Photo taken on Oct. 2, 2018 shows a screen displaying the portraits of three awarded scientists Arthur Ashkin (L) of U.S., Gerard Mourou (C) of France and Donna Strickland of Canada, for the 2018 Nobel Prize in Physics during a press conference at the Royal Academy of Sciences in Stockholm, Sweden. The 2018 Nobel Prize in Physics is awarded to three scientists working the field of laser physics, the Royal Swedish Academy of Sciences announced here on Tuesday. (Xinhua/Ye Pingfan)