Polymer words written on human hairs

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.

Link (Thanks, JeremyT!)