Best-selling author Erich von Däniken and UFO researcher and biblical scholar David Halperin debate the theory of ancient astronauts, that advanced beings from other planets visited Earth in ancient times. David also continues with discussions about his very different views of UFO reality, and the causes behind related events. von Däniken is arguably the most widely read and most-copied nonfiction author in the world. He published his first (and best-known) book, Chariots of the Gods, in 1968. In the 1960s, David Halperin was a teen-age UFOlogist. He grew up to become a professor of religious studies at the University of North Carolina at Chapel Hill, with special expertise in religious traditions of heavenly ascent and otherworldly journeys. He is the author of five books and numerous articles on Jewish mysticism and messianism, and a novel, ‘Journal of a UFO Investigator.”