Visitors view a lid painted with equation at the Institute of Physics in the Chinese Academy of Sciences (CAS) in Beijing, capital of China, May 19, 2018. The 14th CAS "Public Science Day" kicked off on Saturday. (Xinhua/Jin Liwang)
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Visitors view a lid painted with equation at the Institute of Physics in the Chinese Academy of Sciences (CAS) in Beijing, capital of China, May 19, 2018. The 14th CAS "Public Science Day" kicked off on Saturday. (Xinhua/Jin Liwang)
