ARLINGTON, Virginia, Oct. 3 -- PBS issued the following news release: If you were suddenly dropped back in time half a billion years ago into the Cambrian period, could you survive? Or 66 million years ago in the aftermath of a giant space rock hitting the Earth? The question of "How long could a human survive if they were dropped into a particular period of time" is one of the most frequently asked by fans of PBS Eons, the popular YouTube series. And it's exactly the question that their newest  more