Astronaut urine could be a key concrete ingredient on the moon

Are you extracting the urine, ESA? Why, yes it is, from Moon dwellers to build homes out of lunar regolith. Possibly

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I propose that large quantities of high fiber legumes be made astronaut’s staple diet. Then they could shit a brick and build that lunar settlement one dump at a time. Uhh. This one’s for the Gipper.

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