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Ptolemy

(Encyclopedia)Ptolemy (Claudius Ptolemaeus), fl. 2d cent. a.d., celebrated Greco-Egyptian mathematician, astronomer, and geographer. He made his observations in Alexandria and was the last great astronomer of ancie...

Peirce, Charles Sanders

(Encyclopedia)Peirce, Charles Sanders pûrs [key], 1839–1914, American philosopher and polymath, b. Cambridge, Mass., grad. Harvard, 1859; son of Benjamin Peirce. Except for occasional lectures he renounced the r...

Pestalozzi, Johann Heinrich

(Encyclopedia)Pestalozzi, Johann Heinrich yōˈhän hīnˈrĭkh pĕsˌtälôtˈsē [key], 1746–1827, Swiss educational reformer, b. Zürich. His theories laid the foundation of modern elementary education. He stu...

Eisenhower, Milton Stover

(Encyclopedia)Eisenhower, Milton Stover, 1899–1985, American educator and public official, b. Abilene, Kans., grad. Kansas State College of Agriculture and Applied Science (now Kansas State Univ.), 1924; brother ...

electrochemistry

(Encyclopedia)electrochemistry, science dealing with the relationship between electricity and chemical changes. Of principal interest are the reactions that take place between electrodes and the electrolytes in ele...

Dessoir, Max

(Encyclopedia)Dessoir, Max mäx dĕswär,ˈ [key], 1867–1947, German philosopher. He earned doctorates from the universities of Berlin (philosophy, 1889) and Würtzburg (medicine, 1892). He was a professor at Ber...

Compton, Arthur Holly

(Encyclopedia)Compton, Arthur Holly, 1892–1962, American physicist, b. Wooster, Ohio, grad. College of Wooster (B.S., 1913), Ph.D. Princeton, 1916. He was professor and head of the department of physics at Washin...

Davutoğlu, Ahmet

(Encyclopedia)Davutoğlu, Ahmet, 1959–, Turkish politician. Before entering politics, he taught political science and international relations at Marmara Univ., Beykent Univ., and other institutions. From 2003 to ...

Abdul-Mahdi, Adel

(Encyclopedia)Abdul-Mahdi, Adel, 1942–, Iraqi political leader. Born into a prominent Shiite family, he joined the Ba'ath party in the early 1960s, then left the party and went into self-exile in France in 1969. ...

checkers

(Encyclopedia)checkers, game for two players, known in England as draughts. It is played on a square board, divided into 64 alternately colored—usually red and black or white and black—square spaces, identical ...