1.
Sphere
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A sphere is a perfectly round geometrical object in three-dimensional space that is the surface of a completely round ball. This distance r is the radius of the ball, and the point is the center of the mathematical ball. The longest straight line through the ball, connecting two points of the sphere, passes through the center and its length is twice the radius. While outside mathematics the terms sphere and ball are used interchangeably. The ball and the share the same radius, diameter. The surface area of a sphere is, A =4 π r 2, at any given radius r, the incremental volume equals the product of the surface area at radius r and the thickness of a shell, δ V ≈ A ⋅ δ r. The total volume is the summation of all volumes, V ≈ ∑ A ⋅ δ r. In the limit as δr approaches zero this equation becomes, V = ∫0 r A d r ′, substitute V,43 π r 3 = ∫0 r A d r ′. Differentiating both sides of equation with respect to r yields A as a function of r,4 π r 2 = A. Which is generally abbreviated as, A =4 π r 2, alternatively, the area element on the sphere is given in spherical coordinates by dA = r2 sin θ dθ dφ. In Cartesian coordinates, the element is d S = r r 2 − ∑ i ≠ k x i 2 ∏ i ≠ k d x i, ∀ k. For more generality, see area element, the total area can thus be obtained by integration, A = ∫02 π ∫0 π r 2 sin θ d θ d φ =4 π r 2. In three dimensions, the volume inside a sphere is derived to be V =43 π r 3 where r is the radius of the sphere, archimedes first derived this formula, which shows that the volume inside a sphere is 2/3 that of a circumscribed cylinder. In modern mathematics, this formula can be derived using integral calculus, at any given x, the incremental volume equals the product of the cross-sectional area of the disk at x and its thickness, δ V ≈ π y 2 ⋅ δ x. The total volume is the summation of all volumes, V ≈ ∑ π y 2 ⋅ δ x. In the limit as δx approaches zero this equation becomes, V = ∫ − r r π y 2 d x. At any given x, a right-angled triangle connects x, y and r to the origin, hence, applying the Pythagorean theorem yields, thus, substituting y with a function of x gives, V = ∫ − r r π d x. Which can now be evaluated as follows, V = π − r r = π − π =43 π r 3
2.
Spheroid
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A spheroid, or ellipsoid of revolution, is a quadric surface obtained by rotating an ellipse about one of its principal axes, in other words, an ellipsoid with two equal semi-diameters. If the ellipse is rotated about its axis, the result is a prolate spheroid. If the ellipse is rotated about its axis, the result is an oblate spheroid. If the generating ellipse is a circle, the result is a sphere, because of the combined effects of gravity and rotation, the Earths shape is not quite a sphere but instead is slightly flattened in the direction of its axis of rotation. For that reason, in cartography the Earth is often approximated by an oblate spheroid instead of a sphere, the current World Geodetic System model uses a spheroid whose radius is 6,378.137 km at the equator and 6,356.752 km at the poles. The semi-major axis a is the radius of the spheroid. There are two cases, c < a, oblate spheroid c > a, prolate spheroid The case of a = c reduces to a sphere. An oblate spheroid with c < a has surface area S o b l a t e =2 π a 2 where e 2 =1 − c 2 a 2. The oblate spheroid is generated by rotation about the z-axis of an ellipse with semi-major axis a and semi-minor axis c, therefore e may be identified as the eccentricity. A prolate spheroid with c > a has surface area S p r o l a t e =2 π a 2 where e 2 =1 − a 2 c 2. The prolate spheroid is generated by rotation about the z-axis of an ellipse with semi-major axis c and semi-minor axis a and these formulas are identical in the sense that the formula for Soblate can be used to calculate the surface area of a prolate spheroid and vice versa. However, e then becomes imaginary and can no longer directly be identified with the eccentricity, both of these results may be cast into many other forms using standard mathematical identities and relations between parameters of the ellipse. The volume inside a spheroid is 4π/3a2c ≈4. 19a2c, if A = 2a is the equatorial diameter, and C = 2c is the polar diameter, the volume is π/6A2C ≈0. 523A2C. Both of these curvatures are always positive, so every point on a spheroid is elliptic. These are just two of different parameters used to define an ellipse and its solid body counterparts. The most common shapes for the density distribution of protons and neutrons in an atomic nucleus are spherical, prolate and oblate spheroidal, deformed nuclear shapes occur as a result of the competition between electromagnetic repulsion between protons, surface tension and quantum shell effects. An extreme example of a planet in science fiction is Mesklin, in Hal Clements novel Mission of Gravity. The prolate spheroid is the shape of the ball in several sports, several moons of the Solar system approximate prolate spheroids in shape, though they are actually triaxial ellipsoids
3.
Juggling
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Juggling is a physical skill, performed by a juggler, involving the manipulation of objects for recreation, entertainment, art or sport. The most recognizable form of juggling is toss juggling, Juggling can be the manipulation of one object or many objects at the same time, using one or many hands. Jugglers often refer to the objects they juggle as props, the most common props are balls, clubs, or rings. Some jugglers use more dramatic objects such as knives, fire torches or chainsaws, the term juggling can also commonly refer to other prop-based manipulation skills, such as diabolo, devil sticks, poi, cigar boxes, contact juggling, hooping, yo-yo, and hat manipulation. The words juggling and juggler derive from the Middle English jogelen, there is also the Late Latin form joculare of Latin joculari, meaning to jest. In the 21st century, the term juggling usually refers to toss juggling, david Levinson and Karen Christensen describe juggling as the sport of tossing and catching or manipulating objects keeping them in constant motion. Juggling, like music, combines abstract patterns and mind-body coordination in a pleasing way, the earliest record of juggling is suggested in a panel from the 15th Beni Hasan tomb of an unknown Egyptian prince, showing female dancers and acrobats throwing balls. Juggling has been recorded in early cultures including Egyptian, Nabataean, Chinese, Indian, Greek, Roman, Norse, Aztec. Juggling in ancient China was an art performed by some warriors, one such warrior was Xiong Yiliao, whose juggling of nine balls in front of troops on a battlefield reportedly caused the opposing troops to flee without fighting, resulting in a complete victory. In Europe, juggling was an acceptable diversion until the decline of the Roman Empire, Jugglers in this era would only perform in marketplaces, streets, fairs, or drinking houses. They would perform short, humorous and bawdy acts and pass a hat or bag among the audience for tips, some kings and noblemen’s bards, fools, or jesters would have been able to juggle or perform acrobatics, though their main skills would have been oral. In 1768, Philip Astley opened the first modern circus, a few years later, he employed jugglers to perform acts along with the horse and clown acts. Since then, jugglers have been associated with circuses, in the early 19th century, troupes from Asia, such as the famous Indian Jugglers referred to by William Hazlitt, arrived to tour Britain, Europe and parts of America. In the 19th century, variety and music hall theatres became more popular, performers started specializing in juggling, separating it from other kinds of performance such as sword swallowing and magic. The Gentleman Juggler style was established by German jugglers such as Salerno, rubber processing developed, and jugglers started using rubber balls. Previously, juggling balls were made from balls of twine, stuffed leather bags, wooden spheres, solid or inflatable rubber balls meant that bounce juggling was possible. Inflated rubber balls made ball spinning easier and more readily accessible, soon in North America, vaudeville theatres employed jugglers, often hiring European performers. In the early to mid-20th century, variety and vaudeville shows decreased in popularity due to competition from motion picture theatres, radio and television, Music and comedy transferred very easily to radio, but juggling could not
4.
