Scientists are exploring a wealth of ways an alien civilization might make itself known to us. One of the most imaginative would be to plant obviously deliberately arranged sequences in human DNA. That would guarantee humans would not find the evidence until we had developed the technological sophistication to read the DNA code. Scientists believe large chunks of that code is unnecessary, so presumably a message inserted there would not affect individuals.
Such a scheme would seem to require an alien visitation of Earth to physically introduce the message. It would also seem to require an intimate familiarity with the DNA code. If that code is unique to life on Earth, gaining such familiarity may mean aliens were here for a very long time.
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