How close are scientists to making nanorobots that go inside the body

It depends on what you think of as nanorobots. There is a lot of hype about miniature versions of metal robots running around in the body or wreaking havoc on the world, but this is not the reality. But if you think of a "robot" as a functionalized nanoparticle that goes to a specific place in the body to do a specific thing, then nanorobots already exist; one example is drugs that are inserted into nanoparticles of clay because clay seems to go straight into the cells where the drug by itself wouldn't.

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