The Builders are in fact destroyers, their name ironic. They are both biological and mechanical. They can pass for human beings as well as can the Communitarians, but each Builder is a community unto itself, a collection of billions of nanoanimals—microbe-size creatures programmed like machines, each to perform its specialized tasks—that together can assume the appearance of a man or woman, but can also deliquesce and operate as a swarm of individuals. Each nanoanimal is intelligent in the most basic sense, with a small amount of memory—but their shared intelligence and memory equals that of a
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