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Long before Timothy Leary urged a generation to “tune in, turn on and drop out,” lysergic acid diethylamide, or LSD, was being used by researchers trying to understand the human mind. This documentary is a fascinating look at the story of “acid” before it hit the streets.

Discovered in 1943 by Swiss chemist Albert Hofmann, LSD was hailed as a powerful tool to treat alcoholism and drug addiction and to provide a window into schizophrenia and other mental illnesses. While researchers were establishing the medical benefits of LSD, others, such as Brave New World author Aldous Huxley, promoted the drug as a powerful tool for mental exploration and self-understanding. At Harvard, Timothy Leary, Ralph Metzner and Ram Dass (then known as Richard Alpert) became popular heroes after the university canceled their research project into psychedelics.