Why have so many of us seen ghosts?

One in 5 Americans say they've seen a ghost. But what if it was really our brain that had tricked us into thinking we saw something we didn't? In the "Science of the Supernatural" psychology professor Melissa Maffeo argues how a paranormal experience could be our brains just misinterpreting the external world. *** Thank you for listening. Help power On Point by making a donation here: wbur.org/giveonpoint