Chien-Shiung Wu helped overthrow the law of conservation of parity along with Tsung Dao Lee and Chen Wing Yang. For 30 years, parity was a universal law. The theory states that parity was when an event and its reflection were the same. Scientist believed that the conservation of parity applied to all events. Chien-Shiung Wu helped to disprove this theory. She found this when studying the electrons at a low temperature. Wu did most of the work. The Nobel Prize committee did not acknowledge her. They did recognize her two male partners who won the award.