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16 Jul 2012, California, USA --- FILE PHOTO - Yahoo, Inc. named Google executive Marissa Mayer to be its next CEO, its fifth in five years. PICTURED: July 7, 2008 - Mountainview, California, U.S. - MARISSA MAYER, Google's VP of Search and User Experiences on the Google campus. Mayer was the first woman hired by Google, in 1999, and one of their first 20 employees. (Credit Image: © Martin Klimek/ZUMA Press) --- Image by © Martin Klimek/ZUMA Press/Corbis

ROM15 CIUDAD DEL VATICANO (VATICANO) 17/4/2013 El papa Francisco durante la audiencia general en la Plaza de San Pedro, en el Vaticano, hoy, 17 de abril de 2013.EFE/MAURIZIO BRAMBATTI

US President Barack Obama and First Lady Michelle Obama make their way across the South Lawn upon return the White House on April18, 2013 in Washington, DC. Obama returned from Boston after attending a memorial service for the victims of the Boston Marathon bombings. AFP PHOTO/Mandel NGAN

China's Li Na celebrates after victory in her women's singles semi-final match against Russia's Maria Sharapova on the eleventh day of the Australian Open tennis tournament in Melbourne on January 24, 2013. AFP PHOTO/GREG WOOD IMAGE STRICTLY RESTRICTED TO EDITORIAL USE - STRICTLY NO COMMERCIAL USE TOPSHOTS

Director Steven Spielberg attends the 85th Academy Awards Nominees Luncheon at the Beverly Hilton Hotel on February 4, 2013 in Beverly Hills, California. AFP PHOTO / Robyn Beck