Would be extremely interesting to watch as languages evolve at a rate that makes them hard to distinguish as the same language without a primer on the changes in meanings of words or addition of new words and removal of old ones from use.

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With algorithmic CETI you could at least send some sort of advanced runnable chatbot so they'd get some answers directly. Possibly even actual digitized consciousness if such a thing is possible (which, despite the certainty about this of most techbros, is still to be demonstrated).