Young priests wait for the arrival of Pope Benedict XVI to serve Sunday mass at the Eastern Czech city of Brno on September 27, 2009.The trip by the head of the Roman Catholic Church comes shortly before the 20th anniversary of the Velvet Revolution, a peaceful coup that toppled the communist rule in the former Czechoslovakia in 1989. Pope Benedict XVI warned Sunday that scientific and economic progress are forces for good and evil as he addressed 120,000 pilgrims. By Joe Klamar/Getty.