FACTFILE: PHYSICAL WORLDFIND OUT MOREDespite its being called “Earth,” more than two-thirds of our planet’s surface is covered in water. The rest consists of seven vast expanses of land called…
(Encyclopedia) cyclone, atmospheric pressure distribution in which there is a low central pressure relative to the surrounding pressure. The resulting pressure gradient, combined with the Coriolis…
actressBorn: 8/9/1968Birthplace: Chicago Best known as the super-skeptical special agent Scully on television's The X-files (1993–present), this fiery redhead bears little resemblance to her…
(Encyclopedia) Nilsson, LennartNilsson, Lennartlĕnˈnärt nĭlˈsôn [key], 1922–2017, Swedish photographer who made pioneering microphotographs of embryos and the human body. Nilsson began his career as…
(Encyclopedia) Mitchell, William (Billy Mitchell), 1879–1936, American army officer and pilot, b. Nice, France. He enlisted (1898) in the U.S. army in the Spanish-American War and received a…
(Encyclopedia) organometallic chemistry, the reactions and use of a class of compounds (R-M) that contain a covalent bond between carbon and metal. They are prepared either by direct reaction of the…
(Encyclopedia) electronegativityelectronegativityĭlĕkˌtrōnĕgətĭvˈətē [key], in chemistry, tendency for an atom to attract a pair of electrons that it shares with another atom (see chemical bond). For…
(Encyclopedia) Sverdrup, Harald UlrikSverdrup, Harald Ulrikhäˈräl &oomacr;lˈrĭk svĕrˈdr&oobreve;p [key], 1888–1957, Norwegian oceanographer and meteorologist. He was in charge of the…