Ball bearing
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A ball bearing is a type of rolling-element bearing that uses balls to maintain the separation between the bearing races. The purpose of a bearing is to reduce rotational friction. It achieves this by using at least two races to contain the balls and transmit the loads through the balls, in most applications, one race is stationary and the other is attached to the rotating assembly. As one of the bearing races rotates it causes the balls to rotate as well, because the balls are rolling they have a much lower coefficient of friction than if two flat surfaces were sliding against each other. Ball bearings tend to have lower capacity for their size than other kinds of rolling-element bearings due to the smaller contact area between the balls and races. However, they can tolerate some misalignment of the inner and outer races and his was the first modern ball-bearing design, with the ball running along a groove in the axle assembly. There are several designs of ball bearing, each offering various trade-offs. They can be made many different materials, including, stainless steel, chrome steel. A hybrid ball bearing is a bearing with ceramic balls and races of metal, an angular contact ball bearing uses axially asymmetric races. An axial load passes in a line through the bearing. So the angle of contact on the race is the same as that on the outer race. Angular contact bearings better support combined loads and the angle of the bearing should be matched to the relative proportions of each. The larger the angle, the higher the axial load supported. In high speed applications, such as turbines, jet engines, and dentistry equipment, ceramics such as silicon nitride are now regularly used in such applications due to their low density. These materials significantly reduce centrifugal force and function well in high temperature environments and they also tend to wear in a similar way to bearing steel—rather than cracking or shattering like glass or porcelain. Most bicycles use angular-contact bearings in the headsets because the forces on these bearings are in both the radial and axial direction, an axial ball bearing uses side-by-side races. An axial load is transmitted directly through the bearing, while a radial load is supported and tends to separate the races. In a deep-groove radial bearing, the dimensions are close to the dimensions of the balls that run in it
5.
Engineering
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The term Engineering is derived from the Latin ingenium, meaning cleverness and ingeniare, meaning to contrive, devise. Engineering has existed since ancient times as humans devised fundamental inventions such as the wedge, lever, wheel, each of these inventions is essentially consistent with the modern definition of engineering. The term engineering is derived from the engineer, which itself dates back to 1390 when an engineer originally referred to a constructor of military engines. In this context, now obsolete, a referred to a military machine. Notable examples of the obsolete usage which have survived to the present day are military engineering corps, the word engine itself is of even older origin, ultimately deriving from the Latin ingenium, meaning innate quality, especially mental power, hence a clever invention. The earliest civil engineer known by name is Imhotep, as one of the officials of the Pharaoh, Djosèr, he probably designed and supervised the construction of the Pyramid of Djoser at Saqqara in Egypt around 2630–2611 BC. Ancient Greece developed machines in both civilian and military domains, the Antikythera mechanism, the first known mechanical computer, and the mechanical inventions of Archimedes are examples of early mechanical engineering. In the Middle Ages, the trebuchet was developed, the first steam engine was built in 1698 by Thomas Savery. The development of this gave rise to the Industrial Revolution in the coming decades. With the rise of engineering as a profession in the 18th century, similarly, in addition to military and civil engineering, the fields then known as the mechanic arts became incorporated into engineering. The inventions of Thomas Newcomen and the Scottish engineer James Watt gave rise to mechanical engineering. The development of specialized machines and machine tools during the revolution led to the rapid growth of mechanical engineering both in its birthplace Britain and abroad. John Smeaton was the first self-proclaimed civil engineer and is regarded as the father of civil engineering. He was an English civil engineer responsible for the design of bridges, canals, harbours and he was also a capable mechanical engineer and an eminent physicist. Smeaton designed the third Eddystone Lighthouse where he pioneered the use of hydraulic lime and his lighthouse remained in use until 1877 and was dismantled and partially rebuilt at Plymouth Hoe where it is known as Smeatons Tower. The United States census of 1850 listed the occupation of engineer for the first time with a count of 2,000, there were fewer than 50 engineering graduates in the U. S. before 1865. In 1870 there were a dozen U. S. mechanical engineering graduates, in 1890 there were 6,000 engineers in civil, mining, mechanical and electrical. There was no chair of applied mechanism and applied mechanics established at Cambridge until 1875, the theoretical work of James Maxwell and Heinrich Hertz in the late 19th century gave rise to the field of electronics
6.
