Wu Jun (L), the crew leader of the fourth Chinese scientific expedition team, and Yu Xingguang, a scientist, pose for a group photo with a Chinese knot at the North Pole, Aug. 20, 2010. The Chinese fourth expedition team arrived at the North Pole on 15:38 p.m. (0738 GMT) Friday, which is the northernmost location ever reached by Chinese scientific expeditions.[Zhang Jiansong/Xinhua]
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