<div>>Another possibility is that Wolfe simply chose to ignore those complications. As an engineer, he is sometimes very technical---see the remarkably elegant explanation presented in this list for the Long >Sun. But he is not really a hard-SF kind of guy, not when details might get in the way, and maybe especially in terms of biology. And he's never proposed non-carbon life or non-iron blood in any story, as >far as I know.<br>
>Even if he considered one of those possibilities (we do know gene transfer is possible), he wouldn't put them out front. I suppose the inhumi do make it impossible to rule out any theory like that.</div>
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<div>Wolfe wrote about a species of mechanical life forms early in his career. The story appears in the collection The Island of Dr. Death and Other Stories and Other Stories. The name escapes me, and I'm not near my bookshelf at the moment. Wolfe's written about non-humanoid, bizarre creatures, but those creatures in the Sun cycle tend to have certain basic similarities. I hate to use a Star Trek explanation, but the Sun series appears to be set more or less in the Earth neighborhood, and the similarities seem to be excused in part by this and by genetic tampering by advanced races (gods). This is creation myth with the gods as aliens.</div>
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<div>The inhumi seem to me to just be a sort of reverse-virus. Instead of them infecting humans, the humans (or other prey) "infect" them with genetic information. Blood is just the medium. Also, this idea that aliens could be non-carbon based is just wild theory. We have no idea what aliens would look like, and in all likelihood they are carbon-based because that's easiest way for life to arise.</div>