Born: 1915Birthplace: Ontario, Canada Electron lens correction device—Hillier is noted for his contributions to the development of the electron microscope. The electron lens is used to focus a beam…
Born: 1873Birthplace: Hudson, Mass. Vacuum tube—Coolidge invented ductile tungsten, the filament material still used in incandescent lamps. He also invented the “Coolidge tube”, the model upon…
(Encyclopedia) mammography, diagnostic procedure that uses low-dose X rays to detect abnormalities in the breasts. Tomosynthesis, also known as 3D mammography, is form of mammography that combines X-…
(Encyclopedia) Tompkins, Daniel D., 1774–1825, American political figure, Vice President of the United States (1817–25), b. Scarsdale, N.Y. A leader of the Jeffersonian group in New York state, he…
(Encyclopedia) radiology, branch of medicine specializing in the use of X rays, gamma rays, radioactive isotopes, and other forms of radiation in the diagnosis and treatment of disease. X ray…
(Encyclopedia) oarfish, large, elongated fish, genus Regalecus, found in the oceans worldwide except for the polar regions. Oarfish species are solitary and rarely seen by humans. The giant oarfish,…
(Encyclopedia) Braun, Karl FerdinandBraun, Karl Ferdinandfĕrˈdēnäntˌ [key]Braun, Karl Ferdinand broun [key], 1850–1918, German physicist. Braun taught at the Univ. of Marburg, Strasbourg Univ.,…
Notable Filmmakers and Directors
Spike Lee
See also Actors African-American Actors Asian American Film & Television Personalities Hispanic-American Film, Television, and Theater…
Spike Lee
See also Actors African-American Actors Asian American Film & Television Personalities Hispanic-American Film, Television, and Theater Personalities Women Stage and…
