Someday, you might be able to stick a temporary tattoo on your skin that's wired to light up or act as a display -- one that's made out of hybrid graphene. If you regularly read Engadget, then you're most likely familiar with graphene: It's that ultra-thin miracle material companies and researchers are using to develop tough and flexible experimental devices these days. The hybrid graphene structures used to make these electronic tattoos, however, are lot more stretchable and transparent, so they continue to work even if you fold them or pull them taut. In addition to acting as a tattoo for purely aesthetic purposes, this material developed by Korean scientists from Ulsan National Institute of Science and Technology (UNIST), Korea Advanced Institute of Science and Technology (KAIST) and Electronics and Telecommunications Research Institute (ETRI) have other possible applications. It can also be used as a biosensor to monitor people's health or to make flexible displays and circuits.