Gunpowder
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Gunpowder, also known as black powder, is the earliest known chemical explosive. It is a mixture of sulfur, charcoal, and potassium nitrate, the sulfur and charcoal act as fuels, and the saltpeter is an oxidizer. Black powder firearms are in limited use today in hunting, shooting, Black powder has been replaced for most industrial uses by high explosives such as dynamite. Black powder is assigned the UN number UN0027 and has a class of 1. 1D. It has a point of approximately 427–464 °C. The specific flash point may vary based on the composition of the gunpowder. Gunpowders specific gravity is 1. 70–1.82 or 1. 92–2.08, Gunpowder is classified as a low explosive because of its relatively slow decomposition rate and consequently low brisance. Low explosives deflagrate at subsonic speeds, whereas high explosives detonate, ignition of the powder packed behind a bullet must generate enough pressure to force it from the muzzle at high speed, but not enough to rupture the gun barrel. Gunpowder thus makes a good propellant, but is suitable for shattering rock or fortifications. Gunpowder was widely used to fill artillery shells and in mining and civil engineering to blast rock until the half of the 19th century. Black powder is used as a delay element in various munitions where its slow-burning properties are valuable. The spread of gunpowder across Asia from China is widely attributed to the Mongols, the earliest record of a written formula for gunpowder appears in the 11th century Song dynasty text, Wujing Zongyao. This discovery led to the invention of fireworks and the earliest gunpowder weapons in China, in the centuries following the Chinese discovery, gunpowder weapons began appearing in the Muslim world and Europe. The technology spread from China through the Middle East or Central Asia, the earliest Western accounts of gunpowder appear in texts written by English philosopher Roger Bacon in the 13th century. The most ardent protagonists were Nathaniel Halhad, Johann Backmann, Quintin Craufurd, however, due to lack of sufficient proof, these theories have not been widely accepted. A major problem confronting the study of the history of gunpowder is ready access to sources close to the events described. The translation difficulty has led to errors or loose interpretations bordering on artistic licence, early writings potentially mentioning gunpowder are sometimes marked by a linguistic process where old words acquired new meanings. For instance, the Arabic word naft transitioned from denoting naphtha to denoting gunpowder, saltpeter was known to the Chinese by the mid-1st century AD and there is strong evidence of the use of saltpeter and sulfur in various largely medicinal combinations
7.
Projectile
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A projectile is any object thrown into space by the exertion of a force. Although any object in motion through space may be called a projectile, mathematical equations of motion are used to analyze projectile trajectory. Blowguns and pneumatic rifles use compressed gases, while most other guns and cannons utilize expanding gases liberated by sudden chemical reactions, light-gas guns use a combination of these mechanisms. Railguns utilize electromagnetic fields to provide a constant acceleration along the length of the device. Some projectiles provide propulsion during flight by means of an engine or jet engine. In military terminology, a rocket is unguided, while a missile is guided, note the two meanings of rocket, an ICBM is a guided missile with a rocket engine. An explosion, whether or not by a weapon, causes the debris to act as high velocity projectiles. An explosive weapon, or device may also be designed to produce high velocity projectiles by the break-up of its casing. Many projectiles, e. g. shells, may carry a charge or another chemical or biological substance. Aside from explosive payload, a projectile can be designed to cause damage, e. g. fire. Typical kinetic energy weapons are blunt projectiles such as rocks and round shots, pointed ones such as arrows, among projectiles that do not contain explosives are those launched from railguns, coilguns, and mass drivers, as well as kinetic energy penetrators. Other types of weapons are accelerated over time by a rocket engine. In either case, it is the energy of the projectile that destroys its target. Some kinetic weapons for targeting objects in spaceflight are anti-satellite weapons, since in order to reach an object in orbit it is necessary to attain an extremely high velocity, their released kinetic energy alone is enough to destroy their target, explosives are not necessary. For example, the energy of TNT is 4.6 MJ/kg, and this saves costly weight and there is no detonation to be precisely timed. This method, however, requires direct contact with the target, some hit-to-kill warheads are additionally equipped with an explosive directional warhead to enhance the kill probability. With regard to weapons, the Arrow missile and MIM-104 Patriot PAC-2 have explosives, while the Kinetic Energy Interceptor, Lightweight Exo-Atmospheric Projectile. A kinetic projectile can also be dropped from aircraft and this is applied by replacing the explosives of a regular bomb with a non-explosive material, for a precision hit with less collateral damage
8.
Rubber
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Natural rubber, also called India rubber or caoutchouc, as initially produced, consists of polymers of the organic compound isoprene, with minor impurities of other organic compounds, plus water. Malaysia and Indonesia are two of the leading rubber producers, forms of polyisoprene that are used as natural rubbers are classified as elastomers. Currently, rubber is harvested mainly in the form of the latex from the tree or others. The latex is a sticky, milky colloid drawn off by making incisions in the bark, the latex then is refined into rubber ready for commercial processing. In major areas, latex is allowed to coagulate in the collection cup, the coagulated lumps are collected and processed into dry forms for marketing. Natural rubber is used extensively in many applications and products, either alone or in combination with other materials, in most of its useful forms, it has a large stretch ratio and high resilience, and is extremely waterproof. The major commercial source of rubber latex is the Pará rubber tree. This species is preferred because it grows well under cultivation, a properly managed tree responds to wounding by producing more latex for several years. Congo rubber, formerly a source of rubber, came from vines in the genus Landolphia. These cannot be cultivated, and the drive to collect latex from wild plants was responsible for many of the atrocities committed under the Congo Free State. The latex exhibits the quality as the natural rubber from rubber trees. In the wild types of dandelion, latex content is low, in Nazi Germany, research projects tried to use dandelions as a base for rubber production, but failed. In collaboration with Continental Tires, IME began a pilot facility, many other plants produce forms of latex rich in isoprene polymers, though not all produce usable forms of polymer as easily as the Pará. Some of them require more processing to produce anything like usable rubber. Some produce other desirable materials, for example gutta-percha and chicle from Manilkara species, the term gum rubber is sometimes applied to the tree-obtained version of natural rubber in order to distinguish it from the synthetic version. The first use of rubber was by the cultures of Mesoamerica. The earliest archeological evidence of the use of latex from the Hevea tree comes the Olmec culture. The Pará rubber tree is indigenous to South America, charles Marie de La Condamine is credited with introducing samples of rubber to the Académie Royale des Sciences of France in 1736
9.
