Dave talks to Kathryn Miles, author of Quakeland. In her new book, the journalist explores the less obvious threats due to seismicity than the usual "California and the west are earthquake country," point of view. In fact, most of the U.S. is shockingly vulnerable to earthquakes that could cost lives and damage an increasingly fragile infrastructure. Explore the deepest mine in the country and discover, along with our guest, how little we understand the inner workings of our own planet.