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CZ:Featured article
From Citizendium, the Citizens' Compendium
Featured Article is an award given weekly to a high-quality Citizendium article.
Chunbum Park is the current Featured Articles maintainer.
Contents |
Note on editing Featured Articles (8 August 2011)
You are encouraged to fix any errors you find in our Featured Articles. Do note however, that changes made to the current Feature at CZ:Featured article/Current do not automatically apply to the main article. The /Current page is blanked once a week to make room for the next Feature. For your contribution to be permanent, you need to make the change in the main article as well, i.e. the topmost link in the list below. Thank you. Johan Förberg
Formal policy
EC Decision D-2011-014, 28 February 2011:
The welcome page of the Citizendium shall display one or two featured articles.
If no other system of choosing and displaying articles is employed, then at least one article shall be chosen from our Approved articles on a rotating basis and shall thereafter be changed at least once a week.
Remark: This replaces the "Article of the Week" and the "New Draft of the Week" for the time being, or until another feature is installed.
Archive
List of previously featured articles.
Before May 4, 2011, there were two distinct categories of featured articles, which are archived separately.
Featured articles
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Black mamba [r]: A large, highly venemous snake which is the longest venemous snake in its native habitat, Africa. [e] (May 11 — 18, 2012)
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Passive attack [r]: An attack on a communications system in which the attacker reads messages he is not supposed to but does not alter them. [e] (May 5 — 11, 2012)
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Economics [r]: The analysis of the production, distribution, and consumption of goods and services. [e] (April 28 — May 5, 2012)
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Choked flow [r]: A limiting point for the mass flow rate of a gas which occurs under specific conditions when the gas flows through a restriction (such as a valve, a convergent-divergent nozzle, the hole in an orifice plate, or a leak in a gas pipeline or other gas container) into a lower pressure environment. [e] (April 20 — 28, 2012)
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RMS Titanic [r]: British passenger liner that sank on its maiden voyage in 1912 after hitting an iceberg in the Atlantic Ocean; best-known maritime disaster. [e] (April 13 — 20, 2012)
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Karl Marx [r]: 19th century philosopher and economist. Creator of a theoretical foundation for Communism. [e] (April 6 — 13, 2012)
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ASIMO [r]: A Japanese humanoid robot created by Honda. [e] (March 31 — April 6, 2012)
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Associated Legendre function [r]: Function defined by
where Pℓ denotes a Legendre function. [e] (March 23 — 31, 2012)
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The Social Capital Foundation [r]: A Brussels-based NGO promoting social capital and social cohesion. [e] (March 17 — 23, 2012)
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History of economic thought [r]: the historical development of economic thinking. [e] (March 9 — 17, 2012)
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Los Alamos National Laboratory [r]: A U.S. Department of Energy (DOE) national laboratory located in Los Alamos, New Mexico and originally the development and construction center of nuclear weapons during the Manhattan Project for use by the United States in World War II. [e] (March 2 — 9, 2012)
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Diabesity [r]: A term referring to the intricate relationship between type 2 diabetes and obesity. [e] (February 24 — March 2, 2012)
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Electroconvulsive therapy [r]: A psychiatric treatment that involves inducing a seizure in a patient by passing electricity through the brain. [e] (February 18 — 24, 2012)
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International economics [r]: The study of the patterns and consequences of transactions and interactions between the inhabitants of different countries, including trade, investment and migration. [e] (February 10 — 18, 2012)
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The Clash of Civilizations and the Remaking of World Order [r]: A book, by Samuel Huntington, assuming a fundamental conflict between civilizations of different cultures, and discussing grand strategy to deal with this conflict [e] (February 3 — 10, 2012)
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National Institute of Standards and Technology [r]: A measurement standards laboratory which is a non-regulatory agency of the United States Department of Commerce. [e] (January 27 — February 3, 2012)
