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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...

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...

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....

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...

Plutarch

(Encyclopedia)Plutarch plo͞oˈtärk [key], a.d. 46?–c.a.d. 120, Greek essayist and biographer, b. Chaeronea, Boeotia. He traveled in Egypt and Italy, visited Rome (where he lectured on philosophy) and Athens, an...

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...

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...

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...

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...