Time: The Earth may be more than 4.5 billion years old, but it can still surprise us. Scientists have discovered a gigantic liquid water reservoir underneath Greenland`s massive ice sheet. (The discovery was reported in an article in this week`s edition of Nature Geoscience.) Uncovered accidentally by a team of glaciologists who were drilling ice cores in southeastern Greenland in 2011, the aquifer is more than 27,000 sq. miles (69,930 sq. km) large--bigger than West Virginia--according to data from NASA`s...