Moon Village, as seen in this artist's illustration, is a concept lunar outpost that would 3D-print protective shells around inflatable habitats using lunar soil. New research shows that urea, a compound found in urine, can function as a valuable additive to such 3D-printed structures. (Credit: ESA, Foster and Partners)Sign up for our email newsletter for the latest science newsIn the new research, scientists 3D-printed geopolymer cylinders using a range of different formulas. They found that a geopolymer mix using 3 percent urea (left) — which is found in urine — as a plasticizer was...…Moon Village, as seen in this artist's illustration, is a concept lunar outpost that would 3D-print protective shells around inflatable habitats using lunar soil. New research shows that urea, a compound found in urine, can function as a valuable additive to such 3D-printed structures. (Credit: ESA, Foster and Partners)Sign up for our email newsletter for the latest science newsIn the new research, scientists 3D-printed geopolymer cylinders using a range of different formulas. They found that a geopolymer mix using 3 percent urea (left) — which is found in urine — as a plasticizer was...WW…