Caption

Former US President Bill Clinton delivers remarks on the second day of the Democratic National Convention at the Wells Fargo Center, July 26, 2016 in Philadelphia, Pennsylvania. (Jessica Kourkounis/Getty Images)

Caption

People watch a news report on North Korea's first hydrogen bomb test at a railroad station in Seoul on January 6, 2016. (JUNG YEON-JE/AFP/Getty Images)

Caption

Syrian internally displaced people walk in the Atme camp, along the Turkish border in the northwestern Syrian province of Idlib, on March 19, 2013. (BULENT KILIC/AFP/Getty Images)

Caption

Muslim women demonstrating on January 17, 2004 in Paris, France. (Pascal Le Segretain/Getty Images)

Caption

Russian President Vladimir Putin at Defender of the Fatherland Day on February 23, 2015 in central Moscow, Russia. (Sasha Mordovets/Getty Images)

Caption

A pump jack and surface water at oil well and fracking site in Shafter, over the Monterey Shale, San Joaquin Valley, California. (Citizens of the Planet/Education Images/UIG via Getty Images)