Unless you’ve owned reptiles, you might not know that many of them “pee” crystals. Researchers publishing in the Journal of the American Chemical Society investigated the solid urine of more than 20 reptile species and found spheres of uric acid in all of them. The work reveals how reptiles uniquely package up and eliminate crystalline waste, which could inform future treatments for human conditions that also involve uric acid crystals: kidney stones and gout.