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smog

(Encyclopedia)smog smŏg [key] [smoke+fog], dense, visible air pollution. Smog is commonly of two types. The gray smog of older industrial cities like London and New York derives from the massive combustion of coal...

Missouri, river, United States

(Encyclopedia)Missouri, river, c.2,565 mi (4,130 km) long (including its Jefferson-Beaverhead-Red Rock headstream), the longest river of the United States and the principal tributary of the Mississippi River. The l...

Myers, Richard Bowman

(Encyclopedia)Myers, Richard Bowman, 1942–, American Air Force general, b. Kansas City, Mo. He studied at Kansas State Univ., graduating and joining the Air Force in 1965; he later attended Auburn Univ. (M.A., 19...

Yost, Ed

(Encyclopedia)Yost, Ed (Paul Edward Yost), 1919–2007, American balloonist, b. Bristow, Iowa, grad. Boeing School of Aeronautics, 1940. The father of modern hot-air ballooning, Yost pioneered the used of propane (...

Vickrey, William Spencer

(Encyclopedia)Vickrey, William Spencer, 1914–96, Canadian economist, b. Victoria, B.C., Ph.D. Columbia, 1947. He was on the faculty of Columbia from 1946 until his death. In 1996 he and James Mirrlees shared the ...

Verrazzano-Narrows Bridge

(Encyclopedia)Verrazzano-Narrows Bridge, vehicular suspension bridge, New York City, across the Narrows at the entrance to New York harbor, linking the boroughs of Brooklyn and Staten Island. Designed by O. H. Amma...

pneumatic tool

(Encyclopedia)pneumatic tool no͝omătˈĭk [key], instrument activated by air pressure. Pneumatic tools are designed around three basic devices: the air cylinder, the vane motor, and the sprayer. The air cylinder ...

dysprosium

(Encyclopedia)dysprosium dĭsprōˈzēəm [key] [Gr.,=hard to get at], metallic chemical element; symbol Dy; at. no. 66; at. wt. 162.500; m.p. 1,412℃; b.p. 2,562℃; sp. gr. 8.54 at 25℃; valence+3. Dysprosium i...

europium

(Encyclopedia)europium yo͝orōˈpēəm [key] [from Europe], metallic chemical element; symbol Eu; at. no. 63; at. wt. 151.964; m.p. about 820℃; b.p. about 1,600℃; sp. gr. 5.25 at 25℃; valence +2 or +3. Europ...

Mubarak, Muhammad Hosni

(Encyclopedia)Mubarak, Muhammad Hosni hōsˈnē mo͞obəˈrək [key], 1928–2020, president of Egypt (1981–2011). Air force commander (1972–75) and vice president (1975–81) of Egypt, he became president afte...