/u/[deleted]'s posts in /r/askscience
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If the reason testicles are kept outside the body is that sperm can't survive at the body's internal temperature of 37C/98F, why do people who live in places where the ambient temperature is routinely higher than that have no trouble breeding?
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How do doctors know if someone's depression has physiological causes or it's a result of something else, like trauma etc.?
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Potentially a stupid question but does inbreeding affect wild animals as negatively as it does humans?
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