BACK in the early 2000s, an awesome thing happened in the New X-Men comics. Our mutant heroes had been battling giant robots called Sentinels for years, but suddenly these mechanical overlords spawned a new threat: Nano-Sentinels! Not content to rule Earth with their metal fists, these tiny robots invaded our bodies at the microscopic level. Infected humans were slowly converted into machines, cell by cell. Read more: [https://www.newscientist.com/article/mg25033340-100-ultra-tiny-nanomachines-are-redefining-how-we-think-of-robots/#ixzz6ukvDXN1K](https://www.newscientist.com/article/mg25033340-100-ultra-tiny-nanomachines-are-redefining-how-we-think-of-robots/#ixzz6ukvDXN1K)