Turn on, turn off - drugs that changed the world. Pt. 1, The mind-benders.

First in a four-part series on drugs that have had a huge impact on the world. In this episode, Susan Greenfield explores the world of psychoactive and hallucinogenic drugs such as LSD and Ecstasy, their medical uses in the past, their recreational uses in the past and present, and their effects on the brain and body.