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Gates, Bill

(Encyclopedia)Gates, Bill (William Henry Gates 3d), 1955–, American business executive, b. Seattle, Wash. At the age of 19, Gates founded (1975) the Microsoft Corp....

Byrom, John

(Encyclopedia)Byrom, John bīˈrəm [key], 1692–1763, English shorthand expert and poet, educated at Trinity College, Cambridge. He devised an early shorthand system, which he taught in Manchester. Although he co...

All-American Canal

(Encyclopedia)All-American Canal, 80 mi (129 km) long, SE Calif.; part of the federal irrigation system of the Hoover Dam. Built between 1934 and 1940 across the Colorado Desert, the canal is entirely within the Un...

Brahmagupta

(Encyclopedia)Brahmagupta bräˌməgo͝opˈtə [key], c.598–c.660, Indian mathematician and astronomer. He was among the first to meaningfully discuss the concepts of zero and of negative numbers. He wrote in ver...

Pitman, Sir Isaac

(Encyclopedia)Pitman, Sir Isaac, 1813–97, English inventor of phonographic shorthand. In Stenographic Soundhand (1837) he set forth a shorthand system based on phonetic rather than orthographic principles; adapte...

pound

(Encyclopedia)pound, abbr. lb, unit of either mass or force in the customary system of English units of measurement. Two different pounds of mass are defined, one in the avoirdupois system of units and one in the T...

relativity

(Encyclopedia)relativity, physical theory, introduced by Albert Einstein, that discards the concept of absolute motion and instead treats only relative motion between two systems or frames of reference. One consequ...

shorthand

(Encyclopedia)CE5 Shorthand systems shorthand, any brief, rapid system of writing that may be used in transcribing, or recording, the spoken word. Such systems, many having characters based on the letters of th...

blood groups

(Encyclopedia)blood groups, differentiation of blood by type, classified according to immunological (antigenic) properties, which are determined by specific substances on the surface of red blood cells. Blood group...

Five Dynasties and Ten Kingdoms

(Encyclopedia)Five Dynasties and Ten Kingdoms, period of Chinese history between the fall of the T'ang dynasty (a.d. 907) and the establishment of the Sung dynasty (a.d. 960). It is named for the five successive sh...