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People throw mud onto each other at a crop field during Hucang Festival at Zhangjiajie, Hunan province June 5, 2013. Hucang Festival is a traditional celebration among local ethnic Tujia people, who believe the muddier a person is after the celebration, the better the harvest he or she will enjoy.

China Daily/Reuters

People throw mud at each other in a crop field during Hucang Festival at Zhangjiajie, Hunan province. Read more

A women rides on her horse past a blooming rapeseed fields in bloom near Ottbergen, northern Germany, Tuesday, May 21, 2013. (AP Photo/dpa, Julian Stratenschulte)

Julian Stratenschulte/AP

A women rides her horse past rapeseed fields in bloom near Ottbergen, northern Germany, on Tuesday. Read more

Cambodian boys ride bicycles as they head to school by passing paddy rice field at Krang Tnung village on the outskirt of Phnom Penh, Cambodia, Tuesday, May 7, 2013.

Heng Sinith/AP

Cambodian boys ride bicycles as they head to school by passing paddy rice field at Krang Tnung village on the outskirt of Phnom Penh in Cambodia.