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Communication other than by sound is viable, we already do communicate in eletromangetic way by our eyes. Further development in mangetic, electromangetic and such is feasible. Telepathy with ways we haven't evolved to use is ok.
Still, it doesn't mean faster than light, which is often potrait with telepathy, physics are againts that. The difference between possible and silly is if it breaks the fundamental rules we now know.
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