in the borderlands of southwestern China and northern Myanmar. Tea is also rarely made from the leaves of Camellia taliensis. After plain water, tea is the most widely consumed drink in the world. There are many different types of tea; some have a cooling, slightly bitter, and astringent flavour, while others have vastly different profiles that include sweet, nutty, floral, or grassy notes. Tea has a stimulating effect in humans primarily due to its caffeine content. An early credible record of tea drinking dates to the third century AD, in a medical text written by Chinese physician Hua Tuo. It was popularised as a recreational drink during the Chinese Tang dynasty, and tea drinking subsequently spread to other East Asian countries. Portuguese priests and merchants introduced it to Europe during the 16th century. During the 17th century, drinking tea became fashionable among the English, who started to plant tea on a large scale in British India. The term herbal tea refers to drinks not made from Camellia sinensis. They are the infusions of fruit, leaves, or other plant parts, such as steeps of rosehip, chamomile, or rooibos. These may be called tisanes or herbal infusions to prevent confusion with tea made from the tea plant.

The etymology of the various words for tea reflects the history of transmission of tea drinking culture and trade from China to countries around the world. Nearly all of the words for tea worldwide fall into three broad groups: te, cha and chai, present in English as tea, cha or char, and chai. The earliest of the three to enter English is cha, which came in the 1590s via the Portuguese, who traded in Macao and picked up the Cantonese pronunciation of the word. The more common tea form arrived in the 17th century via the Dutch, who acquired it either indirectly from the Malay teh, or directly from the tê pronunciation in Min Chinese. The third form chai (meaning "spiced tea") originated from a northern Chinese pronunciation of cha, which travelled overland to Central Asia and Persia where it picked up a Persian ending yi.

projected-21490957-038

https://en.wikipedia.org/wiki/Thomas%20Aquinas

Thomas Aquinas

Works

Thomas Aquinas, OP (; ; 1225 – 7 March 1274) was an Italian Dominican friar and priest, who was an immensely influential philosopher, theologian and jurist in the tradition of scholasticism; he is known within the scholastic tradition as the , the , and the . The name Aquinas identifies his ancestral origins in the county of Aquino in present-day Lazio, Italy. Among other things, he was a prominent proponent of natural theology and the father of a school of thought (encompassing both theology and philosophy) known as Thomism. He argued that God is the source of both the light of natural reason and the light of faith. He has been described as "the most influential thinker of the medieval period" and "the greatest of the medieval philosopher-theologians". His influence on Western thought is considerable, and much of modern philosophy is derived from his ideas, particularly in the areas of ethics, natural law, metaphysics, and political theory. Unlike many currents in the Catholic Church of the time, Thomas embraced several ideas put forward by Aristotle—whom he called "the Philosopher"—and attempted to synthesize Aristotelian philosophy with the principles of Christianity. His best-known works are the Disputed Questions on Truth (1256–1259), the Summa contra Gentiles (1259–1265), and the unfinished but massively influential Summa Theologica, or Summa Theologiae (1265–1274). His commentaries on Scripture and on Aristotle also form an important part of his body of work. Furthermore, Thomas is distinguished for his eucharistic hymns, which form a part of the church's liturgy. The Catholic Church honors Thomas Aquinas as a saint and regards him as the model teacher for those studying for the priesthood, and indeed the highest expression of both natural reason and speculative theology. In modern times, under papal directives, the study of his works was long used as a core of the required program of study for those seeking ordination as priests or deacons, as well as for those in religious formation and for other students of the sacred disciplines (philosophy, Catholic theology, church history, liturgy, and canon law). As a Doctor of the Church, Thomas Aquinas is considered one of the Catholic Church's greatest theologians and philosophers. Pope Benedict XV declared: "This (Dominican) Order... acquired new luster when the Church declared the teaching of Thomas to be her own and that Doctor, honored with the special praises of the Pontiffs, the master and patron of Catholic schools."

The first edition of Thomas's complete works, the so-called editio Piana (from Pius V, the Dominican Pope who commissioned it), was produced in 1570 at the studium of the Roman convent at Santa Maria sopra Minerva, the forerunner of the Pontifical University of Saint Thomas Aquinas, Angelicum. The critical edition of Thomas's works is the ongoing edition commissioned by Pope Leo XIII (1882–1903), the so-called Leonine Edition. Most of his major works have now been edited: the Summa Theologiae in nine volumes during 1888–1906, the Summa contra Gentiles in three volumes during 1918–1930. Abbé Migne published an edition of the Summa Theologiae, in four volumes, as an appendix to his Patrologiae Cursus Completus (English editions: Joseph Rickaby 1872, J.M. Ashley 1888). Electronic texts of mostly the Leonine Edition are maintained online by the Corpus Thomisticum by Enrique Alarcón, University of Navarra, and at Documenta Catholica Omnia.

projected-04576465-015

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

Flower

Function

A flower, sometimes known as a bloom or blossom, is the reproductive structure found in flowering plants (plants of the division Angiospermae). The biological function of a flower is to facilitate reproduction, usually by providing a mechanism for the union of sperm with eggs. Flowers may facilitate outcrossing (fusion of sperm and eggs from different individuals in a population) resulting from cross-pollination or allow selfing (fusion of sperm and egg from the same flower) when self-pollination occurs. There are two types of pollination: self-pollination and cross-pollination. Self-pollination occurs when the pollen from the anther is deposited on the stigma of the same flower, or another flower on the same plant. Cross-pollination is when pollen is transferred from the anther of one flower to the stigma of another flower on a different individual of the same species. Self-pollination happens in flowers where the stamen and carpel mature at the same time, and are positioned so that the pollen can land on the flower's stigma. This pollination does not require an investment from the plant to provide nectar and pollen as food for pollinators. Some flowers produce diaspores without fertilization (parthenocarpy). Flowers contain sporangia and are the site where gametophytes develop. Many flowers have evolved to be attractive to animals, so as to cause them to be vectors for the transfer of pollen. After fertilization, the ovary of the flower develops into fruit containing seeds. In addition to facilitating the reproduction of flowering plants, flowers have long been admired and used by humans to bring beauty to the environment, and also as objects of romance, ritual, esotericism, witchcraft, religion, holistic medicine, and as a source of food.

The principal purpose of a flower is the reproduction of the individual and the species. All flowering plants are heterosporous, that is, every individual plant produces two types of spores. Microspores are produced by meiosis inside anthers and megaspores are produced inside ovules that are within an ovary. Anthers typically consist of four microsporangia and an ovule is an integumented megasporangium. Both types of spores develop into gametophytes inside sporangia. As with all heterosporous plants, the gametophytes also develop inside the spores, i. e., they are endosporic. In the majority of plant species, individual flowers have both functional carpels and stamens. Botanists describe these flowers as perfect or bisexual, and the species as hermaphroditic. In a minority of plant species, their flowers lack one or the other reproductive organ and are described as imperfect or unisexual. If the individual plants of a species each have unisexual flowers of both sexes then the species is monoecious. Alternatively, if each individual plant has only unisexual flowers of the same sex then the species is dioecious.

wit-train-topic-001562514

projected-00030677-001

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

Tool

Definition

A tool is an object that can extend an individual's ability to modify features of the surrounding environment. Although many animals use simple tools, only human beings, whose use of stone tools dates back hundreds of millennia, have been observed using tools to make other tools. Early human tools, made of such materials as stone, bone, and wood, were used for preparation of food, hunting, manufacture of weapons, and working of materials to produce clothing and useful artifacts. The development of metalworking made additional types of tools possible. Harnessing energy sources, such as animal power, wind, or steam, allowed increasingly complex tools to produce an even larger range of items, with the Industrial Revolution marking an inflection point in the use of tools. The introduction of widespread automation in the 19th and 20th centuries allowed tools to operate with minimal human supervision, further increasing the productivity of human labor.

While a common-sense understanding of the meaning of tool is widespread, several formal definitions have been proposed. In 1981, Benjamin Beck published a widely used definition of tool use. This has been modified to:Other, briefer definitions have been proposed:

projected-00032538-001

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

Viking Age

Historical context

The Viking Age (793–1066 AD) was the period during the Middle Ages when Norsemen known as Vikings undertook large-scale raiding, colonizing, conquest, and trading throughout Europe and reached North America. It followed the Migration Period and the Germanic Iron Age. The Viking Age applies not only to their homeland of Scandinavia but also to any place significantly settled by Scandinavians during the period. The Scandinavians of the Viking Age are often referred to as Vikings as well as Norsemen, although few of them were Vikings in sense of being engaged in piracy. Voyaging by sea from their homelands in Denmark, Norway, and Sweden, the Norse people settled in the British Isles, Ireland, the Faroe Islands, Iceland, Greenland, Normandy, and the Baltic coast and along the Dnieper and Volga trade routes in eastern Europe, where they were also known as Varangians. They also briefly settled in Newfoundland, becoming the first Europeans to reach North America. The Norse-Gaels, Normans, Rus' people, Faroese, and Icelanders emerged from these Norse colonies. The Vikings founded several kingdoms and earldoms in Europe: the kingdom of the Isles (Suðreyjar), Orkney (Norðreyjar), York (Jórvík) and the Danelaw (Danalǫg), Dublin (Dyflin), Normandy, and Kievan Rus' (Garðaríki). The Norse homelands were also unified into larger kingdoms during the Viking Age, and the short-lived North Sea Empire included large swathes of Scandinavia and Britain. In 1021, the Vikings achieved the feat of reaching North America—the date of which was not specified until a millennium later. Several things drove this expansion. The Vikings were drawn by the growth of wealthy towns and monasteries overseas and weak kingdoms. They may also have been pushed to leave their homeland by overpopulation, lack of good farmland, and political strife arising from the unification of Norway. The aggressive expansion of the Carolingian Empire and forced conversion of the neighboring Saxons to Christianity may also have been a factor. Sailing innovations had allowed the Vikings to sail further and longer to begin with. Information about the Viking Age is drawn largely from primary sources written by those the Vikings encountered, as well as archaeology, supplemented with secondary sources such as the Icelandic Sagas.

In England, the Viking attack of 8 June 793 that destroyed the abbey on Lindisfarne, a centre of learning on an island off the northeast coast of England in Northumberland, is regarded as the beginning of the Viking Age. Judith Jesch has argued that the start of the Viking Age can be pushed back to 700–750, as it was unlikely that the Lindisfarne attack was the first attack and given archeological evidence that suggests contacts between Scandinavia and the British isles earlier in the century. The earliest raids were most likely small in scale, but expanded in scale during the 9th century. In the Lindisfarne attack, monks were killed in the abbey, thrown into the sea to drown, or carried away as slaves along with the church treasures, giving rise to the traditional (but unattested) prayer—A furore Normannorum libera nos, Domine, "Free us from the fury of the Northmen, Lord." Three Viking ships had beached in Weymouth Bay four years earlier (although due to a scribal error the Anglo-Saxon Chronicle dates this event to 787 rather than 789), but that incursion may have been a trading expedition that went wrong rather than a piratical raid. Lindisfarne was different. The Viking devastation of Northumbria's Holy Island was reported by the Northumbrian scholar Alcuin of York, who wrote: "Never before in Britain has such a terror appeared". Vikings were portrayed as wholly violent and bloodthirsty by their enemies. In medieval English chronicles, they are described as "wolves among sheep". The first challenges to the many anti-Viking images in Britain emerged in the 17th century. Pioneering scholarly works on the Viking Age reached a small readership in Britain. Linguistics traced the Viking Age origins of rural idioms and proverbs. New dictionaries of the Old Norse language enabled more Victorians to read the Icelandic Sagas. In Scandinavia, the 17th-century Danish scholars Thomas Bartholin and Ole Worm and Swedish scholar Olaus Rudbeck were the first to use runic inscriptions and Icelandic Sagas as primary historical sources. During the Enlightenment and Nordic Renaissance, historians such as the Icelandic-Norwegian Thormodus Torfæus, Danish-Norwegian Ludvig Holberg, and Swedish Olof von Dalin developed a more "rational" and "pragmatic" approach to historical scholarship. By the latter half of the 18th century, while the Icelandic sagas were still used as important historical sources, the Viking Age had again come to be regarded as a barbaric and uncivilised period in the history of the Nordic countries. Scholars outside Scandinavia did not begin to extensively reassess the achievements of the Vikings until the 1890s, recognising their artistry, technological skills, and seamanship.

projected-20110824-001

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

Infinity

History

Infinity is that which is boundless, endless, or larger than any natural number. It is often denoted by the infinity symbol . Since the time of the ancient Greeks, the philosophical nature of infinity was the subject of many discussions among philosophers. In the 17th century, with the introduction of the infinity symbol and the infinitesimal calculus, mathematicians began to work with infinite series and what some mathematicians (including l'Hôpital and Bernoulli) regarded as infinitely small quantities, but infinity continued to be associated with endless processes. As mathematicians struggled with the foundation of calculus, it remained unclear whether infinity could be considered as a number or magnitude and, if so, how this could be done. At the end of the 19th century, Georg Cantor enlarged the mathematical study of infinity by studying infinite sets and infinite numbers, showing that they can be of various sizes. For example, if a line is viewed as the set of all of its points, their infinite number (i.e., the cardinality of the line) is larger than the number of integers. In this usage, infinity is a mathematical concept, and infinite mathematical objects can be studied, manipulated, and used just like any other mathematical object. The mathematical concept of infinity refines and extends the old philosophical concept, in particular by introducing infinitely many different sizes of infinite sets. Among the axioms of Zermelo–Fraenkel set theory, on which most of modern mathematics can be developed, is the axiom of infinity, which guarantees the existence of infinite sets. The mathematical concept of infinity and the manipulation of infinite sets are used everywhere in mathematics, even in areas such as combinatorics that may seem to have nothing to do with them. For example, Wiles's proof of Fermat's Last Theorem implicitly relies on the existence of very large infinite sets for solving a long-standing problem that is stated in terms of elementary arithmetic. In physics and cosmology, whether the Universe is infinite is an open question.

