Caption

(Michael Bocchieri/Getty Images)

Caption

Workers with Raven Drilling line up pipe while drilling for oil in the Bakken shale formation on July 23, 2013 outside Watford City, North Dakota. (Andrew Burton/Getty Images)

Caption

Iraqi Christians, who fled the violence in the northern Iraqi city of Mosul, attend a mass on May 31, 2015 in Arbil, Iraq. (SAFIN HAMED/AFP/Getty Images)

Caption

A man looks at drones on display at the International Drone Expo 2015 at Makuhari Messe on May 21, 2015 in Chiba, Japan. (Chris McGrath/Getty Images)