how old is water
A scientists takes a sample of water from a mine deep underground in Ontario, Canada. The water turned out to be 2.6 billion years old, the oldest known water on Earth. Credit: B. Sherwood Lollar et al. Last month, scientists announced they had found an ancient pocket of water buried in a mine 2 miles below Earth's surface. The water, up to 2.6 billion years old, may have been around longer even than multicellular life. The find raises intriguing possibilities for understanding how life arose on Earth and if it could survive on other planets. But the really burning questions is, of course, what does it taste like?