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Ferdinand IV, Spanish king of Castile and León

(Encyclopedia)Ferdinand IV, 1285–1312, Spanish king of Castile and León (1295–1312), son and successor of Sancho IV. His mother, María de Molina, was regent during his turbulent minority. He tried unsuccessfu...

Popper, Sir Karl Raimund

(Encyclopedia)Popper, Sir Karl Raimund, 1902–94, Anglo-Austrian philosopher, b. Vienna. He became familiar with the Vienna circle of logical positivists (see logical positivism) while a student at the Univ. of Vi...

Euler-Chelpin, Hans Karl August Simon von

(Encyclopedia)Euler-Chelpin, Hans Karl August Simon von, 1873–1964, Swedish biochemist, b. Germany, Ph.D. Univ. of Berlin, 1895. He spent his entire career at Stockholm Univ., first as professor and later as dire...

Moltke, Helmuth Karl Bernhard, Graf von

(Encyclopedia)Moltke, Helmuth Karl Bernhard, Graf von, 1800–1891, Prussian field marshal. Following his graduation from the Royal Military Academy of Denmark, he entered the Danish service, but resigned his commi...

Oberth, Hermann Julius

(Encyclopedia)Oberth, Hermann Julius, 1894–1989, Austro-German astronautical pioneer, b. Hermannstadt, Austria-Hungary (now Sibiu, Romania). Beginning his studies in astronautics before World War I, he first prop...

Acosta, Uriel

(Encyclopedia)Acosta, Uriel dä kōˈstä [key], c.1585–1640, Jewish rationalist, b. Oporto, Portugal. His original name was Gabriel da Costa, and his family had been converted to Roman Catholicism. When he reach...

Schwarzenberg, Felix, Fürst zu

(Encyclopedia)Schwarzenberg, Felix, Fürst zu fāˈlĭks fürst tso͞o shvärˈtsənbĕrk [key], 1800–1852, Austrian premier; nephew of Karl Philipp zu Schwarzenberg. A soldier and diplomat, he was named (Nov., 1...

Liebknecht, Wilhelm

(Encyclopedia)Liebknecht, Wilhelm lēpˈkənĕkht [key], 1826–1900, German socialist leader and journalist. His participation in the revolution in Germany in 1848–49 forced him into exile, and he lived in Engl...

American Federation of Teachers

(Encyclopedia)American Federation of Teachers (AFT), an affiliate of the AFL-CIO. It was formed (1916) out of the belief that the organizing of teachers should follow the model of a labor union, rather than that of...

Isabella I

(Encyclopedia)Isabella I or Isabella the Catholic, 1451–1504, Spanish queen of Castile and León (1474–1504), daughter of John II of Castile. In 1469 she married Ferdinand of Aragón (later King Ferdinand II of...