I have spent five years working on a documentary film about why we are so susceptible to fake news, disinformation and conspiracy theories and what to do about it. I accompanied investigative journalists from the New York Times Visual Investigations and from the International Consortium of Investigative Journalists as well as computer scientists from UCLA and UC Berkeley who have built software that can autonomously detect conspiracy theories online. They are working closely with neuroscientists from UCLA, whose research with epilepsy patients has revealed a lot about how information is being processed in the brain at the level of individual neurons.