(In this picture released by the Vatican newspaper L'Osservatore Romano, Cardinals line up to take an oath of secrecy inside the Sistine Chapel at the Vatican, Tuesday, March 12, 2013, before the start the conclave to elect the 266th Roman Catholic pope.Cardinals from around the globe locked themselves inside the Sistine Chapel on Tuesday to choose a new leader for the world's 1.2 billion Catholics and their troubled church, surrounded by Michelangelo's imposing frescos imagining the beginning and the en)
