 You know him. He's got a new book out called The End of Everything, How Wars Descend into Annihilation. I'm reading the book. I'm in the chapter with the Aztecs, okay, because I'm a history guy and I like all this stuff. So Professor Hanson, he teaches at Pepperdine. He's at the Hoover Institution. He's a busy guy, but he's taking time out to join us now from Palo Alto, California.