Matt Groening discusses 'The Simpsons' hitting 500 episodes

Matt Groening had a 'vague idea of invading pop culture.' His invasion, 'The Simpsons,' became an occupation. After 500 shows, there are still stories to tell. The Simpsons of Springfield, U.S.A., will mark their 500th episode as a TV family Sunday. "The Simpsons," in its 23rd season on Fox, is already the longest-running cartoon, the longest-running situation comedy and the longest-running