Nanotechnology simply refers to very small particles and doesn’t specify the material the particles come from, so when researchers sat down to develop a nanorobot they were faced with literally endless possibilities for its material makeup.
Biological nanobots have technically been created, as have large or conventionally-sized robots with the ability to work on the nanoscale.
But the traditional idea of nanorobots involves them being all or mostly mechanical, and these types of nanobots are the next step in nanotechnology.
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