| Autism | ICD9 = 299.0 Autism
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| Albedo The albedo of an object is the extent to which it diffusely reflects light from the sun. It is therefore a more specific form of the term reflectivity. Albedo
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| Altruism Altruism is selfless concern for the welfare of others. It is a traditional virtue in many cultures, and central to many religious traditions. Altruism
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| Android An android is a robot designed to resemble a human, usually both in appearance and behavior. The word derives from ανδρός, the genitive of the Greek ανήρ anēr, meaning "man", and the suffix -eides, used to mean "of the species; alike" (from eidos, "species"). Android
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| Albert Einstein | birth_place = Ulm, Württemberg, Germany Albert_Einstein
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| Amateur astronomy Amateur astronomy, a subset of astronomy, is a hobby whose participants enjoy studying and observing celestial objects. Amateur_astronomy
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| Asteroid Asteroids, sometimes called minor planets or planetoids, are bodies—primarily of the inner Solar System—that are smaller than planets but larger than meteoroids (commonly defined as being 10 meters across or less), with the exception of comets. The distinction between asteroids and comets is made on visual appearance when discovered: Comets show a perceptible coma (a fuzzy "atmosphere"), while asteroids do not. Asteroid
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| Attila the Hun Attila (406 – 453), also known as Attila the Hun or the Scourge of God, was leader of the Huns from 434 until his death. He was leader of the Hunnic Empire which stretched from Germany to the Ural River and from the River Danube to the Baltic Sea (see map below). Attila_the_Hun
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| Atom |- Atom
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| Ammonia | Section2 = Ammonia
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| Algol Database entry for Algol A, SIMBAD. Accessed online February 9, 2008. Algol
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| Archimedes Archimedes of Syracuse (Greek: He used the method of exhaustion to calculate the area under the arc of a parabola with the summation of an infinite series, and gave a remarkably accurate approximation of Pi. He also defined the spiral bearing his name, formulas for the volumes of surfaces of revolution and an ingenious system for expressing very large numbers. Archimedes
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| Andreas Capellanus Andreas Capellanus (Capellanus meaning "chaplain") was the twelfth century author of a treatise commonly entitled De amore ("About Love"), and often known in English, somewhat misleadingly, as The Art of Courtly Love, though its realistic, somewhat cynical tone suggests that it is in some measure an antidote to courtly love. Nothing is known of Andreas Capellanus's life, but he is presumed to have been a courtier of Marie of Troyes, and probably of French origin; he is sometimes known by a French translation of his name, André le Chapelain. Andreas_Capellanus
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| Apparent magnitude The apparent magnitude (m) of a celestial body is a measure of its brightness as seen by an observer on Earth, normalized to the value it would have in the absence of the atmosphere. The brighter the object appears, the lower the value of its magnitude. Apparent_magnitude
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| Absolute magnitude In astronomy, absolute magnitude (also known as absolute visual magnitude) is the apparent magnitude an object would have if it were at a standard luminosity distance (10 parsecs, 1 AU, or 100 km depending on object type) away from the observer, in the absence of astronomical extinction. It allows the overall brightnesses of objects to be compared without regard to distance. Absolute_magnitude
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| Alpha Centauri /B Alpha_Centauri
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| American and British English differences This is one of a series of articles about the differences between American English and British English, which, for the purposes of these articles, are defined as follows: American_and_British_English_differences
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| Arthur Stanley Eddington |death_date = Arthur_Stanley_Eddington
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| Analog computer An analog computer (spelt analogue in British English) is a form of computer that uses continuous physical phenomena such as electrical,Universiteit van Amsterdam Computer Museum, (2007) mechanical, or hydraulic quantities to model the problem being solved. Analog_computer
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| Adrastea (moon) |discovered = July 8, 1979 Adrastea_(moon)
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| Andrei Sakharov |birth_place = Moscow, USSR Andrei_Sakharov
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| Anthropic principle In physics and cosmology, the anthropic principle states that humans should take into account the constraints that human existence imposes on the kind of theoretical universe that can support human life. Our human understanding dictates that the only kind of universe we can occupy is one that is similar to the one we are in. Anthropic_principle
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| Anthropic principle Talk:Anthropic_principle
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| Archaeopteryx Late Jurassic Archaeopteryx
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| Aldebaran Aldebaran ( α Tau, α Tauri, Alpha Tauri) is the brightest star in the constellation Taurus and one of the brightest stars in the nighttime sky. Because of its location in the head of Taurus, it has historically been called the Bull's Eye. Aldebaran
