Boron Boron () is the chemical element with atomic number 5 and the chemical symbol B. Boron is a trivalent metalloid element which occurs abundantly in the evaporite ores borax and ulexite. Several allotropes of boron exist; amorphous boron is a brown powder, though crystalline boron is black, extremely hard (9.3 on Mohs' scale), and a poor conductor at room temperature. Boron
Declension In linguistics, declension is the occurrence of inflection in nouns, pronouns and adjectives, indicating such features as number (typically singular vs. plural), case (subject, object, and so on), gender, and possession. Declension occurs in a great many of the world's languages, and features very prominently in many European languages, but is much less prominent in English. Declension
Electrical telegraph electrical telegraph is a telegraph that uses electric signals. The electromagnetic telegraph is a device for human-to-human transmission of coded text messages over wire. Electrical_telegraph
Flag A flag is a piece of fabric, often flown from a pole or mast, generally used symbolically for signaling or identification. It is most commonly used to symbolize a country. The term flag is also used to refer to the graphic design employed by a flag, or to its depiction in another medium. Flag
Go Down Moses "Go Down Moses" is an American Negro spiritual. It describes events in the Old Testament of the Bible, specifically Exodus 5Moses to demand the release of the Israelites from bondage in Egypt. The opening verse as published by the Jubilee Singers in 1872 When Israel was in Egypt's land Oppress'd so hard they could not stand, Let my People go. Go down, Moses, Way down in Egypt land, Tell old Pharaoh, Let my people go. Go_Down_Moses
Gunpowder Gunpowder, also called black powder, is an explosive mixture of sulfur, charcoal and potassium nitrate, KNO3 (also known as saltpetre/saltpeter) that burns rapidly, producing volumes of hot solids and gases which can be used as a propellant in firearms and as a pyrotechnic composition in fireworks. Gunpowder
Helium Helium () is the chemical element with atomic number 2, and is represented by the symbol He. It is a colorless, odorless, tasteless, non-toxic, inert monatomic gas that heads the noble gas group in the periodic table. Its boiling and melting points are the lowest among the elements and it exists only as a gas except in extreme conditions.An unknown yellow spectral line signature in sunlight was first observed from a solar eclipse in 1868 by French astronomer Pierre Janssen. Helium
Manganese Manganese () is a chemical element, designated by the symbol Mn. It has the atomic number 25. It is found as a free element in nature (often in combination with iron), and in many minerals. As a free element, manganese is a metal with important industrial metal alloy uses, particularly in stainless steels. Manganese phosphating is used as a treatment for rust and corrosion prevention on steel. Manganese
Mosque A mosque is a place of worship for followers of Islam. Muslims often refer to the mosque by its Arabic name, masjid, — (pl. masājid, — ). The word "mosque" in English refers to all types of buildings dedicated for Islamic worship, although there is a distinction in Arabic between the smaller, privately owned mosque and the larger, "collective" mosque (, masjid jāmi‘), which has more community and social amenities. Mosque
Military history Military history is a humanities discipline within the scope of general historical recording of armed conflict in the history of humanity, and its impact on the societies, their cultures, economies and changing intra and international relationships. A conflict may range from a melee between two tribal groups to conflicts between national militaries, and a world war of coalitions affecting the majority of the global human population. Military_history
Médecins Sans Frontières Médecins Sans Frontières (pronounced ), or Doctors Without Borders, is a secular humanitarian-aid non-governmental organization best known for its projects in war-torn regions and developing countries facing endemic disease. Médecins Sans Frontières was created in 1971 by a small group of French doctors in the aftermath of the Biafra secession, who believed that all people have the right to medical care regardless of race, religion, creed or political affiliation, and that the needs of these people supersede respect for national borders. Médecins_Sans_Frontières
Oliver Heaviside Oliver Heaviside (18 May 1850 self-taught English electrical engineer, mathematician, and physicist who adapted complex numbers to the study of electrical circuits, invented mathematical techniques to the solution of differential equations (later found to be equivalent to Laplace transforms), reformulated Maxwell's field equations in terms of electric and magnetic forces and energy flux, and independently co-formulated vector analysis. Oliver_Heaviside
Protest song protest song is a song which is associated with a movement for social change and hence part of the broader category of topical songs (or songs connected to current events). It may be folk, classical, or commercial in genre. Among social movements that have an associated body of songs are the abolition movement, women's suffrage, the labor movement, civil rights, the anti-war movement, the feminist movement, and Environmentalism. Protest_song
Peter Mark Roget Peter Mark Roget FRS (; January 18, 1779 September 12, 1869) was a British physician, natural theologian and lexicographer. He is best known for publishing, in 1852, the Thesaurus of English Words and Phrases (Roget's Thesaurus), a classified collection of related words. Peter_Mark_Roget
Pelton wheel Pelton wheel is among the most efficient types of water turbines. It was invented by Lester Allan Pelton (1829-1908) in the 1870s, and is an impulse machine, meaning that it uses the principle of Newton's second law to extract energy from a jet of fluid. Although the one-piece cast impulse water turbine was invented by Samuel Knight in Sutter Creek, in the California Mother Lode gold mining region, Pelton modified this invention to create his more efficient design. Knight Foundry is the last water-pow Pelton_wheel
Quasigroup mathematics, especially in abstract algebra, a quasigroup is an algebraic structure resembling a group in the sense that "division" is always possible. Quasigroups differ from groups mainly in that they need not be associative. loop. Quasigroup
Slide rule slide rule, also known colloquially as a slipstick, is a mechanical analog computer. The slide rule is used primarily for multiplication and division, and also for "scientific" functions such as roots, logarithms and trigonometry, but does not generally perform addition or subtraction.Slide rules come in a diverse range of styles and generally appear in a linear or circular form with a standardized set of markings (scales) essential to performing mathematical computations. Slide_rule
Sabotage Distinguish from cabotage (transport of goods or passengers between two points in the same country). Sabotage is a deliberate action aimed at weakening another entity through subversion, obstruction, disruption, and/or destruction. In a workplace setting, sabotage is the conscious withdrawal of efficiency generally directed at causing some change in workplace conditions. One who engages in sabotage is a saboteur. Sabotage
Telecommunication For the song by A Flock of Seagulls, see here.Telecommunication is the assisted transmission over a distance for the purpose of communication. In earlier times, this may have involved the use of smoke signals, drums, semaphore, flags or heliograph. In modern times, telecommunication typically involves the use of electronic devices such as the telephone, television, radio or computer. Telecommunication
Terrorism Terrorism is a policy or ideology of violence intended to intimidate or cause terror for the purpose of "exerting pressure on decision making by state bodies." Terrorism