Ancient cultures had various ideas about the nature of infinity. The ancient Indians and the Greeks did not define infinity in precise formalism as does modern mathematics, and instead approached infinity as a philosophical concept.

projected-00033183-001

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

Woman

Etymology

A woman is an adult female human. Prior to adulthood, a female human is referred to as a girl (a female child or adolescent). The plural women is sometimes used in certain phrases such as "women's rights" to denote female humans regardless of age. Typically, women inherit a pair of X chromosomes from their parents, and are capable of pregnancy and giving birth from puberty until menopause. More generally, sex differentiation of the female fetus is governed by the lack of a present, or functioning, SRY-gene on either one of the respective sex chromosomes. Female anatomy is distinguished from male anatomy by the female reproductive system, which includes the ovaries, fallopian tubes, uterus, vagina, and vulva. The adult female pelvis is wider, the hips broader, and the breasts larger than that of adult males. Women have significantly less facial and other body hair, have a higher body fat composition, and are on average shorter and less muscular than men. Throughout human history, traditional gender roles have often defined and limited women's activities and opportunities; many religious doctrines stipulate certain rules for women. With restrictions loosening during the 20th century in many societies, women have gained access to careers beyond the traditional homemaker, and the ability to pursue higher education. Violence against women, whether within families or in communities, has a long history and is primarily committed by men. Some women are denied reproductive rights. The movements and ideologies of feminism have a shared goal of achieving gender equality. Trans women have a gender identity that does not align with their male sex assignment at birth, while intersex women may have sex characteristics that do not fit typical notions of female biology.

The spelling of "woman" in English has progressed over the past millennium from wīfmann to wīmmann to wumman, and finally, the modern spelling woman. In Old English, wīfmann meant "woman" (literally "woman-person"), whereas wer meant "man". Mann had a gender-neutral meaning of "human", corresponding to Modern English "person" or "someone"; however, subsequent to the Norman Conquest, man began to be used more in reference to "male human", and by the late 13th century it had begun to eclipse usage of the older term wer. The medial labial consonants f and m in wīfmann coalesced into the modern form "woman", while the initial element wīf, which had also meant "woman", underwent semantic narrowing to the sense of a married woman ("wife"). It is a popular misconception that the term "woman" is etymologically connected to "womb". "Womb" derives from the Old English word wamb meaning "belly, uterus" (cognate to the modern German colloquial term "Wamme" from Old High German wamba for "belly, paunch, lap").

projected-00033183-013

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

Woman

History

A woman is an adult female human. Prior to adulthood, a female human is referred to as a girl (a female child or adolescent). The plural women is sometimes used in certain phrases such as "women's rights" to denote female humans regardless of age. Typically, women inherit a pair of X chromosomes from their parents, and are capable of pregnancy and giving birth from puberty until menopause. More generally, sex differentiation of the female fetus is governed by the lack of a present, or functioning, SRY-gene on either one of the respective sex chromosomes. Female anatomy is distinguished from male anatomy by the female reproductive system, which includes the ovaries, fallopian tubes, uterus, vagina, and vulva. The adult female pelvis is wider, the hips broader, and the breasts larger than that of adult males. Women have significantly less facial and other body hair, have a higher body fat composition, and are on average shorter and less muscular than men. Throughout human history, traditional gender roles have often defined and limited women's activities and opportunities; many religious doctrines stipulate certain rules for women. With restrictions loosening during the 20th century in many societies, women have gained access to careers beyond the traditional homemaker, and the ability to pursue higher education. Violence against women, whether within families or in communities, has a long history and is primarily committed by men. Some women are denied reproductive rights. The movements and ideologies of feminism have a shared goal of achieving gender equality. Trans women have a gender identity that does not align with their male sex assignment at birth, while intersex women may have sex characteristics that do not fit typical notions of female biology.

The earliest women whose names are known include: Neithhotep (c. 3200 BCE), the wife of Narmer and the first queen of ancient Egypt. Merneith (c. 3000 BCE), consort and regent of ancient Egypt during the first dynasty. She may have been ruler of Egypt in her own right. Peseshet (c. 2600 BCE), a physician in Ancient Egypt. Puabi (c. 2600 BCE), or Shubad – queen of Ur whose tomb was discovered with many expensive artifacts. Other known pre-Sargonic queens of Ur (royal wives) include Ashusikildigir, Ninbanda, and Gansamannu. Kugbau (circa 2,500 BCE), a taverness from Kish chosen by the Nippur priesthood to become hegemonic ruler of Sumer, and in later ages deified as "Kubaba". Tashlultum (c. 2400 BCE), Akkadian queen, wife of Sargon of Akkad and mother of Enheduanna. Baranamtarra (c. 2384 BCE), prominent and influential queen of Lugalanda of Lagash. Other known pre-Sargonic queens of the first Lagash dynasty include Menbara-abzu, Ashume'eren, Ninkhilisug, Dimtur, and Shagshag, and the names of several princesses are also known. Enheduanna (c. 2285 BCE), the high priestess of the temple of the Moon God in the Sumerian city-state of Ur and possibly the first known poet and first named author of either gender. Shibtu (c. 1775 BCE), king Zimrilim's consort and queen of the Syrian city-state of Mari. During her husband's absence, she ruled as regent of Mari and enjoyed extensive administrative powers as queen.

projected-00033306-001

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

Water

Etymology

Water (chemical formula ) is an inorganic, transparent, tasteless, odorless, and nearly colorless chemical substance, which is the main constituent of Earth's hydrosphere and the fluids of all known living organisms (in which it acts as a solvent). It is vital for all known forms of life, despite providing neither food, energy, nor organic micronutrients. Its chemical formula, H2O, indicates that each of its molecules contains one oxygen and two hydrogen atoms, connected by covalent bonds. The hydrogen atoms are attached to the oxygen atom at an angle of 104.45°. "Water" is also the name of the liquid state of H2O at standard temperature and pressure. A number of natural states of water exist. It forms precipitation in the form of rain and aerosols in the form of fog. Clouds consist of suspended droplets of water and ice, its solid state. When finely divided, crystalline ice may precipitate in the form of snow. The gaseous state of water is steam or water vapor. Water covers about 71% of the Earth's surface, with seas and oceans making up most of the water volume on earth (about 96.5%). Small portions of water occur as groundwater (1.7%), in the glaciers and the ice caps of Antarctica and Greenland (1.7%), and in the air as vapor, clouds (consisting of ice and liquid water suspended in air), and precipitation (0.001%). Water moves continually through the water cycle of evaporation, transpiration (evapotranspiration), condensation, precipitation, and runoff, usually reaching the sea. Water plays an important role in the world economy. Approximately 70% of the freshwater used by humans goes to agriculture. Fishing in salt and fresh water bodies has been, and continues to be a major source of food for many parts of the world, providing 6.5% of global protein. Much of the long-distance trade of commodities (such as oil, natural gas, and manufactured products) is transported by boats through seas, rivers, lakes, and canals. Large quantities of water, ice, and steam are used for cooling and heating, in industry and homes. Water is an excellent solvent for a wide variety of substances both mineral and organic; as such it is widely used in industrial processes, and in cooking and washing. Water, ice and snow are also central to many sports and other forms of entertainment, such as swimming, pleasure boating, boat racing, surfing, sport fishing, diving, ice skating and skiing.

The word water comes from Old English , from Proto-Germanic *watar (source also of Old Saxon , Old Frisian , Dutch , Old High German , German , , Gothic (), from Proto-Indo-European *wod-or, suffixed form of root *wed- ("water"; "wet"). Also cognate, through the Indo-European root, with Greek (), Russian (), Irish , and Albanian .

projected-00034341-002

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

Year

Intercalation

A year or annus is the orbital period of a planetary body, for example, the Earth, moving in its orbit around the Sun. Due to the Earth's axial tilt, the course of a year sees the passing of the seasons, marked by change in weather, the hours of daylight, and, consequently, vegetation and soil fertility. In temperate and subpolar regions around the planet, four seasons are generally recognized: spring, summer, autumn and winter. In tropical and subtropical regions, several geographical sectors do not present defined seasons; but in the seasonal tropics, the annual wet and dry seasons are recognized and tracked. A calendar year is an approximation of the number of days of the Earth's orbital period, as counted in a given calendar. The Gregorian calendar, or modern calendar, presents its calendar year to be either a common year of 365 days or a leap year of 366 days, as do the Julian calendars. For the Gregorian calendar, the average length of the calendar year (the mean year) across the complete leap cycle of 400 years is 365.2425 days (97 out of 400 years are leap years). In English, the unit of time for year is commonly abbreviated as "y" or "yr". The symbol "a" is more common in scientific literature, though its exact duration may be inconsistent. In astronomy, the Julian year is a unit of time defined as 365.25 days of exactly 86,400 seconds (SI base unit), totalling exactly 31,557,600 seconds in the Julian astronomical year. The word year is also used for periods loosely associated with, but not identical to, the calendar or astronomical year, such as the seasonal year, the fiscal year, the academic year, etc. Similarly, year can mean the orbital period of any planet; for example, a Martian year and a Venusian year are examples of the time a planet takes to transit one complete orbit. The term can also be used in reference to any long period or cycle, such as the Great Year.

Astronomical years do not have an integer number of days or lunar months. Any calendar that follows an astronomical year must have a system of intercalation such as leap years.

projected-00034341-007

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

Year

Pragmatic divisions

A year or annus is the orbital period of a planetary body, for example, the Earth, moving in its orbit around the Sun. Due to the Earth's axial tilt, the course of a year sees the passing of the seasons, marked by change in weather, the hours of daylight, and, consequently, vegetation and soil fertility. In temperate and subpolar regions around the planet, four seasons are generally recognized: spring, summer, autumn and winter. In tropical and subtropical regions, several geographical sectors do not present defined seasons; but in the seasonal tropics, the annual wet and dry seasons are recognized and tracked. A calendar year is an approximation of the number of days of the Earth's orbital period, as counted in a given calendar. The Gregorian calendar, or modern calendar, presents its calendar year to be either a common year of 365 days or a leap year of 366 days, as do the Julian calendars. For the Gregorian calendar, the average length of the calendar year (the mean year) across the complete leap cycle of 400 years is 365.2425 days (97 out of 400 years are leap years). In English, the unit of time for year is commonly abbreviated as "y" or "yr". The symbol "a" is more common in scientific literature, though its exact duration may be inconsistent. In astronomy, the Julian year is a unit of time defined as 365.25 days of exactly 86,400 seconds (SI base unit), totalling exactly 31,557,600 seconds in the Julian astronomical year. The word year is also used for periods loosely associated with, but not identical to, the calendar or astronomical year, such as the seasonal year, the fiscal year, the academic year, etc. Similarly, year can mean the orbital period of any planet; for example, a Martian year and a Venusian year are examples of the time a planet takes to transit one complete orbit. The term can also be used in reference to any long period or cycle, such as the Great Year.

Financial and scientific calculations often use a 365-day calendar to simplify daily rates.

projected-18603746-001

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

Beijing

Etymology

Beijing ( ; ; ), alternatively romanized as Peking ( ), is the capital of the People's Republic of China. It is the political center, cultural center, international communication center and scientific and technological innovation center of the country. Beijing is the world's most populous national capital city, with over 21 million residents within an administrative area of 16,410.5 km2 (6336 sq. mi.). Nevertheless, its built-up area, the third largest in China after Guangzhou and Shanghai, is slightly bigger, including three districts in Hebei (Sanhe, Dachang Hui and Zhuozhou) being conurbated but with Miyun and Pinggu Districts in Beijing not agglomerated yet. It is located in Northern China, and is governed as a municipality under the direct administration of the State Council with 16 urban, suburban, and rural districts. Beijing is mostly surrounded by Hebei Province with the exception of neighboring Tianjin to the southeast; together, the three divisions form the Jingjinji megalopolis and the national capital region of China. Beijing is a global city and one of the world's leading centres for culture, diplomacy, politics, finance, business and economics, education, research, language, tourism, media, sport, science and technology and transportation. As a megacity, Beijing is the second largest Chinese city by urban population after Shanghai. It is home to the headquarters of most of China's largest state-owned companies and houses the largest number of Fortune Global 500 companies in the world, as well as the world's four biggest financial institutions by total assets. It is also a major hub for the national highway, expressway, railway, and high-speed rail networks. The Beijing Capital International Airport has been the second busiest in the world by passenger traffic (Asia's busiest) since 2010, and, , the city's subway network is the busiest and longest in the world. The Beijing Daxing International Airport, a second international airport in Beijing, is the largest single-structure airport terminal in the world. Combining both modern and traditional style architectures, Beijing is one of the oldest cities in the world, with a rich history dating back over three millennia. As the last of the Four Great Ancient Capitals of China, Beijing has been the political center of the country for most of the past eight centuries, and was the largest city in the world by population for much of the second millennium CE. With mountains surrounding the inland city on three sides, in addition to the old inner and outer city walls, Beijing was strategically poised and developed to be the residence of the emperor and thus was the perfect location for the imperial capital. The city is renowned for its opulent palaces, temples, parks, gardens, tombs, walls and gates. Beijing is one of the most important tourist destinations of the world. In 2018, Beijing was the second highest earning tourist city in the world after Shanghai. Beijing is home to many national monuments and museums and has seven UNESCO World Heritage Sites—the Forbidden City, Temple of Heaven, Summer Palace, Ming Tombs, Zhoukoudian, and parts of the Great Wall and the Grand Canal—all of which are popular tourist locations. Siheyuans, the city's traditional housing style, and hutongs, the narrow alleys between siheyuans, are major tourist attractions and are common in urban Beijing. Many of Beijing's public universities consistently rank among the best in the Asia-Pacific and the world. Beijing is home to the two best C9 League universities (Tsinghua and Peking) in Asia & Oceania region and emerging countries. Beijing CBD is a center for Beijing's economic expansion, with the ongoing or recently completed construction of multiple skyscrapers. Beijing's Zhongguancun area is a world leading center of scientific and technological innovation as well as entrepreneurship. Beijing has been ranked the city with the largest scientific research output by the Nature Index since 2016. The city has hosted numerous international and national sporting events, the most notable being the 2008 Summer Olympics and 2008 Summer Paralympics Games. In 2022, Beijing became the first city ever to host both the Summer and Winter Olympics, and also the Summer and Winter Paralympics. Beijing hosts 175 foreign embassies as well as the headquarters of many organizations, including the Asian Infrastructure Investment Bank (AIIB), the Shanghai Cooperation Organisation (SCO), the Silk Road Fund, the Chinese Academy of Sciences, the Chinese Academy of Engineering, the Chinese Academy of Social Sciences, the Central Academy of Fine Arts, the Central Academy of Drama, the Central Conservatory of Music, and the Red Cross Society of China.

