Miles O'Brien shares inside stories of his 15 years as CNN's science, space and aviation correspondent, his passion for piloting, how close he got to flying on a space shuttle, the unusual sequence of events that led to the amputation of his left arm, and the childhood roots of the resilience which led him to belay 12 feet beneath the surface of a glacier so soon after the accident. Miles and Michael spoke together on the island of Nantucket before a live audience of conservation leaders from the Organization of Biological Field Stations: "NASA of the Earth."