In 1943, chemist Albert Hofmann accidentally exposed himself to a drug he derived from ergot fungus and recorded its unexpected, mind-altering effects. The drug, lysergic acid diethylamide— or LSD— was soon heralded for its psychiatric potential. But how do LSD and other psychedelic drugs affect the body? And can they actually be medicinal? Anees Bahji explores the science of psychedelics. Lesson by Anees Bahji, directed by Rowena Sheehan.