Jason Garcia poses as The Joker from Batman at the 2015 Comic-Con International in San Diego, California, July 9, 2015. (Photo by Sandy Huffaker/Reuters)

Vendors selling candied haws wait for customers at the Harbin Ice and Snow Festival in Harbin, China, January 4, 2016. The festival is open from Jan. 5 till Feb. 5, 2016, and is aimed at attracting both foreign and local visitors to experience the beauty of the ice and snow. (Photo by Wang Zhao/AFP Photo)

Labourers pour molten iron into a container at a foundry in Xiangfan, Hubei province in this July 2, 2010 file photo. Iron ore is enjoying its biggest rally in years, outpacing copper and oil so far in 2016, but still weak forward prices show it may be tough to stretch the bullish outlook. Improving steel prices in top market China are helping fuel iron ore's climb as producers gear up for a seasonal uptick in demand. Yet there is no shortage of doubters who see gains in the bulk commodity as fleeting given a large glut and challenges for China's economy. (Photo by Reuters/Stringer)

2016 Rio Olympics, Athletics, Final, Women's 200m Final, Olympic Stadium, Rio de Janeiro, Brazil on August 17, 2016. Photographers take pictures of Elaine Thompson (JAM) of Jamaica after she won the gold. (Photo by Gonzalo Fuentes/Reuters)

In this Saturday, September 5, 2015, photo, three women in costumes look at sea life swimming above them during a private party held at the Georgia Aquarium as part of Dragon Con in Atlanta. The convention draws fans from around the country to take part in sci-fi and fantasy costume contests, a massive parade through downtown Atlanta and educational seminars about science and costume making. (Photo by Ron Harris/AP Photo)

A view of a stampede is seen during a New Year's celebration on the Bund, a waterfront area in central Shanghai, December 31, 2014. The stampede killed at least 35 people and injured 43 during New Year's Eve celebrations in Shanghai, on the city's famed waterfront tourist strip known as the Bund, authorities said. (Photo by Reuters/Stringer)

Members of the new BFEplus anti-terror unit of the German federal police holds a G36C automatic weapon after taking part in a capabilities demonstration at a police training facility on December 16, 2015 in Ahrensfelde, Germany. The BFEplus, whose acronym stands for Beweissicherungs und Festnahme Einheit, or Evidence Safeguarding and Arrest Unit, is to support the GSG9 police special forces unit in containing domestic terror threats. Germany is on high-alert following the November Paris terror attacks and a credible threat at the Germany vs. Holland football match in Hanover. (Photo by Sean Gallup/Getty Images)

Ethnic Miao men wearing traditional masks smear dust on a woman's face to wish her good luck during local celebration event for Lunar New Year in Liuzhou, Guangxi Zhuang Autonomous Region, China, February 16, 2016. (Photo by Reuters/Stringer)