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...