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Royal Academy of Arts

(Encyclopedia)Royal Academy of Arts, London, the national academy of art of England, founded in 1768 by George III at the instigation of Sir William Chambers and Benjamin West. Sir Joshua Reynolds was the Academy's...

Orbiting Geophysical Observatory

(Encyclopedia)Orbiting Geophysical Observatory (OGO), series of six orbiting observatories (see observatory, orbiting) launched between 1964 and 1969 by the National Aeronautics and Space Administration (NASA) to s...

Fontane, Theodor

(Encyclopedia)Fontane, Theodor tāˈōdôr fôntäˈnə [key], 1819–98, German writer. Although he is primarily important as a novelist, he did not begin to write fiction until he was almost 60 years old. Thereaf...

Mammoth Cave National Park

(Encyclopedia)Mammoth Cave National Park, 52,830 acres (21,396 hectares), central Kentucky, authorized 1926, est. 1941. Located in a hilly, forested region, it offers numerous outdoor activities. It is the site of ...

McDonagh, Martin

(Encyclopedia)McDonagh, Martin məkdŭnˈə [key], 1970–, Anglo-Irish playwright, b. London to Irish parents. During summer visits he became acquainted with W Ireland, and without any formal training he wrote a s...

decompression sickness

(Encyclopedia)decompression sickness, physiological disorder caused by a rapid decrease in atmospheric pressure, resulting in the release of nitrogen bubbles into the body tissues. It is also known as caisson disea...

spark chamber

(Encyclopedia)spark chamber, in physics, device for recording the passage of elementary particles produced by reactions in a particle accelerator. Particles pass through a stack of metal plates or wire grids that a...

Perugia

(Encyclopedia)Perugia pāro͞oˈjä [key], city (1991 pop. 144,732), capital of Umbria and of Perugia prov., central Italy, situated on a hill overlooking the valley of the Tiber River. It is a commercial, industri...

vase

(Encyclopedia)vase, vessel of pottery, glass, metal, stone, wood, or synthetic material. The pottery vase was anciently employed as a container for water (a hydria), wine and other products (an amphora), or oil (a ...

Botha, Pieter Willem

(Encyclopedia)Botha, Pieter Willem pēˈtər vĭlˈəm bōˈtə [key], 1916–2006, South African political leader. An Afrikaner and a member of the right-wing National party, he first entered parliament in 1948. B...