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Young, Thomas

(Encyclopedia)Young, Thomas, 1773–1829, English physicist, physician, and Egyptologist. He established (1799) a medical practice in London and was elected (1811) to the staff of St. George's Hospital there. His l...

Zanzibar, city, Tanzania

(Encyclopedia)Zanzibar zănˈzĭbär, zănzĭbärˈ [key] or Stone Town, city (2012 pop. 223,033), capital of the semiautonomous archipelago of Zanzibar and of Zanzibar West region, Tanzania, on the west coast of Z...

Bezos, Jeffrey Preston

(Encyclopedia)Bezos, Jeffrey Preston bāˈzōs [key], 1964– American business executive and on-line retailing pioneer, b. Albuquerque, N.M., grad. Princeton (B.S.E., 1986). He worked in computer technology for se...

energy

(Encyclopedia)CE5 Relations between potential energy (PE) and kinetic energy (KE) for a swinging pendulum energy, in physics, the ability or capacity to do work or to produce change. Forms of energy include hea...

Limerick, city, Republic of Ireland

(Encyclopedia)Limerick, city (1991 pop. 56,083), seat of Co. Limerick, SW Republic of Ireland, at the head of the Shannon estuary. The city has a port with two docks. The primary imports are grain, timber, and coal...

limestone

(Encyclopedia)limestone, sedimentary rock wholly or in large part composed of calcium carbonate. It is ordinarily white but may be colored by impurities, iron oxide making it brown, yellow, or red and carbon making...

National Road

(Encyclopedia)National Road, U.S. highway built in the early 19th cent. At the time of its construction, the National Road was the most ambitious road-building project ever undertaken in the United States. It final...

Andre, Carl

(Encyclopedia)Andre, Carl änˈdrā [key], 1935–, American sculptor, b. Quincy, Mass. A student of Patrick Morgan and associate of Frank Stella, Andre produces sculptures of elemental form and abstract monumental...

Great Limpopo Transfrontier Park

(Encyclopedia)Great Limpopo Transfrontier Park, c.13,500 sq mi (35,000 sq km; roughly the size of Belgium), the largest multinational park in S Africa and one of the largest parks in the world, in NE South Africa, ...

Great Wall of China

(Encyclopedia)Great Wall of China, series of fortifications, c.3,890 mi (6,260 km) long (not including trenches and natural defensive barriers), winding across N China from Gansu prov. to Liaoning prov. The wall, r...