Hearsay With Cathy Lewis

Half of Americans have been affected by a disaster of some kind. In big disasters, regular people are the first and most important rescuers on the scene. But very few of us know what to expect until it is too late. On Tuesday's HearSay we'll talk with the author Amanda Ripley about her book "The Unthinkable: Who Survives When Disaster Strikes-And Why." Ripley reveals how human fear circuits and crowd dynamics work, why our instincts sometimes misfire in modern calamities, and how we can do much, much better.