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gray goo: n. A hypothetical substance composed of sagans
of sub-micron-sized self-replicating robots programmed to make copies of
themselves out of whatever is available. The image that goes with the term
is one of the entire biosphere of Earth being eventually converted to robot
goo. This is the simplest of the nanotechnology
disaster scenarios, easily refuted by arguments from energy requirements
and elemental abundances. Compare blue goo.
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