On todays show, were talking to William Rosen, author of The Third Horseman: A Story of Weather, War, and the Famine History Forgot (Penguin Books, May 2014). A seven-year famine is thought to have caused 5-8 million deaths in northern Europe in the 14th century—but Rosen argues that the famines severity was exacerbated by the preceding Medieval Warming Period. We also hear from Mark Hay about the time it rained worms in Norway and meat in Kentucky.