Imagine when our ancestors first started to look up at the stars and question their place in the universe. Why are we here? Are we alone? What happens to us when we die? It is difficult to know for sure at what point in time we became a species obsessed with existential questions. We can roughly date when humans first started to paint magical beings on cave walls or carefully and ornamentally bury the dead. But precisely when our ancestors started to truly behave like us is a matter of considerable debate. What we do know, however, is that at some point tens or maybe even a hundred or more thousand years ago, people started to look beyond the basic day-to-day concerns of the body to focus on matters of the soul.