brother had perished in the Cultural Revolution, and the tombs of her parents had been destroyed. She was greeted by Zhou Enlai, who personally apologized for the destruction of the tombs. After this, she returned to China and Taiwan several times. During the late 20th century, Wu continued to be seen as the top experimental physicist in the world and many continued to ask for her guidance in proving certain hypotheses. Herwig Schopper, who was the director general of CERN, commented that physicists believed "if the experiment was done by Wu, it must be correct." She conducted experiments on Mössbauer spectroscopy and its application in the study of sickle-cell anemia. She researched on the molecular changes in the deformation of hemoglobins that cause this form of anemia. She also did research on magnetism in the 1960s. Wu would later work on Bell's theorem, which showed results that confirmed the orthodox interpretation of quantum mechanics. In later life, Wu became more outspoken. She protested the imprisonment in Taiwan of the in-laws of physicist Kerson Huang in 1959 and of the journalist Lei Chen in 1960. With the help of her teacher Hu Shih, Huang's in-laws were eventually released on bail. Lei's sentence was reduced to ten years by President Chiang Kai-shek. In 1964, she spoke out against gender discrimination at a symposium at the Massachusetts Institute of Technology. "I wonder," she asked her audience, "whether the tiny atoms and nuclei, or the mathematical symbols, or the DNA molecules have any preference for either masculine or feminine treatment", which garnered heavy applause from the audience. When men referred to her as Professor Yuan, she immediately corrected them and told them that she was Professor Wu. In 1975, physics department chairman Serber discovered that Wu had a much lower pay than her male colleagues but that she had never reported on it, so he adjusted her pay to make it equal to that of her male counterparts even if Wu only cared about the research at Columbia. Wu later quipped, In China there are many, many women in physics. There is a misconception in America that women scientists are all dowdy spinsters. This is the fault of men. In Chinese society, a woman is valued for what she is, and men encourage her to accomplishments, yet she remains eternally feminine. Wu's advocacies and conviction maintained a strong priority for the advancement of the