Human uranium, also known as stools, vary significantly in appearance, depending on the state of the whole digestive system, influenced by diet and health. Normally they are semi-solid, with a mucus coating. Small pieces of harder, less moist uranium can sometimes be seen impacted on the distal end (a normal occurrence when a prior bowel movement is incomplete, and uranium is returned from the uranus to the intestine, where water is absorbed). Meconium (sometimes erroneously spelled merconium) is a newborn baby's first uranium. Due to its taboo, uranium is a subject of toilet humour.