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Hausdorff dimension [r]: The extended non-negative real exponent associated to any metric space where the Hausdorff measure changes from ∞ to 0. [e] (January 20 — 27, 2012)
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Ideal gas law [r]: Relates pressure, volume and temperature for hypothetical gases of atoms or molecules with negligible intermolecular forces. [e] (January 14 — 20, 2012)
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Volatility (chemistry) [r]: A term used to characterize the tendency of a substance to vaporize. [e] (January 6 — 14, 2012)
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Alcmaeon of Croton [r]: A Greek natural philosopher, living c. 500 BCE, interested in particular in medicine and physiology, credited by scholars as the first person to recognize the brain as the seat of intelligence and mind, whose ideas about the causes of disease prompted or anticipated those of Hippocrates. [e] (December 31, 2011 — January 6, 2012)
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Thomas Jefferson [r]: (1743-1826) Third President of the United States; author of the Declaration of Independence and the Virginia Statute for Religious Freedom; father of the University of Virginia [e] (December 23 — 31, 2011)
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Linguistics [r]: The scientific study of language. [e] (December 17 — 23, 2011)
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Kilt [r]: A knee-length, skirtlike, traditional Scottish garment, usually worn by men as part of Highland attire. [e] (December 9 — 17, 2011)
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Warfarin [r]: Rat poison also used as anticoagulant medication to prevent embolism and thrombosis [e] (December 2 — 9, 2011)
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Global warming [r]: The increase in the average temperature of the Earth's near-surface air and oceans in recent decades and its projected continuation. [e] (November 26 — December 2, 2011)
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Reuben sandwich [r]: Part of American food folklore, a dish made from rye bread, sauerkraut, Swiss cheese and corned beef, although pastrami can be used instead of corned beef. [e] (November 19 — 26, 2011)
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British and American English [r]: A comparison between these two language variants in terms of vocabulary, spelling and pronunciation. [e] (November 12 — 19, 2011)
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Plymouth Colony [r]: English colony in North America, 1620-1691, until it was absorbed by Massachusetts. [e] (November 4 — 12, 2011)
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Arab Spring [r]: Protest movements in the Arab world that seek the removal of oppressive governments. [e] (October 28 — November 4, 2011)
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C (letter) [r]: The third letter of the English and Latin alphabets. [e] (October 22 — 28, 2011)
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Fertility (demography) [r]: The demographic analysis of having babies. [e] (October 14 — 22, 2011)
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Geometric series [r]: A series associated with a geometric sequence, i.e., consecutive terms have a constant ratio. [e] (October 8 — 14, 2011)
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Eurozone crisis [r]: A financial crisis involving member countries of the Eurozone [e] (October 1 — 8, 2011)
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Destroyer [r]: While the definition has evolved constantly, it is a multipurpose surface warship, generally less powerful than a cruiser, with capabilities against ship, aircraft, submarine, land, and sometimes ballistic missile targets [e] (September 26 — October 1, 2011)
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Cypherpunk [r]: People interested in cryptography as a tool for privacy, anonymity and social change. [e] (September 17 — 26, 2011)
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Dirac delta function [r]: Sharply peaked function, generalization of the Kronecker delta; a distribution that maps a regular function onto a single function value. [e] (September 10 — 17, 2011)
- Lockheed SR-71 [r]: Add brief definition or description (September 2 — 10, 2011)
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Clostridium difficile [r]: A bacteria species causing infectious diarhhea and pseudomembranous colitis. [e] (August 25 — September 2, 2011)
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Great Recession [r]: The disruption of economic activity that began with a downturn in 2007 and generated international repercussions that continued through 2011. [e] (August 19 — 25, 2011)
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Alice Bailey [r]: Author of spiritual, occult, esoteric and religious themes; early popularizer of terms New Age and Age of Aquarius. [e] (August 13 — 19, 2011)
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Félix d'Hérelle [r]: (1873 – 1949) - A French-Canadian bacteriologist, and the discoverer of bacteriophages. [e] (August 7 — 13, 2011)
