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Roentgen, Wilhelm Conrad
(Encyclopedia)Roentgen or Röntgen, Wilhelm Conrad both: rĕntˈgĭn, rŭntˈ–, Ger. vĭlˈhĕlm kônˈrät röntˈgən [key], 1845–1923, German physicist. His notable research in many fields of physics, especi...fuel cell
(Encyclopedia)fuel cell, electric cell in which the chemical energy from the oxidation of a gas fuel is converted directly to electrical energy in a continuous process (see oxidation and reduction). The efficiency ...thermoelectricity
(Encyclopedia)thermoelectricity, direct conversion of heat into electric energy, or vice versa. The term is generally restricted to the irreversible conversion of electricity into heat described by the English phys...windmill
(Encyclopedia)windmill, apparatus that harnesses wind power for a variety of uses, e.g., pumping water, grinding corn, driving small sawmills, and driving electrical generators. Windmills were probably not known in...Banks, Dennis James
(Encyclopedia)Banks, Dennis James, 1937–2017, Native American civil-rights activist, b. Leech Lake Reservation, Minn. Of Ojibwa (Chippewa) heritage, he helped found the American Indian Movement (1968) to fight fo...Samper Pizano, Ernesto
(Encyclopedia)Samper Pizano, Ernesto ĕrnĕsˈtō sämpĕrˈ pēzäˈnō [key], 1950–, Colombian politician, president of Colombia (1994–98), b. Bogotá. An economist, lawyer, former professor, and member of th...Field, Rachel
(Encyclopedia)Field, Rachel, 1894–1942, American writer, b. New York City, educated at Radcliffe. Her books for children include The Cross-Stitch Heart and Other One-Act Plays (1927), Hitty: Her First Hundred Yea...top
(Encyclopedia)top, toy with a tapering point on which it can be made to spin. Tops were known in antiquity and appeared in Europe during the Middle Ages; they are used today in many different regions of the world b...crystal
(Encyclopedia) CE5 Types of crystal crystal, a solid body bounded by natural plane faces that are the external expression of a regular internal arrangement of constituent atoms, molecules, or ions. The formation...Katsura, Taro
(Encyclopedia)Katsura, Taro tärōˈ kätˈso͞orä [key], 1847–1913, Japanese statesman. A Choshu clansman, and a protégé of Aritomo Yamagata, he served as war minister, then (1901–6) as prime minister. Duri...Browse by Subject
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