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bipolar disorder

(Encyclopedia)bipolar disorder, formerly manic-depressive disorder or manic-depression, severe mental disorder involving manic episodes that are usually accompanied by episodes of depression. The term “manic-depr...

Scouts

(Encyclopedia)Scouts or Boy Scouts, organization of boys and girls 11 to 17 years old, founded (1907) in Great Britain by Sir Robert (later Lord) Baden-Powell and originally for boys only; since the late 20th cent....

proton

(Encyclopedia)proton, elementary particle having a single positive electrical charge and constituting the nucleus of the ordinary hydrogen atom. The positive charge of the nucleus of any atom is due to its protons....

radon

(Encyclopedia)radon rāˈdŏn [key], gaseous radioactive chemical element; symbol Rn; at. no. 86; mass no. of most stable isotope 222; m.p. about −71℃; b.p. −61.8℃; density 9.73 grams per liter at STP; vale...

Gray, Thomas

(Encyclopedia)Gray, Thomas, 1716–71, English poet. He was educated at Eton and Peterhouse, Cambridge. In 1739 he began a grand tour of the Continent with Horace Walpole. They quarreled in Italy, and Gray returned...

Tutankhamen

(Encyclopedia)Tutankhamen or Tutenkhamon to͞otˌängkäˈmən, –ĕngk– [key], fl. c.1350 b.c., king of ancient Egypt, of the XVIII dynasty. He was the son-in-law of Ikhnaton and succeeded to the throne after a...

bond

(Encyclopedia)bond, in finance, usually a formal certificate of indebtedness issued in writing by governments or business corporations in return for loans. It bears interest and promises to pay a certain sum of mon...

African music

(Encyclopedia)African music, the music of the indigenous peoples of Africa. Sub-Saharan African music has as its distinguishing feature a rhythmic complexity common to no other region. Polyrhythmic counterpoint, wh...

Tlingit

(Encyclopedia)Tlingit tlĭngˈgĭt [key], group of related Native North American tribes, speaking a language that forms a branch of the Nadene linguistic stock (see Native American languages). The 14 divisions of t...

United States Naval Academy

(Encyclopedia)United States Naval Academy, at Annapolis, Md.; for training young men and women to be officers of the U.S. navy or marine corps. George Bancroft, Secretary of the Navy, founded and opened (1845) it a...