Laura BickerChina correspondent, Beijing, Hangzhou and ChengduWatch: BBC visits factories in China with robot workers"I take a nap and the world changes," says Chen Tianyu.His world certainly does. The 28-year-old keeps up with the latest technology by spending his spare time in factories that are switching to automation. That way he knows what to prioritise when teaching his class about artificial intelligence (AI) and robotics.In front of him, around 30 college students are studying code. One ...