Nuns walk through the colonnade at Saint Peter’s square at the Vatican

Nuns walk through the colonnade in Saint Peter’s square at the Vatican March 10, 2013. Roman Catholic cardinals will enter a conclave to elect a successor to Pope Benedict on March 12, the Vatican said on Friday, with no clear favorite emerging so far to take charge of the troubled Church. REUTERS/Paul Hanna (VATICAN – Tags: RELIGION)