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Freetown

(Encyclopedia)Freetown, city (1995 est. pop. 519,500), capital of Sierra Leone, W Sierra Leone, a port on the Atlantic Ocean. Located on the Sierra Leone peninsula, Freetown is the nation's administrative, communic...

Smith, Kiki

(Encyclopedia)Smith, Kiki, 1954–, American sculptor and printmaker, b. Nuremberg, Germany. The daughter of sculptor Tony Smith, she grew up in New Jersey and settled in New York City in 1976. Prolific and essenti...

supersymmetry

(Encyclopedia)supersymmetry, in physics, theory concerning the relationship of the elementary particles called boson to those known as fermions, and vice versa, and linking the four fundamental forces. In supersymm...

city-state

(Encyclopedia)city-state, in ancient Greece, Italy, and Medieval Europe, an independent political unit consisting of a city and surrounding countryside. The first city-states were in Sumer, but they reached their p...

ejido

(Encyclopedia)ejido āhēˈᵺō [key] [Span.,=common land], in Mexico, agricultural land expropriated from large private holdings and redistributed to communal farms. Communal ownership of land had been widely pra...

Northumberland

(Encyclopedia)Northumberland nôrthŭmˈbərlənd [key], county (1991 pop. 300,600), 2,019 sq mi (5,229 sq km), NE England; administratively, Northumberland is a unitary authority (since 2009). Northernmost of the ...

Mont-Saint-Michel

(Encyclopedia)Mont-Saint-Michel môN-săN-mēshĕlˈ [key], rocky isle (1993 est. pop. 72) in the Gulf of Saint-Malo, an arm of the English Channel, Manche dept., NW France, 1 mi (1.6 km) off the coast, near Avranc...

radical, in chemistry

(Encyclopedia)radical, in chemistry, group of atoms that are joined together in some particular spatial structure and that take part in most chemical reactions as a single unit. Important inorganic radicals include...

latent heat

(Encyclopedia)latent heat, heat change associated with a change of state or phase (see states of matter). Latent heat, also called heat of transformation, is the heat given up or absorbed by a unit mass of a substa...

Groves, Leslie Richard

(Encyclopedia)Groves, Leslie Richard, 1896–1970, American army officer and engineer who headed the program that developed America's atomic bomb, b. Albany, N.Y., grad. West Point (1918). He was commissioned in th...