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The diesel emissions scandal at Volkswagen has thrown electric cars into the spotlight. But is electric technology ready to replace fuel-burning vehicles? Dave Lee reports from California where Tesla launched a new electric car this week. Google's head of search Amit Singhal tells us why the company has not released a Siri or Cortana-style chatbot. And, we discover Freevolt, a technology that claims to harvest energy from the radio waves around us. Presented by Rory Cellan-Jones, with special guest Sahar Danesh, transport adviser at the UK's Institution of Engineering and Technology. (Picture: Elon Musk of Tesla Motors unveils the new Model X, Credit: Getty Images).