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Robert M. Sapolsky is the author of four books of popular science: Monkeyluv and Other Essays on Our Lives as Animals (2005), A Primate???s Memoir (2001), The Trouble with Testosterone (1997), all from Scribner; and the bestselling, Why Zebras Don’t Get Ulcers, now in its third edition from Owl Books. A recipient of a MacArthur fellowship, Sapolsky is a professor of biology and neuroscience at Stanford and a research associate with the Institute of Primate Research at the National Museum of Kenya.