Though graphene is noted for its beautiful symmetry, when you add a few warts and imperfections, it becomes more interesting -- specifically, it has the potential to make fuel cells better and cheaper. Scientists from Northwestern University and other institutions were toying with the material as a hydrogen fuel cell membrane, and found that by knocking out at least four carbon atoms from the normally pristine structure, it performed vastly better. A large number of protons (and nothing else) slipped through imperfections in the atom-thick material in just a few seconds, efficiently generating electricity.