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Security researchers at the Def Con hackers' gathering in Las Vegas tell us how they took over a Tesla car. Plus, a look at the software used by some governments to monitor people. And, what might the destruction of HitchBOT, a hitch-hiking robot, say about our willingness to accept mechanised companions at home and work? Presented by Zoe Kleinman, with special guest security expert Graham Cluley.

(Photo: Tesla dashboard. Credit: AFP/Getty Images)