Does it matter if AI is smarter than us?

We're hearing a lot about artificial intelligence - or AI - recently, and it's really a mixed bag.  It's technology some experts say can save lives, while others are warning it could become so powerful it will actually destroy humanity.  So what should we make of it?  Today, AI expert and chief scientist at the University of New South Wales AI Institute, Professor Toby Walsh, on why we should be alert, not alarmed.  Featured:  Professor Toby Walsh, Chief Scientist, UNSW AI Institute, University of New South Wales, Sydney