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race

(Encyclopedia) race, one of the group of populations regarded as constituting humanity. The differences that have historically determined the classification into races are predominantly physical…

DK Science: Separating Mixtures

DECANTING GOLDDISTILLATIONFILTRATIONCHROMATOGRAPHYFIND OUT MOREThe substances in a mixture are separated by the differences in their physical properties, such as their particle size. The more…

Cloning 101

Take a look back at the science of cloning, for both therapeutic and reproductive use Dolly the SheepAP…

Determining the Sex of Offspring

The Question: My wife and I have argued this, and I've had trouble finding the answer. Which sex carries the genes to determine the sex of the offspring...…

Frank Sinatra

Source: Archive Photos Sinatra continued to wow critics and fans when he made the leap to film and emerged as a serious actor. His role as doomed soldier Angelo Maggio in 1953's poignant portrait…

Los Alamos

(Encyclopedia) Los AlamosLos Alamoslôs ălˈəmōsˌ, lŏs [key], uninc. town (1990 pop. 11,455), seat of Los Alamos co., N central N.Mex. It is on a long mesa extending from the Jemez Mts. The U.S.…

Luria, Salvador Edward

(Encyclopedia) Luria, Salvador Edward, 1912–1991, American physician, b. Turin, Italy, M.D., Univ. of Turin, 1935. He conducted research and taught at the Institute of Radium in Paris (1938–40),…

Muller, Hermann Joseph

(Encyclopedia) Muller, Hermann JosephMuller, Hermann Josephmŭlˈər [key], 1890–1967, American geneticist and educator, b. New York City, grad. Columbia (B.A., 1910; Ph.D., 1916). A student of Thomas…

Rogers, Roy

(Encyclopedia) Rogers, Roy, 1911–98, American Western film star, b. Cincinnati, Ohio, as Leonard Franklin Slye. The guitar-strumming Rogers succeeded Gene Autry as America's favorite singing cowboy…