Pope Benedict XVI

Pope Benedict XVI blesses the pilgrims and faithful gathered in St. Peter's Square at the Vatican, as he arrives to preside over his weekly general audience, April 26, 2006. The Pope marked the 20th anniversary of the Chernobyl nuclear disaster on Wednesday by issuing a plea for energy, nuclear and otherwise, to be used in the service of world peace.

Credit: PATRICK HERTZOG/AFP/Getty Images