We've all heard it a zillion times: don't pee in the pool. But why?
Urine contains uric acid, which, when in contact with chlorine, creates cyanogen chloride and trichloramine. These chemicals are bad for your lungs and can cause irritation, especially in indoor pools. So, for the greater good of us all, only pee where other living things pee (ocean: check, forest: check, etc.)!
Scientists in China say they have successfully grown a human tooth using stem cells taken from urine.
Researchers say the technique could one day be used as a way to replace teeth lost through aging and poor dental hygiene, with the added bonus that urine is deemed a less controversial source of stem cells than human embryos.