Mount Everest, earth’s highest peak, is 29,028 feet tall. If it were much higher, you couldn’t climb it without wearing a spacesuit. At around 35,000 feet, even inhaling 100 percent pure oxygen won’t suffice to keep you alive. Why? Because the extremely low pressure at that altitude lets nitrogen bubbles enter your bloodstream (the phenomenon deep-sea divers call the bends), which leads to embolisms and sometimes death.
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