Anchored by Jake Tapper, The Lead airs at 4 p.m. ET on CNN.
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(CNN) – It's a desperate time for search crews now racing to rediscover signals that may be coming from the data recorders of Malaysia Airlines Flight 370.
Those so-called black boxes are something heard about after every plane crash; the flight data and cockpit voice recorders hold the answers to some of the biggest mysteries of modern times.
Quite often, they are the only survivors among the wreckage.
CNN's Jake Tapper reports.