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Millions will miss Lady Violet's withering one-liners now that Downton Abbey is over. Chris Bowlby profiles one of Britain's most successful actors: Maggie Smith. Her extraordinary career has spanned Shakespeare on stage, Hollywood films and, of course, popular televison drama.Producer: Smita PatelPhoto credit: "Downton Abbey" / Carnival Films.

Elon Musk, the billionaire owner of SpaceX and Tesla Motors, has a plan to stop computers from taking over the world. The co-founder of Paypal - who made his first fortune in his twenties - has joined other tech giants to fund a not-for-profit company called OpenAI. Its aim is to develop the most advanced forms of artificial intelligence and then to share the results. Musk is among a group of thinkers - including Stephen Hawking - who have warned that AI could eventually lead to the end of the human race. His idea is that by making AI 'open source', powerful corporate interests will be kept in check. Mark Coles explores the life of a man with a passion for rockets, cars and a plan to retire to Mars.Producers: Smita Patel and Sally Abrahams.

Mark Clarke was once a rising star in the Conservative Party. He was a prominent figure who started and led 'RoadTrip2015', a project to bus young Conservatives into marginal seats to campaign door-to-door. Clarke was dubbed the 'Tatler Tory' after the magazine tipped him as a future minister. But he was recently expelled from the party following lurid allegations of blackmail and bullying, and the tragic suicide of one fellow activist.Presenter: Mark Coles Producer: Sonia Rothwell.