EditorialProf. Saul Kripke during a lecture called "The first person" at the Graduate Center of the City University of New York, on Jan. 26, 2006. (Fred R. Conrad/The New York Times)
EditorialItaly: Central detail from 'The School of Athens', featuring Greek philosophers Plato (red robe) and Aristotle (blue robe). Raphael (1483 - 1520), painted between 1509–1511 (Apostolic Palace, Vatican City)