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tide

(Encyclopedia)tide, alternate and regular rise and fall of sea level in oceans and other large bodies of water. These changes are caused by the gravitational attraction of the moon and, to a lesser extent, of the s...

plastic

(Encyclopedia)plastic, any organic material with the ability to flow into a desired shape when heat and pressure are applied to it and to retain the shape when they are withdrawn. The first important plastic, cel...

influenza

(Encyclopedia)influenza or flu, acute, highly contagious disease caused by a RNA virus (family Orthomyxoviridae); formerly known as the grippe. There are three types of the virus, designated A, B, and C, but only t...

Beethoven, Ludwig van

(Encyclopedia)Beethoven, Ludwig van lŭdˈwĭg văn bāˈtōvən, Ger. lo͝otˈvĭkh fän bātˈhōfən [key], 1770–1827, German composer. He is universally recognized as one of the greatest composers of the West...

artificial intelligence

(Encyclopedia)artificial intelligence (AI), the use of computers to model the behavioral aspects of human reasoning and learning. Research in AI is concentrated in some half-dozen areas. In problem solving, one mus...

evolution

(Encyclopedia)CE5 Plant and animal evolution [Modified from Alfred Gunderson in Brooklyn Botanic Garden Leaflets, Ser. 18, No. 4 (1930); used by permission.] evolution, concept that embodies the belief that ex...

Lee, Robert Edward

(Encyclopedia)Lee, Robert Edward, 1807–70, general in chief of the Confederate armies in the American Civil War, b. Jan. 19, 1807, at Stratford, Westmoreland co., Va.; son of Henry (“Light-Horse Harry”) Lee. ...

criticism

(Encyclopedia)criticism, the interpretation and evaluation of literature and the arts. It exists in a variety of literary forms: dialogues (Plato, John Dryden), verse (Horace, Alexander Pope), letters (John Keats),...

Vienna, city and province, Austria

(Encyclopedia)Vienna vēĕnˈə [key], Ger. Wien, city and province (1991 pop. 1,539,848), 160 sq mi (414 sq km), capital and largest city of Austria and administrative seat of Lower Austria, NE Austria, on the Dan...

New York, state, United States

(Encyclopedia)CE5 New York, Middle Atlantic state of the United States. It is bordered by Vermont, Massachusetts, Connecticut, and the Atlantic Ocean (E), New Jersey and Pennsylvania (S), Lakes Erie and Ontario ...