SCIENCE: Universal law of urination found in mammals. “You’ll never look at Dumbo in the same way again. Elephants, cows, goats and dogs all take roughly 21 seconds to empty their bladders. A “law of urination” now explains the physics behind what happens when you just gotta go. Patricia Yang and colleagues at the Georgia Institute of Technology in Atlanta use high-speed video to study how fluids and animals interact; they have previously investigated how dogs shake themselves dry.”