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Pope Francis, top, greets cardinals at the end of the opening Mass for the Synod of Bishops on Young People, in St. Peter's Square at the Vatican, on Oct. 3, 2018. The synod is bringing together 266 bishops from five continents for talks on helping young people feel called to the church at a time when church marriages and religious vocations are plummeting in much of the West. (AP/Alessandra Tarantino)