Yahoo! has admitted that up to half a billion of its users may have had their details stolen by hackers. We hear from renowned security consultant Troy Hunt. Plus, Paul Lee of Deloitte tells us whether phone giants are failing to keep customers' attention with new models. And our special guest Adriana Hamacher talks about what humans want from robots. Presented by BBC Technology Correspondent Rory Cellan-Jones, with Chris Foxx from the BBC Online tech desk. (Image: Yahoo! CEO Marissa Mayer, Credit: Getty Images).