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videodisc
(Encyclopedia)videodisc or videodisk, disk used with a special player and television to reproduce both pictures and sound. A videodisc player cannot record television programs off the air for later playback, unlike...Kelvin, William Thomson, 1st Baron
(Encyclopedia)Kelvin, William Thomson, 1st Baron, 1824–1907, British mathematician and physicist, b. Belfast. He was professor of natural philosophy at the Univ. of Glasgow (1846–99). He is known especially for...multimedia
(Encyclopedia)multimedia, in personal computing, software and applications that combine text, high-quality sound, two- and three-dimensional graphics, animation, photo images, and full-motion video. In order to wor...learning disabilities
(Encyclopedia)learning disabilities, in education, any of various disorders involved in understanding or using spoken or written language, including difficulties in listening, thinking, talking, reading, writing, s...Bell, Alexander Graham
(Encyclopedia)Bell, Alexander Graham, 1847–1922, American scientist, inventor of the telephone, b. Edinburgh, Scotland, educated at the Univ. of Edinburgh and University College, London; son of Alexander Melville...pulsar
(Encyclopedia)pulsar, in astronomy, a neutron star that emits brief, sharp pulses of energy instead of the steady radiation associated with other natural sources. The study of pulsars began when Antony Hewish and h...Edison, Thomas Alva
(Encyclopedia)Edison, Thomas Alva, 1847–1931, American inventor, b. Milan, Ohio. A genius in the practical application of scientific principles, Edison was one of the greatest and most productive inventors of his...Douglass, Frederick
(Encyclopedia)Douglass, Frederick dŭgˈləs [key], c.1818–1895, American abolitionist, b. near Easton, Md. as Frederick Augustus Washington Bailey. The son of a black slave, Harriet Bailey, and a white father, m...David, Jacques-Louis
(Encyclopedia)David, Jacques-Louis zhäk-lwēˈ dävēdˈ [key], 1748–1825, French painter. David was the virtual art dictator of France for a generation. Extending beyond painting, his influence determined the c...folk song
(Encyclopedia)folk song, music of anonymous composition, transmitted orally. The theory that folk songs were originally group compositions has been modified in recent studies. These assume that the germ of a folk m...Browse by Subject
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