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Obregón, Álvaro
(Encyclopedia)Obregón, Álvaro älˈvärō ōbrāgōnˈ [key], 1880–1928, Mexican general and president (1920–24). A planter in Sonora, he supported Francisco I. Madero in the revolution against Porfirio Díaz...octane number
(Encyclopedia)octane number, figure of merit representing the resistance of gasoline to premature detonation when exposed to heat and pressure in the combustion chamber of an internal-combustion engine. Such detona...Guizhou
(Encyclopedia)Guizhou or Kweichow both: gwāˈjōˈ [key], province, c.66,000 sq mi (170,940 sq km), SW China. Guiyang is the capit...urea
(Encyclopedia) CE5 urea yo͝oēˈə [key], organic compound that is the principal end product of nitrogen metabolism in most mammals. Urea was the first animal metabolite to be isolated in crystalline form; its c...Staples, Mavis
(Encyclopedia) Staples, Mavis, 1939- , African American popular singer, b. Chicago, Il. Staples began performing at age 11 with her father, Roebuck “Pops” St...tracer
(Encyclopedia)tracer, an identifiable substance used to follow the course of a physical, chemical, or biological process. In chemistry the ideal tracer has the same chemical properties as the molecule it replaces a...cerium
(Encyclopedia)cerium sērˈēəm [key] [from the asteroid Ceres], metallic chemical element; symbol Ce; at. no. 58; at. wt. 140.116; m.p. 799℃; b.p. 3,426℃; sp. gr. 6.77 at 25℃; valence +3 or +4. Cerium is a ...dating
(Encyclopedia)dating, the determination of the age of an object, of a natural phenomenon, or of a series of events. There are two basic types of dating methods, relative and absolute. In relative dating, the tempor...Henan
(Encyclopedia)Henan or Honan both: ho͝oˈnänˈ [key], province, c.65,000 sq mi (168,350 sq km), NE China. The capital is ...lemur
(Encyclopedia)lemur lēˈmər [key], name for prosimians, or lower primates, of two related families, found only on Madagascar and adjacent islands. Lemurs have monkeylike bodies and limbs, and most have bushy tail...Browse by Subject
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