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Akkadian
(Encyclopedia)Akkadian əkāˈdēən [key], extinct language belonging to the East Semitic subdivision of the Semitic subfamily of the Afroasiatic family of languages (see Afroasiatic languages). Also called Assyro...Philadelphia Orchestra
(Encyclopedia)Philadelphia Orchestra, founded 1900 by Fritz Scheel, who was its conductor until his death in 1907. Scheel was followed by Karl Pohlig (1907–12). Under the leadership (1912–38) of Leopold Stokows...actinium
(Encyclopedia)actinium ăktĭnˈēəm [key] [Gr.,=like a ray], radioactive chemical element; symbol Ac; at. no. 89; mass number of most stable isotope 227; m.p. about 1,050℃; b.p. 3,200℃±300℃; sp. gr. 10.07;...Krupp
(Encyclopedia)Krupp kro͝op [key], family of German armament manufacturers. The family settled in Essen in the 16th cent. The core of the great Krupp industrial empire was started by Friedrich Krupp, 1787–1826, w...Polybius
(Encyclopedia)Polybius pōlĭˈbēəs [key], 203? b.c.–c.120 b.c., Greek historian, b. Megalopolis. As one of the leaders of the Achaean League and a friend of Philopoemen, he was influential in Greek politics. H...syphilis
(Encyclopedia)syphilis sĭfˈəlĭs [key], contagious sexually transmitted disease caused by the spirochete Treponema pallidum (described by Fritz Schaudinn and Erich Hoffmann in 1905). Syphilis was not widely reco...atomic bomb
(Encyclopedia)atomic bomb or A-bomb, weapon deriving its explosive force from the release of nuclear energy through the fission (splitting) of heavy atomic nuclei. The first atomic bomb was produced at the Los Alam...supernova
(Encyclopedia)supernova, a massive star in the latter stages of stellar evolution that suddenly contracts and then explodes, increasing its energy output as much as a billionfold. Supernovas are the principal distr...jet propulsion
(Encyclopedia)CE5 Types of jet engines: In the propeller-driven turbine a stream of high-velocity gases provides the power to drive the turbine and turn the propeller. In the jet-driven turbine the stream of gas...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...Browse by Subject
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