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San Francisco

(Encyclopedia)San Francisco săn frănsĭsˈkō [key], city (2020 pop. 873,965), coextensive with San Francisco co., W ...

thermodynamics

(Encyclopedia)thermodynamics, branch of science concerned with the nature of heat and its conversion to mechanical, electric, and chemical energy. Historically, it grew out of efforts to construct more efficient he...

wind

(Encyclopedia)wind, flow of air relative to the earth's surface. A wind is named according to the point of the compass from which it blows, e.g., a wind blowing from the north is a north wind. The diurnal, or dai...

star

(Encyclopedia)star, hot incandescent sphere of gas, held together by its own gravitation, and emitting light and other forms of electromagnetic radiation whose ultimate source is nuclear energy. The universe co...

language

(Encyclopedia)language, systematic communication by vocal symbols. It is a universal characteristic of the human species. Nothing is known of its origin, although scientists have identified a gene that clearly cont...

Frederick II, Holy Roman emperor and German king

(Encyclopedia)Frederick II, 1194–1250, Holy Roman emperor (1220–50) and German king (1212–20), king of Sicily (1197–1250), and king of Jerusalem (1229–50), son of Holy Roman Emperor Henry VI and of Consta...

dance

(Encyclopedia)dance [Old High Ger. danson=to drag, stretch], the art of precise, expressive, and graceful human movement, traditionally, but not necessarily, performed in accord with musical accompaniment. Dancing ...

Constitutional Convention

(Encyclopedia)Constitutional Convention, in U.S. history, the 1787 meeting in which the Constitution of the United States was drawn up. The convention at Philadelphia drew up one of the most influential document...

Alberta

(Encyclopedia)CE5 Alberta ălbûrˈtə [key], province, 255,285 sq mi (661,188 sq km), including 6,485 sq mi (16,796 sq km) of water surface, W Canada. Alberta was originally part...

tragedy

(Encyclopedia)tragedy, form of drama that depicts the suffering of a heroic individual who is often overcome by the very obstacles he is struggling to remove. The protagonist may be brought low by a character flaw ...