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chain reaction
(Encyclopedia) CE5 Chain reaction: A neutron (n) strikes the uranium nucleus (U-235), causing it to split into fission products A and B and release two neutrons. These neutrons can in turn cause…spring, in geology
(Encyclopedia) spring, in geology, natural flow of water from the ground or from rocks, representing an outlet for the water that has accumulated in permeable rock strata underground. Some of the…etching
(Encyclopedia) etching, the art of engraving with acid on metal; also the print taken from the metal plate so engraved. In hard-ground etching the plate, usually of copper or zinc, is given a thin…embryo screening
(Encyclopedia) embryo screening, procedure (see genetic testing) in which a single cell is removed from an embryo two or three days after it has been conceived through in vitro fertilization and…covenant
(Encyclopedia) covenantcovenantkŭvˈənənt [key], agreement entered into voluntarily by two or more parties to do or refrain from doing certain acts. In the Bible and in theology the covenant is the…license
(Encyclopedia) license, in public law, permission by legal authority to engage in certain acts and also the document showing such permission. Some licenses are required for the protection of the…Allais, Maurice Félix Charles
(Encyclopedia) Allais, Maurice Félix CharlesAllais, Maurice Félix Charlesmôrēsˈ shärl älĕˈ [key], 1911–2010, French economist, Ph.D. Univ. of Paris, 1949. After working in the French mine…Hastings, city, England
(Encyclopedia) Hastings, city and district, East Sussex, SE England. A resort and residential city, Hastings is backed by cliffs and has a 3-mi (4.8-km…half-life
(Encyclopedia) half-life, measure of the average lifetime of a radioactive substance (see radioactivity) or an unstable subatomic particle. One half-life is the time required for one half of any…jatropha
(Encyclopedia) jatrophajatrophajăˈtrəfə [key], any plant of a widely distributed genus (Japtropha) of perennial herbs, shrubs, and trees in the family Euphorbiaceae (spurge family), native to…Trending
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