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Abacha, Sani

(Encyclopedia)Abacha, Sani, 1943–98, Nigerian military officer and political leader, b. Kano. He received military training in Nigeria and England, joining the Nigerian army in 1963. Abacha participated in severa...

Atlantic Charter

(Encyclopedia)Atlantic Charter ətlătĭk, ăt– [key], joint program of peace aims, enunciated by Prime Minister Winston Churchill of Great Britain and President Franklin Delano Roosevelt of the United States on ...

gypsum

(Encyclopedia)gypsum jĭpˈsəm [key], mineral composed of calcium sulfate (calcium, sulfur, and oxygen) with two molecules of water, CaSO4·2H2O. It is the most common sulfate mineral, occurring in many places in ...

World's Columbian Exposition

(Encyclopedia)World's Columbian Exposition, held at Chicago, May–Nov., 1893, in commemoration of the 400th anniversary of the discovery of America by Christopher Columbus. Authorized (1890) by Congress, it was pl...

Vieira, João Bernardo

(Encyclopedia)Vieira, João Bernardo zhwouN bârnärˈdō vēâˈrə [key], 1939–2009, Guinean political leader, president of Guinea-Bissau (1994–99, 2005–9), b. Bissau. He joined the African Party for the In...

Ewell, Benjamin Stoddert

(Encyclopedia)Ewell, Benjamin Stoddert yo͞oˈəl [key], 1810–94, American educator, b. Georgetown, D.C., grad. West Point, 1832; brother of Gen. R. S. Ewell. He taught mathematics at West Point, Hampden-Sidney C...

Lew, Jack

(Encyclopedia)Lew, Jack (Jacob Joseph Lew), 1955–, American government official, b. New York City, grad. Harvard (1978), Georgetown Univ. Law School (1983). A Democrat, he first worked politics at 17 in Eugene Mc...

Nicol prism

(Encyclopedia)Nicol prism nĭkˈəl [key], optical device invented (1828) by William Nicol of Edinburgh. It consists essentially of a crystal of calcite, or Iceland spar, that is cut at an angle into two equal piec...

hydrotherapy

(Encyclopedia)hydrotherapy, use of water in the treatment of illness or injury. Although the medicinal and hygienic value of water was recognized by the early Greeks, hydrotherapy attained its widest use in the 18t...