In this episode of On Drugs, we explore the connection between psychedelic drugs like LSD and psilocybin and the transcendent feelings and perceptions that users report. Ethnobotanist Wade Davis shares his insight into the seeming ubiquity of psychedelics in mystical experience in the Americas. Dr. Rick Strassman describes what happened when he went in search of the spirit molecule. And Tanya Kammonen explains how ayahuasca prepared her scientific mind for religious experience.