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Scientists can lay down extremely accurate blobs of polymer on organic matter, like human hairs, at resolutions high enough to, for example, spell out words in block-caps as pictured here.
Link (Thanks, JeremyT!)Researchers in the laboratory of Boston College Chemistry Professor John T. Fourkas have demonstrated the fabrication of microscopic polymeric structures on top of a human hair, without harming it...
One could imagine, for instance, building devices directly on skin, blood vessels, and eventually even a living cell. While this idea is currently in the realm of science fiction, our results represent an important step in that direction.
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.