Wrong Analogy

"So you see where Baker figured wrong. He figured that if the amount of oxygen here is the equivalent of what exists at 27,000 feet, on Earth, then the survival time here ought to be the same as at 27,000 feet. But the analogy is wrong. At 27,000 feet above Earth, the atmospheric pressure is so light that whatever oxygen is in your blood bubbles out pretty fast. But here, where we have normal pressure, the atmosphere is pushing in on us a lot harder and keeps the oxygen in the blood longer. You follow me?

"Anyway, I put all this to Doc Lurie last night and he said I must be right. So he got out some of his books and did some figuring, and what he came up with was this: If we rested—didn't move—while we breathed from our packs, getting our blood a hundred percent saturated, then we could take off the packs and go as long as fourteen or fifteen minutes before we keeled over. Long enough to convince that old buzzard that

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