(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…
(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…
(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…
(Encyclopedia) radonradonrāˈdŏn [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…
photos by Carol M. Highsmith Prev Next Havana, Cuba The capital and Cuba's largest city, Havana boasts more than 2.5 million inhabitants. Havana is also one of the America's oldest cities,…
Notable Scientists: Physical Sciences
Astronomers, astrophysicists, chemists, and physicists
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Christopher Columbus
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Columbus and Other Explorers Notable Women Adventurers
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