The Public Science Day, officially designated as the Chinese Academy of Sciences Public Science Day, is a public welfare science outreach initiative organized by the Chinese Academy of Sciences (CAS). Since 2004, this event has been held annually in May. During this year's 27th Public Science Day at the Dalian Institute of Chemical Physics, CAS, Professor Ping Chen was invited to deliver a talk with the titled of 'The Past and Present of Hydrogen'.
Related link: 赴科学之约 赋未来之翼——我所举办第27届公众科学日