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Probably not.

When a new technology is developed, it is common to consider "worst-case" scenarios. These are imagined situations where everything possible goes wrong, at the worst time, in the worst way.

In this case the scenario goes, *if* it were possible to make self-replicating nanobots, and *if* those bots were somehow out of control, and *if* they could use any material to replicate, and *if* there were no way to stop them... [etc., etc., etc.]... THEN they might just keep on making replicas of themselves until they had reduced the entire planet to nothing but nanobots - often referred to as a "grey goo."

So far we haven't made nanobots. We've made nano-wheels and even a nano-motor, but nothing much more complex than that. As far as I know, we haven't made anything that's self-replicating, even at normal sizes.

Our main threats still seem to be dwindling resources and other, less mysterious problems.

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