How do owls twist their heads all the way around without dying? At last we know.

You probably know that owls can rotate their heads a remarkable 270 degrees in either direction. It's practically their trademark — but it's a move that by all measure should result in a massive stroke or embolism, the result of torn blood vessel linings and the onset of fatal clots. Nobody's understood the… »1/31/13 2:00pm1/31/13 2:00pm