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logic
(Encyclopedia)logic, the systematic study of valid inference. A distinction is drawn between logical validity and truth. Validity merely refers to formal properties of the process of inference. Thus, a conclusion w...Richet, Charles Robert
(Encyclopedia)Richet, Charles Robert shärl rōbĕrˈ rēshāˈ [key], 1850–1935, French physiologist. From 1887 to 1927 he was professor at the Univ. of Paris. His special study was anaphylaxis, a term he used t...Slave
(Encyclopedia)Slave, river, c.310 mi (500 km) long, Northwest Territories, Canada. It comprises the middle sections of the Mackenzie River system. The river channels the waters of Lake Athabasca and the Peace River...Ruth
(Encyclopedia)Ruth, book of the Bible. It tells a story, set in the days of the judges, of the fidelity of a Moabite widow (Ruth) to her widowed mother-in-law (Naomi). After the death of her husband in Moab, Ruth r...Wayland Smith
(Encyclopedia)Wayland Smith, in English folklore, a skillful blacksmith and great armor maker, whose forge was near the White Horse (Oxfordshire). He appears in the Old English Beowulf and Deor and in Sir Walter Sc...South Pass
(Encyclopedia)South Pass, broad, level valley (alt. c.7,550 ft/2,301 m), SW Wyo., cutting across the Rocky Mts. It was used by trappers and explorers before Jedediah Smith inaugurated its use as a route for settler...Neilson, William Allan
(Encyclopedia)Neilson, William Allan nēlˈsən [key], 1869–1946, American educator, b. Scotland, M.A. Univ. of Edinburgh, 1891, Ph.D. Harvard, 1898. He taught English in Scotland and Canada and at Bryn Mawr and ...astronaut
(Encyclopedia)astronaut, crew member on a U.S. manned spaceflight mission; the Soviet term is cosmonaut. Candidates for manned spaceflight are carefully screened to meet the highest physical and mental standards, a...Butler, Benjamin Franklin, 1818–93, American politician and Union general in the Civil War
(Encyclopedia)Butler, Benjamin Franklin, 1818–93, American politician and Union general in the Civil War, b. Deerfield, N.H. He moved to Lowell, Mass., as a youth and later practiced law there and in Boston. He w...Smith, James, American political leader
(Encyclopedia)Smith, James, c.1719–1806, political leader in the American Revolution, signer of the Declaration of Independence, b. Ireland. He settled in Pennsylvania in his youth and practiced law at York. He s...Browse by Subject
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