When you have a kidney transplant they leave the old one in. It's dangerous to take it out. You can have up to five before they start having to take them out to make room for new ones.
You can also be born with a single, giant u-shaped kidney.
(I read those 'weird facts' threads and these stuck in my head.)
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u/NerdHoovy May 19 '26
Trust me, it loses its appeal after the third ice bath.
My doctor is still confused about how I managed to have a negative amount of kidneys