Abstract
It was just nine years ago this month that physicists learned to their astonishment that left-handedness and right-handedness are built into the universe at the most fundamental level. Until December, 1956, they had assumed that if an event is possible, its mirror image is also possible, and that if one looks at some real event in a mirror, what one sees could also actually happen. This was known as reflection symmetry, and it forms the basis of the parity principle. In the summer of 1956 certain puzzling phenomena in nuclear physics led T. D. Lee and C. N. Yang to question the principle’s general validity. In a few months C. S. Wu, Ernest Ambler, Dale D. Hoppes and R. P. Hudson had demonstrated that the phenomena clearly violated the principle.
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