Korean giant Samsung kills off its new Galaxy Note 7 smartphone after a series of battery fires. Plus, as Microsoft expands the availability of its Hololens headset, we ask whether mixed and augmented reality is more useful than virtual reality. And we hear from Nadav Zafrir, the former commander of an Israeli army intelligence unit that's also a startup hub. Presented by Rory Cellan-Jones, with special guest Suw Charman-Anderson, founder of the annual Ada Lovelace Day event. (Image: Safety warning over Samsung Galaxy Note 7 to air travellers, Credit:Greg Baker/ AFP/ Getty Images).