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Crenshaw, Kimberlé Williams

(Encyclopedia)Crenshaw, Kimberlé, 1959–, American legal scholar and critical race theorist, b. Canton, Ohio, J.D. Harvard University, 1984. An influential writer o...

National Aeronautics and Space Administration

(Encyclopedia)National Aeronautics and Space Administration (NASA), civilian agency of the U.S. federal government with the mission of conducting research and developing operational programs in the areas of space e...

Bohr, Niels Henrik David

(Encyclopedia)Bohr, Niels Henrik David bōr [key], 1885–1962, Danish physicist, one of the foremost scientists of modern physics. He studied at the Univ. of Copenhagen (Ph.D. 1911) and carried on research on the...

Abbasid

(Encyclopedia)Abbasid –sīd, –sĭd [key], Arab family descended from Abbas, the uncle of Muhammad. The Abbasids held the caliphate from 749 to 1258, but they were recognized neither in Spain nor (after 787) W o...

plutonium

(Encyclopedia)plutonium plo͞otōˈnēəm [key], radioactive chemical element; symbol Pu; at. no. 94; mass no. of most stable isotope 244; m.p. 641℃; b.p. 3,232℃; sp. gr. 19.84 at 20℃; valence +3, +4, +5, or ...

Salisbury, Robert Arthur Talbot Gascoyne-Cecil, 3d marquess of

(Encyclopedia)Salisbury, Robert Arthur Talbot Gascoyne-Cecil, 3d marquess of sôlzˈbərē [key], 1830–1903, British statesman. He entered Parliament in 1853 as a Conservative and devoted himself for 50 years to ...

oratory

(Encyclopedia)oratory, the art of swaying an audience by eloquent speech. In ancient Greece and Rome oratory was included under the term rhetoric, which meant the art of composing as well as delivering a speech. Or...

modern dance

(Encyclopedia)modern dance, serious theatrical dance forms that are distinct from both ballet and the show dancing of the musical comedy or variety stage. By the late 20th cent., distinctions among modern da...

Harvard University

(Encyclopedia)Harvard University, mainly at Cambridge, Mass., including Harvard College, the oldest American college. From two distinct schools, Radcliffe College for women (est. 1879, chartered 1894) and Harvar...

Great Depression

(Encyclopedia)Great Depression, in U.S. history, the severe economic crisis generally considered to have been precipitated by the U.S. stock-market crash of 1929. Although it shared the basic characteristics of oth...