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Aymer of Valence, earl of Pembroke

(Encyclopedia)Aymer of Valence, earl of Pembroke: see Pembroke, Aymer de Valence, earl of. ...

York, Edmund of Langley, duke of

(Encyclopedia)York, Edmund of Langley, duke of, 1341–1402, fifth son of Edward III of England. He was made (1362) earl of Cambridge, served on expeditions to Spain and France, and married (1372) Isabel, daughter ...

Wieschaus, Eric Francis

(Encyclopedia)Wieschaus, Eric Francis, 1947–, American biologist and geneticist, b. South Bend, Ind., Ph.D. Yale 1974. He was a researcher at the European Molecular Biology Laboratory in Heidelberg, Germany, from...

Hrdlička, Aleš

(Encyclopedia)Hrdlička, Aleš äˈlĕsh hûrdˈlĭchkä [key], 1869–1943, American anthropologist, b. Humpolec (now in Czech Republic). He received his medical education in the United States. In 1903 he began to...

Darwinism

(Encyclopedia)Darwinism, concept of evolution developed in the mid-19th cent. by Charles Robert Darwin. Darwin's meticulously documented observations led him to question the then current belief in special creation ...

nonlinear dynamics

(Encyclopedia)nonlinear dynamics, study of systems governed by equations in which a small change in one variable can induce a large systematic change; the discipline is more popularly known as chaos (see chaos theo...

Ely, Richard Theodore

(Encyclopedia)Ely, Richard Theodore ēˈlē [key], 1854–1943, American economist, b. Ripley, N.Y., grad. Columbia, 1876, Ph.D. Heidelberg, 1879. He taught at Johns Hopkins (1881–92), the Univ. of Wisconsin (189...

species

(Encyclopedia)species, in biology, a category of classification, the original and still the basic unit in the demarcation of plant and animal types. The species marks the boundary between populations of organisms r...

luminosity

(Encyclopedia)luminosity, in astronomy, the rate at which energy of all types is radiated by an object in all directions. A star's luminosity depends on its size and its temperature, varying as the square of the ra...

Russell, Henry Norris

(Encyclopedia)Russell, Henry Norris, 1877–1957, American astronomer, b. Oyster Bay, N.Y., grad. Princeton, 1897. In 1902 he went to Cambridge, England, to study. He returned to Princeton in 1905, was professor of...