Nobel laureate Chen-ning Yang speaks at the launch of the first joint seminar by the Chinese Academy of Sciences (CAS) and Leopoldina,the national academy of Germany, in Beijing on Monday. Yang gave up US citizenship in 2017 to officially become a CAS academician. He won the 1957 Nobel prize in physics with China-born US colleague Tsung-dao Lee for their work on parity laws. Photo: VCG

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