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Grosvenor, Gilbert Hovey

(Encyclopedia)Grosvenor, Gilbert Hovey hŭvˈē grōvˈnər [key], 1875–1966, American editor, b. Constantinople, Turkey. As director (1903–1919) and later as president (1920–54) of the National Geographic So...

pondweed

(Encyclopedia)pondweed, common name for the family Potamogetonaceae, and for weedy aquatic herbs of the genus Potamogeton, of which about 50 known species inhabit North American ponds and slow streams. They have sl...

Mott Foundation

(Encyclopedia)Mott Foundation, philanthropic trust created (1926) by automobile executive Charles Stewart Mott (1875–1973) to support programs dealing with selected urban problems. The foundation originally conce...

National Rifle Association of America

(Encyclopedia)National Rifle Association of America (NRA), group founded (1871) to promote shooting, hunting, firearm safety, and wildlife conservation. The NRA has more than 3 million members. The association spon...

K'ang-hsi

(Encyclopedia)K'ang-hsi käng shē [key], 1654–1722, 2d emperor of the Ch'ing dynasty of China (1661–1722). He extended Manchu control and promoted learning in the arts and sciences. K'ang-hsi conquered the feu...

Sifton, Sir Clifford

(Encyclopedia)Sifton, Sir Clifford, 1861–1929, Canadian political leader, b. Ontario. A lawyer in Manitoba, he sat (1888–96) in the provincial legislature and then served (1896–1911) in the Canadian House of ...

Tennessee Valley Authority

(Encyclopedia)Tennessee Valley Authority (TVA), independent U.S. government corporate agency, created in 1933 by act of Congress; it is responsible for the integrated development of the Tennessee River basin. The h...

Hague Tribunal

(Encyclopedia)Hague Tribunal, popular name for the Permanent Court of Arbitration established in 1899 by a convention of the First Hague Peace Conference to facilitate arbitration and other forms of dispute resolut...

Mayer, Julius Robert von

(Encyclopedia)Mayer, Julius Robert von, 1814–78, German physician and physicist, studied medicine at Tübingen, Munich, and Paris. From a consideration of the generation of animal heat, he was led to determine th...

baryon

(Encyclopedia)baryon bârˈēŏnˌ [key] [Gr.,=heavy], class of elementary particles that includes the proton, the neutron, and a large number of unstable, heavier particles, known as hyperons. From a technical poi...