JIMO, March 21, 2016 -- Pupil Shi Haonan (1st L) and his classmates experience a branchistochrone project at a community science museum in Jimo City, east China's Shandong Province, March 21, 2016. The community science museum provides 50 interactive exhibits for free to residents and teenagers. (Xinhua/Liang Xiaopeng)
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