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FILE UNDER: "You've got to be shitting me." I've been wondering about the #Science of people sticking their heads up other people's asses ... but I was never quite sure about it. Wow. [Human Trials Bring Us Closer to Breathing Through Our Butts : ScienceAlert](https://www.sciencealert.com/human-trials-bring-us-closer-to-breathing-through-our-butts)

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