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Holbein, Hans

(Encyclopedia)Holbein, Hans häns hôlˈbīn [key] the elder, c.1465–1524, German painter and draftsman. Holbein worked principally in Augsburg and Ulm, painting altarpieces for churches and probably creating por...

intelligence

(Encyclopedia)intelligence, in psychology, the general mental ability involved in calculating, reasoning, perceiving relationships and analogies, learning quickly, storing and retrieving information, using language...

Madero, Francisco Indalecio

(Encyclopedia)Madero, Francisco Indalecio fränsēˈskō ēndälāˈsyō mäᵺāˈrō [key], 1873–1913, Mexican statesman and president (1911–13). A champion of democracy and social reform, he established vari...

Marsalis, Wynton

(Encyclopedia)Marsalis, Wynton märsălˈĭs [key], 1961–, American trumpeter, bandleader, and composer, b. New Orleans. Born into a distinguished jazz family, he studied classical music at Juilliard. He joined A...

Rainey, Gertrude "Ma"

(Encyclopedia)Rainey, Gertrude "Ma," 1886–1939, African-American blues singer and songwriter, b. Columbus, Ga., as Gertrude Melissa Nix Pridgett. Rainey's place and...

Ravenna, city, Italy

(Encyclopedia)Ravenna rävĕnˈnä [key], city (1991 pop. 135,844), capital of Ravenna prov., in Emilia-Romagna, N central Italy, near the Adriatic Sea (with which it is connected by a canal). It is an agricultural...

red shift

(Encyclopedia)red shift or redshift, in astronomy, the systematic displacement of individual lines in the spectrum of a celestial object toward the red, or longer wavelength, end of the visible spectrum. The effect...

technetium

(Encyclopedia)technetium tĕknēˈshēəm [key] [Gr. technetos=artificial], artificially produced radioactive chemical element; symbol Tc; at. no. 43; mass no. of most stable isotope 98; m.p. 2,200℃; b.p. 4,877�...

roller

(Encyclopedia)roller, common name for brightly colored Old World birds noted for performing somersaults in flight. They include the rollers proper (subfamily Coraciinae) and ground rollers (subfamily Brachypteracii...

Vesta, in astronomy

(Encyclopedia)Vesta vĕsˈtə [key], in astronomy, the fourth asteroid to be discovered. It was found in 1807 by H. Olbers. It is the third largest asteroid in size, with a diameter of c.326 mi (525 km). Its averag...