One of these days a massive 8.0 earthquake could happen in California. If so, it's likely to devastate the state. Add to that the other natural threats that we live with; wildfires, mudslides, tsunamis, and its no wonder why some live in fear.  But how the planet and mankind has managed to survive is the subject of a new book, "Scatter Adapt and Remember: How Humans will survive a mass extinction."  We’ll talk to the author, Annalee Newitz.