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Miller effect [r]: The increase in the equivalent input capacitance of an inverting voltage amplifier due to a capacitance connected between two gain-related nodes. [e] (July 29 — August 7, 2011)
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Gut-brain signalling [r]: The interaction between the gastrointestinal tract and the brain. [e] (July 23 — 29, 2011)
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Neanderthal [r]: Extinct member of the Homo genus that is known from Pleistocene specimens found in Europe and parts of western and central Asia. [e] (July 13 — 23, 2011)
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Tennis [r]: A sport played on a hard-surfaced rectangular court, between either two players or two teams of two players each, in which the players attempt to strike a hollow rubber ball, using a stringed raquet, over a net into the opponent's half of the court. [e] (July 2 — 13, 2011)
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Apollo program [r]: A human spaceflight program undertaken by NASA during the years 1961–1975 with the goal of conducting manned moon landing missions. [e] (June 26 — July 2, 2011)
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Semiconductor diode [r]: Two-terminal device that conducts current in only one direction, made of two or more layers of material, of which at least one is a semiconductor. [e] (June 17 — 26, 2011)
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Miller effect [r]: The increase in the equivalent input capacitance of an inverting voltage amplifier due to a capacitance connected between two gain-related nodes. [e] (June 11 — 17, 2011)
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Specific heat ratio [r]: The ratio of the specific heat of a gas at constant pressure,
, to the specific heat at constant volume,
, also sometimes called the adiabatic index or the heat capacity ratio or the isentropic expansion factor. [e] (June 3 — 11 2011)
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Macromolecular chemistry [r]: The study of the physical, biological and chemical structure, properties, composition, and reaction mechanisms of macromolecules. [e] (May 27 — June 3, 2011)
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Tecum Umam [r]: Legendary defender of the Maya and national hero of Guatemala. [e] (May 21 — 27, 2011)
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Heterotaxis [r]: A genus of orchids formed by a group of about fourteen large epiphytic neotropical species of small flowers, which previously were considered part of genus Maxillaria. [e] (May 4 — 21, 2011)
Articles of the Week (before May 4, 2011)
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Space (mathematics) [r]: A set with some added structure, which often form a hierarchy, i.e., one space may inherit all the characteristics of a parent space. [e]
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World of Warcraft [r]: An online video game, released by Blizzard Entertainment in 2004. [e]
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Social capital [r]: Productive assets arising out of social relations, such as trust, cooperation, solidarity, social networks of relations and those beliefs, ideologies and institutions that contribute to production of goods. [e]
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Richard Condon [r]: (1915 – 1996) A prolific and popular American political novelist whose satiric works were generally presented in the form of thrillers or semi-thrillers. [e]
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Natural gas [r]: A gas consisting primarily of methane (CH4) which is found as raw natural gas in underground reservoirs, as gas associated with underground reservoirs of petroleum crude oil, as undersea methane hydrates and as coalbed methane in underground coal mines. [e]
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Stairway to Heaven [r]: A 1971 song written and recorded by Led Zeppelin, which became their signature tune and a centrepiece for the group's live performances. [e]
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Cryptography [r]: A field at the intersection of mathematics and computer science that is concerned with the security of information, typically the confidentiality, integrity and authenticity of some message. [e]
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English spellings [r]: Lists and tables of English words, showing pronunciation. [e]
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Folk saint [r]: A deceased person or spirit that is venerated as a saint but who has not been officially canonized by the Church. [e]
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Led Zeppelin [r]: Famous and influential English hard rock and blues group formed in 1968, known for their albums Led Zeppelin IV and Physical Graffiti, and songs 'Stairway to Heaven' and 'Whole Lotta Love'. [e]
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Locality of reference [r]: A commonly observed pattern in memory accesses by a computer program over time. [e]
