“the atmosphere of the Earth is deadly. You don’t realize it, but oxygen is a corrosive gas. It’s in the same chemical family as chlorine and fluorine, and hydrofluoric acid is the most corrosive acid known. The same quality of oxygen that makes a half-eaten apple turn brown, or makes iron rust, is incredibly destructive to the human body if exposed to too much of it. Oxygen under pressure is toxic—with a vengeance. So we cut down the amount of oxygen you breathe. You breathe twenty-one percent oxygen at the surface. Down here, you breathe two percent oxygen. But you won’t notice any
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