According to new research, Earth may have a vast reservoir of water deep underground, enough to equal all the water in the world's oceans. The finding echoes Jules Verne's depiction of a huge sea under the planet's surface, which he wrote about in Journey to the Center of the Earth, 150 years ago. More here.
Pictured: A view of the Blue Lagoon in the Pantanal region on November 17, 2013 near Cuiaba, Brazil.