The Australian businessman Craig Wright, who claims to have created the virtual currency Bitcoin, fails to make his case stick. Plus we go behind the assembly lines at Tesla to ask how the electric car-maker can hope to meet the 400,000 pre-orders it says it has for its new Model 3 vehicle. Presented by Rory Cellan-Jones, with special guest Garrick Hileman, economic historian at the University of Cambridge and London School of Economics, and Jane Wakefield from the BBC Online tech desk.