Australian-born Elizabeth Blackburn (R) has a champagne toast with Susan Desmond-Hellmann, Chancellor of the University of California, San Francisco, in San Francisco, California, October 5, 2009. Blackburn along with two other Americans won the Nobel prize in medicine for discovering and identifying telomerase, the enzymen that renews the little caps on the end of chromosomes whose natural fraying underlies aging and cancer. [Agencies]