Photo taken on Oct. 3, 2018 shows a screen displaying the portraits of awarded scientists Frances H. Arnold of the United States (L), George P. Smith of the United States (C) and Sir Gregory P. Winter of the UK (R) for the 2018 Nobel Prize in Chemistry during a press conference at the Royal Swedish Academy of Sciences in Stockholm, Sweden. The 2018 Nobel Prize in Chemistry is awarded to three scientists, the Royal Swedish Academy of Sciences announced on Wednesday. (Xinhua/Ye Pingfan)