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Black Friday

(Encyclopedia)Black Friday, Sept. 24, 1869, in U.S. history, day of financial panic. In 1869 a small group of American financial speculators, including Jay Gould and James Fisk, sought the support of federal offici...

Turing test

(Encyclopedia)Turing test, a procedure to test whether a computer is capable of humanlike thought. As proposed (1950) by the British mathematician Alan Turing, a person (the interrogator) sits with a teletype machi...

Fort Niagara

(Encyclopedia)Fort Niagara, post on the southern shore of Lake Ontario, at the mouth of the Niagara River, NW N.Y. It was strategically located on the water route to the fur lands. French explorer Robert LaSalle er...

toucan

(Encyclopedia)toucan to͞okănˈ, to͞oˈkän [key], perching bird of the New World tropics, related to the woodpeckers. Toucans vary in size from the jay-sized toucanets to the 24-in. (62-cm) tocos of the Amazon b...

Eccles, Sir John Carew

(Encyclopedia)Eccles, Sir John Carew kârˈē, ĕkˈəlz [key], 1903–97, Australian neurophysiologist. He was educated at the Univ. of Melbourne and at Magdalene College, Oxford. He was director (1937–44) of th...

Milne, A. A.

(Encyclopedia)Milne, A. A. (Alan Alexander Milne) mĭln, mĭl [key], 1882–1956, English author. Milne began his literary career as a journalist and later became a regular contributor to Punch. He is best known fo...

Kantrowitz, Adrian

(Encyclopedia)Kantrowitz, Adrian kănˈtrəwĭtsˌ [key], 1918–2008, American surgeon, b. New York City, grad. New York Univ. (1940). The son of a physician, Kantrowitz received his M.D. from the Long Island Coll...

Turing machine

(Encyclopedia)Turing machine, a mathematical model of a device that computes via a series of discrete steps and is not limited in use by a fixed maximum amount of data storage. Introduced by the British mathematici...

Martinson, Harry

(Encyclopedia)Martinson, Harry, 1904–78, Swedish writer. Orphaned early, Martinson was self-educated. His works reveal his appreciation of nature and his distrust of modern technological society. He is best known...