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Wood, Robert Williams

(Encyclopedia)Wood, Robert Williams, 1868–1955, American physicist, b. Concord, Mass., grad. Harvard (B.A., 1891). After studying abroad he became associated with Johns Hopkins as professor of experimental physic...

age grade and age set

(Encyclopedia)age grade and age set, differentiation of social role based on age, commonly found in small-scale societies of North America and East Africa. Age sets are a type of sodality (nonresidential groups tha...

trickster

(Encyclopedia)trickster, a mythic figure common among Native North Americans, South Americans, and Africans. Usually male but occasionally female or disguised in female form, he is notorious for exaggerated biologi...

Todorov, Tzvetan

(Encyclopedia)Todorov, Tzvetan, 1939–2017, Bulgarian-French literary theorist, historian of ideas, and sociologist, b. Sofia, Bulgaria, Ph.D. Univ. of Paris, 1966. He joined (1968) the National Center for Scienti...

Dubochet, Jacques

(Encyclopedia)Dubochet, Jacques, 1942–, Swiss biophysicist and molecular biologist, Ph.D., Univ. of Geneva 1973. Dubochet was a researcher at the European Molecular Biology Laboratory in Heidelberg from 1978 to 1...

humus

(Encyclopedia)humus hyo͞oˈməs [key], organic matter that has decayed to a relatively stable, amorphous state. It is an important biological constituent of fertile soil. Humus is formed by the decomposing action ...

Horney, Karen

(Encyclopedia)Horney, Karen, 1885–1952, American psychiatrist, b. Germany, M.D. Univ. of Berlin, 1913. She married Oscar Horney in 1909. Prior to her arrival (1932) in the United States, she was secretary of the ...

Guillemin, Roger Charles Louis

(Encyclopedia)Guillemin, Roger Charles Louis gēyəmăNˈ [key], 1924–, French-American physiologist, b. Dijon, France. Educated in France, he fought for the resistance during World War II. He taught primarily at...

Maupertuis, Pierre Louis Moreau de

(Encyclopedia)Maupertuis, Pierre Louis Moreau de pyĕr lwē môrōˈ də mōpĕrtüēˈ [key], 1698–1759, French mathematician and astronomer. For his skillful support of Newton's theory he was admitted to the Ro...

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...