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hafnium

(Encyclopedia)hafnium hăfˈnēəm [key], metallic chemical element; symbol Hf; at. no. 72; at. wt. 178.49; m.p. about 2,227℃; b.p. 4,602℃; sp. gr. 13.31 at 20℃; valence +4. Hafnium is a lustrous, ductile, si...

Haida

(Encyclopedia)Haida hīˈdə [key], Native North Americans living primarily on the Queen Charlotte Islands, off British Columbia, and on the southern end of the Prince of Wales Island, off Alaska. They speak the Ha...

hairdressing

(Encyclopedia)hairdressing, arranging of the hair for decorative, ceremonial, or symbolic reasons. Primitive men plastered their hair with clay and tied trophies and badges into it to represent their feats and qual...

kaleidoscope

(Encyclopedia)kaleidoscope kəlīˈdəskōp [key], optical instrument that uses mirrors to produce changing symmetrical patterns. Invented by the Scottish physicist Sir David Brewster in 1816, the device is usually...

Pence, Mike

(Encyclopedia)Pence, Mike (Michael Richard Pence), 1959–, Vice President of the United States (2017–21), b. Columbus, Ind., grad. Hanover College, 1981, Indiana Univ. law school, 1986. A Republican, he twice ra...

Bacon's Rebellion

(Encyclopedia)Bacon's Rebellion, popular revolt in colonial Virginia in 1676, led by Nathaniel Bacon. High taxes, low prices for tobacco, and resentment against special privileges given those close to the governor,...

Witte, Count Sergei Yulyevich

(Encyclopedia)Witte, Count Sergei Yulyevich syĭrgāˈ yo͞oˈlyĭvĭch vĭtˈə [key], 1849–1915, Russian premier. A railway administrator, he became minister of communications (1892) and minister of finance (18...

vortex

(Encyclopedia)vortex vôrˈtĕks [key], mass of fluid in whirling or rotary motion. To simplify the analysis, vortex motion usually describes motions in a frictionless fluid. In such cases the absence of friction w...

celestial mechanics

(Encyclopedia)celestial mechanics, the study of the motions of astronomical bodies as they move under the influence of their mutual gravitation. Celestial mechanics analyzes the orbital motions of planets, dwarf pl...

Cherokee, indigenous people of North America

(Encyclopedia)Cherokee chĕrˈəkē [key], largest Native American group in the United States. Formerly the largest and most important tribe in the Southeast, they occupied mountain areas of North and South Carolin...