In 1975, a paper by physicist Michael Hart inspired Enrico Fermi to ask the question: where is everybody? He asked it because of the silence of the universe around us–no radio signals, nobody coming in for a landing, indeed, nobody approaching us in anything like a conventionally understandable manner.

Now, whether you believe that extraterrestrials are here or not, a good argument can be made that, even if many of them present such an unconventional picture that we literally cannot recognize them as what they are, some, at least, should be in some sort of more conventional contact with us.
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