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Survival at high altitude

News reports state that MH370 flew at 45,000 feet for 23 minutes, and, assuming the cabin was no longer pressurized, that would have caused unconsciousness in the passengers. Based on this, what, if ...
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Could light/occasional smoking strengthen the lungs?

Here's my thought process, correct me where I'm wrong. It seems the human body has thresholds. Examples: You lift too much weight, and the muscles and tendons risk serious injury, but otherwise ...