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Uploaded on Sep 19, 2008
As we've evolved, the human stress response has saved our lives. Today, we turn on the same life-saving physical reaction to cope with intense, ongoing stressors - and we can't seem to turn it off. Robert Sapolsky, Professor of Neurology and Neurological Sciences at Stanford University, reveals just how dangerous prolonged exposure to stress can be in the documentary, "Stress: Portrait of a Killer."