Nuns greet Pope Francis as he arrives to lead the weekly audience in Saint Peter's Square at the Vatican on Thursday. The pope, speaking at his weekly general audience, said sometimes separation is "morally necessary." Tony Gentile/Reuters/Landov hide caption

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Pope Francis prays during his general audience in Saint Peter's Square at the Vatican on June 3. The pope has made statements supporting the idea that climate change is man-made, and his upcoming encyclical on the environment and poverty is highly anticipated. Vincenzo Pinto/AFP/Getty Images hide caption

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Pope Francis approved a plan Wednesday to set up a tribunal to review charges of negligence against bishops who are accused of covering up cases of sexual abuse by priests. Filippo Monteforte/AFP/Getty Images hide caption

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Pope Francis meets with Palestinian Authority President Mahmoud Abbas in the West Bank city of Bethlehem on May 25, 2014. The Vatican officially recognized the state of Palestine in a new treaty finalized today. Andrew Medichini/AP hide caption

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Pope Francis will canonize Junipero Serra this fall. This weekend, the pope met with rector of the Pontifical North American College James F. Checchio (left), Cardinal Marc Ouellet (right) and Joseph Edward Kurtz, president of the U.S. Conference of Catholic Bishops. Andrew Medichini/AP hide caption

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Archbishop Michael Fitzgerald is one of the Catholic Church's top experts on Islam. He has served the Vatican in places such as Tunisia, Uganda and Egypt, and now is promoting interfaith understanding by teaching Jesuit students in Cleveland about the Quran. /Rob Wetzler hide caption

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Pope Francis talks with a delegation of the Leadership Conference of Women Religious during an audience in the pontiff's studio at the Vatican on Thursday. The Vatican announced the unexpected conclusion of a controversial overhaul of the main umbrella group of U.S. nuns. L'Osservatore Romano/AP hide caption

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Pope Francis speaks during his weekly general audience in St. Peter's Square at the Vatican on Wednesday. ANSA, the Italian news agency, is reporting that the pope's doctors have urged him to reduce his pasta consumption. Andrew Medichini/AP hide caption

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Pope Francis arrives for a special audience with the members of the UCIIM Catholic union of Italian secondary school teachers, in the Pope Paul VI hall, at the Vatican on Saturday. L'Osservatore Romano via AP hide caption

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Pope Francis leads the consistory at St. Peter's Basilica in Vatican City. In addition to 15 new electors, Pope Francis named five new cardinals who are over the age of 80 and, therefore, ineligible to vote in a conclave. Franco Origlia/Getty Images hide caption

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People look at a portrait of Oscar Romero at the cathedral of San Salvador, where as archbishop he resisted a brutal regime. He was murdered and the Vatican has declared him a martyr. STR/AFP/Getty Images hide caption

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Archbishop Oscar Romero of El Salvador (shown in 1977) was gunned down in a church in San Salvador in 1980 after criticizing a government crackdown. He had been celebrating Mass at the time. AP hide caption

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