The Flash version of the video file in the media folder is a short dinosaur video, not the sampson video. The dinosaur video should only be played in an older browser that doesn't support the video element.
On February 15, 2012, Dr. Scott Sampson will present a lecture titled ‘Fossil Threads in the Web of Life’
In the meantime, you can see a video of Dr. Sampson below.
Play Flash video.