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By Fang Zhe and Fang Zhe | Aug. 23, 2015Mei Xiang, a female giant panda at the Smithsonian's National Zoo, pictured in this December 19, 2011 file photograph, gave birth to her second cub with Tian Tian as the result of artificial insemination. (Fang Zhe/Xinhua/Zuma Press/MCT)