Post-traumatic stress disorder (PTSD) is a challenging condition with a collection of possible symptoms: nightmares, relentless harmful emotions (anger, fear, guilt), hypervigilance, flashbacks, and an amplified startle response. PTSD patients are at greater risk of suicide. About 80 percent of the afflicted also suffer from other psychiatric problems (depression, alcoholism, drug abuse). Some causes of PTSD are rape, combat exposure, child abuse,...