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> grow at the same rate as the challenges we face

Given that the challenges grow exponentially as we mess more and more things up, I guess the objective really is grey goo.

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These don't reproduce in that way though. They require existing skin cells that they then corrall into balls akin to themselves. Even if grey goo was a serious existential risk (it isn't because the classic doomsday scenario ignores energy density and heat dissipation as factors), this is not really talking about the same mechanism.

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