Jim Al-Khalili looks at how man has created machines that can simulate, augment, and even outperform the human mind - and why this shouldn't cause alarm. He reveals the story of the pursuit of AI, the emergence of machine learning and the recent breakthroughs brought about by artificial neural networks. He shows how AI is not only changing the world, but also challenging man's very ideas of intelligence and consciousness. Along the way, the programme investigates spam filters, meets a cutting-edge chatbot, looks at why a few altered pixels makes a computer think it's looking at a trombone rather than a dog