Here's something you didn't have hanging up in your high school chemistry class: the entire periodic table of the elements, etched into a single human hair.
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. That's pretty damned small!