Periodic oscillations have been observed in what should be straightforward exponential decay curves of two radioactive isotopes. An entirely mysterious phenomenon, its proposed cause seems equally exotic.
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Walker, P. A neutrino's wobble?. Nature 453, 864–865 (2008). https://doi.org/10.1038/453864a
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DOI: https://doi.org/10.1038/453864a
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