Authorities are searching for answers as to why a Learjet 55 medical plane fell out of the sky in a violent crash Friday over Northeast Philly.

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 ...

In contrast to other stage layouts (such as traditional theaters with fixed stages), black box spaces allow for endless stage configurations, giving productions the freedom to shape the ...