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Leonov, Aleksei Arkhipovich
(Encyclopedia)Leonov, Aleksei Arkhipovich ŭlˌyĭksyāˈ ärkhˌyĭpôˈvyĭch [key], 1934–2019, Soviet-Russian cosmonaut and military officer. While serving as copilot of Voskhod 2 (Mar. 18–19, 1964), he beca...hydrogen bomb
(Encyclopedia)hydrogen bomb or H-bomb, weapon deriving a large portion of its energy from the nuclear fusion of hydrogen isotopes. In an atomic bomb, uranium or plutonium is split into lighter elements that togethe...Akrotiri
(Encyclopedia)Akrotiri āˌkrōtēˈrē [key], Akrotiri Sovereign Base Area, or Western Sovereign Base Area, British air force base (2004 est. pop. 6,300), 47 sq mi (123 sq km), located on a peninsula on the SW Cyp...United States
(Encyclopedia) CE5 CE5 CE5 United States, officially United States of America, republic (2015 est. pop. 319,929,000), 3,539,227 sq mi (9,166,598 sq km), North America. The United States is the world's third l...gecko
(Encyclopedia)gecko gĕkˈō [key], small or medium-sized lizard of the family Gekkonidae. Some 1,500 species are distributed throughout the warm regions of the world, mostly in the Old World. Despite folklore to t...army
(Encyclopedia)army, large armed land force, under regular military control, organization, and discipline. With the advent of railroads and, later, highway systems it became possible after the mid-19th cent. to mo...meteorology
(Encyclopedia)meteorology, branch of science that deals with the atmosphere of a planet, particularly that of the earth, the most important application of which is the analysis and prediction of weather. Individual...Magnus, Heinrich Gustav
(Encyclopedia)Magnus, Heinrich Gustav hīnˈrĭkh go͝osˈtäf mägˈno͝os [key], 1802–70, German chemist, physicist, and educator. In 1831 he became lecturer and in 1834 professor of physics and technology at t...Afghanistan War
(Encyclopedia)Afghanistan War, 1978–92, conflict between anti-Communist Muslim Afghan guerrillas (mujahidin) and Afghan government and Soviet forces. The conflict had its origins in the 1978 coup that overthrew A...wrestling
(Encyclopedia)wrestling, sport in which two unarmed opponents grapple with one another. The object is to secure a fall, i.e., cause the opponent to lose balance and fall to the floor, and ultimately to pin the supi...Browse by Subject
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