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In this Jan. 22, 2018, photo released by China's Xinhua News Agency, cloned macaques Zhong Zhong and Hua Hua sit in a lab at the non-human primate research facility of the Chinese Academy of Sciences. For the first time, researchers have used the cloning method that produced Dolly the sheep to create two healthy monkeys. That brings science an important step closer to being able to do the same with humans. (Jin Liwang/Xinhua via AP)