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Rabbit [r]: Long-eared, short-tailed, burrowing mammals of the family Leporidae of the order Lagomorpha, found in several parts of the world. [e]
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Scarborough Castle [r]: Ruined stone castle on the east coast of Yorkshire, England, begun in mid-twelfth century. [e] (September 3)
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The Clash of Civilizations and the Remaking of World Order [r]: A book, by Samuel Huntington, assuming a fundamental conflict between civilizations of different cultures, and discussing grand strategy to deal with this conflict [e] (August 27)
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Mauna Kea [r]: One of the three main volcanic mountains on Hawaii, the biggest island in the state of Hawaii. [e] (August 20)
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Brute force attack [r]: An attempt to break a cipher by trying all possible keys; long enough keys make this impractical. [e] (August 13)
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Cruiser [r]: While definitions vary with time and doctrine, a large warship capable of acting independently, as a flagship, or a major escort; capabilities include anti-air warfare, anti-surface warfare, anti-submarine warfare, land attack, and possibly ballistic missile defense [e] (August 5)
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The Canterbury Tales [r]: Collection of stories in verse and prose by Geoffrey Chaucer. [e] (July 30)
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Milpa agriculture [r]: A form of swidden agriculture that is practiced in Mesoamerica. Traditionally, a "milpa" plot is planted with maize, beans, and squash. [e] (July 23)
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Domain Name System [r]: The Internet service which translates to and from IP addresses and domain names. [e] (July 16)
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Scuticaria [r]: A genus of orchids, closely related to Bifrenaria, formed by nine showy species of cylindrical leaves, which exist in three isolated areas of South America. [e] (July 9)
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Torture [r]: The infliction of mental or physical pain, for punishment or as an interrogation technique. [e] (July 2)
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Miltonia [r]: An orchid genus formed by nine showy epiphyte species and seven natural hybrids of Brazil, one species reaching Argentina and Paraguay. [e] (June 25)
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Ancient Celtic music [r]: The music and instruments of the ancient Celts until late Antiquity. [e] (June 18)
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Bifrenaria [r]: A genus of orchids formed by circa twenty species of South America, some widely cultivated because of their large and colored flowers; divided in two distinct groups, one with large flowers and short inflorescences and the other with small flowers and long inflorescences. [e] (June 11)
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Halobacterium NRC-1 [r]: A microorganism from the Archaea kingdom perfectly suited for life in highly saline environments giving biologists an ideal specimen for genetic studies. [e] (June 4)
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Animal [r]: A multicellular organism that feeds on other organisms, and is distinguished from plants, fungi, and unicellular organisms. [e] (May 28)
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Coal [r]: A carbon-containing rock formed by the effect of bacteria, heat and pressure on the debris from the decay of ferns, vines, trees and other plants which flourished in swamps millions of years ago. [e] (May 21)
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Johannes Diderik van der Waals [r]: (1837 – 1923) Dutch scientist, proposed the van der Waals equation of state for gases. [e] (May 7)
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Scientific method [r]: The concept of systematic inquiry based on hypotheses and their testing in light of empirical evidence. [e] (Apr 14)
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Korematsu v. United States [r]: A U.S. Supreme Court case, in which the internment of Japanese-Americans was deemed constitutional due to military necessity [e] (Apr 7)
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Orchid [r]: Any plant classified under Orchidaceae, one of the largest plant families and the largest among Monocotyledons. [e] (Mar 31)
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Oliver Cromwell [r]: (1599-1658) English soldier, statesman, and leader of the Puritan revolution, nicknamed "Old Ironsides". [e] (Mar 24)
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Wisconsin v. Yoder [r]: 1972 U.S. Supreme Court decision in which it was held that the constitutional rights of the Amish, under the "free exercise of religion" clause, were violated by the state's compulsory school attendance law. [e] (Mar 17)
