Argentine writer Ernesto Sabato (L) congratulates 76-year-old French nun Yvonne Pierron after she was awarded the Legion d' Honneur order during a ceremony in memory of her fellow nuns and compatriots, Alice Domon and Leonide Duquet, at the French embassy in Buenos Aires July 14, 2005. Sister Pierron was distinguished for her work with the human rights group Madres de Plaza de Mayo during Argentina's years of military dictatorship. Sisters Domon and Duquet were arrested in Argentina in December, 1977, by the military regime and their whereabouts are still unknown despite the efforts of human rights groups to clarify their fate. REUTERS/Enrique Marcarian EM/FA