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international date line
(Encyclopedia)international date line, imaginary line on the earth's surface, generally following the 180° meridian of longitude, where, by international agreement, travelers change dates. Traveling eastward acros...tachyon
(Encyclopedia)tachyon tăkˈēŏnˌ [key], hypothetical elementary particle that travels only at speeds exceeding that of light. According to the theory of relativity, the speed of light is the limiting velocity fo...Redgrave
(Encyclopedia)Redgrave, family of English actors. Sir Michael Redgrave, 1908–85, b. Bristol, Eng., was an actor, director, and writer. After his first professional performance in Counsellor-at-Law (1934), he appe...Herrick, Robert, English poet
(Encyclopedia)Herrick, Robert, 1591–1674, English poet, generally considered the greatest of the Cavalier poets. Although he was born in London, he spent most of his childhood in Hampton. In 1607 he became appren...stealth technology
(Encyclopedia)stealth technology, designs and materials engineered for the military purpose of avoiding detection by radar or any other electronic system. Stealth, or antidetection, technology is applied to vehicle...equatorial coordinate system
(Encyclopedia)CE5 Equatorial coordinate system equatorial coordinate system, the most commonly used astronomical coordinate system for indicating the positions of stars or other celestial objects on the celesti...man, in anthropology and biology
(Encyclopedia)man: see anthropology; human evolution; race. ...Geber, Arab alchemist and physician
(Encyclopedia)Geber: see Jabir.Centers for Disease Control and Prevention
(Encyclopedia)Centers for Disease Control and Prevention (CDC), agency of the U.S. Public Health Service since 1973, with headquarters in Atlanta; it was established in 1946 as the Communicable Disease Center. The ...Chateaubriand, François René, vicomte de
(Encyclopedia)Chateaubriand, François René, vicomte de fräNswäˈ rənāˈ vēkôNtˈ də shätōbrēäNˈ [key], 1768–1848, French writer. Chateaubriand was a founder of romanticism in French literature. Of n...Browse by Subject
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