Canada's Prime Minister Stephen Harper (C) speaks during a meeting with Nobel laureates in his office on Parliament Hill in Ottawa October 28, 2009. Pictured are Peter Doherty (L) of Australia, Bengt Samuelsson (2nd L) of Sweden, Harald zur Hausen (2nd R) of Germany and Rolf Zinkernagel (R) of Switzerland. Reuters Pictures logo Reuters Pictures 28 months ago

Canada's Prime Minister Stephen Harper (C) speaks during a meeting with Nobel laureates in his office on Parliament Hill in Ottawa October 28, 2009. Pictured are Peter Doherty (L) of Australia, Bengt Samuelsson (2nd L) of Sweden, Harald zur Hausen (2nd R) of Germany and Rolf Zinkernagel (R) of Switzerland.