Psychologist George Bonanno, author of “The End of Trauma: How the New Science of Resilience Is Changing How We Think About PTSD,” explores the history, science, and nature of trauma. He says that contrary to popular opinion, trauma plays a significant role in building human resilience and that people are overwhelmingly resilient to adversity. Trauma or traumatic events, Bonanno says, have “become an easy and convenient excuse as to why we can’t function.”