What Happens in Vegas?

The annual Consumer Electronics Show (CES) in Las Vegas is where the tech companies present the gadgets and gizmos on which they'll be pinning their hopes during the year. Rory Cellan-Jones and guests assess whether and why anyone needs the automated cars, drones, wearable health devices, and internet-connected home appliances that the tech companies are trying to sell. With technology analyst Carolina Milanesi from Kantar WordPanel, and Zoe Kleinman and Leo Kelion from the BBC Online tech desk.