Physical artificial intelligence (AI) – the marriage of advanced machines with “brains” that allow them to interact with their environment – is expanding rapidly in China. It’s fuelling the development of smarter robots, drones and driverless cars that are appearing on roads and factory floors, in the skies and even on stage. Delivery drones have taken flight over cities like southern China’s Shenzhen, while delivery bots are riding city subways. The first autonomous vehicles are plying public...