Over the past 3,000 years, the city of Beijing has had numerous other names. The name Beijing, which means "Northern Capital" (from the Chinese characters for north and for capital), was applied to the city in 1403 during the Ming dynasty to distinguish the city from Nanjing (the "Southern Capital"). The English spelling Beijing is based on the government's official romanization (adopted in the 1980s) of the two characters as they are pronounced in Standard Mandarin. An older English spelling, Peking, was used by Jesuit missionary Martino Martini in a popular atlas published in Amsterdam in 1655. Although Peking is no longer the common name for the city, some of the city's older locations and facilities, such as Beijing Capital International Airport, with the IATA Code PEK, and Peking University, still retain the former romanization. The single Chinese character abbreviation for Beijing is , which appears on automobile license plates in the city. The official Latin alphabet abbreviation for Beijing is "BJ".

projected-18603746-024

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

Beijing

Demographics

Beijing ( ; ; ), alternatively romanized as Peking ( ), is the capital of the People's Republic of China. It is the political center, cultural center, international communication center and scientific and technological innovation center of the country. Beijing is the world's most populous national capital city, with over 21 million residents within an administrative area of 16,410.5 km2 (6336 sq. mi.). Nevertheless, its built-up area, the third largest in China after Guangzhou and Shanghai, is slightly bigger, including three districts in Hebei (Sanhe, Dachang Hui and Zhuozhou) being conurbated but with Miyun and Pinggu Districts in Beijing not agglomerated yet. It is located in Northern China, and is governed as a municipality under the direct administration of the State Council with 16 urban, suburban, and rural districts. Beijing is mostly surrounded by Hebei Province with the exception of neighboring Tianjin to the southeast; together, the three divisions form the Jingjinji megalopolis and the national capital region of China. Beijing is a global city and one of the world's leading centres for culture, diplomacy, politics, finance, business and economics, education, research, language, tourism, media, sport, science and technology and transportation. As a megacity, Beijing is the second largest Chinese city by urban population after Shanghai. It is home to the headquarters of most of China's largest state-owned companies and houses the largest number of Fortune Global 500 companies in the world, as well as the world's four biggest financial institutions by total assets. It is also a major hub for the national highway, expressway, railway, and high-speed rail networks. The Beijing Capital International Airport has been the second busiest in the world by passenger traffic (Asia's busiest) since 2010, and, , the city's subway network is the busiest and longest in the world. The Beijing Daxing International Airport, a second international airport in Beijing, is the largest single-structure airport terminal in the world. Combining both modern and traditional style architectures, Beijing is one of the oldest cities in the world, with a rich history dating back over three millennia. As the last of the Four Great Ancient Capitals of China, Beijing has been the political center of the country for most of the past eight centuries, and was the largest city in the world by population for much of the second millennium CE. With mountains surrounding the inland city on three sides, in addition to the old inner and outer city walls, Beijing was strategically poised and developed to be the residence of the emperor and thus was the perfect location for the imperial capital. The city is renowned for its opulent palaces, temples, parks, gardens, tombs, walls and gates. Beijing is one of the most important tourist destinations of the world. In 2018, Beijing was the second highest earning tourist city in the world after Shanghai. Beijing is home to many national monuments and museums and has seven UNESCO World Heritage Sites—the Forbidden City, Temple of Heaven, Summer Palace, Ming Tombs, Zhoukoudian, and parts of the Great Wall and the Grand Canal—all of which are popular tourist locations. Siheyuans, the city's traditional housing style, and hutongs, the narrow alleys between siheyuans, are major tourist attractions and are common in urban Beijing. Many of Beijing's public universities consistently rank among the best in the Asia-Pacific and the world. Beijing is home to the two best C9 League universities (Tsinghua and Peking) in Asia & Oceania region and emerging countries. Beijing CBD is a center for Beijing's economic expansion, with the ongoing or recently completed construction of multiple skyscrapers. Beijing's Zhongguancun area is a world leading center of scientific and technological innovation as well as entrepreneurship. Beijing has been ranked the city with the largest scientific research output by the Nature Index since 2016. The city has hosted numerous international and national sporting events, the most notable being the 2008 Summer Olympics and 2008 Summer Paralympics Games. In 2022, Beijing became the first city ever to host both the Summer and Winter Olympics, and also the Summer and Winter Paralympics. Beijing hosts 175 foreign embassies as well as the headquarters of many organizations, including the Asian Infrastructure Investment Bank (AIIB), the Shanghai Cooperation Organisation (SCO), the Silk Road Fund, the Chinese Academy of Sciences, the Chinese Academy of Engineering, the Chinese Academy of Social Sciences, the Central Academy of Fine Arts, the Central Academy of Drama, the Central Conservatory of Music, and the Red Cross Society of China.

In 2013, Beijing had a total population of 21.148 million within the municipality, of which 18.251 million resided in urban districts or suburban townships and 2.897 million lived in rural villages. The encompassing metropolitan area was estimated by the OECD (Organisation for Economic Co-operation and Development) to have, , a population of 24.9 million. Within China, the city ranked second in urban population after Shanghai and the third in municipal population after Shanghai and Chongqing. Beijing also ranks among the most populous cities in the world, a distinction the city has held for much of the past 800 years, especially during the 15th to early 19th centuries when it was the largest city in the world. About 13 million of the city's residents in 2013 had local hukou permits, which entitles them to permanent residence in Beijing. The remaining 8 million residents had hukou permits elsewhere and were not eligible to receive some social benefits provided by the Beijing municipal government. The population increased in 2013 by 455,000 or about 7% from the previous year and continued a decade-long trend of rapid growth. The total population in 2004 was 14.213 million. The population gains are driven largely by migration. The population's rate of natural increase in 2013 was a mere 0.441%, based on a birth rate of 8.93 and a mortality rate of 4.52. The gender balance was 51.6% males and 48.4% females. Working age people account for nearly 80% of the population. Compared to 2004, residents age 0–14 as a proportion of the population dropped from 9.96% to 9.5% in 2013 and residents over the age of 65 declined from 11.12% to 9.2%. From 2000 to 2010, the percentage of city residents with at least some college education nearly doubled from 16.8% to 31.5%. About 22.2% have some high school education and 31% had reached middle school. According to the 2010 census, nearly 96% of Beijing's population are ethnic Han Chinese. Of the 800,000 ethnic minority population living in the capital, Manchu (336,000), Hui (249,000), Korean (77,000), Mongol (37,000) and Tujia (24,000) constitute the five largest groups. In addition, there were 8,045 Hong Kong residents, 500 Macau residents, and 7,772 Taiwan residents along with 91,128 registered foreigners living in Beijing. A study by the Beijing Academy of Sciences estimates that in 2010 there were on average 200,000 foreigners living in Beijing on any given day including students, business travellers and tourists that are not counted as registered residents. In 2017 the Chinese government implemented population controls for Beijing and Shanghai to fight what it called the "big city disease" which includes congestion, pollution, and shortages of education and health care services. From this policy, Beijing's population declined by 20,000 from 2016 to 2017. Some low-income people are being forcibly removed from the city as both legal and illegal housing is being demolished in some high-density residential neighborhoods. The population is being redistributed to Jing-Jin-Ji and Xiong'an New Area, the transfer to the latter expected to include 300,000-500,000 people working in government research, universities, and corporate headquarters.

projected-15368428-001

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

Radio

Technology

Radio is the technology of signaling and communicating using radio waves. Radio waves are electromagnetic waves of frequency between 30 hertz (Hz) and 300 gigahertz (GHz). They are generated by an electronic device called a transmitter connected to an antenna which radiates the waves, and received by another antenna connected to a radio receiver. Radio is very widely used in modern technology, in radio communication, radar, radio navigation, remote control, remote sensing, and other applications. In radio communication, used in radio and television broadcasting, cell phones, two-way radios, wireless networking, and satellite communication, among numerous other uses, radio waves are used to carry information across space from a transmitter to a receiver, by modulating the radio signal (impressing an information signal on the radio wave by varying some aspect of the wave) in the transmitter. In radar, used to locate and track objects like aircraft, ships, spacecraft and missiles, a beam of radio waves emitted by a radar transmitter reflects off the target object, and the reflected waves reveal the object's location. In radio navigation systems such as GPS and VOR, a mobile receiver accepts radio signals from navigational radio beacons whose position is known, and by precisely measuring the arrival time of the radio waves the receiver can calculate its position on Earth. In wireless radio remote control devices like drones, garage door openers, and keyless entry systems, radio signals transmitted from a controller device control the actions of a remote device. Applications of radio waves that do not involve transmitting the waves significant distances, such as RF heating used in industrial processes and microwave ovens, and medical uses such as diathermy and MRI machines, are not usually called radio. The noun radio is also used to mean a broadcast radio receiver. The existence of radio waves was first proven by German physicist Heinrich Hertz on November 11, 1886. In the mid 1890s, building on techniques physicists were using to study electromagnetic waves, Guglielmo Marconi developed the first apparatus for long-distance radio communication, sending a wireless Morse Code message to a source over a kilometer away in 1895, and the first transatlantic signal on December 12, 1901. The first commercial radio broadcast was transmitted on November 2, 1920 when the live returns of the Harding-Cox presidential election were broadcast by Westinghouse Electric and Manufacturing Company in Pittsburgh, under the call sign KDKA. The emission of radio waves is regulated by law, coordinated by the International Telecommunication Union (ITU), which allocates frequency bands in the radio spectrum for different uses.

Radio waves are radiated by electric charges undergoing acceleration. They are generated artificially by time varying electric currents, consisting of electrons flowing back and forth in a metal conductor called an antenna. As they travel farther from the transmitting antenna, radio waves spread out so their signal strength (intensity in watts per square meter) decreases, so radio transmissions can only be received within a limited range of the transmitter, the distance depending on the transmitter power, the antenna radiation pattern, receiver sensitivity, noise level, and presence of obstructions between transmitter and receiver. An omnidirectional antenna transmits or receives radio waves in all directions, while a directional antenna or high-gain antenna transmits radio waves in a beam in a particular direction, or receives waves from only one direction. Radio waves travel at the speed of light in a vacuum. The other types of electromagnetic waves besides radio waves, infrared, visible light, ultraviolet, X-rays and gamma rays, can also carry information and be used for communication. The wide use of radio waves for telecommunication is mainly due to their desirable propagation properties stemming from their large wavelength.

projected-15368428-021

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

Radio

History

Radio is the technology of signaling and communicating using radio waves. Radio waves are electromagnetic waves of frequency between 30 hertz (Hz) and 300 gigahertz (GHz). They are generated by an electronic device called a transmitter connected to an antenna which radiates the waves, and received by another antenna connected to a radio receiver. Radio is very widely used in modern technology, in radio communication, radar, radio navigation, remote control, remote sensing, and other applications. In radio communication, used in radio and television broadcasting, cell phones, two-way radios, wireless networking, and satellite communication, among numerous other uses, radio waves are used to carry information across space from a transmitter to a receiver, by modulating the radio signal (impressing an information signal on the radio wave by varying some aspect of the wave) in the transmitter. In radar, used to locate and track objects like aircraft, ships, spacecraft and missiles, a beam of radio waves emitted by a radar transmitter reflects off the target object, and the reflected waves reveal the object's location. In radio navigation systems such as GPS and VOR, a mobile receiver accepts radio signals from navigational radio beacons whose position is known, and by precisely measuring the arrival time of the radio waves the receiver can calculate its position on Earth. In wireless radio remote control devices like drones, garage door openers, and keyless entry systems, radio signals transmitted from a controller device control the actions of a remote device. Applications of radio waves that do not involve transmitting the waves significant distances, such as RF heating used in industrial processes and microwave ovens, and medical uses such as diathermy and MRI machines, are not usually called radio. The noun radio is also used to mean a broadcast radio receiver. The existence of radio waves was first proven by German physicist Heinrich Hertz on November 11, 1886. In the mid 1890s, building on techniques physicists were using to study electromagnetic waves, Guglielmo Marconi developed the first apparatus for long-distance radio communication, sending a wireless Morse Code message to a source over a kilometer away in 1895, and the first transatlantic signal on December 12, 1901. The first commercial radio broadcast was transmitted on November 2, 1920 when the live returns of the Harding-Cox presidential election were broadcast by Westinghouse Electric and Manufacturing Company in Pittsburgh, under the call sign KDKA. The emission of radio waves is regulated by law, coordinated by the International Telecommunication Union (ITU), which allocates frequency bands in the radio spectrum for different uses.

