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Archimedes

(Encyclopedia)Archimedes ärkĭmēˈdēz [key], 287–212 b.c., Greek mathematician, physicist, and inventor. He is famous for his work in geometry (on the circle, sphere, cylinder, and parabola), physics, mechanic...

sulfide

(Encyclopedia)sulfide, chemical compound containing sulfur and one other element or sulfur and a radical. Sulfides may be salts or esters of hydrogen sulfide, H2S, or may be formed directly, e.g., by heating a meta...

Kwan, Michelle Wingshan

(Encyclopedia)Kwan, Michelle Wingshan, 1980–, American figure skater, b. Torrance, Calif., In 1994 she won the silver medal at the U.S. National Championships and the gold medal in the World Junior Championships....

Kahanamoku, Duke

(Encyclopedia)Kahanamoku, Duke, 1890–1968, American swimmer and surfer, b. Honolulu. A native Hawaiian, he was an excellent swimmer, surfer, and canoeist, and by 1911 he was setting Amateur Athletic Union swimmin...

Cerro de Pasco

(Encyclopedia)Cerro de Pasco sĕrˈrō ᵺā päsˈkō [key], city, capital of Pasco dept., central...

Guanajuato, city, Mexico

(Encyclopedia)Guanajuato, city, capital of Guanajuato state, W central Mexico. The city, with an altitude of c.6,600 ft (2,000 m), is situated in the Cañada de Marfi...

Felix, Allyson Michelle

(Encyclopedia)Felix, Allyson Michelle, 1985–, American sprinter, b. Los Angeles. She is a six-time Olympic champion, winning the 200-m (2012), the 4×100-m (2012, 2016), and the 4×400-m races (2008, 2012, 2016),...

North Little Rock

(Encyclopedia)North Little Rock, city (1990 pop. 61,741), Pulaski co., central Ark., on the Arkansas River opposite Little Rock; settled c.1856, inc. as a city 1903. North Little Rock lies in a cotton, rice, soybea...

Teller, Henry Moore

(Encyclopedia)Teller, Henry Moore, 1830–1914, American statesman, b. Allegany co., N.Y. A lawyer, he practiced in Colorado after 1861. He commanded a militia district in the Civil War period. When Colorado became...

Butte, city, United States

(Encyclopedia)Butte byo͞ot [key], city (2020 pop. 34,494), seat of Silver Bow co., SW Mont.; inc. 1879. It...