UN secretary-general Ban Ki-moon will open a major Vatican conference on the environment on April 28. A Pakistani Christian teenager is reportedly fighting for his life after being set on fire by young extremists. Cardinal George Pell has moved out of the Vatican bank and into the Secretariat for the Economy's permanent offices. The Vatican has released the papal liturgical calendar for April to June. Peter Berger says the Pope's comment about the Armenian genocide is "political catnip" for Turkish president Recep Tayyip Erdoğan. Michael Sean Winters argues that Francis's Misericordiae Vultus is "the best papal bull ever". And a papal iPad has raised £20,700 ($30,500, €28,700) at an auction in Uruguay. Follow me on Twitter @lukecoppen for updates throughout the day.