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dark matter
(Encyclopedia)dark matter, material that is believed to make up nearly 27% of the mass of the universe but is not readily visible because it neither emits nor reflects electromagnetic radiation, such as light or ra...Franklin, Sir John
(Encyclopedia)Franklin, Sir John, 1786–1847, British explorer in N Canada whose disappearance caused a widespread search of the Arctic. Entering the navy in 1801, he fought in the battle of Trafalgar. On his firs...Vicksburg campaign
(Encyclopedia)Vicksburg campaign, in the American Civil War, the fighting (Nov., 1862–July, 1863) for control of the Mississippi River. The Union wanted such control in order to split the Confederacy and to resto...zirconium
(Encyclopedia)zirconium zərkōˈnēəm [key], metallic chemical element; symbol Zr; at. no. 40; at. wt. 91.224; m.p. about 1,852℃; b.p. 4,377℃; sp. gr. 6.5 at 20℃; valence +2, +3, or +4. Zirconium is a very ...Bank of the United States
(Encyclopedia)Bank of the United States, name for two national banks established by the U.S. Congress to serve as government fiscal agents and as depositories for federal funds; the first bank was in existence from...silverwork
(Encyclopedia)silverwork, utilitarian objects and works of art created from silver. Silverwork includes ecclesiastical and domestic plate, flatware, jewelry, buttons, buckles, boxes, toilet articles, weapons, furni...Rhine
(Encyclopedia)Rhine rīn [key], Du. Rijn, Fr. Rhin, Ger. Rhein, Lat. Rhenus, principal river of Europe, c.820 mi (1,320 km) long. It rises in the Swiss Alps and flows generally north, passing through or bordering o...Azerbaijan, region, Iran
(Encyclopedia)Azerbaijan äˌzĕrbījänˈ, ăˌzər– [key], Iran. Azarbayejan, region, c.34,280 sq mi (88,785 sq km), NW Iran, divided into the provinces of East Azerbaijan, ...Pentecostalism
(Encyclopedia)Pentecostalism, worldwide 20th–21st-century Christian movement that emphasizes the experience of Spirit baptism, generally evidenced by speaking in tongues (glossolalia). The name derives from Pente...Darwin, Charles Robert
(Encyclopedia)Darwin, Charles Robert, 1809–82, English naturalist, b. Shrewsbury; grandson of Erasmus Darwin and of Josiah Wedgwood. He firmly established the theory of organic evolution known as Darwinism. He st...Browse by Subject
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