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71Down feather — The down of birds is a layer of fine feathers found under the tougher exterior feathers. Very young birds are clad only in down. Powder down is a specialized type of down found only in a few groups of birds. Down is a fine thermal insulator and… …
72Germany — /jerr meuh nee/, n. a republic in central Europe: after World War II divided into four zones, British, French, U.S., and Soviet, and in 1949 into East Germany and West Germany; East and West Germany were reunited in 1990. 84,068,216; 137,852 sq.… …
73Politics of Russia — The politics of Russia ( the Russian Federation) take place in a framework of a federal presidential republic. According to the Constitution of Russia, the President of Russia is head of state, and of a multi party system with executive power… …
74Shell model — In nuclear physics, the nuclear shell model is a model of the atomic nucleus which uses the Pauli principle to describe the structure of the nucleus in terms of energy levels. The model was developed in 1949 following independent work by several… …
75GeForce 6 Series — Nvidia GeForce 6 Series Codename(s) NV40, NV41, NV42, NV43, NV44, NV45, NV48 Release date April 2004 2005 Entry level GPU 6100 (IGP), 6150 (IGP), 6200, 6500 Mid range GPU 6600, 6700 …
76Clean Water Act — For Clean Water Act of Ontario, Canada, see Clean Water Act (Ontario). Clean Water Act Full title Federal Water Pollution Control Amendments of 1972 Acronym CWA / Clean Water Act Enacted by the 92nd United …
77Seismic retrofit — Seismic retrofitting is the modification of existing structures to make them more resistant to seismic activity, ground motion, or soil failure due to earthquakes. Other retrofit techniques are applicable to areas subject to tropical cyclones,… …
78Fort Peck Dam — The Fort Peck Dam is the highest of six major dams along the Missouri River, located in northeast Montana in the United States, near Glasgow, and adjacent to the community of Fort Peck. At 21,026 feet (6,409 m) in length and over 250 feet (75 m)… …
79Mountaintop removal mining — Mountaintop removal site Mountaintop removal in Martin County, Kentucky M …
80Lake — For other uses, see Lake (disambiguation). Oeschinen Lake in the Swiss Alps A lake is a body of relatively still fresh or salt water of considerable size, localized in a basin, that is surrounded by land. Lakes are inland and not part of the… …
