Electric bikes and scooters are popular. But charging them can be inconvenient, and occasionally risky. We look at various approaches to charging batteries around the world. Also this week, our reporter Marc Cieslak meets schoolchildren involved in a project to introduce them to artificial intelligence and programming through skills acquired playing chess. And we try out the next generation of Bluetooth connectivity. Presenter: Zoe Kleinman Producers: Alasdair Keane and Tom Quinn (Photo: Charging an electric bike. Credit: Henglein and Steets/Getty Images)