The emotions of fear, sadness, surprise, anger, and disgust can be overwhelming during a traumatic event. Twenty-one years ago, on September 11, 2001, 19 Al Qaeda terrorists hijacked four planes and flew two planes into the World Trade Center towers and a third plane into the Pentagon. Heroic passengers on the fourth plane fought the hijackers, and the plane crashed in an empty Pennsylvania field. Almost 3,000 people died and more than 25,000 were injured when four planes were weaponized. TV stations broadcast the events live into the homes of millions that September morning, causing emotions to boil and leaving...