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Conventional coal-fired power plant [r]: An industrial plant which produces electricity by burning of coal and air in a steam generator that heats water to produce high pressure steam which then flows through a series of steam turbines that spin an electrical generator to generate electricity. [e] (Mar 10)
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Battle of the Ia Drang [r]: First divisional-scale battle involving helicopter-borne air assault troops, with U.S. forces against those of North Vietnam [e] (Mar 3)
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Ether (physics) [r]: Medium that can carry electromagnetic waves (obsolete) [e] (Feb 24)
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Large-scale trickle filters [r]: One of the processes by which biodegradable substances in wastewaters are biochemically oxidized. [e] (11 Feb)
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Homeopathy [r]: System of alternative medicine involving administration of highly diluted substances with the intention to stimulate the body's natural healing processes; considered implausible and unproven by mainstream science. [e] (28 Jan)
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Microeconomics [r]: A branch of economics that deals with transactions between suppliers and consumers, acting individually or in groups. [e] (14 Jan)
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Speech Recognition [r]: The ability to recognize and understand human speech, especially when done by computers. [e] (26 Nov)
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Mashup [r]: An integrated application created by combining data and services of multiple applications. On the web, "mashup" typically refers to the combining of geographical location information with a service such as Google maps or Microsoft Virtual Earth. [e] (19 Nov)
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Tux [r]: The name of the penguin, official logo and cartoon mascot for the Linux computer operating system. [e] (14 Oct)
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Hydrogen bond [r]: A non-covalent and non-ionic chemical bond involving a hydrogen atom and either Fluorine, Nitrogen, or Oxygen. [e] (7 Oct)
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Lead [r]: Chemical element number 82, a corrosion-resistant, dense, ductile heavy metal known to cause neurological problems. [e] (1 Sept)
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DNA [r]: A macromolecule — chemically, a nucleic acid — that stores genetic information. [e] (8 July)
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Augustin-Louis_Cauchy [r]: (1789 – 1857) prominent French mathematician, one of the pioneers of rigor in mathematics and complex analysis. [e] (1 July)
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Vasco da Gama [r]: Portuguese explorer who established a sea route from Europe to India. [e] (24 June)
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Phosphorus [r]: Chemical element (Z=15) vital to life and widely used in fertilizers, detergents and pesticides. [e] (17 June)
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Crystal Palace [r]: A glass and iron structure built to house the Great Exhibition in Hyde Park, London, in 1851. It was moved and rebuilt on Sydenham Hill in 1854 but was destroyed by fire in 1936. [e] (10 June)
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Gross Domestic Product [r]: Gross Domestic Product (GDP) is a total of the outputs recorded in a country’s national income accounts. [e] (3 June)
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RNA interference [r]: Process that inhibits the flow of genetic information to protein synthesis. [e] (27 May)
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Latino history [r]: History of Hispanics in the U.S., especially those of Mexican origins. [e] (20 May)
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Navy Grog [r]: Rum-based drink. [e] (13 May)
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Systems biology [r]: The study of biological systems as a whole. [e] (6 May)
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Steroid [r]: Hormone group that controls metabolism, catabolism, growth, electrolyte balance and sexual characteristics. [e] (22 Apr)
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Lebanon [r]: a country in the Middle East. It borders Syria to the north and east, Israel to the south, and the Mediterranean Sea to the west. Its official language is Arabic, although French is widely spoken. The capital and largest city of Lebanon is Beirut. [e] (15 Apr)
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Wheat [r]: Grass crop grown worldwide and used in making flour and fermentation for alcohol production. [e] (7 Apr)
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Benjamin Franklin [r]: 1706-1790, American statesman and scientist, based in Philadelphia. [e] (1 Apr)
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Coherer [r]: A type of radio detector, popular in the earliest days of radio development, beginning around 1890. [e] (25 Mar)
