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sed, it is usually asserted that they travel very close to the speed
of light, which was responsible for people thinking they were
probably massless. But the statement 'close to the speed of light' is
meaningless. A particle is either traveling at the speed of light or
it is not, and there are no degrees of closeness to it. So this
choice of phrase obviously means that physicists always observe
neutrinos to be traveling close to the speed of light in their
lab-frame. But how can *all* neutrinos, no matter how and where they
were produced, appear in the lab-frame to be traveling close to the
speed of light? Surely there should be plenty of neutrinos floating
around at nice slow speeds relative to the E