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Zoellick, Robert Bruce

(Encyclopedia)Zoellick, Robert Bruce zĕlˈlĭk [key], 1953–, U.S. government official and finance executive, b. Evergreen Park, Ill., grad. Swarthmore College (B.A., 1975), Harvard (J.D., M.P.P. 1981). As an ass...

nucleosynthesis

(Encyclopedia)nucleosynthesis or nucleogenesis, in astronomy, production of all the chemical elements from the simplest element, hydrogen, by thermonuclear reactions within stars, supernovas, and in the big bang at...

Defense, United States Department of

(Encyclopedia)Defense, United States Department of, executive department of the federal government charged with coordinating and supervising all agencies and functions of the government relating directly to nationa...

flerovium

(Encyclopedia)flerovium, artificially produced radioactive chemical element; symbol Fl; at. no. 114; mass number of most stable isotope 289; m.p., b.p., sp. gr., and valence unknown. Situated in Group 14 of the per...

strontium

(Encyclopedia)strontium strŏnˈshēəm [key] [from Strontian, a Scottish town], a metallic chemical element; symbol Sr; at. no. 38; at. wt. 87.62; m.p. 769℃; b.p. 1,384℃; sp. gr. 2.6 at 20℃; valence +2. Stro...

stellar evolution

(Encyclopedia)CE5 The above Hertzsprung-Russell (H-R) diagram shows the track of stellar evolution for a typical star. After spending much of its life evolving toward or along the main sequence, the star becomes...

Lafontaine, Oskar

(Encyclopedia)Lafontaine, Oskar, 1943–, German politician. He rose through the Social Democrat Party (SPD) and electoral ranks in the Saar, becoming SPD regional chairman in 1977 and premier of the Saar in 1985. ...

magnetic resonance imaging

(Encyclopedia)magnetic resonance imaging (MRI), noninvasive diagnostic technique that uses nuclear magnetic resonance to produce cross-sectional images of organs and other internal body structures. The patient lies...

Shultz, George Pratt

(Encyclopedia)Shultz, George Pratt, 1920–2021, American public official, b. New York City, grad. Princeton Univ. (Ph.D., 1942), Massachusetts Institute of Technolog...

Shushkevich, Stanislav Stanislavovich

(Encyclopedia)Shushkevich, Stanislav Stanislavovich, Belarusian Stanislau Stanislavavich Shushkevich, 1934–, Belarusian political leader and scientist, first head of state of independent Belarus after the dissolu...