Christopher Columbus
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Christopher Columbus was an Italian explorer, navigator, colonizer, and citizen of the Republic of Genoa. Under the auspices of the Catholic Monarchs of Spain, he completed four voyages across the Atlantic Ocean and those voyages and his efforts to establish permanent settlements on the island of Hispaniola initiated the European colonization of the New World. Western imperialism and economic competition were emerging among European kingdoms through the establishment of routes and colonies. During his first voyage in 1492, he reached the New World instead of arriving at Japan as he had intended, landing on an island in the Bahamas archipelago that he named San Salvador. Over the course of three voyages, he visited the Greater and Lesser Antilles, as well as the Caribbean coast of Venezuela and Central America. These voyages had, therefore, an impact in the historical development of the modern Western world. He spearheaded the transatlantic trade and has been accused by several historians of initiating the genocide of the Hispaniola natives. Columbus himself saw his accomplishments primarily in the light of spreading the Christian religion, Columbus never admitted that he had reached a continent previously unknown to Europeans, rather than the East Indies for which he had set course. He called the inhabitants of the lands that he visited indios, the name Christopher Columbus is the Anglicisation of the Latin Christophorus Columbus. His name in Italian is Cristoforo Colombo and, in Spanish and he was born before 31 October 1451 in the territory of the Republic of Genoa, though the exact location remains disputed. His father was Domenico Colombo, a wool weaver who worked both in Genoa and Savona and who also owned a cheese stand at which young Christopher worked as a helper. Bartolomeo, Giovanni Pellegrino, and Giacomo were his brothers, Bartolomeo worked in a cartography workshop in Lisbon for at least part of his adulthood. He also had a sister named Bianchinetta, Columbus never wrote in his native language, which is presumed to have been a Genoese variety of Ligurian. In one of his writings, he says he went to sea at the age of 10, in 1470, the Columbus family moved to Savona, where Domenico took over a tavern. In the same year, Christopher was on a Genoese ship hired in the service of René of Anjou to support his attempt to conquer the Kingdom of Naples. Some modern historians have argued that he was not from Genoa but, instead and these competing hypotheses have generally been discounted by mainstream scholars. In 1473, Columbus began his apprenticeship as business agent for the important Centurione, Di Negro, later, he allegedly made a trip to Chios, an Aegean island then ruled by Genoa. In May 1476, he took part in a convoy sent by Genoa to carry valuable cargo to northern Europe
10.
Mesoamerican ballgame
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The Mesoamerican ballgame was a sport with ritual associations played since 1400 BCE by the pre-Columbian peoples of Ancient Mesoamerica. The sport had different versions in different places during the millennia, the rules of ōllamaliztli are not known, but judging from its descendant, ulama, they were probably similar to racquetball, where the aim is to keep the ball in play. The stone ballcourt goals are an addition to the game. In the most common theory of the game, the struck the ball with their hips, although some versions allowed the use of forearms, rackets, bats. The ball was made of rubber and weighed as much as 4 kg. The game had important ritual aspects, and major formal ballgames were held as ritual events, Late in the history of the game, some cultures occasionally seem to have combined competitions with religious human sacrifice. The sport was also played casually for recreation by children and may have played by women as well. Pre-Columbian ballcourts have been found throughout Mesoamerica, as for example at Copán, as far south as modern Nicaragua and these ballcourts vary considerably in size, but all have long narrow alleys with slanted side-walls against which the balls could bounce. It is not known precisely when or where ōllamaliztli originated, although it is likely that the game originated earlier than 1400 BCE in the tropical zones home to the rubber tree. One candidate for the birthplace of the ballgame is the Soconusco coastal lowlands along the Pacific Ocean, here, at Paso de la Amada, archaeologists have found the oldest ballcourt yet discovered, dated to approximately 1400 BCE. The other major candidate is the Olmec heartland, across the Isthmus of Tehuantepec along the Gulf Coast, the Aztecs referred to their Postclassic contemporaries who then inhabited the region as the Olmeca since the region was strongly identified with latex production. The earliest-known rubber balls come from the bog at El Manatí. Villagers, and subsequently archaeologists, have recovered a dozen balls ranging in diameter from 10 to 22 cm from the spring there. Five of these balls have been dated to the occupational phase for the site. These rubber balls were found with other ritual offerings buried at the site, indicating that even at this early date ōllamaliztli had religious, excavations at the nearby Olmec site of San Lorenzo Tenochtitlán have also uncovered a number of ballplayer figurines, radiocarbon-dated as far back as 1250–1150 BCE. A rudimentary ballcourt, dated to an occupation at San Lorenzo. From the tropical lowlands, ōllamaliztli apparently moved into central Mexico, starting around 1000 BCE or earlier, ballplayer figurines were interred with burials at Tlatilco and similarly styled figurines from the same period have been found at the nearby Tlapacoya site. It was about this period, as well, that the so-called Xochipala-style ballplayer figurines were crafted in Guerrero and it is known in Spanish as juego de pelota, in Classic Maya as pitz, and in modern Nahuatl as ōllamaliztli
11.
Middle English
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This stage of the development of the English language roughly followed the High to the Late Middle Ages. Middle English developed out of Late Old English, seeing many dramatic changes in its grammar, pronunciation and this largely forms the basis for Modern English spelling, although pronunciation has changed considerably since that time. Middle English was succeeded in England by the era of Early Modern English, by that time, a variant of the Northumbrian dialect was developing into the Scots language. During the Middle English period many Old English grammatical features were simplified or disappeared, noun, adjective and verb inflections were simplified, a process that included the reduction of most grammatical case distinctions. Middle English also saw an adoption of Norman French vocabulary, especially in areas such as politics, law. Everyday English vocabulary remained mostly Germanic, with Old Norse influence becoming apparent, significant changes in pronunciation took place, especially for long vowels and diphthongs, which in the later Middle English period began to undergo the Great Vowel Shift. Little survives of early Middle English literature, most likely due to the Norman domination, poets wrote both in the vernacular and courtly English. It is popularly believed that William Shakespeare wrote in Middle English, the latter part of the 11th century was a period of transition from Late Old English to Early Middle English. The influence of Old Norse certainly helped move English from a synthetic language towards a more analytic or isolating word order and it was, after all, a salutary influence. The gain was greater than the loss, there was a gain in directness, in clarity, and in strength. The change to Old English from Old Norse was substantive, pervasive and it is most important to recognise that in many words the English and Scandinavian language differed chiefly in their inflectional elements. The body of the word was so nearly the same in the two languages only the endings would put obstacles in the way of mutual understanding. In the mixed population which existed in the Danelaw these endings must have led to confusion, tending gradually to become obscured. This blending of peoples and languages resulted in simplifying English grammar. There are also many Norman-derived terms relating to the cultures that arose in the 12th century. Sometimes, and particularly later, words were taken from Latin, giving such sets as kingly, later French borrowings came from standard rather than Norman French, this leads to such cognate pairs as warden, guardian. The end of Anglo-Saxon rule did not, of course, change the language immediately, the general population would have spoken the same dialects as before the Conquest, these changed slowly until written records of them became available for study, which varies in different regions. Once the writing of Old English came to an end, Middle English had no standard language, Early Middle English has a largely Anglo-Saxon vocabulary, but a greatly simplified inflectional system
12.
