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Steven Pinker, Harvard Professor and Johnstone Family Professor in the Department of Psychology at Harvard University, is photographed at his ocean-front home in Truro, MA. Pinker is best known for his research on language and cognition, and how they've evolved in humans over time. His new book proports that  contrary to popular belief, there has been a steady decline in violence since the beginning of civilization. "Believe it or not, we may be living in the most peaceful era of our species' existence," Pinker says of his research. 9/16/11 Julia Cumes