https://www.wired.com/story/on-the-moon-astronaut-pee-will-be-a-hot-commodity/

Ever since President Donald Trump directed NASA to get boots on the moon by 2024, the agency and its partners have been hard at work trying to make it happen. Late last month, NASA awarded contracts to three companies to develop a crewed lunar lander, but getting to the moon is just the start. The agency also plans to build a permanent moon base before the end of the decade and use it as a stepping stone to Mars.

If astronauts are going to spend weeks at a time on the moon, they’re going to have to figure out how to live off the land—er, regolith. It’s too expensive to ship everything from Earth, which means they’ll have to get creative with the limited resources on the lunar surface. Moon dirt is a great building material and there’s water in the form of ice at the south pole that can be turned into rocket fuel. But the hottest commodity of them all may very well turn out to be an astronaut’s own pee.