"According to the folks at Guinness World Records, National Geographic Kids just created the world's smallest magazine cover. It measures 11 by 14 micrometers, roughly the size of a red blood cell—so small that 2,000 of the covers could fit on a grain of salt.
The cover was etched into plastic using an IBM silicon chisel with a tip that's 100,000 times smaller than the point of a pencil. The image, chosen by readers, shows twin pandas. Aww!
Obviously this microscoping approach to printing isn't going to do much to increase readership. The technology is actually expected to be used for applications like security tagging of passports and artwork."