According to Gallup, about 8 million Americans claim to have had a near-death experience (NDE), and many of them regard it as irrefutable proof of an afterlife. Skeptics insist those are merely anecdotal, and easily explained away by the biochemistry of the dying brain, pumped up by morphine and stress. The truth is, though, NO ONE knows for sure. Listen as we explore some of the various experiences and possibilities.