Scientists Explain Whether the Water We Drink Was Once Urine

A lighthearted question about whether all the water on Earth was once urine leads into a serious explanation of how water circulates through the planet. Water evaporates, forms clouds, falls as rain, runs through rivers, and also passes through living creatures. Based on rough scientific estimates spread over millions of years, the amount of urine released is so enormous that it is very likely much of the water people drink today once passed through a living body, perhaps even a dinosaur.