Bill Nye sits down with Hari to discuss the inspiration for his book Undeniable: Evolution and the Science of Creation, in which he asks the big question: Where did we come from?

The science educator, the CEO of the Planetary Society, the “Science Guy” himself, Bill Nye joins us to talk about his new book Undeniable: Evolution and the Science of Creation and about his Kickstarter project, the LightSail, a breadbox sized spacecraft powered by the light of the sun.