The Ambidextrous Universe

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From where does the difference between left and right come? Is it a fundamental property of the universe, or is it arbitrary?
Parity nonconservationSymmetry (Physics)Particles (Nuclear physics)Fisica NuclearElementarteilchenSymétrie (Physique)Non-conservation de la paritéSymmetrieParität (Physik)Particules (Physique nucléaire)asymmetryelectromagnetism