In the 40 years since the psychedelic initiation of Timothy Leary, through the '60s counterculture movement and the War on Drugs, to this very day, the world at large has viewed hallucinogens not as a gift but as a threat. In this survey of recent writings, leading investigators and theorists in the fields of science, medicine, psychology, and religious studies reveal that a powerful social resource has gone largely untapped, and a re-evaluation is in order.