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tritium

(Encyclopedia)tritium trĭtˈēəm [key], radioactive isotope of hydrogen with mass number 3. The tritium nucleus, called a triton, contains one proton and two neutrons. It has a half-life of 12.5 years and decays ...

Purcell, Edward Mills

(Encyclopedia)Purcell, Edward Mills, 1912–97, American physicist, b. Taylorville, Ill., Ph.D. Harvard, 1938. During World War II, Purcell was a researcher at the Massachusetts Institute of Technology Radiation La...

Organization for Economic Cooperation and Development

(Encyclopedia)Organization for Economic Cooperation and Development (OECD), international organization that came into being in 1961. It superseded the Organization for European Economic Cooperation, which had been ...

Gaitskell, Hugh Todd Naylor

(Encyclopedia)Gaitskell, Hugh Todd Naylor gātˈskəl [key], 1906–63, British statesman. Educated at Oxford, he taught economics at the Univ. of London. During World War II he was a civil servant in the new minis...

Gambier Islands

(Encyclopedia)Gambier Islands gămˈbĭr [key], volcanic islands (6 sq mi/15.5 sq km), South Pacific, near the ...

Bryansk

(Encyclopedia)Bryansk brēänskˈ [key], city (2020 est. pop. 399,000), capital of Bryansk region, central ...

Bushehr

(Encyclopedia)Bushehr –shĭrˈ [key], city, SW Iran, on the Persian Gulf. It is one of the chief ports of ...

Yang, Chen-ning

(Encyclopedia)Yang, Chen-ning chĕn-nĭng yäng [key], 1922–, American physicist, b. China, Ph.D. Univ. of Chicago, 1948. Yang was a member of the Institute for Advanced Study at Princeton, N.J. from 1949 to 1955...

cataract

(Encyclopedia)cataract, in medicine, opacity of the lens of the eye, which impairs vision. In the young, cataracts are generally congenital or hereditary; later they are usually the result of degenerative changes b...

Bevan, Aneurin

(Encyclopedia)Bevan, Aneurin ənīˈrĭn bĕˈvən [key], 1897–1960, British political leader. A coal miner and trade unionist, he served (1929–60) in Parliament as a member of the Labour party. As minister of ...