Elon Musk looks set to become the world's first trillionaire when his company SpaceX goes public on the stock exchange. A new book asks if we're living in an age of 'Muskism'. Plus, the story of Dr Ian Stevenson, the distinguished 1950s psychiatrist who become a leading figure in the controversial field of 'parapsychology'' where he tried to prove the existence of consciousness after death. Guests: Ben Tarnoff, writer and technologist, co-author of Muskism: A guide for the perplexedJesse Bering, professor of psychology at University of Otago, author of The Incredible Afterlives of Dr. Stevenson: One Scientist’s Epic Quest for Evidence of Reincarnation, Apparitions, Poltergeists, and Other Matters of the Soul