Photos of the three awarded scientists are seen on a screen in Stockholm, Sweden, Oct. 2, 2017. Three scientists share 2017 Nobel Prize in Physiology or Medicine, the Nobel Committee announced on Monday in Stockholm. The Nobel assembly at the Karolinska Institute has decided to award the 2017 physiology or medicine prize jointly to Jeffrey C. Hall, Michael Rosbash and Michael W. Young for their discoveries of molecular mechanisms controlling the circadian rhythm. (Xinhua/Shi Tiansheng)