Chien-Shiung Wu was an experimental physicist whose genius for precision earned her the nickname 'The Queen of Nuclear Research.' She is best known for the 'Wu Experiment,' which disproved the law of conservation of parity in weak nuclear interactions. This discovery shattered a fundamental assumption of physics—that the universe is symmetrical. While her male colleagues who proposed the theory won the Nobel Prize, Wu was famously overlooked. She also made significant contributions to the Manhattan Project, helping to develop the process for separating uranium isotopes. Wu was the first female president of the American Physical Society.