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neutron

(Encyclopedia)neutron, uncharged elementary particle of slightly greater mass than the proton. It was discovered by James Chadwick in 1932. The stable isotopes of all elements except hydrogen and helium contain a n...

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...

manganese

(Encyclopedia)manganese măngˈgənēs, mănˈ– [key] [Lat.,=magnet], metallic chemical element; symbol Mn; at. no. 25; at. wt. 54.93805; m.p. about 1,244℃; b.p. about 1,962℃; sp. gr. 7.2 to 7.45, depending o...

amusement park

(Encyclopedia)amusement park, a commercially operated park offering various forms of entertainment, such as arcade games, carousels, roller coasters, and performers, as well as food, drink, and souvenirs. Amusement...

Garfield, James Abram

(Encyclopedia)Garfield, James Abram, 1831–81, 20th President of the United States (Mar.–Sept., 1881). Born on a frontier farm in Cuyahoga co., Ohio, he spent his early years in poverty. As a youth he worked as ...

Erie Canal

(Encyclopedia)Erie Canal, artificial waterway, c.360 mi (580 km) long; connecting New York City with the Great Lakes via the Hudson River. Locks were built to overcome the 571-ft (174-m) difference between the leve...

Francis Joseph

(Encyclopedia)Francis Joseph or Franz Joseph, 1830–1916, emperor of Austria (1848–1916), king of Hungary (1867–1916), nephew of Ferdinand, who abdicated in his favor. His long reign began in the stormy days o...

Irving, Washington

(Encyclopedia)Irving, Washington, 1783–1859, American author and diplomat, b. New York City. Irving was one of the first Americans to be recognized abroad as a man of letters, and he was a literary idol at home. ...

chemical industry

(Encyclopedia)chemical industry, the business of using chemical reactions to turn raw materials, such as coal, oil, and salt, into a variety of products. During the 19th and 20th cent. technological advances in the...

Palladio, Andrea

(Encyclopedia)Palladio, Andrea ändrĕˈä päl-läˈdēō [key], 1508–80, Italian architect of the Renaissance. Originally a stonemason, he was trained as an architect in Vicenza, and later in Rome he examined t...