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Riemann, Bernhard

(Encyclopedia)Riemann, Bernhard (Georg Friedrich Bernhard Riemann) gāˈôrk frēˈdrĭkh bĕrnˈhärt rēˈmän [key], 1826–66, German mathematician. He studied at the universities of Göttingen and Berlin and w...

Koblenz

(Encyclopedia)Koblenz kōˈblĕnts [key], Eng. Coblenz, city (1994 pop. 109,810), Rhineland-Palatinate, W Germany, at the confluence of the Rhine and the Moselle (Ger. Mosel ) rivers. Its manufactures include fur...

Tell, William

(Encyclopedia)Tell, William, legendary Swiss patriot. According to legend, Tell was a native of Uri, one of the Swiss forest cantons. Gessler, the canton's Austrian bailiff, decreed that Swiss citizens must remove ...

roentgenium

(Encyclopedia)roentgenium, artificially produced radioactive chemical element; symbol Rg; at. no. 111; mass number of most stable isotope 280; m.p., b.p., sp. gr., and valence unknown. Situated in Group 11 of the p...

geopolitics

(Encyclopedia)geopolitics, method of political analysis, popular in Central Europe during the first half of the 20th cent., that emphasized the role played by geography in international relations. Geopolitical theo...

Sturm und Drang

(Encyclopedia)Sturm und Drang shto͝orm o͝ont dräng [key] or Storm and Stress, movement in German literature that flourished from c.1770 to c.1784. It takes its name from a play by F. M. von Klinger, Wirrwarr; od...

yttrium

(Encyclopedia)yttrium ĭtˈrēəm [key] [for Ytterby, a town in Sweden], metallic chemical element; symbol Y; at. no. 39; at. wt. 88.90585; m.p. about 1,522℃; b.p. 3,338℃; sp. gr. about 4.45; valence +3. Yttriu...

George V, king of Great Britain and Ireland

(Encyclopedia)George V (George Frederick Ernest Albert), 1865–1936, king of Great Britain and Ireland (1910–36), second son and successor of Edward VII. At the age of 12 he commenced a naval career, but this en...

Bering, Vitus Jonassen

(Encyclopedia)Bering, Vitus Jonassen vēˈto͝os yōˈnäsən bārˈĭng [key], 1681–1741, Danish explorer in Russian employ. In 1725 he was selected by Peter I to explore far NE Siberia. Having finally moved men...

hardness

(Encyclopedia)hardness, property of matter commonly described as the resistance of a substance to being scratched by another substance. The degree of hardness is relative, different substances being compared with o...