People queue at the China Science and Technology Museum in Beijing, capital of China, Sept. 17, 2016. More than 9,000 events will be held across China to mark the national popular science day from Sept. 17-23. (Photo/Xinhua)
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People queue at the China Science and Technology Museum in Beijing, capital of China, Sept. 17, 2016. More than 9,000 events will be held across China to mark the national popular science day from Sept. 17-23. (Photo/Xinhua)