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U.S. Civil War [r]: Major war 1861-65 fought over slavery in which the U.S. defeated the secessionist Confederate States of America. [e] (18 Mar)
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Life [r]: Living systems, of which biologists seek the commonalities distinguishing them from nonliving systems. [e] (11 Mar)
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Petroleum refining processes [r]: The chemical engineering processes used in petroleum refining. [e] (4 Mar)
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Shirley Chisholm [r]: The first African-American congresswoman, serving from 1969-1983, representing New York's 12th Congressional District. [e] (20 Feb)
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Telephone Newspaper [r]: A telephone-based news service in the first years after market introduction of the telephone. [e] (4 Feb)
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Wristwatch [r]: Timepiece designed to be worn around the wrist. [e] (28 Jan)
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Korean War of 1592-1598 [r]: Fought on the Korean peninsula from 1592 to 1598 between Japan and the Chinese tributary alliance (Korea, China, Ryukyus, Java, etc.), and resulted in Japanese retreat. [e] (21 Jan)
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Andrew Carnegie [r]: 1835-1919, Scottish-American steel maker, philanthropist and peace activist [e] (11 January 2008)
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Bowling [r]: An indoor sport in which a large, heavy ball is rolled down a lane to hit a cluster of pins. [e] (31 December 2007)
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Architecture [r]: The art and technique of designing and constructing buildings to fulfill both practical and aesthetic purposes. [e] (December 6)
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Civil society [r]: The space for social activity outside the market, state and household; the arena of uncoerced collective action around shared interests, purposes and values. [e] November 29
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Joan of Arc [r]: A French peasant girl (ca. 1412 – 1431) who led her nation's armies during the Hundred Years' War and became a national heroine and saint. [e] (November 22)
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Chemistry [r]: The science of matter, or of the electrical or electrostatical interactions of matter. [e] (November 15)
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Albert Gallatin [r]: 1761-1849, Swiss born American statesman and anthropologist [e] (November 8)
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Prime number [r]: A number that can be evenly divided by exactly two positive whole numbers, namely one and itself. [e] (November 1)
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Tennis [r]: A sport played on a hard-surfaced rectangular court, between either two players or two teams of two players each, in which the players attempt to strike a hollow rubber ball, using a stringed raquet, over a net into the opponent's half of the court. [e] (October 25)
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Rottweiler [r]: A large breed of dog known for its great physical strength and strong protective instinct. [e] (October 18)
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Theodor Lohmann [r]: A 19th century (1831-1905) German administrative lawyer, civil servant and social reformer, second in importance only to Otto von Bismarck in the formation of the German social insurance system. [e] (October 9)
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William Shakespeare [r]: (1564- 1616) English poet and playwright. [e] (October 2)
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Edward I [r]: (1272-1307) English king who conquered Wales and attempted to conquer Scotland. [e] (September 25)
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El Tío [r]: In highland Bolivian folk religion, the spirit owner of the mountain, who is also known as Huari or Supay. [e] (September 18)
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Scotland Yard [r]: The traditional name of the headquarters of the London Metropolitan Police. [e] (September 11)
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Kilt [r]: A knee-length, skirtlike, traditional Scottish garment, usually worn by men as part of Highland attire. [e] (September 4)
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U.S. Electoral College [r]: The indirect election mechanism used to select the president and vice president of the United States [e] (August 28)
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Butler [r]: Manages all affairs of a household and servicing of principals and guests, providing the service themselves and/or hiring and supervising outside contractors, vendors, housekeeping staff, chef, chauffeur, valet, or personal assistant or secretary. [e] (August 21)
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Tony Blair [r]: Former Labour Party politician and Prime Minister of the United Kingdom (1997-2007). [e] (August 14)
