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Grand Ole Opry

(Encyclopedia)Grand Ole Opry, weekly American radio program featuring live country and western music. The nation's oldest continuous radio sho...

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...

carbon dioxide

(Encyclopedia)carbon dioxide, chemical compound, CO2, a colorless, odorless, tasteless gas that is about one and one-half times as dense as air under ordinary conditions of temperature and pressure. It does not bur...

ammonia

(Encyclopedia)ammonia, chemical compound, NH3, colorless gas that is about one half as dense as air at ordinary temperatures and pressures. It has a characteristic pungent, penetrating odor. Ammonia forms a minute ...

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...