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Donatus
(Encyclopedia)Donatus (Aelius Donatus) ēˈlēəs dōnätˈəs [key], fl. 4th cent. a.d., Roman grammarian; teacher of St. Jerome. His only well-known work, the Ars grammatica [elements of grammar], was throughout ...ionosphere
(Encyclopedia)ionosphere īŏnˈəsfēr [key], series of concentric ionized layers forming part of the upper atmosphere of the earth from around 30 to 50 mi (50 to 80 km) to 250 to 370 mi (400 to 600 km) where it m...molecule
(Encyclopedia)molecule mŏlˈəkyo͞ol [key] [New Lat.,=little mass], smallest particle of a compound that has all the chemical properties of that compound. A single atom is usually not referred to as a molecule, a...van der Meer, Simon
(Encyclopedia)van der Meer, Simon, 1925–2011, Dutch physical engineer. He spent nearly his entire career at CERN, where he did his most important work with Carlo Rubbia. They discovered the W and Z particles, whi...sky
(Encyclopedia)sky, apparent dome over the earth, background of the clouds, sun, moon, and stars. The blue color of the clear daytime sky results from the selective scattering of light rays by the minute particles o...Benjamin, Karl Stanley
(Encyclopedia)Benjamin, Karl Stanley, 1925–2012, American painter, b. Chicago, grad. Univ. of Redlands (B.A., 1949), Claremont Graduate School (M.A., 1960). Largely self-taught, Benjamin was part of an art scene ...kindergarten
(Encyclopedia)kindergarten [Ger.,=garden of children], system of preschool education. Friedrich Froebel designed (1837) the kindergarten to provide an educational situation less formal than that of the elementary s...precipitation, in chemistry
(Encyclopedia)precipitation, in chemistry, a process in which a solid is separated from a suspension, sol, or solution. In a suspension such as sand in water the solid spontaneously precipitates (settles out) on st...pyroclastic flow
(Encyclopedia)pyroclastic flow, turbulent, fluidized mixture of rock, volcanic ash, and hot gas that moves like an avalanche away from a volcanic eruption. A pyroclastic flow may contain a mix of rock fragments ran...nucleus, in physics
(Encyclopedia)nucleus, in physics, the extremely dense central core of an atom. Following the discovery of radioactivity by A. H. Becquerel in 1896, Ernest Rutherford identified two types of radiation given off b...Browse by Subject
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