/u/Diseased-Jackass's posts in /r/askscience
Why does human head hair have a really long maximum growth length? (I believe the limit is to the waist?) What is the evolutional advantage of this?
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I’ve heard some people are born with a genetic disorder where they cannot feel pain, my question is is their an opposite disorder? Like the person is born with every pain receptor they have firing at 100% all the time of their miserable existence?
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If I got a needle 1 atom thick and stabbed myself through the heart with it, would it hurt or harm me? How thick would it have to be to be noticeable or harmful?
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