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Geez, I really don't know, but I sort of understood neutrinos were a bundle of energy that had a leading and trailing edge, kind of bell curve. If the measurement at entry of a medium was at the peak of the curve, it was possible for the leading edge of the curve to have already have exited the medium at the time of measuring the entry peak. If the exit measurement was of the leading edge due to distortion of the curve, then it appeared as though the exit was before the entry. Is that all wrong and simplistic ?.
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