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War Production Board

(Encyclopedia)War Production Board (WPB), former U.S. government agency, established (Jan., 1942) by executive order to direct war production and the procurement of materials in World War II. The chairman (Donald M...

Bothe, Walther Wilhelm Georg

(Encyclopedia)Bothe, Walther Wilhelm Georg, 1891–1957, German physicist, Ph.D. Univ. of Berlin, 1923. Bothe was a researcher at the Reich Physical and Technical Institute (1913–30) and a professor at Heidelberg...

war, laws of

(Encyclopedia)war, laws of, in international law, rules and principles regulating an armed conflict between nations. These laws are designed to minimize the destruction of life and property, to proscribe cruel trea...

ray, in zoology

(Encyclopedia)ray, extremely flat-bodied cartilaginous marine fish, related to the shark. The pectoral fins of most rays are developed into broad, flat, winglike appendages, attached all along the sides of the head...

Myrdal, Alva

(Encyclopedia)Myrdal, Alva älˈvä mĭrˈdäl, Swed. mürˈdäl [key], 1902–86, Swedish sociologist, diplomat, and political leader. As a sociologist in the 1930s, she initiated a national program establishing s...

Titan , in Greek religion and mythology

(Encyclopedia)Titan, in Greek religion and mythology, one of 12 primeval deities. The female Titan is also called Titaness. The Titans—six sons and six daughters—were the children of Uranus and Gaea. They were ...

Hephaestus

(Encyclopedia)Hephaestus hĕfĕsˈtəs [key], in Greek religion and mythology, Olympian god. According to Homer he was the son of Hera and Zeus, but Hesiod states that he was conceived and borne by Hera alone. Orig...

Hajj Umar, al-

(Encyclopedia)Hajj Umar, al- ōˈmär [key], 1797–1864, Muslim religious and military leader in W Africa. A chieftain of the large Tukulor tribe of Senegal, he desired to convert the pagan tribespeople of the W S...

microprocessor

(Encyclopedia)microprocessor, integrated circuit containing the arithmetic, logic, and control circuitry required to interpret and execute instructions from a computer program. When combined with other integrated c...

hunting

(Encyclopedia)hunting, act of seeking, following, and killing wild animals for consumption or display. It differs from fishing in that it involves only land animals. Hunting was a necessary activity of early humans...