Villagers cry for their relatives who were killed in an earthquake during a funeral in Longmen village, in Lushan county in southwest China's Sichuan province, on April 21, 2013. Rescuers and relief teams struggled to rush supplies into the rural hills of the area after an earthquake left at least 180 people dead and more than 11,000 injured. (Photo by Associated Press)

In this photo taken Monday, April 29, 2013, carver Jackson Mbatha, 40, poses next to a an unfinished large toy giraffe he is making from pieces of discarded flip-flops, in front of a painted workshop wall at the Ocean Sole flip-flop recycling company in Nairobi, Kenya. The company is cleaning the East African country's beaches of used, washed-up flip-flops and the dirty pieces of rubber that were once cruising the Indian Ocean's currents are now being turned into colorful handmade giraffes, elephants and other toy animals. (Ben Curtis/AP Photo)

Women Wrestlers, Bolivia. Lucha libre (Bolivian wrestling) is one of the most popular sports in the country. Women wrestlers are known as cholitas and have in the last ten years become popular in the sport. Here, Carmen Rosa and Yulia la Pacena perform in a benefit show to raise money for the bathrooms of a school in La Paz, Bolivia, 26 June 2011. (Photo by Daniele Tamagni)

Young man making the O.K. sign. (Photo by George Marks/Retrofile/Getty Images). Circa 1950s

A Chinese bus ushers jump as she pose for a photograph on Tiananmen Square during a plenary session of the National People's Congress held at the Great Hall of the People in Beijing, Wednesday, March 9, 2016. (Photo by Andy Wong/AP Photo)

A girl rides a donkey as another walks by at the Shawqaba camp for internally displaced people who were forced to leave their villages by the war in Yemen's northwestern province of Hajjah March 12, 2016. In northwest Yemen, one of the poorest countries in the Middle East, about 400 families uprooted by the war have been stuck in the Shawqaba camp in Hajjah province for the past year. Residents live in poorly built huts that protect them neither from summer heat nor winter cold in a camp that lacks the most basic services. (Photo by Abduljabbar Zeyad/Reuters)

A paramilitary police officer (right) turns around as hostesses line up for roll call ahead of the Beijing International Automotive Exhibition in Beijing, China, on Monday, April 25, 2016. Tesla Motors Inc. and BYD Co. are among manufacturers showing 147 new-energy vehicles at this year's show. (Photo by Qilai Shen/Bloomberg)