Old Norse
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Old Norse was a North Germanic language that was spoken by inhabitants of Scandinavia and inhabitants of their overseas settlements during about the 9th to 13th centuries. These dates, however, are not absolute, since written Old Norse is found well into the 15th century, Old Norse was divided into three dialects, Old West Norse, Old East Norse and Old Gutnish. Old West and East Norse formed a continuum, with no clear geographical boundary between them. For example, Old East Norse traits were found in eastern Norway, although Old Norwegian is classified as Old West Norse, most speakers spoke Old East Norse in what is present day Denmark and Sweden. Old Gutnish, the more obscure dialectal branch, is included in the Old East Norse dialect due to geographical associations. It developed its own features and shared in changes to both other branches. The 12th century Icelandic Gray Goose Laws state that Swedes, Norwegians, Icelanders and Danes spoke the same language, another term used, used especially commonly with reference to West Norse, was norrœnt mál. In some instances the term Old Norse refers specifically to Old West Norse, the Old East Norse dialect was spoken in Denmark, Sweden, settlements in Kievan Rus, eastern England, and Danish settlements in Normandy. The Old Gutnish dialect was spoken in Gotland and in settlements in the East. In the 11th century, Old Norse was the most widely spoken European language, in Kievan Rus, it survived the longest in Veliky Novgorod, probably lasting into the 13th century there. Norwegian is descended from Old West Norse, but over the centuries it has heavily influenced by East Norse. Old Norse also had an influence on English dialects and Lowland Scots and it also influenced the development of the Norman language, and through it and to a smaller extent, that of modern French. Various other languages, which are not closely related, have heavily influenced by Norse, particularly the Norman dialects, Scottish Gaelic. The current Finnish and Estonian words for Sweden are Ruotsi and Rootsi, of the modern languages, Icelandic is the closest to Old Norse. Written modern Icelandic derives from the Old Norse phonemic writing system, contemporary Icelandic-speakers can read Old Norse, which varies slightly in spelling as well as semantics and word order. However, pronunciation, particularly of the phonemes, has changed at least as much as in the other North Germanic languages. Faroese retains many similarities but is influenced by Danish, Norwegian, although Swedish, Danish and the Norwegian languages have diverged the most, they still retain asymmetric mutual intelligibility. Speakers of modern Swedish, Norwegian and Danish can mostly understand each other without studying their neighboring languages, the languages are also sufficiently similar in writing that they can mostly be understood across borders
13.
Proto-Germanic
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Proto-Germanic is the reconstructed proto-language of the Germanic branch of the Indo-European languages. The end of the Common Germanic period is reached with the beginning of the Migration Period in the fourth century, the Proto-Germanic language is not directly attested by any coherent surviving texts, it has been reconstructed using the comparative method. Fragmentary direct attestation exists of Common Germanic in early runic inscriptions, the Proto-Germanic language developed in southern Scandinavia, the Urheimat of the Germanic tribes. Proto-Germanic developed out of pre-Proto-Germanic during the Pre-Roman Iron Age of Northern Europe, Proto-Germanic itself was likely spoken after c. Early Germanic expansion in the Pre-Roman Iron Age placed Proto-Germanic speakers in contact with the Continental Celtic La Tène horizon, a number of Celtic loanwords in Proto-Germanic have been identified. By the 1st century AD, Germanic expansion reaches the Danube and the Upper Rhine in the south, at about the same time, extending east of the Vistula, Germanic speakers come into contact with early Slavic cultures, as reflected in early Germanic loans in Proto-Slavic. By the 3rd century, LPGmc speakers had expanded over significant distance, the period marks the breakup of Late Proto-Germanic and the beginning of the Germanic migrations. The earliest coherent text in Proto-Norse become available c.400 in runic inscriptions, the delineation of Late Common Germanic from Proto-Norse about then is largely a matter of convention. Early West Germanic becomes available in the 5th century with the Frankish Bergakker inscription, between the two points, many sound changes occurred. Phylogeny as applied to historical linguistics involves the descent of languages. The Germanic languages form a tree with Proto-Germanic at its root that is a branch of the Indo-European tree, borrowing of lexical items from contact languages makes the relative position of the Germanic branch within Indo-European less clear than the positions of the other branches of Indo-European. In the course of the development of linguistics, various solutions have been proposed, none certain. In the evolutionary history of a family, philologists consider a genetic tree model appropriate only if communities do not remain in effective contact as their languages diverge. The internal diversification of West Germanic developed in an especially non-treelike manner, Proto-Germanic is generally agreed to have begun about 500 BC. Its hypothetical ancestor between the end of Proto-Indo-European and 500 BC is termed Pre-Proto-Germanic, whether it is to be included under a wider meaning of Proto-Germanic is a matter of usage. The fixation of the led to sound changes in unstressed syllables. For Lehmann, the boundary was the dropping of final -a or -e in unstressed syllables, for example, post-PIE *wóyd-e > Gothic wait. Antonsen agreed with Lehmann about the boundary but later found runic evidence that the -a was not dropped, ékwakraz … wraita, I, Wakraz
14.
