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Valencia, autonomous community, Spain

(Encyclopedia)Valencia välānˈthēä [key], autonomous community (2011 pop. 5,009,931), 8,980 sq mi (23,257 sq km), and former kingdom, E Spain, on the Mediterranean. It now comprises the provinces of Alicante/Al...

promethium

(Encyclopedia)promethium prōmēˈthēəm [key], artificially produced radioactive chemical element; symbol Pm; at. no. 61; mass no. of most stable isotope 145; m.p. 1,042℃; b.p. 3,000℃ (estimated); sp. gr. unk...

Douglas-Home, Alexander Frederick, Baron Home of the Hirsel

(Encyclopedia)Douglas-Home, Alexander Frederick, Baron Home of the Hirsel dŭgˈləs-hyo͞om [key], 1903–95, British politician. Educated at Eton and Oxford, he was elected to the House of Commons in 1931 as a Co...

supercomputer

(Encyclopedia)supercomputer, a state-of-the-art, extremely powerful computer capable of manipulating massive amounts of data in a relatively short time. Supercomputers are very expensive and are employed for specia...

Zagreb

(Encyclopedia)Zagreb zäˈgrĕb [key], Ger. Agram, Hung. Zágráb, city (2011 pop. 790,017), capital and largest city of Croatia, on the Sava River. Zagreb is Croatia's largest industrial, manufacturing, and financ...

hydrogen

(Encyclopedia)hydrogen hīˈdrəjən [key] [Gr.,=water forming], gaseous chemical element; symbol H; at. no. 1; interval in which at. wt. ranges 1.00784–1.00811; m.p. −259.14℃; b.p. −252.87℃; density 0.08...

Tennessee Valley Authority

(Encyclopedia)Tennessee Valley Authority (TVA), independent U.S. government corporate agency, created in 1933 by act of Congress; it is responsible for the integrated development of the Tennessee River basin. The h...

seismology

(Encyclopedia)seismology sīzmŏlˈəjē, sīs– [key], scientific study of earthquakes and related phenomena, including the propagation of waves and shocks on or within the earth by natural or artificially genera...

microprocessor

(Encyclopedia)microprocessor, integrated circuit containing the arithmetic, logic, and control circuitry required to interpret and execute instructions from a computer program. When combined with other integrated c...

Rumsfeld, Donald Henry

(Encyclopedia)Rumsfeld, Donald Henry, 1932–2021, American government official, b. Chicago, Princeton Univ. (B.A., 1954). After graduating college, Rumsfeld enliste...