Unexplainable

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? We want to hear your feedback on Unexplainable! Email us at todayexplained@vox.com or let us know on Twitter @today_explained Transcript at vox.com/todayexplained. Learn more about your ad choices. Visit podcastchoices.com/adchoices