Old High German
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Old High German is the earliest stage of the German language, conventionally covering the period from around 700 to 1050. Coherent written texts do not appear until the half of the 8th century. There are, however, a number of Elder Futhark inscriptions dating to the 6th century, as well as single words, during the migration period, the Elbe Germanic tribes settled in what became Alamannia, the Duchy of Bavaria and the Kingdom of Lombardy. Old High German comprises the dialects of these groups which underwent the Second Sound Shift during the 6th Century, namely all of Elbe Germanic, in the south, the Langobards, who had settled in Northern Italy, maintained their dialect until their conquest by Charlemagne in 774. This area did not become German-speaking again until the German eastward expansion of the early 12th century, though there was some attempt at conquest, Old High German literacy is a product of the monasteries, notably at St. Gallen, Reichenau and Fulda. Its origins lie in the establishment of the German church by Boniface in the mid 8th century, einhard tells how Charlemagne himself ordered that the epic lays should be collected for posterity. It was the neglect or religious zeal of later generations that led to the loss of these records, thus, it was Charlemagnes weak successor, Louis the Pious, who destroyed his fathers collection of epic poetry on account of its pagan content. Hrabanus Maurus, a student of Alcuins and abbot at Fulda from 822, was an important advocate of the cultivation of German literacy, among his students were Walafrid Strabo and Otfrid of Weissenburg. Notker Labeo towards the end of the Old High German period was among the greatest stylists in the language, the main difference between Old High German and the West Germanic dialects from which it developed is that it underwent the High German consonant shift. This is generally dated approximately to the late 5th and early 6th centuries—hence dating its start to around 500, the result of this sound change is that the consonantal system of German remains different from all other West Germanic languages, including English and Low German. Grammatically, however, Old High German remained very similar to Old English, Old Dutch, by the mid 11th century the many different vowels found in unstressed syllables had all been reduced to /ə/. Since these vowels were part of the endings in the nouns and verbs. For these reasons,1050 is seen as the start of the Middle High German period, for this reason the dialects may be termed monastery dialects. It declined after the conquest of the Lombard Kingdom by the Franks in 774 and it is classified as Upper German on the basis of evidence of the Second Sound Shift. The continued existence of a West Frankish dialect in the Western, claims that this might have been the language of the Carolingian court or that it is attested in the Ludwigslied, whose presence in a French manuscript suggests bilingualism, are controversial. The charts show the vowel and consonant systems of the East Franconian dialect in the 9th century and this is the dialect of the monastery of Fulda, and specifically of the Old High German Tatian. Old High German had five long vowels and six phonemic short vowels. Both occurred in stressed and unstressed syllables, notes, All back vowels likely had front-vowel allophones as a result of Umlaut
15.
Ancient Greek
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Ancient Greek includes the forms of Greek used in ancient Greece and the ancient world from around the 9th century BC to the 6th century AD. It is often divided into the Archaic period, Classical period. It is antedated in the second millennium BC by Mycenaean Greek, the language of the Hellenistic phase is known as Koine. Koine is regarded as a historical stage of its own, although in its earliest form it closely resembled Attic Greek. Prior to the Koine period, Greek of the classic and earlier periods included several regional dialects, Ancient Greek was the language of Homer and of fifth-century Athenian historians, playwrights, and philosophers. It has contributed many words to English vocabulary and has been a subject of study in educational institutions of the Western world since the Renaissance. This article primarily contains information about the Epic and Classical phases of the language, Ancient Greek was a pluricentric language, divided into many dialects. The main dialect groups are Attic and Ionic, Aeolic, Arcadocypriot, some dialects are found in standardized literary forms used in literature, while others are attested only in inscriptions. There are also several historical forms, homeric Greek is a literary form of Archaic Greek used in the epic poems, the Iliad and Odyssey, and in later poems by other authors. Homeric Greek had significant differences in grammar and pronunciation from Classical Attic, the origins, early form and development of the Hellenic language family are not well understood because of a lack of contemporaneous evidence. Several theories exist about what Hellenic dialect groups may have existed between the divergence of early Greek-like speech from the common Proto-Indo-European language and the Classical period and they have the same general outline, but differ in some of the detail. The invasion would not be Dorian unless the invaders had some relationship to the historical Dorians. The invasion is known to have displaced population to the later Attic-Ionic regions, the Greeks of this period believed there were three major divisions of all Greek people—Dorians, Aeolians, and Ionians, each with their own defining and distinctive dialects. Often non-west is called East Greek, Arcadocypriot apparently descended more closely from the Mycenaean Greek of the Bronze Age. Boeotian had come under a strong Northwest Greek influence, and can in some respects be considered a transitional dialect, thessalian likewise had come under Northwest Greek influence, though to a lesser degree. Most of the dialect sub-groups listed above had further subdivisions, generally equivalent to a city-state and its surrounding territory, Doric notably had several intermediate divisions as well, into Island Doric, Southern Peloponnesus Doric, and Northern Peloponnesus Doric. The Lesbian dialect was Aeolic Greek and this dialect slowly replaced most of the older dialects, although Doric dialect has survived in the Tsakonian language, which is spoken in the region of modern Sparta. Doric has also passed down its aorist terminations into most verbs of Demotic Greek, by about the 6th century AD, the Koine had slowly metamorphosized into Medieval Greek
16.
Russian language
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Russian is an East Slavic language and an official language in Russia, Belarus, Kazakhstan, Kyrgyzstan and many minor or unrecognised territories. Russian belongs to the family of Indo-European languages and is one of the four living members of the East Slavic languages, written examples of Old East Slavonic are attested from the 10th century and beyond. It is the most geographically widespread language of Eurasia and the most widely spoken of the Slavic languages and it is also the largest native language in Europe, with 144 million native speakers in Russia, Ukraine and Belarus. Russian is the eighth most spoken language in the world by number of native speakers, the language is one of the six official languages of the United Nations. Russian is also the second most widespread language on the Internet after English, Russian distinguishes between consonant phonemes with palatal secondary articulation and those without, the so-called soft and hard sounds. This distinction is found between pairs of almost all consonants and is one of the most distinguishing features of the language, another important aspect is the reduction of unstressed vowels. Russian is a Slavic language of the Indo-European family and it is a lineal descendant of the language used in Kievan Rus. From the point of view of the language, its closest relatives are Ukrainian, Belarusian, and Rusyn. An East Slavic Old Novgorod dialect, although vanished during the 15th or 16th century, is considered to have played a significant role in the formation of modern Russian. In the 19th century, the language was often called Great Russian to distinguish it from Belarusian, then called White Russian and Ukrainian, however, the East Slavic forms have tended to be used exclusively in the various dialects that are experiencing a rapid decline. In some cases, both the East Slavic and the Church Slavonic forms are in use, with different meanings. For details, see Russian phonology and History of the Russian language and it is also regarded by the United States Intelligence Community as a hard target language, due to both its difficulty to master for English speakers and its critical role in American world policy. The standard form of Russian is generally regarded as the modern Russian literary language, mikhail Lomonosov first compiled a normalizing grammar book in 1755, in 1783 the Russian Academys first explanatory Russian dictionary appeared. By the mid-20th century, such dialects were forced out with the introduction of the education system that was established by the Soviet government. Despite the formalization of Standard Russian, some nonstandard dialectal features are observed in colloquial speech. Thus, the Russian language is the 6th largest in the world by number of speakers, after English, Mandarin, Hindi/Urdu, Spanish, Russian is one of the six official languages of the United Nations. Education in Russian is still a choice for both Russian as a second language and native speakers in Russia as well as many of the former Soviet republics. Russian is still seen as an important language for children to learn in most of the former Soviet republics, samuel P. Huntington wrote in the Clash of Civilizations, During the heyday of the Soviet Union, Russian was the lingua franca from Prague to Hanoi
17.
