Mount Everest climbers show survival on record-low oxygen

It's no secret that scaling Mount Everest tests the limits of human survival; more than 200 people have died trying to reach its summit. Today we have new information about just how seriously climbers push their bodies on the world's highest peak: Those who manage to stay alive do so on an amount of oxygen so minute that, at sea level, would only be seen in people who were in cardiac arrest or dead.
Mount Everest climbers show survival on record-low oxygen