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cerium

(Encyclopedia)cerium sērˈēəm [key] [from the asteroid Ceres], metallic chemical element; symbol Ce; at. no. 58; at. wt. 140.116; m.p. 799℃; b.p. 3,426℃; sp. gr. 6.77 at 25℃; valence +3 or +4. Cerium is a ...

postal service

(Encyclopedia)postal service, arrangements made by a government for the transmission of letters, packages, and periodicals, and for related services. Early courier systems for government use were organized in the P...

induction, in logic

(Encyclopedia)induction, in logic, a form of argument in which the premises give grounds for the conclusion but do not necessitate it. Induction is contrasted with deduction, in which true premises do necessitate t...

Scharnhorst, Gerhard Johann David von

(Encyclopedia)Scharnhorst, Gerhard Johann David von gĕrˈhärt yōˈhän däˈvēt fən shärnˈhôrst [key], 1755–1813, Prussian general. A Hanoverian army officer, military writer, and director of the war coll...

Shiller, Robert James

(Encyclopedia)Shiller, Robert James, 1946–, American economist, b. Detroit, grad. Univ. of Michigan (B.A., 1967), Massachusetts Institute of Technology (S.M., 1968; Ph.D., 1972). A professor at Yale since 1982, S...

social science

(Encyclopedia)social science, term for any or all of the branches of study that deal with humans in their social relations. Often these studies are referred to in the plural as the social sciences. Although human s...

Philadelphia Orchestra

(Encyclopedia)Philadelphia Orchestra, founded 1900 by Fritz Scheel, who was its conductor until his death in 1907. Scheel was followed by Karl Pohlig (1907–12). Under the leadership (1912–38) of Leopold Stokows...

Spartacus party

(Encyclopedia)Spartacus party or Spartacists, radical group of German Socialists, formed c.Mar., 1916, and led by Karl Liebknecht and Rosa Luxemburg. The name was derived from the pseudonym Spartacus used by Liebkn...

Schliemann, Heinrich

(Encyclopedia)Schliemann, Heinrich hīnˈrĭkh shlēˈmän [key], 1822–90, German archaeologist, discoverer of the ruins of Troy. He accumulated a fortune in the indigo trade and as a military contractor and reti...

Planck, Max

(Encyclopedia)Planck, Max mäks plängk [key], 1858–1947, German physicist. Seeking to explain the experimental spectrum (distribution of electromagnetic energy according to wavelength) of blackbody radiation, he...