An enterprising 19-year-old student in China heads a start-up tech company and is also a philanthropist who donated 100,000 yuan (US$15,000) to sanitation workers at his school. Wei Siyuan graduated from Baoan Middle School in Shenzhen, southern China’s Guangdong province, last year and was admitted to Hunan University. He also has another identity: the chief executive officer of a company that develops unmanned aerial vehicles and artificial intelligence (AI) powered equipment. As a result, he...