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Comment Group speed (Score 1) 393

While you cannot exceed speed of light, sure having faster-then-light group speed can help in some applications!
Look at it from a simple example - a sattelite flying above the Earth that sends some file. As long as it covers large area, you can propagate this file faster then it'd took sending it through wires. Yes, it'll require "preparation" (you need to upload file to satellite first), but you'll get faster file distribution in the end. Each recipient gets his file at a speed of light, but group bandwidth increases immersely.

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