Goran K. Hansson (C), secretary-general of the Nobel Committee and Nobel Assembly, announces the winners of the 2015 Nobel Prize in Physics in Stockholm, Sweden, Oct. 6, 2015. The 2015 Nobel Prize in Physics were shared by two scientists, namely Japan's Takaaki Kajita and Canada's Arthur B. McDonald, the Royal Swedish Academy of Sciences announced on Tuesday. (Xinhua/Rob Schoenbaum)
