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A software glitch knocks out mobile data around the world for a day and reveals how vulnerable our lives are to mistakes or meddling in networks. Plus, DeepMind's AlphaZero system that can teach itself to play chess better than any grandmaster or chess program within hours features on the cover of the prestigious journal Science. And it is 50 years since the American engineer Doug Engelbart gave "The Mother of all Demos" in which he showcased the mouse, video conferencing, hypertext, and many other concepts that formed the basis of modern computing. Presented by Rory Cellan-Jones, with BBC tech reporter Chris Foxx, and special guest Kate Bevan, editor of Which? Computing. (Image: Stock photo of a woman sitting behind a laptop and frustrated at her smartphone, Credit: Getty Images).