How Do Tornadoes Form? - Instant Egghead #37

Every year tornadoes rip through the U.S. Midwest, leaving death, injury and billions of dollars of damage in their wake. Where do these twisters come from, and just how nasty can they get? Scientific American editor Mark Fischetti reports.

More to explore:

The Science of Tornadoes
http://www.scientificamerican.com/rep...

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