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  Students take an examination on an open-air playground at a high school in Yichuan, China, on April 11, 2015.

Students take an examination on an open-air playground at a high school in Yichuan, China, on April 11, 2015.

  Women pose for the cameras as they make the traditional Korean side dish kimchi, or fermented cabbage, at a charity event at the Seoul City Hall Plaza on November 8, 2011. About 2,000 volunteers made 270 tons of kimchi to give away to needy people during the winter season.

Women pose for the cameras as they make the traditional Korean side dish kimchi, or fermented cabbage, at a charity event at the Seoul City Hall Plaza on November 8, 2011. About 2,000 volunteers made 270 tons of kimchi to give away to needy people during the winter season.

  Muslim pilgrims pray during the annual Hajj pilgrimage in Mecca, September 27, 2014.

Muslim pilgrims pray during the annual Hajj pilgrimage in Mecca, September 27, 2014.