Breakthroughs in energy generation using nanomaterials—like their enabling of better supercapacitors or photovoltaics—often grab the headlines. But it is in the unheralded area of energy savings that nanomaterials are perhaps making the biggest inroads. Graphene-based ink that can be printed on a variety of materials and into just about any configuration. The system takes advantage of graphene’s minimal thermal mass so the heat can be turned on and off quickly, and leverages graphene’s large surface area so that energy isn’t wasted in heating up the heater itself.