Reuters: If you want to find Earth's vast reservoirs of water, you may have to look beyond the obvious places like the oceans and polar ice caps.
Scientists on Friday said massive amounts of water appear to exist deep beneath the planet's surface, trapped in a rocky layer of the mantle at depths between 250 miles and 410 miles (410 km to 660 km).
But do not expect to quench your thirst down there. The water is not liquid - or any other familiar form like ice or vapor. It is locked inside the molecular...