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Killer Stress: A National Geographic Special - Preview

  • Aired: 08/03/2011
  • 00:30
  • Rating: NR
In the beginning, stress saved our lives. It made us run from predators and enabled us to take down prey. But now, scientists are discovering, stress is measurable and dangerous. 8/3/11
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Killer Stress: A National Geographic Special - Preview
Airs Wednesday, August 3, 2011 at 10:00 p.m. ET/PT. Check your local listings.
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