Alva Review-Courier -

BERLIN (AP) — The European Space Agency said Friday that human urine could one day become a useful ingredient in making concrete to build on the moon.

The agency said researchers in a recent study it sponsored found that urea, the main organic compound in urine, would make the mixture for a "lunar concrete" more malleable before it hardens into its sturdy final form.

It noted that using only materials available on site for a moon base or other construction would reduce the need to launch supplies from Earth.

The main ingredient in "lunar concrete" would be a powdery soil found on the moon's su...