Mukhisa Kituyi (1st L), Secretary-General of the United Nations Conference on Trade and Development (UNCTAD), Zhao Houlin (2nd L), Secretary-General of the International Telecommunication Union (ITU), and Tedros Adhanom Ghebreyesus (1st R), Director-General of World Health Organization (WHO), pose for a photo with Robot Sophia, an artificial intelligence humanoid robot, at the 2nd AI for Good Global Summit in Geneva, Switzerland, on May 15, 2018. The 2nd AI for Good Global Summit kicked off in Geneva on Tuesday. (Xinhua/Xu Jinquan)