(Encyclopedia) cube, in geometry, regular solid bounded by six equal squares. All adjacent faces of a cube are perpendicular to each other; any one face of a cube may be its base. The dimensions of a…
(Encyclopedia) Kagame, PaulKagame, Paulkägäˈmə [key], 1957–, Rwandan political leader. Kagame was born into a Tutsi family that fled (1960) ethnic violence in Rwanda. Raised in Uganda, he became a…
(Encyclopedia) Ardashir IArdashir Iärdäshērˈ [key] [another form of Artaxerxes], d. 240, king of Persia (226?–240). He overthrew the last Parthian king, Artabanus IV, entered Ctesiphon, and reunited…
(Encyclopedia) Sorel, GeorgesSorel, Georgeszhôrzh [key]Sorel, Georges sôrĕlˈ [key], 1847–1922, French social philosopher. An engineer before he devoted himself to writing, Sorel found in the…
(Encyclopedia) Yang Kuei-feiYang Kuei-feiyäng gwā-fā [key], 719–56, concubine of the T'ang emperor Hsüan-tsung. The most famous beauty in Chinese history, in legend she is said to have captivated the…
(Encyclopedia) Three Mile Island, site of a nuclear power plant 10 mi (16 km) south of Harrisburg, Pa. On Mar. 28, 1979, failure of the cooling system of the No. 2 nuclear reactor led to overheating…
(Encyclopedia) Adolf of NassauAdolf of Nassaunäˈsou [key], d. 1298, duke of Luxembourg, German king (1292–98). He owed his election to the ecclesiastical electors, who, fearing the growing power and…
(Encyclopedia) chain, flexible series of connected links used in various ways, especially for the transmission of motive power, for hoisting (see pulley), and for securing or fastening. Commonly,…
(Encyclopedia) windmill, apparatus that harnesses wind power for a variety of uses, e.g., pumping water, grinding corn, driving small sawmills, and driving electrical generators. Windmills were…
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