Tiny robots swim the front crawl through your veins

New Scientist

It's no Michael Phelps, but this tiny magnetic robot swims the front crawl at 10 micrometres per second. Its gold body is flanked by two magnetic arms made of nickel, and applying a magnetic field to the tiny robot makes the arms move. As the researchers switch the magnetic field's direction back and forth, it causes the arms of the nano-swimmer to rotate and propel it forward, just like the arms of a human swimmer doing the front crawl. We don't know how fast Michael Phelps could swim through blood – thankfully, his recent race against a great white shark didn't provide a testing ground.

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