At first glance, it sounds like science fiction. Or worse, internet nonsense. The idea that humans could absorb oxygen through their intestines feels like a misunderstanding of basic biology, the kind of claim you expect to collapse under even mild scrutiny. And yet, it didn’t collapse. It passed animal trials. It passed human trials. And in carefully controlled clinical settings, it has already kept people alive when their lungs could not. What scientists have done is not replace breathing...