In this episode, journalist Leslie Sabbagh discusses the teen brain, the subject of her cover story in the August/September issue of Scientific American Mind. Geologist Kip Hodges, the director of the Arizona State University School of Earth and Space Exploration, answers a listener's question about the earth's fickle magnetic poles. Plus we'll test your knowledge about the status of Pluto and other science in the news. Websites mentioned on this episode include and