Even small pieces of wreckage from Flight 370 could provide investigators with big clues to the plane's fate. Understanding what the debris reveals is both a science and an art. USC's Aviation Safety and Security Accident Lab teaches students how to find those clues. Stephanie Elam got a lesson from their aviation safety expert Michael Barr.
Anderson Cooper goes beyond the headlines to tell stories from many points of view, so you can make up your own mind about the news. Tune in weeknights at 8 and 10 ET on CNN.
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