Muslim pilgrims wear masks to prevent infection from the Middle East respiratory syndrome in the holy city of Mecca, Saudi Arabia, on Tuesday. Hasan Jamali/AP hide caption

Vocalist Amelia Meath and electronic musician Nick Sanborn are Sylvan Esso. DL Anderson/Courtesy of the artist hide caption

A woman casts her ballot at a polling station on May 11 in Hartsizk, Ukraine. Pro-Russian separatists are claiming independence after the referendum in cities across eastern Ukraine. Brendan Hoffman/Getty Images hide caption

A monument to Ukrainian writer Taras Shevchenko is silhouetted against a sign advertising Russia's natural gas giant Gazprom in Moscow. Gazprom has dramatically increased the price it charges Ukraine in recent months. Alexander Zemlianichenko/AP hide caption

McDonald's was the featured sponsor of the annual meeting of the California Dietetic Association in 2014. Alan Broadhead/Flickr hide caption

Critics say a new social media policy approved by the Kansas Board of Regents, barring staff and faculty from posting anything "contrary to the best interests of the university," is too restrictive. palebluerobot/flickr hide caption

Several high-profile commencement speakers have resigned in the wake of student protests this graduation season. iStockphoto hide caption