(Encyclopedia) pavement, the wearing surface of a road, street, or sidewalk. Parts of Babylon and Troy are believed to have been paved; Roman roads were noted for their durable stone paving.…
(Encyclopedia) Ricardo, David, 1772–1823, British economist, of Dutch-Jewish parentage. At the age of 20 he entered business as a stockbroker and was so skillful in the management of his affairs that…
(Encyclopedia)
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Position of the sun in the Milky Way
Milky Way, the galaxy of which the sun and solar system are a part, seen as a broad band of light arching across the night sky from horizon…
(Encyclopedia) space science, body of scientific knowledge as it relates to space exploration; it is sometimes also called astronautics. Space science draws on the conventional sciences of physics,…
(Encyclopedia)
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The above Hertzsprung-Russell (H-R) diagram shows the track of stellar evolution for a typical star. After spending much of its life evolving toward or along the main sequence,…
(Encyclopedia) Lehn, Jean-MarieLehn, Jean-MariezhäNˈ-märēˈ lĕN [key], 1939–, French chemist, Ph.D. Univ. of Strasbourg, 1963. A professor at Louis Pasteur Univ. (1970–78) and the Collège de France (…
(Encyclopedia) Kellogg, John Harvey, 1852–1943, American physician, health-food advocate, and breakfast cereal developer, b. Tyrone, N.Y., grad. New York Univ. (M.D., 1875) and continued his medical…
(Encyclopedia) life preserver, a personal flotation device (PFD) intended to keep the wearer afloat, particularly in case of shipwreck. A Type I PFD will keep even unconscious people afloat in a face…
(Encyclopedia) Martin, Saint, c.316–397, bishop of Tours. Born a heathen in Pannonia (in modern Hungary), the son of a soldier, he became a convert and refused to fight Christians. He went (c.360) to…
(Encyclopedia) Hoadly, BenjaminHoadly, Benjaminhōdˈlē [key], 1676–1761, English prelate, center of the Bangorian Controversy within the Church of England. He was a leader in the Low Church group. In…
