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Doctors have successfully implanted laboratory-grown kidneys, noses and vaginas.
Iran is the only country in the world where it is legal to sell your kidneys. The government regulates the market.
The skin is 64% water, muscles and kidneys are 79%, and even the bones are watery: 31%.
Cat kidneys are so efficient they can rehydrate by drinking seawater.
1 in 5 kidneys donated in the U.S. are thrown away because a suitable recipient can’t be found.