Urine is the result of a fascinating and complex system, of which the kidneys are the star, that evolved to keep our internal systems in balance, said Dr. David Pollock, a professor of medicine at ...

Go ahead, get the giggles out of the way. We're about to take a close look at urine, and in such conversations, bathroom humor is often the No. 1 byproduct. But once you're through, perhaps you ...