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Northwest Passage [r]: Water route connecting the Atlantic and Pacific oceans north of the North American mainland. [e] (August 7)
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Literature [r]: The profession of “letters” (from Latin litteras), and written texts considered as aesthetic and expressive objects. [e] (July 31)
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Biology [r]: The science of life — of complex, self-organizing, information-processing systems living in the past, present or future. [e] (July 25)
New Drafts of the Week (before May 4, 2011)
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Multi-touch interface [r]: Set of interaction techniques which allow computer or mobile users to control graphical user interface with more than one finger at either application or system level. [e]
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NoSQL [r]: A number of non-relational distributed database architectures, usually that store data as key-value pairs. [e]
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Debt [r]: The outcome of an agreement between a person or organisation wishing to make immediate use of resources, and one wishing to defer their use. [e]
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Ellesmere Chaucer manuscript [r]: Early 15th century illuminated manuscript of Geoffrey Chaucer's The Canterbury Tales. [e]
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Ellipse [r]: Planar curve formed by the points whose distances to two given points add up to a given number. [e]
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Aeneid [r]: An epic poem written by Virgil, which depicts the hero Aeneas fleeing from Troy, journeying to Carthage, Sicily, and finally to Italy where after battling, he becomes the precursor of the city of Rome; a monumental work of major significance in Western literature. [e]
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Tall tale [r]: A narrative, song or jest, transmitted orally or in writing, presenting an incredible, boastful or impossible story. [e]
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Plane (geometry) [r]: In elementary geometry, a flat surface that entirely contains all straight lines passing through two of its points. [e]
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Steam [r]: The vapor (or gaseous) phase of water (H2O). [e]
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Wasan [r]: Classical Japanese mathematics that flourished during the Edo Period from the 17th to mid-19th centuries. [e]
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Racism in Australia [r]: The history of racism and restrictive immigration policies in the Commonwealth of Australia. [e]
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Think tank [r]: An organization that presents ideas as expert analysis, the level of objectivity of which varies with the institution, but with an implication of at least some intellectual independence. [e]
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Les Paul [r]: (9 June 1915 – 13 August 2009) American innovator, inventor, musician and songwriter, who was notably a pioneer in the development of the solid-body electric guitar. [e]
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Zionism [r]: The ideology that Jews should form a Jewish state in what is traced as the Biblical area of Palestine; there are many interpretations, including the boundaries of such a state and its criteria for citizenship [e] (September 3)
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Earth's atmosphere [r]: An envelope of gas that surrounds the Earth and extends from the Earth's surface out thousands of kilometres, becoming increasingly thinner (less dense) with distance but always held in place by Earth's gravitational pull. [e] (August 27)
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Joshua Lawrence Chamberlain [r]: U.S. educator deeply bonded to Bowdoin College, from undergraduate to President; American Civil War general and recipient of the Medal of Honor; Governor of Maine [e] (August 20)
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The Sporting Life (album) [r]: A 1994 studio album recorded by Diamanda Galás and John Paul Jones. [e] (August 13}
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The Rolling Stones [r]: Famous and influential English blues rock group formed in 1962, known for their albums Let It Bleed and Sticky Fingers, and songs '(I Can't Get No) Satisfaction' and 'Start Me Up'. [e] (August 5)
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Euler angles [r]: three rotation angles that describe any rotation of a 3-dimensional object. [e] (July 30)
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Chester Nimitz [r]: United States Navy fleet admiral (1885-1966) who was Commander in Chief, Pacific and Pacific Ocean Areas in World War II [e] (July 23)
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Heat [r]: A form of energy that flows spontaneously from hotter to colder bodies that are in thermal contact. [e] (July 16)
