Don&#x27;t worry classic nano-tech robots were pretty much a scifi pipe dream. And if it does work we just have a friendly immune system of bots inside us fighting back. See Diamond Age: Or, A Young Lady&#x27;s Illustrated Primer. The nano-bots there are a pretty reasonable end point for if nano-tech ever actually works (and we don&#x27;t immediately die to grey goo, though parts sound like there were times in the book where it almost happened but the good bots won).