SuperTornado: Anatomy of a MegaDisaster

May 22, 2011, the costliest tornado in American history struck Joplin, Missouri, carving a mile-wide swath of destruction and death. Scientists descended on the city to find out what made this tornado so destructive. Follow the people of Joplin as they continue to pick up the pieces and struggle to make sense of it all. Featured by XIVETV.