When noted biologist and public intellectual E.O. Wilson visited the Grist offices touting his new book The Meaning of Human Existence, we took the opportunity to ask him: Well? What is it?

What followed was a deep and often funny conversation about who we are, where we came from, and why Interstellar is a poor example of melding science with the humanities (burn, Nolans). Oh, and Mr. Wilson’s also got some heady notions about where both our species and the planet are headed. Watch the video to have your mind blown.