It was the summer of 1966 when a persistent 17-year-old with a high school radio show near Chicago got the interview of lifetime: Muhammad Ali. But only a handful of people ever got to hear this time capsule. Until now.

Ali epically riffs about fighting on Mars, traveling through time, and explaining why big talk and boasting got him a shot at a title fight faster than other challengers. "Some of them thought I was crazy," Ali said. "They were frightened of me."

Interview by Michael Aisner // Muhammad Ali Fan Club, Chicago 1966 // reel-to-reel tape recorder