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physics
(Encyclopedia)physics, branch of science traditionally defined as the study of matter, energy, and the relation between them; it was called natural philosophy until the late 19th cent. and is still known by this na...Austria
(Encyclopedia)CE5 Austria ôˈstrēə [key], Ger. Österreich [eastern march], officially Republic of Austria, federal republic (2020 est. pop. 8,917,000), 32,374 sq mi (83,849 sq km...opera
(Encyclopedia)opera, drama set to music. In the early part of the 20th cent. the foremost operatic composer was Richard Strauss. Although influenced by Wagner, he composed operas with even richer and more stunnin...Browse by Subject
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