How will life on Earth end? International nuclear bombardment? Another asteroid? Enslavement by aliens? The devouring of all of our resources by a Skynet-esque batch of self-replicating microscopic robots? You laugh, but a lot of people (including a batch of anti-science terrorists) believe our demise will come in the form of self-replicating nanobots. So let's take a look at whether such a thing could happen, and what we could do to stop it.
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