Previous episodes of Healing Psychology highlight psychology’s failure to help us explain and control addictions and other disease-like habits. The failure can be traced to a single source—psychology’s disconnect from its mother science, biology. A century ago, influential theorists made a dreadful blunder. They decided that psychology would no longer study the psyche—the conscious mind, soul, or spirit. That was a strange decision, and a mystery, because the word psychology literally means “the study of the psyche.” Why did this happen?