Can people win the nobel prize more than one time?

As of 2009, four individuals have won a Nobel prize twice: Marie Curie (physics 1903, chemistry 1911), Linus Pauling (chemistry 1954, peace 1962), John Bardeen (physics 1956, physics 1972), Frederick Sanger (chemistry 1958, chemistry 1980). The only one of the four who was awarded both prizes as a solo recipient was Linus Pauling. If you want to count groups also, the International Committee of the Red Cross has been awarded the Peace prize three times (1917, 1944, 1963). Also, the Peace prize has twice been awarded (1954, 1981) to the UN High Commissioner for Refugees, though that office was not held by the same person both times.