Though masses of uncontrolled replicators need not be grey …
Though masses of uncontrolled replicators need not be grey or gooey, the term "grey goo" emphasizes that replicators able to obliterate life might be less inspiring than a single species of crabgrass.
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reminds me of your langoliers post awhile back. probably not analogous (langoliers were large) but reminds me none the less.