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.
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.
(Thanks, JeremyT!)