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What is Grey Goo?

 , updated on April 14, 2016
Grey goo is a hypothetical existential risk whereby self-replicating nanotechnology would replicate so quickly as to consume all the world's resources within a short time frame, leaving the world awash in small robots that collectively resemble grey slime.
Overview: Grey Goo
The potential for self-replicating nanotechnology such as nanobots to replicate to the extent that they consume all available resources of a planet.
Engines of Creation (book), Eric Drexler, 1986
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Upside Risk
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