People watch models of aircraft carriers at the Olympic Green 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 watch models of aircraft carriers at the Olympic Green 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)