There have been many scary stories about what could happen if artificial intelligence is allowed free rein, including ultimately the destruction of the human race,  but theoretical physicist Paul Davies says there's much to be welcomed about developments in AI, including significant improvements in cancer diagnosis and treatment, and improvements to important brain functions such as memory.  

Guest: Paul Davies, Regents’ Professor of Physics, and Director of the Beyond Center for Fundamental Concepts in Science at Arizona State University. He is the author of 33 books, including 'What's Eating the Universe? And Other Cosmic Questions.’