An international team of researchers have finally discovered the source of a weird, low-frequency rhythmic sound that has puzzled scientists and submarine sonar operators for more than half a century. Listen to it.
Space may be the final frontier of exploration, but there’s plenty of Earth left unmapped too — from the giant canyon recently discovered beneath Greenland to American waters that have been left largely unexplored. But that’s quickly changing, thanks in part to Bob Ballard’s latest project.