From The Sixth Sense to Medium, Ghost Whisperer to Ghost Hunters, the paranormal stirs heated debate, spawning millions of believers and skeptics alike. Nearly half of us say we believe in ghosts, and two-thirds of us believe in life after death. What would you make of rain barrels that refill themselves? Psychic horses? Mind-reading Cold War spies? For a group of scientists at the Duke Parapsychology Lab under the leadership of Dr. J. B...