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The question 'Why must massive particles travel at subluminar (or non-invariant)
speeds?' gets replaced by 'Why must massive particles have comoving >(inertial)
frames?'. I'm not sure that the latter is more self-evident than the former.
Answer number 2 assumes more about the structure of matter than I would like. I
suspect an answer can be given that relies much more on the >concepts of
spacetime and mass than on the quantum features of matter. Well, I hope so at