Why did many religious leaders--Moses, Old Testament prophets, Zoroaster--claim they heard divine voices? Why do ancient civilizations exhibit key similarities, e.g., the "living dead" (treating the dead as if they were still alive); "speaking idols" (care and feeding of effigies); monumental mortuary architecture and "houses of gods" (pyramids, ziggurats, temples)? How do we explain strange behaviour such as spirit possession, speaking in tongues,...