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Alexander I, czar of Russia
(Encyclopedia)Alexander I, 1777–1825, czar of Russia (1801–25), son of Paul I (in whose murder he may have taken an indirect part). In the first years of his reign the liberalism of his Swiss tutor, Frédéric ...differential geometry
(Encyclopedia)differential geometry, branch of geometry in which the concepts of the calculus are applied to curves, surfaces, and other geometric entities. The approach in classical differential geometry involves ...Reagan, Ronald Wilson
(Encyclopedia)Reagan, Ronald Wilson rāˈgən [key], 1911–2004, 40th president of the United States (1981–89), b. Tampico, Ill. In 1932, after graduation from Eureka College, he became a radio announcer and spo...organ
(Encyclopedia) CE5 Organ organ, a musical wind instrument in which sound is produced by one or more sets of pipes controlled by a keyboard, each pipe producing only one pitch by means of a mechanically produced ...Fronde
(Encyclopedia)Fronde frôNd [key], 1648–53, series of outbreaks during the minority of King Louis XIV, caused by the efforts of the Parlement of Paris (the chief judiciary body) to limit the growing authority of ...science fiction
(Encyclopedia)science fiction, literary genre in which a background of science or pseudoscience is an integral part of the story. Although science fiction is a form of fantastic literature, many of the events recou...education
(Encyclopedia)education, any process, either formal or informal, that shapes the potential of a maturing organism. Informal education results from the constant effect of environment, and its strength in shaping val...Frederick II, king of Prussia
(Encyclopedia)Frederick II or Frederick the Great, 1712–86, king of Prussia (1740–86), son and successor of Frederick William I. Frederick was tolerant in religious matters, personally professing atheism to h...pacifism
(Encyclopedia)pacifism, advocacy of opposition to war through individual or collective action against militarism. Although complete, enduring peace is the goal of all pacifism, the methods of achieving it differ. S...mystery
(Encyclopedia)mystery or mystery story, literary genre in which the cause (or causes) of a mysterious happening, often a crime, is gradually revealed by the hero or heroine; this is accomplished through a mixture o...Browse by Subject
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