CHICAGO, IL - APRIL 23: Actor and philanthropist Sean Penn listens as former Russian President Mikhail Gorbachev speaks with students at Frederick Von Steuben Metropolitan Science Center as part of ... more 
CHICAGO, IL - APRIL 23: Actor and philanthropist Sean Penn listens as former Russian President Mikhail Gorbachev speaks with students at Frederick Von Steuben Metropolitan Science Center as part of the World Summit of Nobel Peace Laureates on April 23, 2012 in Chicago, Illinois. The 12th World Summit of Nobel Peace Laureates convenes in Chicago today and runs through Wednesday, April 25. (Photo by Scott Olson/Getty Images) less 
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Getty Images | Photo By Scott Olson / Getty Images
Mon, Apr 23, 2012 8:20 PM EDT