We listen to archival interviews with Michael Collins, of Apollo 11; Alan Shepard, the first American in space; Canadian astronaut Chris Hadfield; and Chuck Yeager, who first broke the sound barrier.
The former International Space Station commander achieved Internet stardom with his in-space rendition of David Bowie's "Space Oddity." After three missions and a total of six months in space he shares what he's learned in a new book, An Astronaut's Guide to Life on Earth.