Drinking urine: Its the dirty little secret of longterm space travel.

The costs of transporting water to the International Space Station and beyond are so cost-prohibitive $48,000 per liter that NASA engineers had to find cheaper ways of taking H20 into space.

Luckily for science, someone figured out a method. Unluckily for the astronauts, its turning their own pee into potable drinking water.

According to Americas Secret Space Heroes, a documentary series airing Sundays on the Smithsonian Channel, NASA scientists distilled all the information about urine and created a distillery that turns an astronauts whiz into drinking water.