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NOVA

Deadliest Tornadoes

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  • Aired: 04/11/2012
  • 52:52
  • Rating: TV-PG
Why was the 2011 tornado season in the U.S. so extreme, and why did so many die?
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Deadliest Tornadoes
Why was the 2011 tornado season in the U.S. so extreme, and why did so many die?
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