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NOVA

S39 Ep10: Deadliest Tornadoes

Aired: 04/10/2012
52:52
Expires: 12/15/2015
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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S39 Ep10: Deadliest Tornadoes

Why was the 2011 tornado season in the U.S. so extreme, and why did so many die?

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