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Scientists build army of 1 million microrobots that can fit inside a hypodermic needle – Cnet

Controlling movement in these tiny machines requires the researchers to shine a laser on minuscule light-sensitive circuits on their backs, which propels their four legs forward. They’ve been designed to operate in all manner of environments such as extreme acidity and temperatures. One of their chief purposes, the researchers say, could be to investigate the human body from the inside

https://www.cnet.com/news/scientists-build-army-of-1-million-microrobots-that-can-fit-inside-a-hypodermic-needle/