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Hunt for the Supertwister - Preview
Airs Wednesday, May 9, 2012 at 10:00 p.m. ET/PT. Check your local listings.
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Japan's Killer Quake - Preview
An eyewitness account and investigation of the earthquake, tsunami, and nuclear crisis.
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Great Mammoth Mystery Preview
Sir David Attenborough explores a site with traces of ancient mammoths and Neanderthals.
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Augmented Preview
An ingenious new technology allows prosthetic legs to move and feel like the real thing.
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Determined: Fighting Alzheimer's Preview
Follow three women enrolled in a new study to try to prevent Alzheimer’s.