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Popper, Sir Karl Raimund
(Encyclopedia) Popper, Sir Karl Raimund, 1902–94, Anglo-Austrian philosopher, b. Vienna. He became familiar with the Vienna circle of logical positivists (see logical positivism) while a student at…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…grain, in agriculture
(Encyclopedia) grain, in agriculture, term referring to the caryopsis, or dry fruit, of a cereal grass. The term is also applied to the seedlike fruits of buckwheat and of certain other plants and is…Gran Chaco
(Encyclopedia) Gran ChacoGran Chacogrän chäˈkō [key] or Chaco, c.250,000 sq mi (647,500 sq km), extensive lowland plain, central South America. It is sparsely populated and is divided among Paraguay…peanut
(Encyclopedia) peanut, name for a low, annual leguminous plant (Arachis hypogaea) of the family Leguminosae (pulse family) and for its edible seeds. Native to South America and cultivated there for…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…flax
(Encyclopedia) flax, common name for members of the Linaceae, a family of annual herbs, especially members of the genus Linum, and for the fiber obtained from such plants. The flax of commerce (…water bug
(Encyclopedia) water bug, name for a large number of water-living bugs, comprising several families of the order Hemiptera (true bugs). All have jointed, sharp, sucking beaks, breathe air, and…sea lion
(Encyclopedia) sea lion, fin-footed marine mammal of the eared seal family (Otariidae). Like the other member of this family, the fur seal, the sea lion is distinguished from the true seal by its…saxifrage
(Encyclopedia) saxifragesaxifragesăkˈsĭfrĭj [key], common name for several members of the Saxifragaceae, a family of widely varying herbs, shrubs, and small trees of cosmopolitan distribution. They…Trending
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