We are Drawn to the Supernatural

WE HAVE, it seems, a fierce attraction for spirits: auras, angels, poltergeists, disembodied souls, out-of-body experiences. Mostly, I think, we are drawn to these things because we intuit—correctly, it turns out—that there must be more to the world than meets the eye. We inherit the spirit world from a time when our ancestors huddled in dark shelters at night and let their imaginations draw up creatures more or less like ourselves although lacking corporeal substance. But why should we c...