Jack Ma is now one of the world's richest men but failed – thrice – at entering university. The founder and executive chairman of e-commerce giant Alibaba Group was in Hong Kong on May 18 to receive an honorary doctoral degree from the University of Hong Kong. He urged the young to help solve Hong Kong's and the world's problems. To him, the greatest challenge of the future is to nurture independent and creative thinkers who are capable of doing what machines are not able to do.