President Obama answers questions during his news conference at the White House on Tuesday. Pablo Martinez Monsivais/AP hide caption

itoggle caption Pablo Martinez Monsivais/AP

Musical instruments wait for the arrival of the orchestra during the closing session of the Chinese People's Political Consultative Conference at the Great Hall of the People in Beijing on March 12. Mark Ralston/AFP/Getty Images hide caption

itoggle caption Mark Ralston/AFP/Getty Images

Sheryl Sandberg, Facebook's chief operating officer, speaks at a luncheon for the American Society of News Editors in San Diego. Gregory Bull/AP hide caption

itoggle caption Gregory Bull/AP