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Roca, Julio Argentino

(Encyclopedia)Roca, Julio Argentino ho͞oˈlyō ärhāntēˈnō rōˈkä [key], 1843–1914, general who became president of Argentina (1880–86, 1898–1904). Minister of war under Nicolas Avellaneda, he crushed ...

Leakey, Mary Douglas

(Encyclopedia)Leakey, Mary Douglas, 1913–96, British archaeologist, b. London as Mary Douglas Nicol; wife of Louis Leakey and mother of Richard Leakey. She had little formal education, but a fascination with arch...

Sarmiento, Domingo Faustino

(Encyclopedia)Sarmiento, Domingo Faustino dōmēngˈgō foustēˈnō särmyānˈtō [key], 1811–88, Argentine statesman, educator, and author, president of the republic (1868–74). An opponent of Juan Manuel de ...

polarization of light

(Encyclopedia)polarization of light, orientation of the vibration pattern of light waves in a singular plane. Unpolarized light can be converted into a single polarized beam by means of the Nicol prism, a device ...

Canadian art and architecture

(Encyclopedia)Canadian art and architecture, the various types and styles arts and structures produced in the geographic area that now constitutes Canada. For a discussion of the art of indigenous peoples of Canada...

Colombia

(Encyclopedia)CE5 Colombia kəlŭmˈbēə, Span. kōlōmˈbyä [key], officially Republic of Col...

Argentina

(Encyclopedia)CE5 Argentina ärjəntēˈnə, Span. ärhāntēˈnä [key], officially Argentine Republic, republic (2020 est. pop. 45,380,000), 1,072,157 sq mi (2,776,889 sq k...

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