Ascension from a scientific point of view (videos)

I just came across this video and it filled in many gaps in my understanding, so I thought it might be worth posting up here!

Part1 - http://video.google.com/videoplay?docid=-8506668136396723343&q=&hl=en

Part2 - http://video.google.com/videoplay?docid=-6568107389365915765&q=&hl=en

Enjoy!