Jia Yangqing, vice president of Alibaba, makes a keynote speech on behalf of young scientists who participate in the World Young Scientist Summit 2019 in Wenzhou, east China's Zhejiang Province, Oct. 26, 2019. The World Young Scientist Summit 2019 opened Saturday in the city of Wenzhou in east China's Zhejiang Province. The two-day conference brings together some 800 participants from over 100 countries and regions, including Nobel laureates and academicians from home and abroad. (Xinhua/Han Chuanhao)