A tasseled wobbegong shark (top) lies on the seafloor with the head of a brown-banded bamboo shark in its mouth on the fringing reef of Great Keppel Island on Australia's Great Barrier Reef in August 2011. Reuters/Landov hide caption

itoggle caption Reuters/Landov

Yahoo CEO Marissa Mayer delivers the keynote address at the annual Consumer Electronics Show in Las Vegas earlier this month. Robert Galbraith/Reuters/Landov hide caption

itoggle caption Robert Galbraith/Reuters/Landov

Amanda Knox speaking during a taped interview with ABC News' Diane Sawyer in New York in April. Ida Mae Astute/AP hide caption

itoggle caption Ida Mae Astute/AP

Sen. John McCain, an Arizona Republican, at the annual meeting of the World Economic Forum in Davos earlier this week. His state's GOP leadership has censured him for his "disastrous" record. Ruben Sprich/Reuters/Landov hide caption

itoggle caption Ruben Sprich/Reuters/Landov