Chien-Shiung Wu: the experimental physicist who showed that nature was not perfectly symmetrical
Chien-Shiung Wu (1912–1997) was a Chinese-American physicist and one of the great figures of 20th-century experimental physics, recognized for her work in nuclear physics and radioactivity. Her name was forever linked to the famous 1956–1957 experiment that showed that nature, in certain subatomic interactions, does distinguish between left and right, overturning the idea that parity was always conserved. This result profoundly transformed particle physics and changed the way we understand one of the most important symmetries in modern science.
Born in China in 1912, Wu was trained in an unusual context for a woman dedicated to science at that time and ended up developing her career in the United States, where she became an expert in extremely precise experimental techniques. Throughout her career, she worked on topics such as radioactivity, uranium-235 fission, and nuclear physics, and also participated in research related to the Manhattan Project during World War II. Her laboratory skills were so extraordinary that she became known as the “First Lady of Physics” and, occasionally, as the “Chinese Marie Curie.”
Her most famous contribution came when theoretical physicists Tsung-Dao Lee and Chen-Ning Yang proposed that parity might not be conserved in the weak interaction, a revolutionary possibility for the time. Wu then designed an experiment with cobalt-60 cooled to very low temperatures and observed that beta decay did not behave symmetrically with respect to a mirror reflection, demonstrating that this supposed universal law had exceptions. It was a historic discovery: it not only confirmed one of the boldest ideas in 20th-century physics but also forced a rewrite of principles that seemed firmly established.
Although the 1957 Nobel Prize in Physics was awarded to Lee and Yang for the theoretical proposal, Wu was left out of the award despite having conducted the decisive experiment that verified the phenomenon. This omission is remembered today as one of the most notorious examples of the invisibilization of experimental work and the contribution of women in the history of science. Over time, however, she received important recognitions, including the Wolf Prize in Physics in 1978, and her figure has become a symbol of scientific excellence, experimental rigor, and intellectual perseverance.
In addition to her scientific legacy, Chien-Shiung Wu inspires with the clarity with which she embodies an uncomfortable but powerful truth: sometimes the history of science is not only about discovering how the universe works, but also about correcting who it chooses to remember. That is why, at ByProfeSolmar, we celebrate her story with products that combine art and knowledge, and that invite us to carry in our daily lives the memory of those who forever broadened our vision of the world. The magnetic bookmark dedicated to Chien-Shiung Wu not only accompanies your readings: it also reminds us of a scientist who helped demonstrate that even the most elegant symmetries can be broken.
