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Cook, Frederick Albert

(Encyclopedia)Cook, Frederick Albert, 1865–1940, American explorer and physician, b. Sullivan co., N.Y. Cook early became interested in the arctic and accompanied the expedition of Robert E. Peary in 1891–92 as...

sage

(Encyclopedia)sage, any species of the large genus Salvia, aromatic herbs or shrubs of the family Labiatae (mint family). The common sage of herb gardens is S. officinalis, a strongly scented shrubby perennial, nat...

Davis, Sammy, Jr.

(Encyclopedia) Davis, Sammy, Jr. (Samuel George), 1925-1990, American entertainer, b. Harlem, New York City, N.Y. Both of Davis’s parents were dancers who performe...

catecholamine

(Encyclopedia)catecholamine kătˌəkôlˈəmēn [key], any of several compounds occurring naturally in the body that serve as hormones or as neurotransmitters in the sympathetic nervous system. The catecholamines ...

Wavell, Archibald Percival Wavell, 1st Earl

(Encyclopedia)Wavell, Archibald Percival Wavell, 1st Earl wāˈvəl [key], 1883–1950, British field marshal and viceroy of India. Wavell first saw service in the South African War and in India. During World War I...

Ryder, Albert Pinkham

(Encyclopedia)Ryder, Albert Pinkham, 1847–1917, American painter, b. New Bedford, Mass. In 1867 his family moved to New York City. There he studied with W. E. Marshall, the engraver, and at the National Academy o...

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...

microscope

(Encyclopedia)CE5 Compound microscope microscope, optical instrument used to increase the apparent size of an object. The electron microscope, which is not limited by the powers of optical lenses and light,...

Magellanic Clouds

(Encyclopedia)Magellanic Clouds măjˌəlănˈĭk [key], two dwarf galaxies located in the far southern sky and visible to the unaided eye; they are classified as irregular because they show no definite symmetry or...

seasonal affective disorder

(Encyclopedia)seasonal affective disorder (SAD), recurrent fall or winter depression characterized by excessive sleeping, social withdrawal, depression, overeating, and pronounced weight gain. SAD effects an estima...