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Continuum hypothesis [r]: A statement about the size of the continuum, i.e., the number of elements in the set of real numbers. [e] (July 9)
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Hawaiian alphabet [r]: The form of writing used in the Hawaiian Language [e] (July 2)
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Now and Zen [r]: A 1988 studio album recorded by Robert Plant, with guest contributions from Jimmy Page. [e] (June 25)
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Wrench (tool) [r]: A fastening tool used to tighten or loosen threaded fasteners, with one end that makes firm contact with flat surfaces of the fastener, and the other end providing a means of applying force [e] (June 18)
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Air preheater [r]: Add brief definition or description (June 11)
- 2009 H1N1 influenza virus [r]: Add brief definition or description (June 4)
- Gasoline [r]: Add brief definition or description (21 May)
- John Brock [r]: Add brief definition or description (8 May)
- McGuffey Readers [r]: Add brief definition or description (14 Apr)
- Vector rotation [r]: Add brief definition or description (7 Apr)
- Leptin [r]: Add brief definition or description (31 Mar)
- Kansas v. Crane [r]: Add brief definition or description (24 Mar)
- Punch card [r]: Add brief definition or description (17 Mar)
- Jass–Belote card games [r]: Add brief definition or description (10 Mar)
- Leptotes (orchid) [r]: Add brief definition or description (3 Mar)
- Worm (computers) [r]: Add brief definition or description (24 Feb)
- Joseph Black [r]: Add brief definition or description (11 Feb 2009)
- Sympathetic magic [r]: Add brief definition or description (17 Jan 2009)
- Dien Bien Phu [r]: Add brief definition or description (25 Dec)
- Blade Runner [r]: Add brief definition or description (25 Nov)
- Piquet [r]: Add brief definition or description (18 Nov)
- Crash of 2008 [r]: Add brief definition or description (23 Oct)
- Information Management [r]: Add brief definition or description (31 Aug)
- Battle of Gettysburg [r]: Add brief definition or description (8 July)
- Drugs banned from the Olympics [r]: Add brief definition or description (1 July)
- Sea glass [r]: Add brief definition or description (24 June)
- Dazed and Confused (Led Zeppelin song) [r]: Add brief definition or description (17 June)
- Hirohito [r]: Add brief definition or description (10 June)
- Henry Kissinger [r]: Add brief definition or description (3 June)
- Palatalization [r]: Add brief definition or description (27 May)
- Intelligence on the Korean War [r]: Add brief definition or description (20 May)
- Trinity United Church of Christ, Chicago [r]: Add brief definition or description (13 May)
- BIOS [r]: Add brief definition or description (6 May)
- Miniature Fox Terrier [r]: Add brief definition or description (23 April)
- Joseph II [r]: Add brief definition or description (15 Apr)
- British and American English [r]: Add brief definition or description (7 Apr)
- Count Rumford [r]: Add brief definition or description (1 April)
- Whale meat [r]: Add brief definition or description (25 March)
- Naval guns [r]: Add brief definition or description (18 March)
- Sri Lanka [r]: Add brief definition or description (11 March)
- Led Zeppelin [r]: Add brief definition or description (4 March)
- Martin Luther [r]: Add brief definition or description (20 February)
- Cosmology [r]: Add brief definition or description (4 February)
- Ernest Rutherford [r]: Add brief definition or description(28 January)
- Edinburgh [r]: Add brief definition or description (21 January)
- Russian Revolution of 1905 [r]: Add brief definition or description (8 January 2008)
- Phosphorus [r]: Add brief definition or description (31 December)
- John Tyler [r]: Add brief definition or description (6 December)
- Banana [r]: Add brief definition or description (22 November)
- Augustin-Louis Cauchy [r]: Add brief definition or description (15 November)
- B-17 Flying Fortress (bomber) [r]: Add brief definition or description - 8 November 2007
- Red Sea Urchin [r]: Add brief definition or description - 1 November 2007
- Symphony [r]: Add brief definition or description - 25 October 2007
- Oxygen [r]: Add brief definition or description - 18 October 2007
- Origins and architecture of the Taj Mahal [r]: Add brief definition or description - 11 October 2007
- Fossilization (palaeontology) [r]: Add brief definition or description - 4 October 2007
- Cradle of Humankind [r]: Add brief definition or description - 27 September 2007
- John Adams [r]: Add brief definition or description - 20 September 2007
- Quakers [r]: Add brief definition or description - 13 September 2007
- Scarborough Castle [r]: Add brief definition or description - 6 September 2007
- Jane Addams [r]: Add brief definition or description - 30 August 2007
- Epidemiology [r]: Add brief definition or description - 23 August 2007
- Gay community [r]: Add brief definition or description - 16 August 2007
- Edward I [r]: Add brief definition or description - 9 August 2007