Yang, Chen Ning (1922–)
Chinese-born US physicist who shared with Tsung Dao Lee
the 1957 Nobel Prize in Physics for their studies of violations of the conservation
of parity. Yang and Lee studied the decay
of K-mesons, which seemed to break down
in two different ways, and in 1956 they concluded that in these weak interactions
(see weak force) parity need not be conserved.