Human baby
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An infant is the more formal or specialised synonym for baby, the very young offspring of a human or other animal. A newborn is, in use, an infant who is only hours, days. In medical contexts, newborn or neonate refers to an infant in the first 28 days after birth, the term applies to premature, full term, and postmature infants, before birth, the term fetus is used. The term infant is typically applied to children under one year of age, however, definitions may vary. When a human child learns to walk, the toddler may be used instead. In British English, infant is a term that can be applied to children aged between four and seven. As a legal term, infancy continues from birth until age 18, a newborns shoulders and hips are wide, the abdomen protrudes slightly, and the arms and legs are relatively long with respect to the rest of their body. In first world nations, the total body length of newborns are 35. 6–50.8 cm. The Apgar score is a measure of a transition from the uterus during the first minutes after birth. In developed countries, the birth weight of a full-term newborn is approximately 3.4 kg. After the first week, healthy term neonates should gain 10–20 grams/day, a newborns head is very large in proportion to the body, and the cranium is enormous relative to his or her face. While the adult human skull is one seventh of the total body length. Normal head circumference for an infant is 33–36 cm at birth. At birth, many regions of the skull have not yet been converted to bone. The two largest are the anterior fontanel, located at the top front portion of the head, and the smaller triangular-shaped posterior fontanel. Later in the life, these bones will fuse together in a natural process. A protein called noggin is responsible for the delay in an infants skull fusion, during labour and birth, the infants skull changes shape to fit through the birth canal, sometimes causing the child to be born with a misshapen or elongated head. It will usually return to normal on its own within a few days or weeks, special exercises sometimes advised by physicians may assist the process
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Kitten
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A kitten, also known as a kitty or kitty cat, is a juvenile cat. After being born, kittens are totally dependent on their mother for survival, after about two weeks, kittens quickly develop and begin to explore the world outside the nest. After a further three to four weeks, they begin to eat food and grow adult teeth. Domestic kittens are highly social animals and enjoy human companionship, the word kitten derives from the Middle English word kitoun, which in turn came from the Old French chitoun or cheton. A feline litter usually consists of two to five kittens born after a gestation lasting between 64 and 67 days, with a length of 66 days. Kittens emerge in a sac called the amnion, which is bitten off, for the first several weeks, kittens are unable to urinate or defecate without being stimulated by their mother. They are also unable to regulate their temperature for the first three weeks, so kittens born in temperatures less than 27 °C can die from hypothermia if their mother does not keep them warm. The mothers milk is very important for the nutrition and proper growth. This milk transfers antibodies to the kittens, which protect them against infectious disease. Newborn kittens are unable to produce concentrated urine, and so have a high requirement for fluids. Kittens open their eyes about seven to ten days after birth, at first, the retina is poorly developed and vision is poor. Kittens are not able to see as well as adult cats until about ten weeks after birth, Kittens develop very quickly from about two weeks of age until their seventh week. They play-fight with their litter-mates and begin to explore the world outside the nest or den and they learn to wash themselves and others as well as play hunting and stalking games, showing their inborn ability as predators. These innate skills are developed by the mother or other adult cats. Later, the adult cats demonstrate hunting techniques for the kittens to emulate, as they reach three to four weeks old, the kittens are gradually weaned and begin to eat solid food, with weaning usually complete by six to eight weeks. Kittens generally begin to lose their baby teeth around three months of age, and have a set of adult teeth by nine months. Kittens live primarily on solid food after weaning, but usually continue to suckle from time to time until separated from their mothers, some mother cats will scatter their kittens as early as three months of age, while others continue to look after them until they approach sexual maturity. The sex of kittens is usually easy to determine at birth, by six to eight weeks they are harder to sex because of the growth of fur in the genital region
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Puppy
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A puppy is a juvenile dog. Some puppies can weigh 1–3 lb, while larger ones can weigh up to 15–23 lb, all healthy puppies grow quickly after birth. A puppys coat color may change as the puppy grows older, in vernacular English, puppy refers specifically to dogs, while pup may often be used for other mammals such as seals, giraffes, guinea pigs, or even rats. Born after an average of 63 days of gestation, puppies emerge in an amnion that is bitten off, puppies begin to nurse almost immediately. As they reach one month of age, puppies are gradually weaned, the mother may regurgitate partially digested food for the puppies or might let them eat some of her solid food. The mother dog usually refuses to nurse at this stage, though she might let them occasionally nurse for comfort, at first, puppies spend the large majority of their time sleeping and the rest feeding. They instinctively pile together into a heap, and become distressed if separated from physical contact with their littermates, puppies are born with a fully functional sense of smell but cant open their eyes. During their first two weeks, a puppys senses all develop rapidly, during this stage the nose is the primary sense organ used by puppies to find their mothers teats, and to locate their littermates, if they become separated by a short distance. Puppies open their eyes about nine to eleven days following birth, at first, their retinas are poorly developed and their vision is poor. Puppies are not able to see as well as adult dogs, in addition, puppies ears remain sealed until about thirteen to seventeen days after birth, after which they respond more actively to sounds. Between two and four weeks old, puppies usually begin to growl, bite, wag their tails, puppies develop very quickly during their first three months, particularly after their eyes and ears open and they are no longer completely dependent on their mother. Their coordination and strength improve, they spar with their littermates and they play wrestling, chase, dominance, and tug-of-war games. Puppies are highly social animals and spend most of their waking hours interacting with either their mother or littermates, when puppies are socialized with humans, particularly between the ages of eight and twelve weeks, they develop social skills around people. Those that do not receive adequate socialization during this period may display fearful behavior around humans or other dogs as adults, the practice of docking began primarily as a preventive measure for injury among working dogs. Docking is now performed for purely cosmetic reasons, and some breeds traditionally have their tails cropped anywhere from slightly to almost entirely. Many countries now ban cropping and docking for cosmetic purposes, like Australia, parts of Canada, as of 2008, the practice is opposed by the American Veterinary Medical Association. Some breeders also prefer to declaw the dogs to prevent future injuries caused by scratching, or in the case of dewclaws, ingrown, Docking and declawing procedures are usually performed within the first few days after birth, by a veterinarian, or by an experienced breeder. Puppies Companion dog Canine Developmental Diet Docking Sell a pup, buy a pup Kitten Cunliffe, the New Encyclopedia of the Dog
20.
