They grow a new pair of legs at each stage. Angel Fitor In every drop of water is a hidden world. Scuba divers can’t see it through their masks; neither can snorkelers swimming among the coral ...

Some more fun facts (and big numbers): There are 1,500,000,000,000,000,000 molecules of water (H₂O) in a single drop of water. That’s 1.5 million, million, million. The oldest water in the ...