Most Americans believe that an afterlife exists, but unfortunately mainstream religions teach a generic faith-based view of it and mainstream science ignores the topic altogether. So people are hungry for concrete facts about the afterlife, and afterlife-related books are perennial best-sellers. Just this year, HarperOne published "Evidence of the Afterlife: The Science of Near-Death Experiences" by Jeffrey Long and Paul Perry, and Harper Collins published "Heaven: Our Enduring Fascination With the Afterlife" by Lisa Miller, both to much acclaim. But neither book answers the basic questions:...