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Why was the 2011 tornado season in the U.S. so extreme, and why did so many die?
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Follow the story of twin girls joined at the head, as surgeons prepare to separate them.

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It contains 99.9 percent of all the matter in our solar system and sheds hot plasma at...
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NOVA  ·  Episode 3909

Cracking Your Genetic Code

03/27/2012

We are on the brink of a new era of personalized, gene-based medicine. Are we ready for it?

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