In pictures:Nanotechnology - Building the future from the bottom up
Science fiction

Nuclear subs that course through the blood to shoot cancerous tumours with a laser; self-replicating nanobots that escape from a lab to devour the Earth in a "grey goo" this is all the stuff of airport novels.

The physics at this scale tells us that tiny propellers, for example, simply would not work in the way envisaged.

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