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isotope

(Encyclopedia)CE5 Isotopes of hydrogen isotope īˈsətōp [key], in chemistry and physics, one of two or more atoms having the same atomic number but differing in atomic weight and mass number. The concept of ...

Grosseteste, Robert

(Encyclopedia)Grosseteste, Robert grōsˈtĕst [key], c.1175–1253, English prelate. Educated at Oxford and probably also at Paris, he became one of the most learned men of his time. He taught at Oxford and later,...

Burns, Robert

(Encyclopedia)Burns, Robert, 1759–96, Scottish poet. Burns's art is at its best in songs such as “Flow Gently, Sweet Afton,” “My Heart's in the Highlands,” and “John Anderson My Jo.” Two collections...

Welles, Orson

(Encyclopedia)Welles, Orson, 1915–85, American actor, director, and producer, b. Kenosha, Wis. From childhood he evinced a precocious talent and lofty sense of self-assurance in theatrical matters. He began actin...

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...

Brecht, Bertolt

(Encyclopedia)Brecht, Bertolt bĕrˈtôlt brĕkht [key], 1898–1956, German dramatist and poet, b. Eugen Berthold Friedrich Brecht. His brilliant wit, his outspoken Marxism, and his revolutionary experiments in th...

Warwick, Richard Neville, earl of

(Encyclopedia)Warwick, Richard Neville, earl of , wŏrˈĭk [key], 1428–71, English nobleman, called the Kingmaker. Through his grandfather, Ralph Neville, 1st earl of Westmorland, he had connections with the hou...

Morris, Mark

(Encyclopedia)Morris, Mark 1956–, American dancer and choreographer, b. Seattle, Wash. After training in Balkan folk dance, flamenco, and ballet, he went on to dance for Eliot Feld, Laura Dean, and Lar Lubovitch....

Lollardry

(Encyclopedia)Lollardry lŏlˈyo͝ordrē [key] or Lollardy, medieval English movement for ecclesiastical reform, led by John Wyclif, whose “poor priests” spread his ideas about the countryside in the late 14th ...

Russell

(Encyclopedia)Russell, English noble family. It first appeared prominently in the reign of Henry VIII when John Russell, 1st earl of Bedford, 1486?–1555, rose to military and diplomatic importance. He was lord hi...