A picture taken from a screen as the Nobel Assembly at Karolinska Institute announces Elisabeth H. Blackburn, Carol W. Greider and  Jack W. Szostak as the winners of the 2009 Nobel Prize in Medecine on October 5, 2009 in Stockholm for discovering an enzyme which helps chromosomes in cells stay eternally young, the Nobel jury said. They were honoured for the discovery of "how chromosomes are protected by telemores and the enzyme telomerase," the jury said. AFP PHOTO / OLIVIER MORIN (Photo credit should read OLIVIER MORIN/AFP via Getty Images)