Wu experiment

The Wu experiment was a crucial scientific test in 1957 that confirmed parity symmetry in weak nuclear interactions. Parity symmetry suggests nature's physical laws should behave the same if left and right are swapped, like a mirror image. Wu and her team observed that certain radioactive atoms emitted particles asymmetrically—with more particles emitted in one direction than the other—showing that weak forces do not treat left and right equally. This discovery challenged previous assumptions about symmetry in nature and significantly advanced our understanding of fundamental forces in physics.