See History of radio, Invention of radio, Timeline of radio, History of broadcasting On November 11, 1886, propagation of an electromagnetic wave was first observed by German physicist Heinrich Hertz. Hertz's discovery was later applied by Guglielmo Marconi, Alexander Stepanovich Popov, and Ferdinand Braun to devices designed to transmit and receive radio waves. In 1895, Marconi developed the first apparatus for long-distance radio communication, demonstrated by sending a morse code signal at a distance of more than a kilometer. On December 12, 1901, Marconi sent the first transatlantic radio signal. On November 2, 1920, the first commercial radio broadcast was transmitted by Westinghouse Electric and Manufacturing Company in Pittsburgh, under the call sign KDKA featuring live coverage of the Harding-Cox presidential election.

projected-15440316-029

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

Wind

On other planets

Wind is the natural movement of air or other gases relative to a planet's surface. Winds occur on a range of scales, from thunderstorm flows lasting tens of minutes, to local breezes generated by heating of land surfaces and lasting a few hours, to global winds resulting from the difference in absorption of solar energy between the climate zones on Earth. The two main causes of large-scale atmospheric circulation are the differential heating between the equator and the poles, and the rotation of the planet (Coriolis effect). Within the tropics and subtropics, thermal low circulations over terrain and high plateaus can drive monsoon circulations. In coastal areas the sea breeze/land breeze cycle can define local winds; in areas that have variable terrain, mountain and valley breezes can prevail. Winds are commonly classified by their spatial scale, their speed and direction, the forces that cause them, the regions in which they occur, and their effect. Winds have various aspects: velocity (wind speed); the density of the gas involved; energy content, or wind energy. In meteorology, winds are often referred to according to their strength, and the direction from which the wind is blowing. The convention for directions refer to where the wind comes from; therefore, a 'western' or 'westerly' wind blows from the west to the east, a 'northern' wind blows south, and so on. This is sometimes counter-intuitive. Short bursts of high speed wind are termed gusts. Strong winds of intermediate duration (around one minute) are termed squalls. Long-duration winds have various names associated with their average strength, such as breeze, gale, storm, and hurricane. In outer space, solar wind is the movement of gases or charged particles from the Sun through space, while planetary wind is the outgassing of light chemical elements from a planet's atmosphere into space. The strongest observed winds on a planet in the Solar System occur on Neptune and Saturn. In human civilization, the concept of wind has been explored in mythology, influenced the events of history, expanded the range of transport and warfare, and provided a power source for mechanical work, electricity, and recreation. Wind powers the voyages of sailing ships across Earth's oceans. Hot air balloons use the wind to take short trips, and powered flight uses it to increase lift and reduce fuel consumption. Areas of wind shear caused by various weather phenomena can lead to dangerous situations for aircraft. When winds become strong, trees and human-made structures can be damaged or destroyed. Winds can shape landforms, via a variety of aeolian processes such as the formation of fertile soils, for example loess, and by erosion. Dust from large deserts can be moved great distances from its source region by the prevailing winds; winds that are accelerated by rough topography and associated with dust outbreaks have been assigned regional names in various parts of the world because of their significant effects on those regions. Wind also affects the spread of wildfires. Winds can disperse seeds from various plants, enabling the survival and dispersal of those plant species, as well as flying insect and bird populations. When combined with cold temperatures, the wind has a negative impact on livestock. Wind affects animals' food stores, as well as their hunting and defensive strategies.

Strong winds at Venus's cloud tops circle the planet every four to five earth days. When the poles of Mars are exposed to sunlight after their winter, the frozen CO2 sublimates, creating significant winds that sweep off the poles as fast as , which subsequently transports large amounts of dust and water vapor over its landscape. Other Martian winds have resulted in cleaning events and dust devils. On Jupiter, wind speeds of are common in zonal jet streams. Saturn's winds are among the Solar System's fastest. Cassini–Huygens data indicated peak easterly winds of . On Uranus, northern hemisphere wind speeds reach as high as near 50 degrees north latitude. At the cloud tops of Neptune, prevailing winds range in speed from along the equator to at the poles. At 70° S latitude on Neptune, a high-speed jet stream travels at a speed of . The fastest wind on any known planet is on HD 80606 b located 190 light years away, where it blows at more than 11,000 mph or 5 km/s.

projected-04655918-003

https://en.wikipedia.org/wiki/Traditional%20African%20religions

Traditional African religions

Ceremonies

The traditional beliefs and practices of African people are highly diverse beliefs that include various ethnic religions. Generally, these traditions are oral rather than scriptural and passed down from one generation to another through folk tales, songs, and festivals, include belief in an amount of higher and lower gods, sometimes including a supreme creator or force, belief in spirits, veneration of the dead, use of magic and traditional African medicine. Most religions can be described as animistic with various polytheistic and pantheistic aspects. The role of humanity is generally seen as one of harmonizing nature with the supernatural.

West and Central African religious practices generally manifest themselves in communal ceremonies or divinatory rites in which members of the community, overcome by force (or ashe, nyama, etc.), are excited to the point of going into meditative trance in response to rhythmic or driving drumming or singing. One religious ceremony practiced in Gabon and Cameroon is the Okuyi, practiced by several Bantu ethnic groups. In this state, depending upon the region, drumming or instrumental rhythms played by respected musicians (each of which is unique to a given deity or ancestor), participants embody a deity or ancestor, energy or state of mind by performing distinct ritual movements or dances which further enhance their elevated consciousness. When this trance-like state is witnessed and understood, adherents are privy to a way of contemplating the pure or symbolic embodiment of a particular mindset or frame of reference. This builds skills at separating the feelings elicited by this mindset from their situational manifestations in daily life. Such separation and subsequent contemplation of the nature and sources of pure energy or feelings serves to help participants manage and accept them when they arise in mundane contexts. This facilitates better control and transformation of these energies into positive, culturally appropriate behavior, thought, and speech. Also, this practice can give rise to those in these trances uttering words which, when interpreted by a culturally educated initiate or diviner, can provide insight into appropriate directions which the community (or individual) might take in accomplishing its goal.

projected-04655918-004

https://en.wikipedia.org/wiki/Traditional%20African%20religions

Traditional African religions

Spirits

The traditional beliefs and practices of African people are highly diverse beliefs that include various ethnic religions. Generally, these traditions are oral rather than scriptural and passed down from one generation to another through folk tales, songs, and festivals, include belief in an amount of higher and lower gods, sometimes including a supreme creator or force, belief in spirits, veneration of the dead, use of magic and traditional African medicine. Most religions can be described as animistic with various polytheistic and pantheistic aspects. The role of humanity is generally seen as one of harmonizing nature with the supernatural.

Followers of traditional African religions pray to various spirits as well as to their ancestors. This includes also nature, elementary and animal spirits. The difference between powerful spirits and gods is often minimal. Most African societies believe in several “high gods” and a large amount of lower gods and spirits. There are also some religions with a single supreme being (Chukwu, Nyame, Olodumare, Ngai, Roog, etc.). Some recognize a dual god and goddess such as Mawu-Lisa. Traditional African religions generally believe in an afterlife, one or more Spirit worlds, and Ancestor worship is an important basic concept in mostly all African religions. Some African religions adopted different views through the influence of Islam or even Hinduism.

projected-00126630-002

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

Malay language

History

Malay (; , Jawi: , Rencong: ) is an Austronesian language that is an official language of Brunei, Indonesia, Malaysia, and Singapore, and that is also spoken in East Timor and parts of the Philippines and Thailand. Altogether, it is spoken by 290 million people (around 260 million in Indonesia alone in its own literary standard named "Indonesian") across Maritime Southeast Asia. As the or ("national language") of several states, Standard Malay has various official names. In Malaysia, it is designated as either ("Malaysian Malay") or also ("Malay language"). In Singapore and Brunei, it is called ("Malay language"). In Indonesia, an autonomous normative variety called ("Indonesian language") is designated the ("unifying language" or lingua franca). However, in areas of Central to Southern Sumatra, where vernacular varieties of Malay are indigenous, Indonesians refer to the language as , and consider it to be one of their regional languages. Malay, also called Court Malay, was the literary standard of the pre-colonial Malacca and Johor Sultanates and so the language is sometimes called Malacca, Johor or Riau Malay (or various combinations of those names) to distinguish it from the various other Malayic languages. According to Ethnologue 16, several of the Malayic varieties they currently list as separate languages, including the varieties of Peninsular Malay, are so closely related to standard Malay that they may prove to be dialects. There are also several Malay trade and creole languages based on a lingua franca derived from Classical Malay as well as Macassar Malay, which appears to be a mixed language.

The history of the Malay language can be divided into five periods: Old Malay, the Transitional Period, the Classical Malay, Late Modern Malay and Modern Malay. Old Malay is believed to be the actual ancestor of Classical Malay. Old Malay was influenced by Sanskrit, the literary language of Classical India and a liturgical language of Hinduism and Buddhism. Sanskrit loanwords can be found in Old Malay vocabulary. The earliest known stone inscription in the Old Malay language was found in Sumatra, Indonesia, written in the Pallava variety of the Grantha alphabet and is dated 1 May 683. Known as the Kedukan Bukit inscription, it was discovered by the Dutchman M. Batenburg on 29 November 1920 at Kedukan Bukit, South Sumatra, on the banks of the Tatang, a tributary of the Musi River. It is a small stone of . Other evidence is the Tanjung Tanah Law in post-Pallava letters. This 14th-century pre-Islamic legal text was produced in the Adityawarman era (1345–1377) of Dharmasraya, a Hindu-Buddhist kingdom that arose after the end of Srivijayan rule in Sumatra. The laws were for the Minangkabau people, who today still live in the highlands of Sumatra, Indonesia. Terengganu Inscription Stone (Malay: Batu Bersurat Terengganu; Jawi: باتو برسورت ترڠݢانو) is a granite stele carrying inscription in Jawi script that was found in Terengganu, Malaysia is the earliest evidence of classical Malay inscription. The inscription, dated possibly to 702 AH (corresponds to 1303 CE), constituted the earliest evidence of Jawi writing in the Malay world of Southeast Asia, and was one of the oldest testimonies to the advent of Islam as a state religion in the region. It contains the proclamation issued by a ruler of Terengganu known as Seri Paduka Tuan, urging his subjects to extend and uphold Islam and providing 10 basic Sharia laws for their guidance. The Malay language came into widespread use as the lingua franca of the Malacca Sultanate (1402–1511). During this period, the Malay language developed rapidly under the influence of Islamic literature. The development changed the nature of the language with massive infusion of Arabic, Tamil and Sanskrit vocabularies, called Classical Malay. Under the Sultanate of Malacca the language evolved into a form recognisable to speakers of modern Malay. When the court moved to establish the Johor Sultanate, it continued using the classical language; it has become so associated with Dutch Riau and British Johor that it is often assumed that the Malay of Riau is close to the classical language. However, there is no closer connection between Malaccan Malay as used on Riau and the Riau vernacular. Among the oldest surviving letters written in Malay are the letters from Sultan Abu Hayat of Ternate, Maluku Islands in present-day Indonesia, dated around 1521–1522. The text is addressed to the king of Portugal, following contact with Portuguese explorer Francisco Serrão. The letters show sign of non-native usage; the Ternateans used (and still use) the unrelated Ternate language, a West Papuan language, as their first language. Malay was used solely as a lingua franca for inter-ethnic communications.

projected-00036858-003

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

Wheat

Physiology

Wheat is a grass widely cultivated for its seed, a cereal grain that is a worldwide staple food. The many species of wheat together make up the genus Triticum; the most widely grown is common wheat (T. aestivum). The archaeological record suggests that wheat was first cultivated in the regions of the Fertile Crescent around 9600 BCE. Botanically, the wheat kernel is a type of fruit called a caryopsis. Wheat is grown on more land area than any other food crop (, 2014). World trade in wheat is greater than for all other crops combined. In 2020, world production of wheat was , making it the second most-produced cereal after maize. Since 1960, world production of wheat and other grain crops has tripled and is expected to grow further through the middle of the 21st century. Global demand for wheat is increasing due to the unique viscoelastic and adhesive properties of gluten proteins, which facilitate the production of processed foods, whose consumption is increasing as a result of the worldwide industrialization process and the westernization of the diet. Wheat is an important source of carbohydrates. Globally, it is the leading source of vegetable proteins in human food, having a protein content of about 13%, which is relatively high compared to other major cereals but relatively low in protein quality for supplying essential amino acids. When eaten as the whole grain, wheat is a source of multiple nutrients and dietary fiber. In a small part of the general population, glutenthe major part of wheat proteincan trigger coeliac disease, noncoeliac gluten sensitivity, gluten ataxia, and dermatitis herpetiformis.

