Flutterby™! :

Back in August I ran across a note on what happens when a human gets exposed to vacuum. Larry passes along this article from AVweb (registration required to read, but it's free) on the physiology of humans at high altitudes that's interesting even to us non-pilots who just spend a bit of time up in the mountains:

"We spend many hours in our carefully conditioned cockpits, only inches from an environment that is incompatible with life. We sit in shirtsleeves, comfortably oblivious to the frigid and rare atmosphere through which our fragile shell moves. Rarely do we think about the temperature outside or the time available to react should our carefully maintained environment fail."