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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.

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.)!

A new portable machine uses a mixture of sand, bacteria and urine to create an eco-friendly concrete-like material that can be used to make bricks to build houses.

The machine, called 'Dupe', uses a mixture of sand, bacteria and urine to create a material called biostone.