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chemistry

(Encyclopedia)chemistry, branch of science concerned with the properties, composition, and structure of substances and the changes they undergo when they combine or react under specified conditions. Organic chemi...

bicycle

(Encyclopedia)bicycle, light, two-wheeled vehicle driven by pedals. The name velocipede is often given to early forms of the bicycle and to its predecessor, the dandy horse, a two-wheeled vehicle moved by the thrus...

Humboldt, Alexander, Freiherr von

(Encyclopedia)Humboldt, Alexander, Freiherr von hŭmˈbōlt, Ger. älĕksänˈdər frīˈhĕr fən ho͝omˈbôlt [key], 1769–1859, German naturalist, inventor, explorer, and author, the most eminent scientist of ...

Engels, Friedrich

(Encyclopedia)Engels, Friedrich frēˈdrĭkh ĕngˈəls [key], 1820–95, German socialist; with Karl Marx, one of the founders of modern Communism (see communism). The son of a wealthy Rhenish textile manufacturer...

Eliot, George

(Encyclopedia)Eliot, George, pseud. of Mary Ann or Marian Evans, 1819–80, English novelist, b. Arbury, Warwickshire. One of the great English novelists, she was reared in a strict atmosphere of evangelical Protes...

bourgeoisie

(Encyclopedia)bourgeoisie bo͝orzhwäzēˈ [key], originally the name for the inhabitants of walled towns in medieval France; as artisans and craftsmen, the bourgeoisie occupied a socioeconomic position between the...

superconductivity

(Encyclopedia)superconductivity, abnormally high electrical conductivity of certain substances. The phenomenon was discovered in 1911 by Heike Kamerlingh Onnes, who found that the resistance of mercury dropped sudd...

Trier

(Encyclopedia)Trier trēr [key], Latin Augusta Treverorum, city (1994 pop. 99,183), Rhineland-Palatinate, SW Germany, a port on the Moselle (Ger. Mosel) River, near the Luxembourg border. It is also known, in Engli...

Schiller, Friedrich von

(Encyclopedia)Schiller, Friedrich von, 1759–1805, German dramatist, poet, and historian, one of the greatest of German literary figures, b. Marbach, Württemberg. The poets of German romanticism were strongly inf...

war

(Encyclopedia)war, armed conflict between states or nations (international war) or between factions within a state (civil war), prosecuted by force and having the purpose of compelling the defeated side to do the w...