Liu Xiaokong, professor of chemistry and a member of the Young Overseas High-level Talents Introduction Plan at Jilin University, delivers a lecture on self-cleaning surfaces at Shanxi University, on Oct 20. The Young Overseas High-level Talents Introduction Plan is a national plan initiated in 2001, with the aim of attracting high-level global experts who have made remarkable contributions in a specific filed. [Photo/sxu.edu.cn]