One year after the historic tornado outbreak of April 27-28, 2011, researchers say they've learned a few things about deadly twisters. Today's story from Science@NASA presents some of the scientific findings that emerged from the swath of destruction.
FULL STORY: http://science.nasa.gov/science-news/science-at-nasa/2012/13apr_april/
VIDEO: http://www.youtube.com/watch?v=WIKAV7B2oTk
