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space-time
(Encyclopedia)space-time, central concept in the theory of relativity that replaces the earlier concepts of space and time as separate absolute entities. In relativity one cannot uniquely distinguish space and time...Tennessee, river, United States
(Encyclopedia)Tennessee, river, c.650 mi (1,050 km) long, the principal tributary of the Ohio River. It is formed by the confluence of the Holston and French Broad rivers near Knoxville, Tenn., and follows a U-shap...Indian Affairs, Bureau of
(Encyclopedia)Indian Affairs, Bureau of, created (1824) in the U.S. War Dept. and transferred (1849) to the U.S. Dept. of the Interior. The War Dept. managed Native American affairs after 1789, but a separate burea...Aaron, Hank
(Encyclopedia)Aaron, Hank (Henry Louis Aaron), 1934–2021, U.S. baseball player, b. Mobile, Ala. A durable outfielder and consistent hitter noted for his powerful wrists and explosive swing, Aaron joined the Negro...Ohio Company of Associates
(Encyclopedia)Ohio Company of Associates, organization for the purchase and settlement of lands on the Ohio River, founded at Boston in 1786. Its organizers were a group of New England men, most of them former Amer...Ordinance of 1787
(Encyclopedia)Ordinance of 1787, adopted by the Congress of Confederation for the government of the Western territories ceded to the United States by the states. It created the Northwest Territory and is frequently...Irwin, Robert
(Encyclopedia)Irwin, Robert, 1928–, American painter and sculptor, b. Long Beach, Calif. Irwin was one of the founders of the California-based Light and Space movement. Early in his career, he painted in the abst...Porter, David
(Encyclopedia)Porter, David, 1780–1843, American naval officer, b. Boston. Appointed a midshipman in 1798, he served in the West Indies and in the war with Tripoli. In 1803 his ship, the Philadelphia, was capture...Thorpe, Jim
(Encyclopedia)Thorpe, Jim (James Francis Thorpe), 1888–1953, American athlete, b. near Prague, Okla. Thorpe was probably the greatest all-round male athlete the United States has ever produced. His mother, a Sac,...Persepolis
(Encyclopedia)Persepolis pərsĕpˈəlĭs [key] [Gr.,=city of Persia], ancient city of Persia, ceremonial capital of the Achaemenid empire under Darius I and his successors. The administrative capitals were elsewhe...Browse by Subject
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