From the New York Times:
Joan Hinton, a physicist who worked on the Manhattan Project, which developed the atom bomb, but spent most of her life as a committed Maoist working on dairy farms in China, died on Tuesday in Beijing. She was 88.
…In 1948, alarmed at the emerging cold war, she gave up physics and left the United States for China, then in the throes of a Communist revolution she wholeheartedly admired. “I did not want to spend my life figuring out how to kill people,” she told National Public Radio in 2002. “I wanted to figure out how to let people have a better life, not a worse life.”
In China she met her future husband, Erwin Engst, a Cornell-trained dairy-cattle expert, who went on to work on dairy farms as a breeder while she designed and built machinery. During the Cultural Revolution, they were editors and translators in Beijing.
Ms. Hinton applied her scientific talents to perfecting a continuous-flow automatic milk pasteurizer and other machines. For the past 40 years, she worked on a dairy farm and an agricultural station outside Beijing, tending a herd of about 200 cows.