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Helwan

(Encyclopedia)Helwan wänˈ [key], town (1989 est. pop. 230,000), N Egypt, on the Nile River, opposite the ruins of Memphis; a suburb of Cairo. Manufactures include iron and steel, cement, and textiles; there is a ...

Ailly, Pierre d'

(Encyclopedia)Ailly, Pierre d' pyĕr dāyēˈ [key], 1350–1420, French theologian and writer, cardinal of the Roman Catholic Church. He was the teacher of John Gerson and was Gerson's predecessor as chancellor of...

expansion

(Encyclopedia)expansion, in physics, increase in volume resulting from an increase in temperature. Contraction is the reverse process. When heat is applied to a body, the rate of vibration and the distances between...

Lüshun

(Encyclopedia)Lüshun lo͞oˈsho͝onˈ [key], formerly Port Arthur, Jap. Ryojun, former city, SW Liaoning prov., China, at the tip of the Liaodong peninsula. It was formerly combined with Dailian (Dairen) into the ...

Mukasey, Michael Bernard

(Encyclopedia)Mukasey, Michael Bernard myo͞okāˈzē [key], 1941–, American jurist, b. Bronx, N.Y., grad. Columbia (A.B., 1963), Yale Law School (LL.B., 1967). After being in private practice (1967–72), he was...

Redwood National Park

(Encyclopedia)Redwood National Park, 112,430 acres (45,518 hectares), along the Pacific coast, NW Calif.; est. 1968. Backed by coastal bluffs, 40 mi (64 km) of beach, lagoon, and rocky coast are preserved in their ...

Shasta Dam

(Encyclopedia)Shasta Dam, 602 ft (183 m) high and 3,460 ft (1,055 m) long, on the Sacramento River, N Calif.; built 1938–45. One of the largest concrete dams in the world, it is a major unit in the Central Valley...

shell money

(Encyclopedia)shell money, medium of exchange consisting of shells, the most widely distributed type of ancient currency. Shells are particularly useful as money because they may be strung in long strips of proport...

Barré-Sinoussi, Françoise

(Encyclopedia)Barré-Sinoussi, Françoise, 1947–, French virologist, Ph.D. Pasteur Institute, Paris, 1974. She has been a professor at the Pasteur Institute since 1974 and was appointed head of its retroviral uni...

Albizu Campos, Pedro

(Encyclopedia)Albizu Campos, Pedro pāˈdrō älbēˈso͞o kämˈpōs [key], 1891–1965, Puerto Rican political leader. After service in an African-American unit during World War I he developed a lasting enmity fo...