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Laguna District

(Encyclopedia) Laguna District [Span.,=lake], irrigated area in E Durango and W Coahuila states, N central Mexico. Originally a 900,000-acre (364,200-hectare) tract, consisting of large estates, the…

nuclear winter

(Encyclopedia) nuclear winter, theory holding that the smoke and dust produced by a large nuclear war would result in a prolonged period of cold on the earth. The earliest version of the theory,…

silicosis

(Encyclopedia) silicosissilicosissĭlĭkōˈsĭs [key], occupational disease of the lungs caused by inhalation of free silica (quartz) dust over a prolonged period of time. Free silica is dispersed in the…

psittacosis

(Encyclopedia) psittacosispsittacosissĭtəkōˈsĭs [key] or parrot fever, infectious disease caused by the species of Chlamydia psittaci and transmitted to people by birds, particularly parrots,…

Benét, William Rose

(Encyclopedia) Benét, William Rose, 1886–1950, American poet and editor, b. Brooklyn, grad. Yale, 1907; brother of Stephen Vincent Benét. He was associated as editor or assistant editor with the…

stellar populations

(Encyclopedia) stellar populations, two broadly contrasting distributions of star types that are characteristic of different parts of a galaxy. Population I stars are young, recently formed stars,…

compressed air

(Encyclopedia) compressed air, air whose volume has been decreased by the application of pressure. Air is compressed by various devices, including the simple hand pump and the reciprocating, rotary,…

Mars, in astronomy

(Encyclopedia) Mars, in astronomy, 4th planet from the sun, with an orbit next in order beyond that of the earth. Mars has two natural satellites, discovered by Asaph Hall in 1877. The innermost…