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Archimedes' screw
(Encyclopedia)Archimedes' screw, a simple mechanical device believed to have been invented by Archimedes in the 3d cent. b.c. It consists of a cylinder inside of which a continuous screw, extending the length of th...U-2 incident
(Encyclopedia)U-2 incident, in U.S. and Soviet history, the events following the Soviet downing of an American U-2 high altitude reconnaissance aircraft over Soviet territory on May 1, 1960. The incident led to the...chord, in music
(Encyclopedia)chord, in music, two or more simultaneously sounding pitches. In tonal music the fundamental chord is called the triad. It consists of three pitches, two a perfect fifth apart and a third pitch a majo...ode
(Encyclopedia)ode, elaborate and stately lyric poem of some length. The ode dates back to the Greek choral songs that were sung and danced at public events and celebrations. The Greek odes of Pindar, which were mod...Thierry, Augustin
(Encyclopedia)Thierry, Augustin ōgüstăNˈ tyĕrēˈ [key], 1795–1856, French historian. His vivid literary style, romantic treatment of events, and use of contemporary documents helped to create interest in hi...drill, tool
(Encyclopedia)drill, tool used to create a hole, usually in some hard substance, by its rotary or hammering action. Many different tools make up the drill family. The awl is a pointed instrument used for piercing s...probability
(Encyclopedia)probability, in mathematics, assignment of a number as a measure of the “chance” that a given event will occur. There are certain important restrictions on such a probability measure. In any exper...Berryessa Snow Mountain National Monument
(Encyclopedia)Berryessa Snow Mountain National Monument, 330,780 acres (133,860 hectares), N Calif., est. 2015. Jointly managed by Forest Service and Bureau of Land Management, the monument extends from near sea le...Kretschmer, Ernest
(Encyclopedia)Kretschmer, Ernest krĕchˈmər [key], 1888–1964, German psychiatrist, educated at Tübingen, Hamburg, and Münich (M.D., 1913). He served as director of the neurological clinic of the Univ. of Marb...type
(Encyclopedia)type, for printing, was invented in China (c.1040), using woodblocks. Related devices, such as seals and stamps for making impressions in clay, had been used in ancient times in Babylon and elsewhere....Browse by Subject
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