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In Feynman's famous book QED, he repeatedly reminds us that we must include the possibilities of photons traveling faster than light and slower than light to get the right answers. At least for short distances, short times. For longer distances, longer times, those possibilities cancel and the average speed, c, is adequate.
Is this because of uncertainty, or a fluke in the math, or some other physics?
Is this because of uncertainty, or a fluke in the math, or some other physics?