Chinese medical scientist and Nobel Prize in Physiology or Medicine co-laureate Tu Youyou of China Academy of Chinese Medical Sciences signs a chair at the Nobel Museum in Stockholm, Sweden, December 6, 2015. As tradition, Nobel prizewinners has signed a chair in the Nobel Museum cafe since the museum opend in year 2001. The Nobel Prize ceremony will take place in Stochkolm on Dec. 10.(Photo/Agencies)
