Enrique Iglesias' song "Bailando" — with versions in Spanish and in Spanglish — has hit big both on the Latin pop charts and the U.S. Billboard Hot 100. EnriqueIglesiasVEVO/YouTube hide caption

itoggle caption EnriqueIglesiasVEVO/YouTube

Monsignor Daniel Gallagher, a Latin expert at the Vatican, says people from all walks of life are following the pope's Twitter feed in Latin. Sylvia Poggioli/NPR hide caption

itoggle caption Sylvia Poggioli/NPR