Leaves emerge from the shoot apical meristem in a telescoping fashion until the transition to reproduction i.e. flowering. The last leaf produced by a wheat plant is known as the flag leaf. It is denser and has a higher photosynthetic rate than other leaves, to supply carbohydrate to the developing ear. In temperate countries the flag leaf, along with the second and third highest leaf on the plant, supply the majority of carbohydrate in the grain and their condition is paramount to yield formation. Wheat is unusual among plants in having more stomata on the upper (adaxial) side of the leaf, than on the under (abaxial) side. It has been theorised that this might be an effect of it having been domesticated and cultivated longer than any other plant. Winter wheat generally produces up to 15 leaves per shoot and spring wheat up to 9 and winter crops may have up to 35 tillers (shoots) per plant (depending on cultivar). Wheat roots are among the deepest of arable crops, extending as far down as . While the roots of a wheat plant are growing, the plant also accumulates an energy store in its stem, in the form of fructans, which helps the plant to yield under drought and disease pressure, but it has been observed that there is a trade-off between root growth and stem non-structural carbohydrate reserves. Root growth is likely to be prioritised in drought-adapted crops, while stem non-structural carbohydrate is prioritised in varieties developed for countries where disease is a bigger issue. Depending on variety, wheat may be awned or not awned. Producing awns incurs a cost in grain number, but wheat awns photosynthesise more efficiently than their leaves with regards to water usage, so awns are much more frequent in varieties of wheat grown in hot drought-prone countries than those generally seen in temperate countries. For this reason, awned varieties could become more widely grown due to climate change. In Europe, however, a decline in climate resilience of wheat has been observed.

projected-00239038-001

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

Construction

History

Construction is a general term meaning the art and science to form objects, systems, or organizations, and comes from Latin constructio (from com- "together" and struere "to pile up") and Old French construction. To construct is the verb: the act of building, and the noun is construction: how something is built, the nature of its structure. In its most widely used context, construction covers the processes involved in delivering buildings, infrastructure, industrial facilities and associated activities through to the end of their life. It typically starts with planning, financing, and design, and continues until the asset is built and ready for use; construction also covers repairs and maintenance work, any works to expand, extend and improve the asset, and its eventual demolition, dismantling or decommissioning. The construction industry contributes significantly to many countries’ gross domestic products (GDP). Global expenditure on construction activities was about $4 trillion in 2012. Today, expenditure on the construction industry exceeds $11 trillion a year, equivalent to about 13 percent of global GDP. This spending was forecast to rise to around $14.8 trillion in 2030. Although the construction industry promotes economic development and brings many non-monetary benefits to many countries, it is one of the most hazardous industries. For example, about 20% (1,061) of US industry fatalities in 2019 happened in construction.

The first huts and shelters were constructed by hand or with simple tools. As cities grew during the Bronze Age, a class of professional craftsmen, like bricklayers and carpenters, appeared. Occasionally, slaves were used for construction work. In the Middle Ages, the artisan craftsmen were organized into guilds. In the 19th century, steam-powered machinery appeared, and, later, diesel- and electric-powered vehicles such as cranes, excavators and bulldozers. Fast-track construction has been increasingly popular in the 21st century. Some estimates suggest that 40% of construction projects are now fast-track construction.

projected-00037401-004

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

Fertilizer

Classification

A fertilizer (American English) or fertiliser (British English; see spelling differences) is any material of natural or synthetic origin that is applied to soil or to plant tissues to supply plant nutrients. Fertilizers may be distinct from liming materials or other non-nutrient soil amendments. Many sources of fertilizer exist, both natural and industrially produced. For most modern agricultural practices, fertilization focuses on three main macro nutrients: nitrogen (N), phosphorus (P), and potassium (K) with occasional addition of supplements like rock dust for micronutrients. Farmers apply these fertilizers in a variety of ways: through dry or pelletized or liquid application processes, using large agricultural equipment or hand-tool methods. Historically fertilization came from natural or organic sources: compost, animal manure, human manure, harvested minerals, crop rotations and byproducts of human-nature industries (i.e. fish processing waste, or bloodmeal from animal slaughter). However, starting in the 19th century, after innovations in plant nutrition, an agricultural industry developed around synthetically created fertilizers. This transition was important in transforming the global food system, allowing for larger-scale industrial agriculture with large crop yields. Nitrogen-fixing chemical processes such as the Haber process at the beginning of the 20th century, amplified by production capacity created during World War II led to a boom in using nitrogen fertilizers. In the latter half of the 20th century, increased the use of nitrogen fertilizers (800% increase between 1961 and 2019) have been a crucial component of the increased productivity of conventional food systems (more than 30% per capita) as part of the so-called "Green Revolution". The use of artificial and industrially-applied fertilizers has led to a number of environmental impacts, creating water pollution and Eutrophication caused by nutritional runoff, carbon and other emissions from fertilizer production and mining, and contamination and pollution of soil. Various types of sustainable agriculture practices can be implemented to reduce the environmental impact of fertilizer uses alongside other environmental impacts of agriculture.

Fertilizers are classified in several ways. They are classified according to whether they provide a single nutrient (e.g., K, P, or N), in which case they are classified as "straight fertilizers." "multinutrient fertilizers" (or "complex fertilizers") provide two or more nutrients, for example N and P. Fertilizers are also sometimes classified as inorganic (the topic of most of this article) versus organic. Inorganic fertilizers exclude carbon-containing materials except ureas. Organic fertilizers are usually (recycled) plant- or animal-derived matter. Inorganic are sometimes called synthetic fertilizers since various chemical treatments are required for their manufacture.

projected-00037585-001

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

Museum

Etymology

A museum ( ; plural museums or, rarely, musea) is a building or institution that cares for and displays a collection of artifacts and other objects of artistic, cultural, historical, or scientific importance. Many public museums make these items available for public viewing through exhibits that may be permanent or temporary. The largest museums are located in major cities throughout the world, while thousands of local museums exist in smaller cities, towns, and rural areas. Museums have varying aims, ranging from the conservation and documentation of their collection, serving researchers and specialists, to catering to the general public. The goal of serving researchers is not only scientific, but intended to serve the general public. There are many types of museums, including art museums, natural history museums, science museums, war museums, and children's museums. According to the International Council of Museums (ICOM), there are more than 55,000 museums in 202 countries.

The English "museum" comes from the Latin word, and is pluralized as "museums" (or rarely, "musea"). It is originally from the Ancient Greek Μουσεῖον (Mouseion), which denotes a place or temple dedicated to the muses (the patron divinities in Greek mythology of the arts), and hence was a building set apart for study and the arts, especially the Musaeum (institute) for philosophy and research at Alexandria, built under Ptolemy I Soter about 280 BC.

wit-train-topic-002956321

projected-00037966-014

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

Himalayas

Resources

The Himalayas, or Himalaya (; ; ), is a mountain range in Asia, separating the plains of the Indian subcontinent from the Tibetan Plateau. The range has some of the planet's highest peaks, including the very highest, Mount Everest. Over 100 peaks exceeding in elevation lie in the Himalayas. By contrast, the highest peak outside Asia (Aconcagua, in the Andes) is tall. The Himalayas abut or cross five countries: Bhutan, India, Nepal, China, and Pakistan. The sovereignty of the range in the Kashmir region is disputed among India, Pakistan, and China. The Himalayan range is bordered on the northwest by the Karakoram and Hindu Kush ranges, on the north by the Tibetan Plateau, and on the south by the Indo-Gangetic Plain. Some of the world's major rivers, the Indus, the Ganges, and the Tsangpo–Brahmaputra, rise in the vicinity of the Himalayas, and their combined drainage basin is home to some 600 million people; 53 million people live in the Himalayas. The Himalayas have profoundly shaped the cultures of South Asia and Tibet. Many Himalayan peaks are sacred in Hinduism and Buddhism; the summits of several—Kangchenjunga (from the Indian side), Gangkhar Puensum, Machapuchare, Nanda Devi and Kailas in the Tibetan Transhimalaya—are off-limits to climbers. Lifted by the subduction of the Indian tectonic plate under the Eurasian Plate, the Himalayan mountain range runs west-northwest to east-southeast in an arc long. Its western anchor, Nanga Parbat, lies just south of the northernmost bend of the Indus river. Its eastern anchor, Namcha Barwa, lies immediately west of the great bend of the Yarlung Tsangpo River. The range varies in width from in the west to in the east.

The Himalayas are home to a diversity of medicinal resources. Plants from the forests have been used for millennia to treat conditions ranging from simple coughs to snake bites. Different parts of the plants – root, flower, stem, leaves, and bark – are used as remedies for different ailments. For example, a bark extract from an Abies pindrow tree is used to treat coughs and bronchitis. Leaf and stem paste from an Andrachne cordifolia is used for wounds and as an antidote for snake bites. The bark of a Callicarpa arborea is used for skin ailments. Nearly a fifth of the gymnosperms, angiosperms and pteridophytes in the Himalayas are found to have medicinal properties, and more are likely to be discovered. Most of the population in some Asian and African countries depends on medicinal plants rather than prescriptions and such. Since so many people use medicinal plants as their only source of healing in the Himalayas, the plants are an important source of income. This contributes to economic and modern industrial development both inside and outside the region. The only problem is that locals are rapidly clearing the forests on the Himalayas for wood, often illegally.

projected-00038407-001

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

Humour

Theories

Humour (Commonwealth English) or humor (American English) is the tendency of experiences to provoke laughter and provide amusement. The term derives from the humoral medicine of the ancient Greeks, which taught that the balance of fluids in the human body, known as humours (Latin: , "body fluid"), controlled human health and emotion. People of all ages and cultures respond to humour. Most people are able to experience humour—be amused, smile or laugh at something funny (such as a pun or joke)—and thus are considered to have a sense of humour. The hypothetical person lacking a sense of humour would likely find the behaviour inducing it to be inexplicable, strange, or even irrational. Though ultimately decided by personal taste, the extent to which a person finds something humorous depends on a host of variables, including geographical location, culture, maturity, level of education, intelligence and context. For example, young children may favour slapstick such as Punch and Judy puppet shows or the Tom and Jerry cartoons, whose physical nature makes it accessible to them. By contrast, more sophisticated forms of humour such as satire require an understanding of its social meaning and context, and thus tend to appeal to a more mature audience.

Many theories exist about what humour is and what social function it serves. The prevailing types of theories attempting to account for the existence of humour include psychological theories, the vast majority of which consider humour-induced behaviour to be very healthy; spiritual theories, which may, for instance, consider humour to be a "gift from God"; and theories which consider humour to be an unexplainable mystery, very much like a mystical experience. The benign-violation theory, endorsed by Peter McGraw, attempts to explain humour's existence. The theory says 'humour only occurs when something seems wrong, unsettling, or threatening, but simultaneously seems okay, acceptable or safe'. Humour can be used as a method to easily engage in social interaction by taking away that awkward, uncomfortable, or uneasy feeling of social interactions. Others believe that 'the appropriate use of humour can facilitate social interactions'.

projected-00039206-002

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

Business

Classifications

Business is the practice of making one's living or making money by producing or buying and selling products (such as goods and services). It is also "any activity or enterprise entered into for profit." Having a business name does not separate the business entity from the owner, which means that the owner of the business is responsible and liable for debts incurred by the business. If the business acquires debts, the creditors can go after the owner's personal possessions. A business structure does not allow for corporate tax rates. The proprietor is personally taxed on all income from the business. The term is also often used colloquially (but not by lawyers or by public officials) to refer to a company, such as a corporation or cooperative. Corporations, in contrast with sole proprietors and partnerships, are a separate legal entity and provide limited liability for their owners/members, as well as being subject to corporate tax rates. A corporation is more complicated and expensive to set up, but offers more protection and benefits for the owners/members.

Agriculture, such as the domestication of fish, animals, and livestock, as well as lumber, oil, vegetables, fruits, etc. Mining businesses that extract natural resources and raw materials, such as wood, petroleum, natural gas, ores, metals or minerals. Service businesses offer intangible goods or services and typically charge for labor or other services provided to government, to consumers, or to other businesses. Interior decorators, beauticians, hair stylists, make-up artists, tanning salons, laundromats, dry cleaners, and pest controllers are service businesses. Financial services businesses include banks, brokerage firms, credit unions, credit cards, insurance companies, asset and investment companies such as private-equity firms, private-equity funds, real estate investment trusts, sovereign wealth funds, pension funds, mutual funds, index funds, hedge funds, stock exchanges, and other companies that generate profits through investment and management of capital. Transportation businesses such as railways, airlines, and shipping companies deliver goods and individuals to their destinations for a fee. Utilities produce public services such as water, electricity, waste management or sewage treatment. These industries are usually operated under the charge of a public government. Entertainment companies and mass media agencies generate profits primarily from the sale of intellectual property. They include film studios and production houses, mass media companies such as cable television networks, online digital media agencies, talent agencies, mobile media outlets, newspapers, book and magazine publishing houses. Sports organizations are involved in producing, facilitating, promoting, or organizing any activity, experience, or business enterprise focused on sports. They make their profits by selling goods and services that are sports related. Industrial manufacturers produce products, either from raw materials or from component parts, then export the finished products at a profit. They include tangible goods such as cars, buses, medical devices, glass, or aircraft. Real estate businesses sell, invest, construct and develop properties, including land, residential homes, and other buildings. Retailers, wholesalers, and distributors act as middlemen and get goods produced by manufacturers to the intended consumers; they make their profits by marking up their prices. Most stores and catalog companies are distributors or retailers.

projected-41228673-001

https://en.wikipedia.org/wiki/Internal%20combustion%20engine

Internal combustion engine

History

An internal combustion engine (ICE or IC engine) is a heat engine in which the combustion of a fuel occurs with an oxidizer (usually air) in a combustion chamber that is an integral part of the working fluid flow circuit. In an internal combustion engine, the expansion of the high-temperature and high-pressure gases produced by combustion applies direct force to some component of the engine. The force is typically applied to pistons (piston engine), turbine blades (gas turbine), a rotor (Wankel engine), or a nozzle (jet engine). This force moves the component over a distance, transforming chemical energy into kinetic energy which is used to propel, move or power whatever the engine is attached to. This replaced the external combustion engine for applications where the weight or size of an engine was more important. The first commercially successful internal combustion engine was created by Étienne Lenoir around 1860, and the first modern internal combustion engine, known as the Otto engine, was created in 1876 by Nicolaus Otto. The term internal combustion engine usually refers to an engine in which combustion is intermittent, such as the more familiar two-stroke and four-stroke piston engines, along with variants, such as the six-stroke piston engine and the Wankel rotary engine. A second class of internal combustion engines use continuous combustion: gas turbines, jet engines and most rocket engines, each of which are internal combustion engines on the same principle as previously described. Firearms are also a form of internal combustion engine, though of a type so specialized that they are commonly treated as a separate category, along with weaponry such as mortars and anti-aircraft cannons. In contrast, in external combustion engines, such as steam or Stirling engines, energy is delivered to a working fluid not consisting of, mixed with, or contaminated by combustion products. Working fluids for external combustion engines include air, hot water, pressurized water or even boiler-heated liquid sodium. While there are many stationary applications, most ICEs are used in mobile applications and are the primary power supply for vehicles such as cars, aircraft and boats. ICEs are typically powered by hydrocarbon-based fuels like natural gas, gasoline, diesel fuel, or ethanol. Renewable fuels like biodiesel are used in compression ignition (CI) engines and bioethanol or ETBE (ethyl tert-butyl ether) produced from bioethanol in spark ignition (SI) engines. As early as 1900 the inventor of the diesel engine, Rudolf Diesel, was using peanut oil to run his engines. Renewable fuels are commonly blended with fossil fuels. Hydrogen, which is rarely used, can be obtained from either fossil fuels or renewable energy.

