A RECENT attempt by Stannard1 to explain the apparent overthrow of parity in the long-lived kaon experiments suggested the possibility of an unseen component of the universe in which matter was of opposite time sense to that in the observable universe.
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Stannard, F. R., Nature, 211, 693 (1966).
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MULLIS, K. Cosmological Significance of Time Reversal. Nature 218, 663–664 (1968). https://doi.org/10.1038/218663b0