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Yosemite National Park

(Encyclopedia)Yosemite National Park yōsĕmˈĭtē [key], 748,436 acres (302,881 hectares), E central Calif.; est. 1890 as a result of the efforts of conservationist John Muir. Located in the Sierra Nevada, it is ...

Kejimkujik National Park

(Encyclopedia)Kejimkujik National Park kĕjˌəmko͞oˈjĭk, kĕjˌməko͞ojˈ [key], 140 sq mi (363 sq km), S central N.S., Canada, near Maitland Bridge; est. 1968. The park has a rolling landscape with numerous l...

Yellowstone National Park

(Encyclopedia)Yellowstone National Park, 2,219,791 acres (899,015 hectares), the world's first national park (est. 1872), NW Wyo., extending into Montana and Idaho. It lies mainly on a broad plateau in the Rocky Mt...

Kluane National Park

(Encyclopedia)Kluane National Park klo͞oānˈ [key], c.8,500 sq mi (22,000 sq km), SW Yukon, Canada, between Kluane Lake and the British Columbia and Alaska borders; est. 1972. Located in the St. Elias Mts., the p...

Audubon Society, National

(Encyclopedia)Audubon Society, National, one of the oldest and best-known U.S. environmental organizations; founded 1886 by George Cird Grinnell and named for John James Audubon. The nonprofit organization, which h...

Argonne National Laboratory

(Encyclopedia)Argonne National Laboratory, research center, based in Argonne, Ill., 27 mi (43 km) SW of downtown Chicago, with other facilities at the Idaho National Engineering Laboratory, 50 mi (80 km) W of Idaho...

Pukaskwa National Park

(Encyclopedia)Pukaskwa National Park pŭkˈăskwə [key], c.725 sq mi (1,890 sq km), central Ont., Canada, near Marathon; est. 1971. Stretching for c.50 mi (80 km) along the north shore of Lake Superior between the...

Canyonlands National Park

(Encyclopedia)Canyonlands National Park, 337,598 acres (136,679 hectares), SE Utah; est. 1964. Located in a desert region, the park contains a maze of deep canyons and many unusual features carved by wind and water...

National Symphony Orchestra

(Encyclopedia)National Symphony Orchestra (NSO), Washington, D.C., founded in 1931 by Hans Kindler, who conducted the orchestra until 1949. Its first home was Constitution Hall; since 1986 it has been affiliated wi...

ether, in physics and astronomy

(Encyclopedia)ether or aether, in physics and astronomy, a hypothetical medium for transmitting light and heat (radiation), filling all unoccupied space; it is also called luminiferous ether. In Newtonian physics a...