Vanilla is a product of Lussumo:Documentation and Support.
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2) That c, the constant with that value of the fastest speed possible, turns up all over the place in physics. Sometimes in things that have nothing to do with light or photons. c is really a property of the universe in general, rather than just light in particular.
Just read Ariana's SCIENCE. I think she should have a weekly science thread.
what, in non-vacuums, slows light down
You know, I really don't know where the "tachyon" thing comes from.