It is the Periodic Table printed on a single strand of human hair (insert pubic hair joke here). Check out the video of it below:
Created by the nerds -- excuse me, experts -- at the University of Nottingham's Nanotechnology and Nanoscience Centre, the hair was etched using focused ion beams. How tiny is it? So tiny that it could be copied onto a post-it note well over a million times with room to spare.