Today is International Left-handers’ Day, observed to appreciate left-handedness in a world numerically dominated by righties. There is left-handedness within ourselves as well. But there is a fourth force, known as the weak nuclear force (responsible for radioactive decay), and it breaks left-right symmetry. The Chinese-American physicist Chien-Shiung Wu confirmed in an experiment in 1956 that the weak force does not conserve parity. That the weak nuclear force defies parity symmetry was an important moment in the history of physics.

Source: The Hindu August 13, 2023 16:57 UTC