Humans are one of the few creatures on this planet who have the capability of ignoring our basic survival instinct. We jump out of perfectly good airplanes — something that still sets off alarms in the most veteran skydivers — and we push ourselves to the edge of death and back with physical demands on our bodies that defy reason with activities like ultra-marathons in the desert, living in microgravity, and setting the world record for holding one’s breath under water.
Yet as contradictory as it sounds, testing these limits is probably what m

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