Ten years ago, Dr. Madan Kataria burst out laughing for no reason at all. Since then he's helped form over 3000 "laughter clubs" throughout India, toward the goal of creating a million such clubs around the world. "When you laugh, you change," explains Kataria, whose fans include actors Goldie Hawn and John Cleese. "And when you change, the whole world changes around you." Take a peek at this Pangea Day presentation by Neil Davenport--and see if you don't find yourself laughing, too.