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turbulence
turbulence state of violent or agitated behavior in a fluid. Turbulent behavior is characteristic of systems of large numbers of particles, and its unpredictability and randomness has long thwarted attempts to fully understand it, even with such powerful tools as statistical mechanics . Although m...
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Sir Roger Gilbert Bannister
Sir Roger Gilbert Bannister 1929-, British athlete. On May 6, 1954, at Oxford's Iffley Road track, Bannister, a physician, became the first man to run the mile in less than 4 min, a barrier many experts had long considered unbreakable. His time was 3 min 59.4 sec. Australia's John Landy and New Zea...
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guillemot
guillemot , northern sea bird, genus Cephas, of the auk family. The black guillemot, or trystie, Cephus grylle, is about 13 in. (33 cm) long and is very striking in its breeding plumage, being entirely black from bill to tail except for large white wing patches and bright red legs. In winter i...
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Spithead
Spithead eastern part of the channel between Hampshire, England, and the Isle of Wight. In 1797 a celebrated wartime mutiny occurred in the fleet stationed at Spithead: the crews sent the officers ashore, ran the ships by committee, and won their demands for better wages and working conditions.
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weathering
weathering collective term for the processes by which rock at or near the earth's surface is disintegrated and decomposed by the action of atmospheric agents, water, and living things. Some of these processes are mechanical, e.g., the expansion and contraction caused by sudden, large changes in tem...
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John Phillips Marquand
John Phillips Marquand , 1893-1960, American novelist, b. Wilmington, Del., grad. Harvard, 1915. Most of Marquand's gently satirical novels examine life among the rich and socially prominent of New England. Often they concern people too hidebound by money or tradition to change their lives for the b...
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Benjamin Lundy
Benjamin Lundy 1789-1839, American abolitionist, b. Sussex co., N.J., of Quaker parentage. A pioneer in the antislavery movement, Lundy founded (1815) the Union Humane Society while operating a saddlery in Ohio. He soon began to devote his efforts full time to the abolitionist cause by founding (18...
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Horace Mann
Horace Mann , 1796-1859, American educator, b. Franklin, Mass. He received a sparse preliminary schooling, but succeeded in entering Brown in the sophomore class and graduated with honors in 1819. He studied law, was admitted (1823) to the Massachusetts bar, and practiced in Dedham, Mass., and in Bo...
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Four-H clubs
Four-H clubs or 4-H clubs, organizations for boys and girls from 9 to 19 years of age. The group is part of an educational program designed to improve techniques of agriculture and home economics, promote high ideals of civic responsibility, provide training for community leadership, and foster...
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nail
nail metal pin driven by force applied at one end into pieces of material, usually wood, to join them together. The strength of a nailed joint depends on the properties of the wood, the type and number of nails used, and the type of loads applied to the joint. When the nail is subjected to side loa...
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