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Akkad

(Encyclopedia)Akkad ăˈkăd, äˈkäd [key], ancient region of Mesopotamia, occupying the northern part of later Babylonia. The southern part was Sumer. In both regions city-states had begun to appear in the 4th m...

Khatami, Mohammad

(Encyclopedia)Khatami, Mohammad khätˈämē [key], 1943–, Iranian religious and political leader. From a prominent clerical family, Khatami opposed the regime of Muhammad Reza Shah Pahlevi in the 1960s and 70s, ...

fiddler crab

(Encyclopedia)fiddler crab, common name for small, amphibious crabs belonging to the genus Uca. They are characterized by a rectangular carapace (shell) and a narrow abdomen, which is flexed under the body. They ar...

neutron

(Encyclopedia)neutron, uncharged elementary particle of slightly greater mass than the proton. It was discovered by James Chadwick in 1932. The stable isotopes of all elements except hydrogen and helium contain a n...

sonar

(Encyclopedia)sonar sōˈnär [key], device used underwater for locating submerged objects and for submarine communication by means of sound waves. The term sonar is an acronym for sound navigation ranging. The mai...

South Sea Bubble

(Encyclopedia)South Sea Bubble, popular name in England for the speculation in the South Sea Company, which failed disastrously in 1720. The company was formed in 1711 by Robert Harley, who needed allies to carry t...

Beach Boys, The

(Encyclopedia)Beach Boys, The, American rock music band formed in 1961 by brothers Brian Wilson, 1942–, Dennis Wilson, 1944–83, and Carl ...

Mather, Cotton

(Encyclopedia)Mather, Cotton măᵺˈər [key], 1663–1728, American Puritan clergyman and writer, b. Boston, grad. Harvard (B.A., 1678; M.A., 1681); son of Increase Mather and grandson of Richard Mather and of Jo...

Heisenberg, Werner

(Encyclopedia)Heisenberg, Werner vĕrˈnər hīˈzənbĕrk [key], 1901–76, German physicist. One of the founders of the quantum theory, he is best known for his uncertainty principle, or indeterminacy principle, ...

neutrino astronomy

(Encyclopedia)neutrino astronomy, study of stars by means of their emission of neutrinos, fundamental particles that result from nuclear reactions and are emitted by stars along with light. Approximately 100 billio...