Time is running out for the locator pings coming from Flight 370's black boxes. Searchers have about 13 days until the locator “pings” could go silent on the black boxes. They could use some high-tech, highly sensitive microphones originally designed to locate enemy submarines. Stephanie Elam demonstrates how they work.
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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