Akira Yoshino, this year's Nobel Prize in Chemistry laureate delivers a speech at Japan National Press Club
December 20, 2019, Tokyo, Japan - Akira Yoshino, this year's Nobel Prize in Chemistry laureate shows his autograph with a word "challenge" after he delivered a speech at the Japan National Press Club in Tokyo on Friday, December 20, 2019. Yoshino was awarded of Nobel Prize in Stockholm on December 10 for contributions to the development Lithium-ion batteries. (Photo by Yoshio Tsunoda/AFLO)