In an age of AI-induced answers to complex mathematical problems, Chinese mathematician Sun Zhiwei maintains that curiosity and asking good questions are more important then ever. Over a career spent probing the edges of number theory, Sun, a 61-year-old professor at Nanjing University’s department of mathematics, has built a vast landscape of problems – more than 1,000 and counting – for the global research community to tackle. While traditional mathematical training emphasises mastering...