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Heck, Richard Fred

(Encyclopedia)Heck, Richard Fred, 1931–2015, American chemist, b. Springfield, Mass., Ph.D. Univ. of California, Los Angeles, 1954. Heck was a researcher at the Hercules Corporation in Wilmington, Del., from 1957...

X-ray crystallography

(Encyclopedia)X-ray crystallography, the study of crystal structures through X-ray diffraction techniques. When an X-ray beam bombards a crystalline lattice in a given orientation, the beam is scattered in a defini...

Clark, Kenneth MacKenzie

(Encyclopedia)Clark, Kenneth MacKenzie (Lord Clark of Saltwood), 1903–83, English art historian, studied Oxford. After working with Bernard Berenson in Florence, Clark was keeper of the department of fine art at ...

Filson, John

(Encyclopedia)Filson, John, c.1753–1788, Kentucky pioneer, b. Chester co., Pa. In 1783 he acquired land in Kentucky, taught school, and wrote Discovery, Settlement, and Present State of Kentucke (1784). This firs...

Micah, book of the Bible

(Encyclopedia)Micah mīˈkə [key], 6th of the books of the Minor Prophets of the Bible, containing the oracles of the prophet Micah, a contemporary of Isaiah whose career spanned the period c.750–c.700 b.c. The ...

Numbers

(Encyclopedia)Numbers, book of the Bible, fourth of the five books of the Law (the Pentateuch or Torah) ascribed by tradition to Moses. Numbers begins at Sinai and ends in Moab on the eve of the Hebrews' entry into...

Lewis, Meriwether

(Encyclopedia)Lewis, Meriwether, 1774–1809, American explorer, one of the leaders of the Lewis and Clark expedition, b. near Charlottesville, Va. He was a captain in the army and served in a number of campaigns a...

Ælfric

(Encyclopedia)Ælfric ălˈfrĭk [key], c.955–1020, English writer and Benedictine monk. He was the greatest English scholar during the revival of learning fostered by the Benedictine monasteries in the second ha...

ether, in chemistry

(Encyclopedia)CE5 Ethers ether, any of a number of organic compounds whose molecules contain two hydrocarbon groups joined by single bonds to an oxygen atom. The most common of these compounds is ethyl ether, C...

Gamow, George

(Encyclopedia)Gamow, George gămˈŏf [key], 1904–68, Russian-American theoretical physicist and author, b. Odessa. A nuclear physicist, Gamow is better known to the public for his excellent books popularizing ab...