This story appears to be jumping the gun a bit: Micro-robot that can clear arteries.
Larry Greenemeier over at Scientific American appears to be skeptical: Not seeing evidence of artery-cleaning nanobots
And wouldn't something so prominent be found on the universities own website? http://chonnam.ac.kr/en/, I can't find a mention of it anywhere.
So while cool and impressive and probable in some near future, I think it is premature to say it has already been invented. At least the jury is out until we have more concrete evidence.
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