Nick_Tarleton comments on Infinite Certainty - Less Wrong
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First, an individual particle can briefly exceeed the speed of light; the *group* velocity cannot. Go read up on Cerenkov radiation: It's the blue glow created by (IIRC) neutrons briefly breaking through c, then slowing down. The decrease in energy registers as emitted blue light.
Breaking through the speed of light in a medium, but remaining under c (the speed of light in a vacuum).