100:00:01,669 --> 00:00:04,136By the lightof an ancient campfire,200:00:04,238 --> 00:00:09,375a discovery was made thatchanged the course of history.300:00:09,477 --> 00:00:12,177We don't know exactlyhow it happened,400:00:12,279 --> 00:00:15,814but I sometimes wonder whetherit wasn't a complete accident.500:00:15,916 --> 00:00:19,818