Various scientists and engineers contributed to the development of internal combustion engines. In 1791, John Barber developed the gas turbine. In 1794 Thomas Mead patented a gas engine. Also in 1794, Robert Street patented an internal combustion engine, which was also the first to use liquid fuel, and built an engine around that time. In 1798, John Stevens built the first American internal combustion engine. In 1807, French engineers Nicéphore Niépce (who went on to invent photography) and Claude Niépce ran a prototype internal combustion engine, using controlled dust explosions, the Pyréolophore, which was granted a patent by Napoleon Bonaparte. This engine powered a boat on the Saône river in France. In the same year, Swiss engineer François Isaac de Rivaz invented a hydrogen-based internal combustion engine and powered the engine by electric spark. In 1808, De Rivaz fitted his invention to a primitive working vehicle – "the world's first internal combustion powered automobile". In 1823, Samuel Brown patented the first internal combustion engine to be applied industrially. In 1854 in the UK, the Italian inventors Eugenio Barsanti and Felice Matteucci obtained the certification: "Obtaining Motive Power by the Explosion of Gases". In 1857 the Great Seal Patent Office conceded them patent No.1655 for the invention of an "Improved Apparatus for Obtaining Motive Power from Gases". Barsanti and Matteucci obtained other patents for the same invention in France, Belgium and Piedmont between 1857 and 1859. In 1860, Belgian engineer Jean Joseph Etienne Lenoir produced a gas-fired internal combustion engine. In 1864, Nicolaus Otto patented the first atmospheric gas engine. In 1872, American George Brayton invented the first commercial liquid-fueled internal combustion engine. In 1876, Nicolaus Otto began working with Gottlieb Daimler and Wilhelm Maybach, patented the compressed charge, four-cycle engine. In 1879, Karl Benz patented a reliable two-stroke gasoline engine. Later, in 1886, Benz began the first commercial production of motor vehicles with an internal combustion engine, in which a three-wheeled, four-cycle engine and chassis formed a single unit. In 1892, Rudolf Diesel developed the first compressed charge, compression ignition engine. In 1926, Robert Goddard launched the first liquid-fueled rocket. In 1939, the Heinkel He 178 became the world's first jet aircraft.

projected-41228673-004

https://en.wikipedia.org/wiki/Internal%20combustion%20engine

Internal combustion engine

Classification

An internal combustion engine (ICE or IC engine) is a heat engine in which the combustion of a fuel occurs with an oxidizer (usually air) in a combustion chamber that is an integral part of the working fluid flow circuit. In an internal combustion engine, the expansion of the high-temperature and high-pressure gases produced by combustion applies direct force to some component of the engine. The force is typically applied to pistons (piston engine), turbine blades (gas turbine), a rotor (Wankel engine), or a nozzle (jet engine). This force moves the component over a distance, transforming chemical energy into kinetic energy which is used to propel, move or power whatever the engine is attached to. This replaced the external combustion engine for applications where the weight or size of an engine was more important. The first commercially successful internal combustion engine was created by Étienne Lenoir around 1860, and the first modern internal combustion engine, known as the Otto engine, was created in 1876 by Nicolaus Otto. The term internal combustion engine usually refers to an engine in which combustion is intermittent, such as the more familiar two-stroke and four-stroke piston engines, along with variants, such as the six-stroke piston engine and the Wankel rotary engine. A second class of internal combustion engines use continuous combustion: gas turbines, jet engines and most rocket engines, each of which are internal combustion engines on the same principle as previously described. Firearms are also a form of internal combustion engine, though of a type so specialized that they are commonly treated as a separate category, along with weaponry such as mortars and anti-aircraft cannons. In contrast, in external combustion engines, such as steam or Stirling engines, energy is delivered to a working fluid not consisting of, mixed with, or contaminated by combustion products. Working fluids for external combustion engines include air, hot water, pressurized water or even boiler-heated liquid sodium. While there are many stationary applications, most ICEs are used in mobile applications and are the primary power supply for vehicles such as cars, aircraft and boats. ICEs are typically powered by hydrocarbon-based fuels like natural gas, gasoline, diesel fuel, or ethanol. Renewable fuels like biodiesel are used in compression ignition (CI) engines and bioethanol or ETBE (ethyl tert-butyl ether) produced from bioethanol in spark ignition (SI) engines. As early as 1900 the inventor of the diesel engine, Rudolf Diesel, was using peanut oil to run his engines. Renewable fuels are commonly blended with fossil fuels. Hydrogen, which is rarely used, can be obtained from either fossil fuels or renewable energy.

There are several possible ways to classify internal combustion engines.

projected-00142586-010

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

Domestication

History

Domestication is a sustained multi-generational relationship in which humans assume a significant degree of control over the reproduction and care of another group of organisms to secure a more predictable supply of resources from that group. A broader biological definition is that it is a coevolutionary process that arises from a mutualism, in which one species (the domesticator) constructs an environment where it actively manages both the survival and reproduction of another species (the domesticate) in order to provide the former with resources and/or services. The domestication of plants and animals by humans was a major cultural innovation ranked in importance with the conquest of fire, the manufacturing of tools, and the development of verbal language. Charles Darwin recognized the small number of traits that made domestic species different from their wild ancestors. He was also the first to recognize the difference between conscious selective breeding (i.e. artificial selection) in which humans directly select for desirable traits, and unconscious selection where traits evolve as a by-product of natural selection or from selection on other traits. There is a genetic difference between domestic and wild populations. There is also such a difference between the domestication traits that researchers believe to have been essential at the early stages of domestication, and the improvement traits that have appeared since the split between wild and domestic populations. Domestication traits are generally fixed within all domesticates, and were selected during the initial episode of domestication of that animal or plant, whereas improvement traits are present only in a proportion of domesticates, though they may be fixed in individual breeds or regional populations. The dog was the first domesticated species, and was established across Eurasia before the end of the Late Pleistocene era, well before cultivation and before the domestication of other animals. The archaeological and genetic data suggest that long-term bidirectional gene flow between wild and domestic stocks – including donkeys, horses, New and Old World camelids, goats, sheep, and pigs – was common. Given its importance to humans and its value as a model of evolutionary and demographic change, domestication has attracted scientists from archaeology, paleontology, anthropology, botany, zoology, genetics, and the environmental sciences. Among birds, the major domestic species today is the chicken, important for meat and eggs, though economically valuable poultry include the turkey, guineafowl and numerous other species. Birds are also widely kept as cagebirds, from songbirds to parrots. The longest established invertebrate domesticates are the honey bee and the silkworm. Land snails are raised for food, while species from several phyla are kept for research, and others are bred for biological control. The domestication of plants began at least 12,000 years ago with cereals in the Middle East, and the bottle gourd in Asia. Agriculture developed in at least 11 different centres around the world, domesticating different crops and animals.

The earliest human attempts at plant domestication occurred in the Middle East. There is early evidence for conscious cultivation and trait selection of plants by pre-Neolithic groups in Syria: grains of rye with domestic traits dated 13,000 years ago have been recovered from Abu Hureyra in Syria, but this appears to be a localised phenomenon resulting from cultivation of stands of wild rye, rather than a definitive step towards domestication. The bottle gourd (Lagenaria siceraria) plant, used as a container before the advent of ceramic technology, appears to have been domesticated 10,000 years ago. The domesticated bottle gourd reached the Americas from Asia by 8,000 years ago, most likely due to the migration of peoples from Asia to America. Cereal crops were first domesticated around 11,000 years ago in the Fertile Crescent in the Middle East. The first domesticated crops were generally annuals with large seeds or fruits. These included pulses such as peas and grains such as wheat. The Middle East was especially suited to these species; the dry-summer climate was conducive to the evolution of large-seeded annual plants, and the variety of elevations led to a great variety of species. As domestication took place humans began to move from a hunter-gatherer society to a settled agricultural society. This change would eventually lead, some 4000 to 5000 years later, to the first city states and eventually the rise of civilization itself. Continued domestication was gradual, a process of intermittent trial and error, and often resulted in diverging traits and characteristics. Over time perennials and small trees including the apple and the olive were domesticated. Some plants, such as the macadamia nut and the pecan, were not domesticated until recently. In other parts of the world very different species were domesticated. In the Americas squash, maize, beans, and perhaps manioc (also known as cassava) formed the core of the diet. In East Asia millet, rice, and soy were the most important crops. Some areas of the world such as Southern Africa, Australia, California and southern South America never saw local species domesticated.

wit-train-topic-002380005

projected-00286469-001

https://en.wikipedia.org/wiki/Scramble%20for%20Africa

Scramble for Africa

Background

The Scramble for Africa, also called the Partition of Africa, or Conquest of Africa, was the invasion, annexation, division, and colonization of most of Africa by seven Western European powers during a short period known as New Imperialism (between 1881 and 1914). The 10 percent of Africa that was under formal European control in 1870 increased to almost 90 percent by 1914, with only Liberia and Abyssinia remaining independent. The Berlin Conference of 1884, which regulated European colonization and trade in Africa, is usually accepted as the beginning. In the last quarter of the 19th century, there were considerable political rivalries within the empires of the European continent, leading to the African continent being partitioned without wars between European nations. The later years of the 19th century saw a transition from "informal imperialism" – military influence and economic dominance – to direct rule.

By 1841, businessmen from Europe had established small trading posts along the coasts of Africa, but they seldom moved inland, preferring to stay near the sea. They primarily traded with locals. Large parts of the continent were essentially uninhabitable for Europeans because of their high mortality rates from tropical diseases such as malaria. In the middle of the 19th century, European explorers mapped much of East Africa and Central Africa. As late as the 1870s, Europeans controlled approximately 10% of the African continent, with all their territories located near the coasts. The most important holdings were Angola and Mozambique, held by Portugal; the Cape Colony, held by Great Britain; and Algeria, held by France. By 1914, only Ethiopia and Liberia remained independent of European control, with the latter having strong connections to the United States. Technological advances facilitated European expansion overseas. Industrialization brought about rapid advancements in transportation and communication, especially in the forms of steamships, railways and telegraphs. Medical advances also played an important role, especially medicines for tropical diseases, which helped control their adverse effects. The development of quinine, an effective treatment for malaria, made vast expanses of the tropics more accessible for Europeans.

wit-train-topic-004355208

projected-18948043-012

https://en.wikipedia.org/wiki/Alcoholic%20beverage

Alcoholic beverage

Distilled beverages

An alcoholic beverage (also called an alcoholic drink, adult beverage, or simply a drink) is a drink that contains ethanol, a type of alcohol that acts as a drug and is produced by fermentation of grains, fruits, or other sources of sugar. The consumption of alcoholic drinks, often referred to as "drinking", plays an important social role in many cultures. Most countries have laws regulating the production, sale, and consumption of alcoholic beverages. Regulations may require the labeling of the percentage alcohol content (as ABV or proof) and the use of a warning label. Some countries ban such activities entirely, but alcoholic drinks are legal in most parts of the world. The global alcoholic drink industry exceeded $1 trillion in 2018. Alcohol is a depressant, which in low doses causes euphoria, reduces anxiety, and increases sociability. In higher doses, it causes drunkenness, stupor, unconsciousness, or death. Long-term use can lead to an alcohol use disorder, an increased risk of developing several types of cancer, cardiovascular disease, and physical dependence. Alcohol is one of the most widely used recreational drugs in the world, and about 33% of all humans currently drink alcohol. In 2015, among Americans, 86% of adults had consumed alcohol at some point, with 70% drinking it in the last year and 56% in the last month. Alcoholic drinks are typically divided into three classes—beers, wines, and spirits—and typically their alcohol content is between 3% and 50%. Discovery of late Stone Age jugs suggest that intentionally fermented drinks existed at least as early as the Neolithic period (). Several other animals are affected by alcohol similarly to humans and, once they consume it, will consume it again if given the opportunity, though humans are the only species known to produce alcoholic drinks intentionally.

