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Scoop.it!
This animation visualizes daily snow cover over North America from July 1, 2009 - March 11, 2012. 
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Scoop.it!
One year after the historic tornado outbreak of April 27-28, 2011, researchers say they've learned a few things about deadly twisters. This week's ScienceCast presents some of the scientific findings that emerged from the swath of destruction.
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