Car accidents. Suicide bombers. Earthquakes. Death of a spouse. Why do some people bounce back from traumatic events while others do not? Is there a biological profile of resiliency? Can science, with the jab of a needle or huff of an aerosol, help reduce post-stress trauma? Can, and should, we train people to be more resilient? Leading thinkers from around the world explore these and other questions about the science of human resiliency.