Distilled beverages (also called liquors or spirit drinks) are alcoholic drinks produced by distilling (i.e., concentrating by distillation) ethanol produced by means of fermenting grain, fruit, or vegetables. Unsweetened, distilled, alcoholic drinks that have an alcohol content of at least 20% ABV are called spirits. For the most common distilled drinks, such as whiskey and vodka, the alcohol content is around 40%. The term hard liquor is used in North America to distinguish distilled drinks from undistilled ones (implicitly weaker). Vodka, gin, baijiu, shōchū, soju, tequila, whiskey, brandy and rum are examples of distilled drinks. Distilling concentrates the alcohol and eliminates some of the congeners. Freeze distillation concentrates ethanol along with methanol and fusel alcohols (fermentation by-products partially removed by distillation) in applejack. Fortified wine is wine, such as port or sherry, to which a distilled beverage (usually brandy) has been added. Fortified wine is distinguished from spirits made from wine in that spirits are produced by means of distillation, while fortified wine is simply wine that has had a spirit added to it. Many different styles of fortified wine have been developed, including port, sherry, madeira, marsala, commandaria, and the aromatized wine vermouth.

wit-train-topic-000159867

projected-18951556-014

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

Arctic Ocean

Geology

The Arctic Ocean is the smallest and shallowest of the world's five major oceans. It spans an area of approximately and is known as the coldest of all the oceans. The International Hydrographic Organization (IHO) recognizes it as an ocean, although some oceanographers call it the Arctic Mediterranean Sea. It has been described approximately as an estuary of the Atlantic Ocean. It is also seen as the northernmost part of the all-encompassing World Ocean. The Arctic Ocean includes the North Pole region in the middle of the Northern Hemisphere and extends south to about 60°N. The Arctic Ocean is surrounded by Eurasia and North America, and the borders follow topographic features: the Bering Strait on the Pacific side and the Greenland Scotland Ridge on the Atlantic side. It is mostly covered by sea ice throughout the year and almost completely in winter. The Arctic Ocean's surface temperature and salinity vary seasonally as the ice cover melts and freezes; its salinity is the lowest on average of the five major oceans, due to low evaporation, heavy fresh water inflow from rivers and streams, and limited connection and outflow to surrounding oceanic waters with higher salinities. The summer shrinking of the ice has been quoted at 50%. The US National Snow and Ice Data Center (NSIDC) uses satellite data to provide a daily record of Arctic sea ice cover and the rate of melting compared to an average period and specific past years, showing a continuous decline in sea ice extent. In September 2012, the Arctic ice extent reached a new record minimum. Compared to the average extent (1979–2000), the sea ice had diminished by 49%.

The crystalline basement rocks of mountains around the Arctic Ocean were recrystallized or formed during the Ellesmerian orogeny, the regional phase of the larger Caledonian orogeny in the Paleozoic Era. Regional subsidence in the Jurassic and Triassic periods led to significant sediment deposition, creating many of the reservoirs for current day oil and gas deposits. During the Cretaceous period, the Canadian Basin opened, and tectonic activity due to the assembly of Alaska caused hydrocarbons to migrate toward what is now Prudhoe Bay. At the same time, sediments shed off the rising Canadian Rockies built out the large Mackenzie Delta. The rifting apart of the supercontinent Pangea, beginning in the Triassic period, opened the early Atlantic Ocean. Rifting then extended northward, opening the Arctic Ocean as mafic oceanic crust material erupted out of a branch of Mid-Atlantic Ridge. The Amerasia Basin may have opened first, with the Chukchi Borderland moved along to the northeast by transform faults. Additional spreading helped to create the "triple-junction" of the Alpha-Mendeleev Ridge in the Late Cretaceous epoch. Throughout the Cenozoic Era, the subduction of the Pacific plate, the collision of India with Eurasia, and the continued opening of the North Atlantic created new hydrocarbon traps. The seafloor began spreading from the Gakkel Ridge in the Paleocene Epoch and the Eocene Epoch, causing the Lomonosov Ridge to move farther from land and subside. Because of sea ice and remote conditions, the geology of the Arctic Ocean is still poorly explored. The Arctic Coring Expedition drilling shed some light on the Lomonosov Ridge, which appears to be continental crust separated from the Barents-Kara Shelf in the Paleocene and then starved of sediment. It may contain up to 10 billion barrels of oil. The Gakkel Ridge rift is also poorly understand and may extend into the Laptev Sea.

projected-18951556-018

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

Arctic Ocean

Climate

The Arctic Ocean is the smallest and shallowest of the world's five major oceans. It spans an area of approximately and is known as the coldest of all the oceans. The International Hydrographic Organization (IHO) recognizes it as an ocean, although some oceanographers call it the Arctic Mediterranean Sea. It has been described approximately as an estuary of the Atlantic Ocean. It is also seen as the northernmost part of the all-encompassing World Ocean. The Arctic Ocean includes the North Pole region in the middle of the Northern Hemisphere and extends south to about 60°N. The Arctic Ocean is surrounded by Eurasia and North America, and the borders follow topographic features: the Bering Strait on the Pacific side and the Greenland Scotland Ridge on the Atlantic side. It is mostly covered by sea ice throughout the year and almost completely in winter. The Arctic Ocean's surface temperature and salinity vary seasonally as the ice cover melts and freezes; its salinity is the lowest on average of the five major oceans, due to low evaporation, heavy fresh water inflow from rivers and streams, and limited connection and outflow to surrounding oceanic waters with higher salinities. The summer shrinking of the ice has been quoted at 50%. The US National Snow and Ice Data Center (NSIDC) uses satellite data to provide a daily record of Arctic sea ice cover and the rate of melting compared to an average period and specific past years, showing a continuous decline in sea ice extent. In September 2012, the Arctic ice extent reached a new record minimum. Compared to the average extent (1979–2000), the sea ice had diminished by 49%.

The Arctic Ocean is contained in a polar climate characterized by persistent cold and relatively narrow annual temperature ranges. Winters are characterized by the polar night, extreme cold, frequent low-level temperature inversions, and stable weather conditions. Cyclones are only common on the Atlantic side. Summers are characterized by continuous daylight (midnight sun), and air temperatures can rise slightly above . Cyclones are more frequent in summer and may bring rain or snow. It is cloudy year-round, with mean cloud cover ranging from 60% in winter to over 80% in summer. The temperature of the surface water of the Arctic Ocean is fairly constant at approximately , near the freezing point of seawater. The density of sea water, in contrast to fresh water, increases as it nears the freezing point and thus it tends to sink. It is generally necessary that the upper of ocean water cools to the freezing point for sea ice to form. In the winter, the relatively warm ocean water exerts a moderating influence, even when covered by ice. This is one reason why the Arctic does not experience the extreme temperatures seen on the Antarctic continent. There is considerable seasonal variation in how much pack ice of the Arctic ice pack covers the Arctic Ocean. Much of the Arctic ice pack is also covered in snow for about 10 months of the year. The maximum snow cover is in March or April—about over the frozen ocean. The climate of the Arctic region has varied significantly during the Earth's history. During the Paleocene–Eocene Thermal Maximum 55 million years ago, when the global climate underwent a warming of approximately , the region reached an average annual temperature of . The surface waters of the northernmost Arctic Ocean warmed, seasonally at least, enough to support tropical lifeforms (the dinoflagellates Apectodinium augustum) requiring surface temperatures of over . Currently, the Arctic region is warming twice as fast as the rest of the planet.

projected-18951905-001

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

Argentina

Etymology

Argentina (), officially the Argentine Republic (), is a country in the southern half of South America. Argentina covers an area of , making it the second-largest country in South America after Brazil, the fourth-largest country in the Americas, and the eighth-largest country in the world. It shares the bulk of the Southern Cone with Chile to the west, and is also bordered by Bolivia and Paraguay to the north, Brazil to the northeast, Uruguay and the South Atlantic Ocean to the east, and the Drake Passage to the south. Argentina is a federal state subdivided into twenty-three provinces, and one autonomous city, which is the federal capital and largest city of the nation, Buenos Aires. The provinces and the capital have their own constitutions, but exist under a federal system. Argentina claims sovereignty over the Falkland Islands, South Georgia and the South Sandwich Islands, and a part of Antarctica. The earliest recorded human presence in modern-day Argentina dates back to the Paleolithic period. The Inca Empire expanded to the northwest of the country in Pre-Columbian times. The country has its roots in Spanish colonization of the region during the 16th century. Argentina rose as the successor state of the Viceroyalty of the Río de la Plata, a Spanish overseas viceroyalty founded in 1776. The declaration and fight for independence (1810–1818) was followed by an extended civil war that lasted until 1861, culminating in the country's reorganization as a federation. The country thereafter enjoyed relative peace and stability, with several waves of European immigration, mainly Italians and Spaniards, radically reshaping its cultural and demographic outlook; over 60% of the population has full or partial Italian ancestry, and Argentine culture has significant connections to Italian culture. The almost-unparalleled increase in prosperity led to Argentina becoming the seventh-wealthiest nation in the world by the early 20th century. In 1896, Argentina's GDP per capita surpassed that of the United States and was consistently in the top ten before at least 1920. Currently, it is ranked 89th in the world. Following the Great Depression in the 1930s, Argentina descended into political instability and economic decline that pushed it back into underdevelopment, although it remained among the fifteen richest countries for several decades. Following the death of President Juan Perón in 1974, his widow and vice president, Isabel Perón, ascended to the presidency, before being overthrown in 1976. The following military junta, which was supported by the United States, persecuted and murdered thousands of political critics, activists, and leftists in the Dirty War, a period of state terrorism and civil unrest that lasted until the election of Raúl Alfonsín as president in 1983. Argentina is a regional power, and retains its historic status as a middle power in international affairs. A Major non-NATO ally, Argentina is a developing country that ranks 46th in the Human Development Index, the second-highest in Latin America after Chile. It maintains the second-largest economy in South America, and is a member of G-15 and G20. Argentina is also a founding member of the United Nations, World Bank, World Trade Organization, Mercosur, Community of Latin American and Caribbean States and the Organization of Ibero-American States.

The description of the region by the word Argentina has been found on a Venetian map in 1536. In English, the name "Argentina" comes from the Spanish language; however, the naming itself is not Spanish, but Italian. Argentina (masculine argentino) means in Italian "(made) of silver, silver coloured", derived from the Latin "argentum" for silver. In Italian, the adjective or the proper noun is often used in an autonomous way as a substantive and replaces it and it is said l'Argentina. The name Argentina was probably first given by the Venetian and Genoese navigators, such as Giovanni Caboto. In Spanish and Portuguese, the words for "silver" are respectively plata and prata and "(made) of silver" is plateado and prateado. Argentina was first associated with the silver mountains legend, widespread among the first European explorers of the La Plata Basin. The first written use of the name in Spanish can be traced to La Argentina, a 1602 poem by Martín del Barco Centenera describing the region. Although "Argentina" was already in common usage by the 18th century, the country was formally named "Viceroyalty of the Río de la Plata" by the Spanish Empire, and "United Provinces of the Río de la Plata" after independence. The 1826 constitution included the first use of the name "Argentine Republic" in legal documents. The name "Argentine Confederation" was also commonly used and was formalized in the Argentine Constitution of 1853. In 1860 a presidential decree settled the country's name as "Argentine Republic", and that year's constitutional amendment ruled all the names since 1810 as legally valid. In English, the country was traditionally called "the Argentine", mimicking the typical Spanish usage la Argentina and perhaps resulting from a mistaken shortening of the fuller name 'Argentine Republic'. 'The Argentine' fell out of fashion during the mid-to-late 20th century, and now the country is simply referred to as "Argentina".

projected-18955875-012

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

Tree

Ecology

In botany, a tree is a perennial plant with an elongated stem, or trunk, usually supporting branches and leaves. In some usages, the definition of a tree may be narrower, including only woody plants with secondary growth, plants that are usable as lumber or plants above a specified height. In wider definitions, the taller palms, tree ferns, bananas, and bamboos are also trees. Trees are not a taxonomic group but include a variety of plant species that have independently evolved a trunk and branches as a way to tower above other plants to compete for sunlight. The majority of tree species are angiosperms or hardwoods; of the rest, many are gymnosperms or softwoods. Trees tend to be long-lived, some reaching several thousand years old. Trees have been in existence for 370 million years. It is estimated that there are some three trillion mature trees in the world. A tree typically has many secondary branches supported clear of the ground by the trunk. This trunk typically contains woody tissue for strength, and vascular tissue to carry materials from one part of the tree to another. For most trees it is surrounded by a layer of bark which serves as a protective barrier. Below the ground, the roots branch and spread out widely; they serve to anchor the tree and extract moisture and nutrients from the soil. Above ground, the branches divide into smaller branches and shoots. The shoots typically bear leaves, which capture light energy and convert it into sugars by photosynthesis, providing the food for the tree's growth and development. Trees usually reproduce using seeds. Flowers and fruit may be present, but some trees, such as conifers, instead have pollen cones and seed cones. Palms, bananas, and bamboos also produce seeds, but tree ferns produce spores instead. Trees play a significant role in reducing erosion and moderating the climate. They remove carbon dioxide from the atmosphere and store large quantities of carbon in their tissues. Trees and forests provide a habitat for many species of animals and plants. Tropical rainforests are among the most biodiverse habitats in the world. Trees provide shade and shelter, timber for construction, fuel for cooking and heating, and fruit for food as well as having many other uses. In parts of the world, forests are shrinking as trees are cleared to increase the amount of land available for agriculture. Because of their longevity and usefulness, trees have always been revered, with sacred groves in various cultures, and they play a role in many of the world's mythologies.

