Could you get the same therapeutic benefits of a psychedelic drug without actually tripping? Neuroscientist David Olson wants to re-engineer psychedelic molecules to remove the trip. If successful, he might revolutionize the treatment of mental disorders.

Psychedelic therapy has shown great promise for treating depression, but it's still unclear why exactly it works. Psychiatrist Charles Raison wants to know if it's the drug or the trip that makes psychedelics so potent. Is it biology or consciousness?