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chain reaction

(Encyclopedia)CE5 Chain reaction: A neutron (n) strikes the uranium nucleus (U-235), causing it to split into fission products A and B and release two neutrons. These neutrons can in turn cause further fissions....

punctuation

(Encyclopedia)punctuation [Lat.,=point], the use of special signs in writing to clarify how words are used; the term also refers to the signs themselves. In every language, besides the sounds of the words that are ...

Langdell, Christopher Columbus

(Encyclopedia)Langdell, Christopher Columbus lăngˈdəl [key], 1826–1906, American teacher of law, b. New Boston, N.H. He practiced in New York City from 1854 to 1870, when he was appointed Dane professor of law...

Malema, Julius Sello

(Encyclopedia)Malema, Julius Sello, 1981–, South African political leader. Involved in the African National Congress (ANC) from a young age, he rose quickly in its influential Youth League, becoming a regional ch...

Masaryk, Jan

(Encyclopedia)Masaryk, Jan yän mäˈsärĭk [key], 1886–1948, Czechoslovak diplomat, son of Thomas G. Masaryk. He was (1925–38) Czechoslovak minister to Great Britain, and in London he became (1940) foreign mi...

Kocharian, Robert Sedraki

(Encyclopedia)Kocharian or Kocharyan, Robert Sedraki, 1954–, Armenian political leader. He served (1972–74) in the Soviet army and worked as a mechanical engineer (1977–81) before graduating (1982) from the Y...

Knuth, Donald Ervin

(Encyclopedia)Knuth, Donald Ervin no͞oth, kəno͞othˈ [key], 1938–, American mathematician and computer scientist, b. Milwaukee, Wis., grad. Case Institute of Technology (B.S. and M.S., 1960) and California Ins...

Murad, Ferid

(Encyclopedia)Murad, Ferid, 1936–, American pharmacologist, b. Whiting, Ind., M.D., Ph.D. Western Reserve Univ. (now Case Western Reserve Univ.), 1965. Murad taught at the Univ. of Virginia (1975–81), Stanford ...

herbarium

(Encyclopedia)herbarium, collection of dried and mounted plant specimens used in systematic botany. To preserve their form and color, plants collected in the field are spread flat in sheets of newsprint and dried, ...

health-care proxy

(Encyclopedia)health-care proxy, legal document in which a person assigns to another person, usually called an agent or proxy, the authority to make medical decisions in case of incapacitation. It is, in essence, a...