Sheryl WuDunn on This Year's Nobel Peace Prize Winners
Yemen's Arab Spring activist Tawakkul Karman, Liberian President Ellen Johnson Sirleaf and Liberian 'peace warrior' Leymah Gbowee are winners of the 2011 Nobel Peace Prize.
( GAMAL NOMAN/AFP/Getty Images / Getty )
( GAMAL NOMAN/AFP/Getty Images / Getty )
