David Blaine appeared on "Oprah" on April 30, 2008, to set a new world record for holding his breath underwater. It seemed like yet another of his extreme stunts -- standing on a pole, being encased in ice, being suspended in a glass cube, etc. -- but the question remained, how did he go 17 minutes without breathing? Here is Blaine's explanation (which takes 20 minutes, by the way)...