"True skepticism has nothing to do with disbelief," says Susan Blackmore. "It is about taking people's claims seriously and trying to understand them." As a starry-eyed student, Blackmore was convinced of the reality of astral planes, telepathy, and life after death. She was determined to devote her life to parapsychology, but what she found wasn't what she had bargained for. None of her cleverly devised experiments revealed a hint of the psi she...