Scientists all over the world are searching for dark matter: an invisible, untouchable substance that holds our universe together. But they haven’t found it. Are they chasing a ghost? Sign up for our newsletter: http://vox.com/unexplainable-newsletter Show transcript and articles (including one about why we made this show now): vox.com/unexplainable Email us! unexplainable@vox.comWe read every email. Learn more about your ad choices. Visit podcastchoices.com/adchoices