These tiny, medical robots could one day travel through your body - https://www.colorado.edu/today/2023/05/24/these-tiny-medical-robots-could-one-day-travel-through-your-body#:~:text=A%20team%20of%20engineers%20at,places%20inside%20the%20human%20body.

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CU Boulder engineers have designed a new class of “microrobots” several times smaller than the width of a human hair that may be able to treat human illnesses like interstitial cystitis—a painful

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It looks more like a fan propeller to me. Some years ago I studied about swarm robots which could travel through the blood vessels. But those looked different.

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