Pope Benedict XVI delivers his blessing during his last Angelus noon prayer from the window of his studio overlooking St. Peter's Square at the Vatican on Sunday, Feb. 24, 2013. (AP Photo/L'Osservatore Romano)

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Pope Benedict XVI delivers his blessing during his last Angelus noon prayer from the window of his studio overlooking St. Peter's Square at the Vatican on Sunday, Feb. 24, 2013. (AP Photo/L'Osservatore Romano)