A weak spot found in otherwise ultra-strong graphene -- the thinnest, strongest and least permeable material known to science -- could in fact be a boon and could lead to a revolution in fuel cell technology, researchers say. Research at Britain's Manchester University led by Andre Geim -- who shared a Nobel Prize for the discovery of graphene -- has shown that the material is not quite as impermeable as previously though and will, in fact, allow protons to easily pass through it.