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Shannon, Claude Elwood

(Encyclopedia)Shannon, Claude Elwood, 1916–2001, American applied mathematician, b. Gaylord, Michigan. A student of Vannevar Bush at the Massachusetts Institute of Technology (MIT), he was the first to propose th...

Derry, city, Northern Ireland

(Encyclopedia)Derry lŭnˌdəndĕrˈē, lŭnˈdəndĕrˌē [key] city and district, NW Northern Ire...

Erdös, Paul

(Encyclopedia)Erdös, Paul ĕrˈdös [key], 1913–96, Hungarian mathematician, b. Budapest. A child prodigy, he was mostly home-schooled by his parents—both teachers of mathematics—until he entered the Univ. o...

Port Said

(Encyclopedia)Port Said bo͝or [key], city (1986 pop. 469,533), NE Egypt, a port on the Mediterranean Sea at the entrance to the Suez Canal. It is a fueling point for ships using the canal and is the site of the ma...

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...

pi

(Encyclopedia)pi, in mathematics, the ratio of the circumference of a circle to its diameter. The symbol for pi is π. The ratio is the same for all circles and is approximately 3.1416. It is of great importance in...

plastic surgery

(Encyclopedia)plastic surgery, surgical repair of congenital or acquired deformities and the restoration of contour to improve the appearance and function of tissue defects. Development of this specialized branch o...

wind tunnel

(Encyclopedia)wind tunnel, apparatus for studying the interaction between a solid body and an airstream. A wind tunnel simulates the conditions of an aircraft in flight by causing a high-speed stream of air to flow...

xerography

(Encyclopedia)xerography zərŏgˈrəfēˌ [key], also called electrophotography, method of dry photocopying in which the image is transferred by using the attractive forces of electric charges. A beam of light, us...

Bengaluru

(Encyclopedia)Bengaluru băng-gəlôrˈ [key], city (2021 pop. 5,104,047; est. pop. metropolitan area 12,327,000), ...