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Prior to that, makers of gunpowder took advantage of the nitrogen naturally found in pee to make the key ingredient for ballistic firepower. Privacy Terms of Use Sign up. In fact, in ancient Rome, vessels for collecting urine were commonplace on streets—passers-by would relieve themselves into them and when the vats were full their contents were taken to a fullonica a laundry , diluted with water and poured over dirty clothes. So a reminder to you, from me, good Egnatius. It can now be used as a source of electric power. Medicines derived from urine can help treat infertility and fight symptoms of menopause. You guessed it: ammonia, which lifted stains away.

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Ammonia in water acts as a caustic but weak base.

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From Gunpowder to Teeth Whitener: The Science Behind Historic Uses of Urine

Stem cells harvested from urine have been reprogrammed into neurons and even used to grow human teeth. Its high pH breaks down organic material, making urine the perfect substance for ancients to use in softening and tanning animal hides. You guessed it: ammonia, which lifted stains away. Egnatius, because he has snow-white teeth, smiles all the time.

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