In experiments conducted at the Brookhaven National Laboratory in 1964,
Fitch and Cronin showed that the decay of subatomic particles called
K mesons could violate the general conservation law for weak interactions
known as CP symmetry. This experiment in turn necessitated physicists'
abandonment of the long-held principle of time-reversal invariance.
The work done by Fitch and Cronin implied that reversing the direction
of time would not precisely reverse the course of certain reactions
of subatomic particles. (See also CP violation.)
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