Columbia Encyclopedia

(Encyclopedia) Goslar gôsˈlär [key], city, Lower Saxony, central Germany, at the northern foot of the Har...

(Encyclopedia) guide dog, a dog trained to lead a blind person. The first school for training such dogs was established by the German government after World War I for the benefit of blinded veterans. Schools now exi...

(Encyclopedia) guilt, in psychology, a term denoting an unpleasant feeling associated with unfulfilled wishes. Sigmund Freud initially contended that sexual drives produce sense of guilt in the superego, the moral c...

(Encyclopedia) free radical, in chemistry, a molecule or atom that contains an unpaired electron but is neither positively nor negatively charged. Free radicals are usually highly reactive and unstable. They are pro...

(Encyclopedia) MacDonald, Ramsay (James Ramsay McDonald), 1866–1937, British statesman, b. Scotland. The illegitimate son of a servant, he went as a young man to London, where he joined the Social Democratic Feder...

(Encyclopedia) chromium krōˈmēəm [key] [Gr.,=color], metallic chemical element; symbol Cr; at. no. 24; at. wt. 51.9961; m.p. about 1,857℃; b.p. 2,672℃; sp. gr. about 7.2 at 20℃; valence +2, +3, +6. Chromiu...

(Encyclopedia) radiation sickness, harmful effect produced on body tissues by exposure to radioactive substances. The biological action of radiation is not fully understood, but it is believed that a disturbance in ...

(Encyclopedia) metallurgy mĕtˈəlûrˌjē [key], science and technology of metals and their alloys. Modern metallurgical research is concerned with the preparation of radioactive metals, with obtaining metals econ...

(Encyclopedia) MacVeagh, Isaac Wayne məkvāˈ [key], 1833–1917, American political figure, U.S. Attorney General (1881), b. Chester co., Pa. A lawyer, he was the son-in-law of Simon Cameron, Republican boss of Pe...

(Encyclopedia) Madden, John Earl, 1936-2021, American football coach and broadcaster, b. Austin, Mn., Cal. Polytechic, San Luis Obispo (B.S., 1959; M.S., 1961). Madden...