Columbia Encyclopedia

(Encyclopedia) Agrippina the Younger, d. a.d. 59, Roman matron; daughter of Germanicus Caesar and Agrippina the Elder. By her first husband, Cneius Domitius Ahenobarbus, she was the mother of Nero. After her brother...

(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 cube are the le...

(Encyclopedia) Kagame, Paul kägäˈmə [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 member of Yoweri Museve...

(Encyclopedia) Ardashir I ärdäshērˈ [key] [another form of Artaxerxes], d. 240, king of Persia (226?–240). He overthrew the last Parthian king, Artabanus IV, entered Ctesiphon, and reunited Persia out of the c...

(Encyclopedia) Sorel, Georges sôrĕlˈ [key], 1847–1922, French social philosopher. An engineer before he devoted himself to writing, Sorel found in the political and social life of bourgeois democracy the trium...

(Encyclopedia) Yang Kuei-fei yäng 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 emperor who then negl...

(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 and partial melt...

(Encyclopedia) Togo, Heihachiro hāˈhächĭrōˈ tōˈgō [key], 1846–1934, Japanese admiral, Japan's greatest naval hero. He studied naval science in England (1871–78), gained international recognition for his...

(Encyclopedia) Adolf of Nassau näˈsou [key], d. 1298, duke of Luxembourg, German king (1292–98). He owed his election to the ecclesiastical electors, who, fearing the growing power and ambition of the Hapsburgs,...

(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, mechanical energy f...