Finding the Ancient Honduran Civilization That Mysteriously Vanished Guest: Douglas Preston, journalist, "National Geographic," and author, "The Lost City of the Monkey God: A True Story" One of the greatest archaeological discoveries of our generation was made a few years ago when a research team went to the jungles of Honduras and discovered an ancient civilization whose ruins have been left completely untouched for centuries. River of Darkness Buddy Levy, author, "River of Darkness: Francisco Orellana's Legendary Voyage of Death and Discovery Down the Amazon" Francisco de Orellana accidentally sailed across a continent.  How a Bagel Union Fought Off the Mafia Guest: Jason Turbow, author, "How New York’s Bagel Union Fought — and Beat — a Mafia Takeover," Grub Street, "They Bled Blue: Fernandomania, Strike-Season Mayhem, and the Weirdest Championship Baseball Had Ever Seen: The 1981 Los Angeles Dodgers" In 1960's New York City, bagels were just getting popular, and the mafia wanted in on the profits. Bagel Union 338, though, would have none of it. Why is Grease So Tasty? Guest: George Motz, author, "The Great American Burger Book: How to Make Authentic Regional Hamburgers at Home" Lard and tallow have been a part of fast-food for generations. Here's why they're so much tastier than the vegetable oils that often replace them.