Neurologist and author Oliver Sacks brings our attention to Charles Bonnett syndrome — when visually impaired people experience lucid hallucinations. He describes the experiences of his patients in heartwarming detail and walks us through the biology of this...

Dr Robin Carhart-Harris talks about his scientific research into the effects and potential therapeutic uses of psychedelic drugs. Join him as he discusses brain imaging work involving psilocybin, the active ingredient of magic mushrooms, and explains how the drug...