Trees are an important part of the terrestrial ecosystem, providing essential habitats including many kinds of forest for communities of organisms. Epiphytic plants such as ferns, some mosses, liverworts, orchids and some species of parasitic plants (e.g., mistletoe) hang from branches; these along with arboreal lichens, algae, and fungi provide micro-habitats for themselves and for other organisms, including animals. Leaves, flowers and fruits are seasonally available. On the ground underneath trees there is shade, and often there is undergrowth, leaf litter, and decaying wood that provide other habitat. Trees stabilise the soil, prevent rapid run-off of rain water, help prevent desertification, have a role in climate control and help in the maintenance of biodiversity and ecosystem balance. Many species of tree support their own specialised invertebrates. In their natural habitats, 284 different species of insect have been found on the English oak (Quercus robur) and 306 species of invertebrate on the Tasmanian oak (Eucalyptus obliqua). Non-native tree species provide a less biodiverse community, for example in the United Kingdom the sycamore (Acer pseudoplatanus), which originates from southern Europe, has few associated invertebrate species, though its bark supports a wide range of lichens, bryophytes and other epiphytes. Trees differ ecologically in the ease with which they can be found by herbivores. Tree apparency varies with a tree's size and semiochemical content, and with the extent to which it is concealed by nonhost neighbours from its insect pests. In ecosystems such as mangrove swamps, trees play a role in developing the habitat, since the roots of the mangrove trees reduce the speed of flow of tidal currents and trap water-borne sediment, reducing the water depth and creating suitable conditions for further mangrove colonisation. Thus mangrove swamps tend to extend seawards in suitable locations. Mangrove swamps also provide an effective buffer against the more damaging effects of cyclones and tsunamis.

projected-05042951-001

https://en.wikipedia.org/wiki/Climate%20change

Climate change

Terminology

In common usage, climate change describes global warming—the ongoing increase in global average temperature—and its impacts on Earth's climate system. Climate change in a broader sense also includes previous long-term changes to Earth's climate. The current rise in global average temperature is more rapid than previous changes, and is primarily caused by humans burning fossil fuels. Fossil fuel use, deforestation, and some agricultural and industrial practices increase greenhouse gases like carbon dioxide and methane. Greenhouse gases absorb some of the heat that the Earth radiates after it warms from sunlight. Larger amounts of these gases trap more heat in Earth's lower atmosphere, causing global warming. Due to climate change, deserts are expanding, while heat waves and wildfires are becoming more common. Increased warming in the Arctic has contributed to melting permafrost, glacial retreat and sea ice loss. Higher temperatures are also causing more intense storms, droughts, and other weather extremes. Rapid environmental change in mountains, coral reefs, and the Arctic is forcing many species to relocate or become extinct. Climate change threatens people with food and water scarcity, increased flooding, extreme heat, more disease, and economic loss. Human migration and conflict can also be a result. The World Health Organization (WHO) calls climate change the greatest threat to global health in the 21st century. Even if efforts to minimise future warming are successful, some effects will continue for centuries. These include sea level rise, and warmer, more acidic oceans. Many of these impacts are already felt at the current level of warming. Additional warming will increase these impacts and may trigger tipping points, such as the melting of the Greenland ice sheet. Under the 2015 Paris Agreement, nations collectively agreed to keep warming "well under 2 °C". However, with pledges made under the Agreement, global warming would still reach about by the end of the century. Limiting warming to 1.5 °C will require halving emissions by 2030 and achieving net-zero emissions by 2050. Making deep cuts in emissions will require switching away from burning fossil fuels and towards using electricity generated from low-carbon sources. This includes phasing out coal and natural gas fired power plants, vastly increasing use of wind, solar, and other types of renewable energy, and taking measures to reduce energy use. Electricity generated from non-carbon-emitting sources will need to replace fossil fuels for powering transportation, heating buildings, and operating industrial facilities. Carbon can also be removed from the atmosphere, for instance by increasing forest cover and by farming with methods that capture carbon in soil. While communities may adapt to climate change through efforts like better coastline protection, they cannot avert the risk of severe, widespread, and permanent impacts.

Before the 1980s, when it was unclear whether the warming effect of increased greenhouse gases were stronger than the cooling effect of airborne particulates in air pollution, scientists used the term inadvertent climate modification to refer to human impacts on the climate. In the 1980s, the terms global warming and climate change became more common. Though the two terms are sometimes used interchangeably, scientifically, global warming refers only to increased surface warming, and climate change describes the full effect of greenhouse gases on Earth's climate system. Global warming—used as early as 1975—became the more popular term after NASA climate scientist James Hansen used it in his 1988 testimony in the U.S. Senate. Since the 2000s, climate change has increased in usage. Climate change can also refer more broadly to both human-caused changes or natural changes throughout Earth's history. Various scientists, politicians and media now use the terms climate crisis or climate emergency to talk about climate change, and global heating instead of global warming.

projected-05094570-009

https://en.wikipedia.org/wiki/Great%20Wall%20of%20China

Great Wall of China

Characteristics

The Great Wall of China () is a series of fortifications that were built across the historical northern borders of ancient Chinese states and Imperial China as protection against various nomadic groups from the Eurasian Steppe. Several walls were built from as early as the 7th century BC, with selective stretches later joined by Qin Shi Huang (220–206 BC), the first emperor of China. Little of the Qin wall remains. Later on, many successive dynasties built and maintained multiple stretches of border walls. The best-known sections of the wall were built by the Ming dynasty (1368–1644). Apart from defense, other purposes of the Great Wall have included border controls, allowing the imposition of duties on goods transported along the Silk Road, regulation or encouragement of trade and the control of immigration and emigration. Furthermore, the defensive characteristics of the Great Wall were enhanced by the construction of watchtowers, troop barracks, garrison stations, signaling capabilities through the means of smoke or fire, and the fact that the path of the Great Wall also served as a transportation corridor. The frontier walls built by different dynasties have multiple courses. Collectively, they stretch from Liaodong in the east to Lop Lake in the west, from the present-day SinoRussian border in the north to Tao River (Taohe) in the south; along an arc that roughly delineates the edge of the Mongolian steppe; spanning in total. Today, the defensive system of the Great Wall is generally recognized as one of the most impressive architectural feats in history.

Before the use of bricks, the Great Wall was mainly built from rammed earth, stones, and wood. During the Ming, however, bricks were heavily used in many areas of the wall, as were materials such as tiles, lime, and stone. The size and weight of the bricks made them easier to work with than earth and stone, so construction quickened. Additionally, bricks could bear more weight and endure better than rammed earth. Stone can hold under its own weight better than brick, but is more difficult to use. Consequently, stones cut into rectangular shapes were used for the foundation, inner and outer brims, and gateways of the wall. Battlements line the uppermost portion of the vast majority of the wall, with defensive gaps a little over tall, and about wide. From the parapets, guards could survey the surrounding land. Sticky rice mortar, consisting of sticky rice soup mixed with slaked lime, was extensively used to hold bricks together; no human bones or body parts were ever incorporated into the mortar or any part of the wall, contrary to what a legend states. Communication between the army units along the length of the Great Wall, including the ability to call reinforcements and warn garrisons of enemy movements, was of high importance. Signal towers were built upon hill tops or other high points along the wall for their visibility. Wooden gates could be used as a trap against those going through. Barracks, stables, and armories were built near the wall's inner surface.

wit-train-topic-000595927

projected-00869123-008

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

Gastroenteritis

Pathophysiology

Gastroenteritis, also known as infectious diarrhea and gastro, is inflammation of the gastrointestinal tract including the stomach and intestine. Symptoms may include diarrhea, vomiting, and abdominal pain. Fever, lack of energy, and dehydration may also occur. This typically lasts less than two weeks. It is not related to influenza, even though in the U.S. it is sometimes called the "stomach flu". Gastroenteritis is usually caused by viruses; however, gut bacteria, parasites, and fungi can also cause gastroenteritis. In children, rotavirus is the most common cause of severe disease. In adults, norovirus and Campylobacter are common causes. Eating improperly prepared food, drinking contaminated water or close contact with a person who is infected can spread the disease. Treatment is generally the same with or without a definitive diagnosis, so testing to confirm is usually not needed. For young children in impoverished countries, prevention includes hand washing with soap, drinking clean water, breastfeeding babies instead of using formula, and proper disposal of human waste. The rotavirus vaccine is recommended as a prevention for children. Treatment involves getting enough fluids. For mild or moderate cases, this can typically be achieved by drinking oral rehydration solution (a combination of water, salts and sugar). In those who are breastfed, continued breastfeeding is recommended. For more severe cases, intravenous fluids may be needed. Fluids may also be given by a nasogastric tube. Zinc supplementation is recommended in children. Antibiotics are generally not needed. However, antibiotics are recommended for young children with a fever and bloody diarrhea. In 2015, there were two billion cases of gastroenteritis, resulting in 1.3 million deaths globally. Children and those in the developing world are affected the most. In 2011, there were about 1.7 billion cases, resulting in about 700,000 deaths of children under the age of five. In the developing world, children less than two years of age frequently get six or more infections a year. It is less common in adults, partly due to the development of immunity.

Gastroenteritis is defined as vomiting or diarrhea due to inflammation of the small or large bowel, often due to infection. The changes in the small bowel are typically noninflammatory, while the ones in the large bowel are inflammatory. The number of pathogens required to cause an infection varies from as few as one (for Cryptosporidium) to as many as 108 (for Vibrio cholerae).

projected-03966054-001

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

Mexico

Etymology

Mexico, officially the United Mexican States, is a country in the southern portion of North America. It is bordered to the north by the United States; to the south and west by the Pacific Ocean; to the southeast by Guatemala, Belize, and the Caribbean Sea; and to the east by the Gulf of Mexico. Mexico covers , making it the world's 13th-largest country by area; with approximately 126,014,024 inhabitants, it is the 10th-most-populous country and has the most Spanish-speakers. Mexico is organized as a federal republic comprising 31 states and Mexico City, its capital. Other major urban areas include Monterrey, Guadalajara, Puebla, Toluca, Tijuana, Ciudad Juárez, and León. Pre-Columbian Mexico traces its origins to 8,000 BCE and is identified as one of the world's six cradles of civilization. In particular, the Mesoamerican region was home to many intertwined civilizations; including the Olmec, Maya, Zapotec, Teotihuacan, and Purepecha. Last were the Aztecs, who dominated the region in the century before European contact. In 1521, the Spanish Empire and its indigenous allies conquered the Aztec Empire from its capital Tenochtitlan (now Mexico City), establishing the colony of New Spain. Over the next three centuries, Spain and the Catholic Church played an important role expanding the territory, enforcing Christianity and spreading the Spanish language throughout. With the discovery of rich deposits of silver in Zacatecas and Guanajuato, New Spain soon became one of the most important mining centers worldwide. Wealth coming from Asia and the New World contributed to Spain's status as a major world power for the next centuries, and brought about a price revolution in Western Europe. The colonial order came to an end in the early nineteenth century with the War of Independence against Spain. Mexico's early history as an independent nation state was marked by political and socioeconomic upheaval, both domestically and in foreign affairs. The Federal Republic of Central America shortly seceded the country. Then two invasions by foreign powers took place: first, by the United States as a consequence of the Texas Revolt by American settlers, which led to the Mexican–American War and huge territorial losses in 1848. After the introduction of liberal reforms in the Constitution of 1857, conservatives reacted with the war of Reform and prompted France to invade the country and install an Empire, against the Republican resistance led by liberal President Benito Juárez, which emerged victorious. The last decades of the 19th century were dominated by the dictatorship of Porfirio Díaz, who sought to modernize Mexico and restore order. However, the Porfiriato era led to great social unrest and ended with the outbreak in 1910 of the decade-long Mexican Revolution (civil war). This conflict had profound changes in Mexican society, including the proclamation of the 1917 Constitution, which remains in effect to this day. The remaining war generals ruled as a succession of presidents until the Institutional Revolutionary Party (PRI) emerged in 1929. The PRI in turn governed Mexico for the next 70 years, first under a set of paternalistic developmental policies of considerable economic success. During World War II Mexico also played an important role for the U.S. war effort. Nonetheless, the PRI regime resorted to repression and electoral fraud to maintain power; and moved the country to a more US-aligned neoliberal economic policy during the late 20th century. This culminated with the signing of the North American Free Trade Agreement in 1994, which caused a major indigenous rebellion in the state of Chiapas. PRI lost the presidency for the first time in 2000, against the conservative party (PAN). Mexico is a developing country, ranking 74th on the Human Development Index, but has the world's 15th-largest economy by nominal GDP and the 11th-largest by PPP, with the United States being its largest economic partner. Its large economy and population, cultural influence, and steady democratization make Mexico a regional and middle power; it is often identified as an emerging power but is considered a newly industrialized state by several analysts. Mexico ranks first in the Americas and seventh in the world for the number of UNESCO World Heritage Sites. It is also one of the world's 17 megadiverse countries, ranking fifth in natural biodiversity. Mexico's rich cultural and biological heritage, as well as varied climate and geography, makes it a major tourist destination: as of 2018, it was the sixth most-visited country in the world, with 39 million international arrivals. However, the country continues to struggle with social inequality, poverty and extensive crime. It ranks poorly on the Global Peace Index, due in large part to ongoing conflict between drug trafficking syndicates, which violently compete for the US drug market and trade routes. This "drug war" has led to over 120,000 deaths since 2006. Mexico is a member of United Nations, the G20, the Organisation for Economic Co-operation and Development (OECD), the World Trade Organization (WTO), the Asia-Pacific Economic Cooperation forum, the Organization of American States, Community of Latin American and Caribbean States, and the Organization of Ibero-American States.

is the Nahuatl term for the heartland of the Aztec Empire, namely the Valley of Mexico and surrounding territories, with its people being known as the Mexica. The terms are plainly linked; it is generally believed that the toponym for the valley was the origin of the primary ethnonym for the Aztec Triple Alliance, but it may have been the other way around. In the colonial era (1521–1821) Mexico was called New Spain. In the eighteenth century, this central region became the Intendency of Mexico, during the reorganization of the empire, the Bourbon Reforms. After New Spain achieved independence from the Spanish Empire in 1821 and became a sovereign state, the territory came to be known as the State of Mexico, with the new country being named after its capital: Mexico City, which itself was founded in 1524 on the site of the ancient Mexica capital of Mexico-Tenochtitlan. The official name of the country has changed as the form of government has changed. The declaration of independence signed on 6 November 1813 by the deputies of the Congress of Anáhuac called the territory América Septentrional (Northern America); the 1821 Plan of Iguala also used América Septentrional. On two occasions (1821–1823 and 1863–1867), the country was known as (Mexican Empire). All three federal constitutions (1824, 1857 and 1917, the current constitution) used the name —or the variant , all of which have been translated as "United Mexican States". The phrase , "Mexican Republic", was used in the 1836 Constitutional Laws.