We can’t control stress, but what we can do is understand it. Neuropsychologist Dr. Kamran Fallahpour lets us listen to the sound of our own stress (a sort of a high pitched whine). His theory is that if you can hear your stress you can control it. Not to say all stress is bad: MTV producer Colby Hall battles a boat propellor and survives by virtue of stress hormones. Dr. Robert Sapolsky explains how it works - stress hormones shut down pain, often leaving the victim the calmest person at the scene.