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.
Check out these screen shots from BBC's forthcoming wildlife documentary series, Great Barrier Reef.
There must be a good reason you'd be in an open air basket 367 feet above the ground. Besides hot air ballooning, you might be standing in a Bronto S-112 HLA, repairing hunchback damage atop the world's most famous cathedral.