It has been four weeks since Flight 370 vanished. Today there are 13 aircraft and eleven ships searching. There is a new focus on the underwater search. High tech equipment from the U.S. is listening for 'pings' from the plane's black boxes. Randi Kaye takes a look at the high tech tools being used in the search.
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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