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Platte

(Encyclopedia)Platte, river, c.310 mi (500 km) long, formed by the confluence of the North Platte (680 mi/1,090 km long) and South Platte (430 m/690 km) rivers at North Platte, Neb. It flows generally E across S Ne...

electric and magnetic units

(Encyclopedia)electric and magnetic units, units used to express the magnitudes of various quantities in electricity and magnetism. Three systems of such units, all based on the metric system, are commonly used. On...

Jonathan, Goodluck Ebele

(Encyclopedia)Jonathan, Goodluck Ebele, 1957–, Nigerian politician, president of Nigeria (2010–). An Ijaw from the Niger delta region, he was educated as a zoologist (Ph.D. Univ. of Port Harcourt, 1995) and wor...

Girard, Stephen

(Encyclopedia)Girard, Stephen jĭrärdˈ [key], 1750–1831, American merchant, banker, and philanthropist, b. Bordeaux, France. Girard went to sea and at the age of 23 was a captain. In 1776 he settled in Philadel...

information storage and retrieval

(Encyclopedia)information storage and retrieval, the systematic process of collecting and cataloging data so that they can be located and displayed on request. Computers and data processing techniques have made pos...

Lewis and Clark expedition

(Encyclopedia)Lewis and Clark expedition, 1803–6, U.S. expedition that explored the territory of the Louisiana Purchase and the country beyond as far as the Pacific Ocean. The men were gathered and in the winte...

National Science Foundation

(Encyclopedia)National Science Foundation (NSF), an independent agency in the executive branch of the U.S. federal government concerned with promoting a national science policy by supporting basic research and educ...

Wallis and Futuna Islands

(Encyclopedia)Wallis and Futuna Islands wŏlˈĭs, fo͞oto͞oˈnä [key], officially Territory of the Wallis and Futuna Islands, French overseas territory (2015 est. pop. 12,000), 106 sq mi (274 sq km), S Pacific, ...

Cheves, Langdon

(Encyclopedia)Cheves, Langdon chĭˈvĭs [key], 1776–1857, American statesman, b. Abbeville District (now Abbeville co.), S.C. Admitted to the bar in 1797, he became one of the leading lawyers of Charleston. In t...

Landau, Lev Davidovich

(Encyclopedia)Landau, Lev Davidovich lyĕf dəvēˈdəvĭch ləndouˈ [key], 1908–68, Soviet physicist, b. Baku, Azerbaijan. A child prodigy in mathematics, he entered Baku Univ. at 14; at 21 he received a doctor...