Two top Chinese-American scientists have dropped their U.S. citizenship

Two top Chinese-American scientists have dropped their U.S. citizenship

BEIJING -Two top Chinese scientists, one a Nobel laureate and the other a winner of a top computer science prize, have renounced their U.S. citizenship to become citizens of China. The Chinese Academy of Sciences (CAS) confirmed this week that Yang Chen Ning, 94, who shared the Nobel Prize in Physics in 1957, and Andrew Yao (Yao Qizhi), 70, the A.M.

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