What is a black box, what can it tell us, and have the data recorders been found from Flight 5342 and the Army's Blackhawk?

After the National Transportation Safety Board (NTSB) recovered the black boxes from the downed American Airlines passenger ...

It's one of the most important pieces of forensic evidence following a plane crash: The so-called “black box."There are actually two of these remarkably sturdy devices: the cockpit voice ...