In 1919, whalers pulled up a 27-ton humpback whale and saw something that should not have been there: two unmistakable legs. What first looked like a sea-monster story became one of the strangest ...

Call it an unfinished story, but with a plot that's a grabber. It's the tale of an ancient land mammal making its way back to the sea, becoming the forerunner of today's whales. In doing so, it lost ...