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Middle Ages

(Encyclopedia)Middle Ages, period in Western European history that followed the disintegration of the West Roman Empire in the 4th and 5th cent. and lasted into the 15th cent., i.e., into the period of the Renaissa...

letters

(Encyclopedia)letters, in literature, written messages, ranging from those addressed to the public and those sent from lover to lover, to business letters and thank-you notes. The common quality they share is a liv...

Bohr, Niels Henrik David

(Encyclopedia)Bohr, Niels Henrik David bōr [key], 1885–1962, Danish physicist, one of the foremost scientists of modern physics. He studied at the Univ. of Copenhagen (Ph.D. 1911) and carried on research on the...

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...

history

(Encyclopedia)history, in its broadest sense, is the story of humanity's past. It also refers to the recording of that past. The diverse sources of history include books, newspapers, printed documents, personal pap...

rutherfordium

(Encyclopedia)rutherfordium rŭᵺˌərfôrˈdēəm [key], artificially produced radioactive chemical element; symbol Rf; at. no. 104; mass number of most stable isotope 265; m.p., b.p., and sp. gr. unknown; valenc...

translation

(Encyclopedia)translation [Lat.,=carrying across], the rendering of a text into another language. Applied to literature, the term connotes the art of recomposing a work in another language without losing its origin...

Rauschenberg, Robert

(Encyclopedia)Rauschenberg, Robert rouˈshənbûrgˌ [key], 1925–2008, American painter, b. Port Arthur, Tex., as Milton Ernest Rauschenberg. He studied at the Kansas City Art Institute, with Josef Albers at Blac...

Wettin

(Encyclopedia)Wettin vĕtˈĭn [key], German dynasty, which ruled in Saxony, Thuringia, Poland, Great Britain, Belgium, and Bulgaria. It takes its name from a castle on the Saale near Halle. The family gained promi...

electron

(Encyclopedia)electron, elementary particle carrying a unit charge of negative electricity. Ordinary electric current is the flow of electrons through a wire conductor (see electricity). The electron is one of the ...