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What do we mean by "intelligent life," or even "life"? Not a flip question, I'm serious. I think life on earth is defined by "having working dna", right? It doesn't seem likely that standard will apply universally, so I think intelligent life is supposed to mean sentient life, which how do you know if something is sentient or not?
One of my favorite readings is from one of Kurzweil's books (forget which one) where he puts forward a convincing proof that there are planets which right now are completely inhabited by nano-technology.
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