Anthropology
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Ah yes signs and symbols. Surely no alien ever has heard of those.
Humans vibrate the air in different and complicated ways. One vibration pattern humans like, another vibration pattern they don't like. sure this "speech" thing is really complicated. also symbols squibbled on surfaces. language, am I right?
Instead of just using brain-to-brain radio waves like any civilized species would. Pathetic.
They are made out of meat
What are you? Some sort stelliferous era primitive? We of the degenerate/blackhole era use quantum entanglement for daily communication.