At 6'6" tall, Penn Jillette is a huge character. He's got a huge frame, a huge personality, and huge appetites. It's a trait that has occasionally gotten him into trouble; he weighed, until a recent diet change, more than 350 pounds. But his gregarious energy mostly expands to fill every moment of free time with professional success. He's an inventor, an entrepreneur, a podcast host, a TV show creator, a Twitter celebrity, a comedian. And for more than forty years, he's been the talking half of stage magic duo Penn & Teller. He talks to host Alec Baldwin about his lifelong atheism, what it's like to perform the same trick for four decades, and why he's committed to debunking nonsense.