Several years after US diplomats in Cuba claimed they were attacked by an invisible weapon, similar incidents continue to be reported around the world. Scientists haven’t been able to determine a definitive cause, but the possibilities point toward something just as mysterious as the illness itself: the inner workings of the human brain. For more, go to http://vox.com/unexplainable It’s a great place to sign up for our newsletter, view show transcripts, and read more about the topics on our show. Also, email us! unexplainable@vox.com We read every email. bit.ly/givepodcasts Learn more about your ad choices. Visit podcastchoices.com/adchoices