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?

NASA's two stuck astronauts are taking their first spacewalk together, exiting the International Space Station almost eight ...

A jet with 60 passengers and four crew members aboard collided with an Army helicopter while landing at Ronald Reagan National Airport near Washington, prompting a large search-and-rescue operation in ...