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Tlaxcala , state, Mexico

(Encyclopedia)Tlaxcala tläskäˈlä [key], state (1990 pop. 761,277), 1,555 sq mi (4,027 sq km), E central Mexico. Tlaxcala is the capital. It is the smallest and one of the most densely populated Mexican states. ...

touch

(Encyclopedia)touch, tactile sensation received by the skin, enabling the organism to detect objects or substances in contact with the body. End organs (nerve endings) in the skin convey the impression to the brain...

sodium sulfate

(Encyclopedia)sodium sulfate, chemical compound, Na2SO4. It is a white, orthorhombic crystalline compound at ordinary temperatures; above 100℃ it assumes a monoclinic structure, and above about 250℃ it assumes ...

sense

(Encyclopedia)sense, faculty by which external or internal stimuli are conveyed to the brain centers, where they are registered as sensations. Sensory reception occurs in higher animals through a process known as t...

polar front

(Encyclopedia)polar front, zone of transition between polar and tropical air masses. Its average position during the winter is at about 30° lat. and during the summer at about 60° lat. In the N Atlantic Ocean, fo...

Carrier, Willis Haviland

(Encyclopedia)Carrier, Willis Haviland, 1876–1950, American engineer who played a key role in inventing air conditioning, b. Angola, N.Y., grad. Cornell (M.E. 1901). Working for the Buffalo Forge Co. (1901–14),...

Pauling, Linus Carl

(Encyclopedia)Pauling, Linus Carl pôˈlĭng [key], 1901–94, American chemist, b. Portland, Oreg. He was one of the few recipients of two Nobel Prizes, winning the chemistry award in 1954 and the peace prize in 1...

Brezhnev, Leonid Ilyich

(Encyclopedia)Brezhnev, Leonid Ilyich lāyōnēdˈ ĭlyēchˈ brĕzhˈnĕf [key], 1906–82, Soviet leader. He joined (1931) the Communist party and rose steadily in its hierarchy. In 1952 he became a secretary of ...

Karelia

(Encyclopedia)Karelia kərēˈlēə [key], constituent republic (1990 pop. 800,000), 66,409 sq mi (172,300 sq km), NW European Russia, extending from the Finnish border in the west to the White Sea in the east and ...

Castlereagh, Robert Stewart, 2d Viscount

(Encyclopedia)Castlereagh, Robert Stewart, 2d Viscount kăˈsəlrā [key], 1769–1822, British statesman, b. Ireland. Entering the Irish Parliament in 1790 and the British Parliament in 1794, he was acting chief s...