NOVA: Deadliest Tornadoes [DVD] [2012]

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NOVA: Deadliest Tornadoes
The science behind the April 2011 tornado outbreak in the U.S., which saw more than 360 people killed from hundreds of twisters, is examined. Included: what caused the tornadoes and whether the tornado-prediction process can be improved. ~ Jeff Gemmill, Rovi

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