I think the reason some people might believe this claim is because we're taught in school that the moon's gravity causes the tides. I think the reasoning goes, "well if the moon's gravity can affect the tides, surely it can affect smaller things too"

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[–] 23 points 3 years ago (1 child)

Take an inflatable swimming pool, let it sit outside. Notice any tide? No? Well, why would your kidneys have tides then?

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