Before the flame wars start, yes, I am a Pierce fan. But I think people would have to agree that this is an interesting video. There is a little hype to it, (not much) but it is from a TV show. But Nat'l Geo. generally does a good job with their shows. There's four parts.

http://www.youtube.com/watch?v=o5mos8eyzwc
http://www.youtube.com/watch?v=lUKTUAoC0ag
http://www.youtube.com/watch?v=WXEC8wJIG6U
http://www.youtube.com/watch?v=JVh0kqE4gbE