Book excerpt: Medical researchers have known for decades that survivors of accidents, disaster, and childhood trauma often endure life-long symptoms ranging from anxiety and depression to unexplained physical pain and harmful acting out behaviors. Drawing on nature's lessons, Dr. Levine teaches you each of the essential principles of his four-phase process: you will learn how and where you are storing unresolved distress; how to become more aware of your body's physiological responses to danger; and specific methods to free yourself from trauma.