John’s 632-mph ride came to a stop in just 1.4 seconds. When it was over, he had suffered a few broken ribs, a pair of busted wrists, and windburn on his face. The blood vessels in his eyes burst, the retinas detached from the force of the stop, and he went blind for 45 minutes, wondering if his sight would ever return. Still, he was alive, and he walked away from the test with a smile, knowing that humans could survive an impact of 40 Gs or more without dying.
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