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Meitner, Lise

(Encyclopedia)Meitner, Lise lēˈzə mītˈnər [key], 1878–1968, Austrian-Swedish physicist and mathematician. She was professor at the Univ. of Berlin (1926–33). A refugee from Germany after 1938, she became ...

protactinium

(Encyclopedia)protactinium prōˌtăktĭnˈēəm [key], radioactive chemical element; symbol Pa; at. no. 91; mass number of most stable isotope 231; m.p. greater than 1,600℃; b.p. 4,026℃; sp. gr. 15.37 (calcula...

Villaraigosa, Antonio

(Encyclopedia)Villaraigosa, Antonio vēˌyärīgōˈsä [key], 1953–, American politician, b. Los Angeles as Antonio Villar; he changed his name in 1987 when he married Corina Raigosa. A liberal Democrat and labo...

dubnium

(Encyclopedia)dubnium do͞obˈnēəm [key], artificially produced radioactive chemical element; symbol Db; at. no. 105; mass number of most stable isotope 268; m.p., b.p., and sp. gr. unknown; valence +5. Situated ...

Conrad the Red

(Encyclopedia)Conrad the Red, d. 955, duke of Lotharingia (Lorraine; 944–53). A Franconian adherent of the German king Otto I (later Holy Roman emperor), he was made duke of Lotharingia and married Otto's daughte...

John XII, pope

(Encyclopedia)John XII, c.937–964, pope (955–64), a Roman (count of Tusculum) named Octavian; successor of Agapetus II and predecessor of either Leo VIII or Benedict V. His father, Alberic, secured John's elect...

Eberhard

(Encyclopedia)Eberhard āˈbərhärtˌ [key], d. 939, duke of Franconia; brother of the German king, Conrad I, whom he succeeded as duke. The first to rebel against the centralizing policy of Holy Roman Emperor Ott...

atomic bomb

(Encyclopedia)atomic bomb or A-bomb, weapon deriving its explosive force from the release of nuclear energy through the fission (splitting) of heavy atomic nuclei. The first atomic bomb was produced at the Los Alam...

Lothair, French king

(Encyclopedia)Lothair, 941–86, French king (954–86), son and successor of King Louis IV. During the early part of his reign he was dominated by Hugh the Great. Even after Hugh's death he was involved in conflic...

Berengar II

(Encyclopedia)Berengar II bĕrˈĭng-gər [key], d. 966, marquis of Ivrea. In 950 he made himself and his son joint kings of Italy, but his great unpopularity and his attempt to force Adelaide, his predecessor's wi...