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Zewail, Ahmed Hassan

(Encyclopedia)Zewail, Ahmed Hassan, 1946–2016, Egyptian-American chemist, b. Damanhur, Egypt, Ph.D. Univ. of Pennsylvania, 1974. He became a U.S. citizen in 1982. A professor at the California Institute of Techno...

Mueller, Robert Swan, 3d

(Encyclopedia)Mueller, Robert Swan, 3d, 1944–, American law enforcement official, b. New York City, B.A. Princeton, 1966, M.A. New York Univ., 1967, J.D. Univ. of Virginia School of Law, 1973. After serving in Vi...

Seaborg, Glenn Theodore

(Encyclopedia)Seaborg, Glenn Theodore sēˈbôrg [key], 1912–99, American chemist, b. Ishpeming, Mich., grad. Univ. of California at Los Angeles, 1934, Ph.D. Univ. of California at Berkeley, 1937. In 1939, he beg...

Pliocene epoch

(Encyclopedia)Pliocene epoch plīˈəsēn [key], fifth epoch of the Cenozoic era of geologic time (see Geologic Timescale, tablegeologic timescale, table), from 5.1 to 2 million years ago. By the beginning of the P...

Reagan, Ronald Wilson

(Encyclopedia)Reagan, Ronald Wilson rāˈgən [key], 1911–2004, 40th president of the United States (1981–89), b. Tampico, Ill. In 1932, after graduation from Eureka College, he became a radio announcer and spo...

Kelley, Hall Jackson

(Encyclopedia)Kelley, Hall Jackson, 1790–1874, American propagandist for the settlement of Oregon, b. Northwood, N.H. A schoolmaster in Boston (1818–23) and later a railroad surveyor in Maine, he founded (1829)...

Kuhn, Thomas Samuel

(Encyclopedia)Kuhn, Thomas Samuel, 1922–96, American philosopher and historian of science, b. Cincinnati, Ohio. He trained as a physicist at Harvard (Ph.D. 1949), where he taught the history of science from 1948 ...

Lewis, Clarence Irving

(Encyclopedia)Lewis, Clarence Irving, 1883–1964, American philosopher, b. Stoneham, Mass., grad. Harvard (B.A., 1906; Ph.D., 1910). After teaching (1911–20) at the Univ. of California, he was professor of philo...

Lovejoy, Arthur Oncken

(Encyclopedia)Lovejoy, Arthur Oncken, 1873–1962, American philosopher and intellectual historian, b. Germany, grad. Univ. of California, 1895, M.A. Harvard, 1897. He also studied at the Sorbonne before he began t...

Lowie, Robert Harry

(Encyclopedia)Lowie, Robert Harry, or Robert Heinrich Lowie lōˈē [key], 1883–1957, American anthropologist, b. Vienna, grad. College of the City of New York, 1901, Ph.D. Columbia, 1908. He was on the staff of ...