The biggest ever scientific study of near-death experiences shows that awareness can continue for a surprisingly long duration after the brain has shut down completely. The finding suggests that these experiences are more than just hallucinations — and that our definition of clinical death should probably be revised.
The light at the end of the tunnel. An out-of-body experience. Your life flashing before your eyes. According to Scientific American's Charles Q. Choi, 3% of Americans have had a near-death experience; now scientists are beginning to unravel the biological roots of these experiences.