Born in China in 1912, Chien-shiung Wu came to the United States to study physics at the University of California at Berkeley. A meticulous researcher, she joined her former professor, Dr. Oppenheimer, on the Manhattan Project to find ways to produce radioactive uranium for the atomic bomb and improve radioactive detectors. Establishing herself as a world-renowned experimentalist in nuclear physics, her confirmation of nonparity in weak forces—that is, that right and left symmetry do not exist when atoms are in a weakened, less stable state—rocked the physics world.