AI will be the defining development of the 21st century and in the next two decades it is set to transform our lives. Kai Fu Lee, a former CEO of Google China and AI pioneer tells us that the technology will revolutionise health and education and has the power to create great wealth but it also has a dark side. AI he says, can pose huge risks like when used in autonomous weapons. Kai Fu Lee believes that we are now at a turning point, and is urging society to wake up to the benefits and the existential threats. (Image: Kai Fu Lee, Image credit: Getty Images)