Huge reserves of groundwater – freshwater captured in aquifers centuries ago and later covered by rising seas – have been found below continental shelves in some of the world’s oceans. The research was published Dec. 5 in the journal Nature. The existence of such aquifers had been known, but new estimates project that the freshwater in those aquifers is 100 times the amount that humans have pumped from the ground since 1900, the lead researcher says. Read about the research in ScienceDaily.