(Encyclopedia) protactiniumprotactiniumprōˌtăktĭnˈēəm [key], radioactive chemical element; symbol Pa; at. no. 91; mass number of most stable isotope 231; m.p. greater than 1,600℃; b.p. 4,026℃; sp. gr…
(Encyclopedia) Wright brothers, American airplane inventors and aviation pioneers. Orville Wright 1871–1948, was born in Dayton, Ohio, and Wilbur Wright, 1867–1912, near New Castle, Ind. Their…
(Encyclopedia) Fuller, Margaret, 1810–50, American writer, lecturer, and public intellectual, b. Cambridgeport (now part of Cambridge), Mass. She was one of the most influential personalities in the…
Punishing StudentsThe Supreme CourtEducating Our KidsPunishing StudentsTesting for DrugsDealing with Sexual HarassmentLegalizing School Vouchers Schools always struggle with the issue of how…
(Encyclopedia) vacuum, theoretically, space without matter in it. A perfect vacuum has never been obtained; the best human-generated vacuums contain less than 100,000 gas molecules per cc, compared…
Spike Lee
See also Actors African-American Actors Asian American Film & Television Personalities Hispanic-American Film, Television, and Theater Personalities Women Stage and…
