Yuval Noah Harari is one of the world's most famous public intellectuals, historians and writers. He is probably most famous for his book 'Sapiens: A Brief History of Humankind'. His most recent book, 'Sapiens: A Graphic History, Volume 2: The Pillars of Civilization' has just been published and offers a different way of telling the story of humankind for a younger audience. Yuval talks to Krishnan about where racism comes from, what the recipe for a dictatorship is and why we should be very careful about how we used artificial intelligence.  Producer: Rachel Evans