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| Altair Altair (α Aql / α Aquilae / Alpha Aquilae / Atair) is the brightest star in the constellation Aquila and the twelfth brightest star in the nighttime sky, at visual magnitude 0.77. Altair
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| Arianespace | parent = Arianespace
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| Aryan Aryan is an English word derived from the Sanskrit "Ārya" meaning "noble" or "honorable".<Dictionary. Aryan
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| Authoritarianism Authoritarianism describes a form of government characterized by an emphasis on the authority of the state in a republic or union. Authoritarianism
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| Belgium Royaume de Belgique Königreich Belgien Belgium
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| Basque language SpainFrance Basque_language
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| Blood Blood is a specialized bodily fluid that delivers necessary substances to the body's cells—such as nutrients and oxygen—and transports waste products away from those same cells. Blood
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| BPP In complexity theory, BPP is the class of decision problems solvable by a probabilistic Turing machine in polynomial time, with an error probability of at most 1/3 for all instances. The abbreviation BPP refers to Bounded-error, Probabilistic, Polynomial time. BPP
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| Big Bang The Big Bang is the cosmological model of the universe that is best supported by all lines of scientific evidence and observation. As used by scientists, the term Big Bang generally refers to the idea that the universe has expanded from a primordial hot and dense initial condition at some finite time in the past, and continues to expand to this day. Big_Bang
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| Barnard's Star | dec = Barnard's_Star
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| Boston, Massachusetts The Hub (of the Universe),1 The Cradle of Liberty, Title Town, The Cradle of Modern America, Athens of America, The Walking City Boston,_Massachusetts
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| Bose–Einstein condensate A Bose–Einstein condensate (BEC) is a state of matter of bosons confined in an external potential and cooled to temperatures very near to absolute zero (, , or ). Under such supercooled conditions, a large fraction of the atoms collapse into the lowest quantum state of the external potential, at which point quantum effects become apparent on a macroscopic scale. Bose–Einstein_condensate
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| Black hole A black hole is a theoretical region of space in which the gravitational field is so powerful that nothing, not even electromagnetic radiation (e.g. Black_hole
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| Brahui language The Brahui (Urdu spelling: بروہی) or Bravi (براوِ) language, spoken by the Brahui, is a Dravidian language mainly spoken in Pakistan, although it is also spoken in Afghanistan and Iran. The 2005 edition of Ethnologue reports some 2. Brahui_language
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| Basque language Talk:Basque_language
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| Background radiation Background radiation is the ionizing radiation emitted from a variety of natural and artificial radiation sources. Primary contributions come from: Background_radiation
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| Creationism Creationism is the religious belief that humanity, life, the Earth, and the universe were created in their original form by a deity (often the Abrahamic God of Judaism, Christianity and Islam) or deities. Creationism
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| Cobalt Cobalt () is a hard, lustrous, silver-grey metal, a chemical element with symbol Co. It is found in various ores, and is used in the preparation of magnetic, wear-resistant, and high-strength alloys. Cobalt
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| Cambridge, Massachusetts Cambridge, Massachusetts is a city in the Greater Boston area of Massachusetts, United States. It was named in honor of the University of Cambridge in England. Cambridge,_Massachusetts
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| Community In biological terms, a community is a group of interacting organisms sharing an environment. In human communities, intent, belief, resources, preferences, needs, risks, and a number of other conditions may be present and common, affecting the identity of the participants and their degree of cohesiveness. Community
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| Comet A comet is a small Solar System body that orbits the Sun and, when close enough to the Sun, exhibits a visible coma (atmosphere) or a tail — both primarily from the effects of solar radiation upon the comet's nucleus. Comet nuclei are themselves loose collections of ice, dust and small rocky particles, measuring a few kilometres or tens of kilometres across. Comet
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| Continental drift Continental drift is the movement of the Earth's continents relative to each other. The hypothesis that continents 'drift' was first put forward by Abraham Ortelius in 1596 and was fully developed by Alfred Wegener in 1912. Continental_drift
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| CNO cycle The CNO cycle (for carbon-nitrogen-oxygen), or sometimes Bethe-Weizsäcker-cycle, is one of two sets of fusion reactions by which stars convert hydrogen to helium, the other being the proton-proton chain. Theoretical models show that the CNO cycle is the dominant source of energy in stars heavier than the sun. CNO_cycle
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| Common Era Common Era (also known as Christian Era and Current Era; Common_Era
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| Carl Friedrich Gauss |birth_place = Braunschweig, Electorate of Brunswick-Lüneburg, Holy Roman Empire Carl_Friedrich_Gauss
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