The Download: Russia is risking the creation of a "splinternet"--and it could be irreversible

The big picture: Psychedelic drugs have long been touted as possible treatments for mental-health disorders like depression and PTSD. But very little is really known about what these substances actually do to our brains. Understanding how they work could help unlock their potential. A new methodology: Some scientists are using AI to figure it out. A team at McGill University in Montreal used natural language processing to study written "trip reports" of users' experiences with a range of drugs.