Ancient Egypt
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Ancient Egypt was a civilization of ancient Northeastern Africa, concentrated along the lower reaches of the Nile River in what is now the modern country of Egypt. It is one of six civilizations to arise independently, Egyptian civilization followed prehistoric Egypt and coalesced around 3150 BC with the political unification of Upper and Lower Egypt under the first pharaoh Narmer. In the aftermath of Alexander the Greats death, one of his generals, Ptolemy Soter and this Greek Ptolemaic Kingdom ruled Egypt until 30 BC, when, under Cleopatra, it fell to the Roman Empire and became a Roman province. The success of ancient Egyptian civilization came partly from its ability to adapt to the conditions of the Nile River valley for agriculture, the predictable flooding and controlled irrigation of the fertile valley produced surplus crops, which supported a more dense population, and social development and culture. Its art and architecture were widely copied, and its antiquities carried off to far corners of the world and its monumental ruins have inspired the imaginations of travelers and writers for centuries. The Nile has been the lifeline of its region for much of human history, nomadic modern human hunter-gatherers began living in the Nile valley through the end of the Middle Pleistocene some 120,000 years ago. By the late Paleolithic period, the climate of Northern Africa became increasingly hot and dry. In Predynastic and Early Dynastic times, the Egyptian climate was less arid than it is today. Large regions of Egypt were covered in treed savanna and traversed by herds of grazing ungulates, foliage and fauna were far more prolific in all environs and the Nile region supported large populations of waterfowl. Hunting would have been common for Egyptians, and this is also the period when many animals were first domesticated. The largest of these cultures in upper Egypt was the Badari, which probably originated in the Western Desert, it was known for its high quality ceramics, stone tools. The Badari was followed by the Amratian and Gerzeh cultures, which brought a number of technological improvements, as early as the Naqada I Period, predynastic Egyptians imported obsidian from Ethiopia, used to shape blades and other objects from flakes. In Naqada II times, early evidence exists of contact with the Near East, particularly Canaan, establishing a power center at Hierakonpolis, and later at Abydos, Naqada III leaders expanded their control of Egypt northwards along the Nile. They also traded with Nubia to the south, the oases of the desert to the west. Royal Nubian burials at Qustul produced artifacts bearing the oldest-known examples of Egyptian dynastic symbols, such as the crown of Egypt. They also developed a ceramic glaze known as faience, which was used well into the Roman Period to decorate cups, amulets, and figurines. During the last predynastic phase, the Naqada culture began using written symbols that eventually were developed into a system of hieroglyphs for writing the ancient Egyptian language. The Early Dynastic Period was approximately contemporary to the early Sumerian-Akkadian civilisation of Mesopotamia, the third-century BC Egyptian priest Manetho grouped the long line of pharaohs from Menes to his own time into 30 dynasties, a system still used today
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Homer
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Homer is the name ascribed by the ancient Greeks to the semi-legendary author of the Iliad and the Odyssey, two epic poems which are the central works of Greek literature. The Odyssey focuses on the home of Odysseus, king of Ithaca. Many accounts of Homers life circulated in classical antiquity, the most widespread being that he was a bard from Ionia. The modern scholarly consensus is that these traditions do not have any historical value, the Homeric question - by whom, when, where and under what circumstances were the Iliad and Odyssey composed - continues to be debated. Broadly speaking, modern scholarly opinion on the authorship question falls into two camps, one group holds that most of the Iliad and the Odyssey is the work of a single poet of genius. The other considers the Homeric poems to be the crystallization of a process of working and re-working by many contributors and it is generally accepted that the poems were composed at some point around the late eighth or early seventh century B. C. Most researchers believe that the poems were transmitted orally. The Homeric epics were the greatest influence on ancient Greek culture and education, to Plato, the chronological period of Homer depends on the meaning to be assigned to the word Homer. Was Homer a single person, an imaginary person representing a group of poets and this information is often called the world of Homer. The Homeric period would in that cover a number of historical periods, especially the Mycenaean Age. Considered word-for-word, the texts as we know them are the product of the scholars of the last three centuries. Each edition of the Iliad or Odyssey is a different, as the editors rely on different manuscripts and fragments. The term accuracy reveals a belief in an original uniform text. The manuscripts of the work currently available date to no earlier than the 10th century. These are at the end of a missing thousand-year chain of copies made as each generation of manuscripts disintegrated or were lost or destroyed and these numerous manuscripts are so similar that a single original can be postulated. The time gap in the chain is bridged by the scholia, or notes, on the existing manuscripts, librarian of the Library of Alexandria, he had noticed a wide divergence in the works attributed to Homer, and was trying to restore a more authentic copy. He had collected several manuscripts, which he named, the Sinopic, the one he selected for correction was the koine, which Murray translates as the Vulgate. Aristarchus was known for his selection of material
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Chisholm, Hugh, ed. (1911). "Ball". Encyclopædia Britannica (11th ed.). Cambridge University Press.
Chisholm, Hugh, ed. (1911). "