Although not nearly as well-explored as how we would answer "the phone" if we make contact with an extra-terrestial civilization, there's some interesting material for sci-fi writers in the theory of "Grey goo": self-replicating nanomachines that increase in numbers until they take over the world...
More background information: Metafilter: Grey Goo, Foresight Institute
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Anders Jacobsen [extrospection.com photography] |