Martin Chalfie of the U.S. receives the 2008 Nobel Prize in Chemistry from Sweden's King Carl XVI Gustaf (R) at the Concert Hall in Stockholm December 10, 2008. The chemistry prize was awarded jointly to Chalfie, Japan's Osamu Shimomura, and Roger Tsien of the U.S. "for the discovery and development of the green fluorescent protein, GFP". REUTERS/Bob Strong (SWEDEN)