This see-through patch made of graphene and studded with gold isn't just a fashion accessory or temporary tattoo. It has the capability to monitor your blood sugar levels and deliver diabetes medication. The prototype, designed by Seoul National University assistant professor Dae-Hyeong Kim and a team of researchers, has sensors that can detect your temperature and the pH/chemical composition of your sweat. It then beams the data it collects to an accompanying smartphone app. If the system infers that you need medicine based on the state of your sweat, the app computes for the amount of medication (metformin for type II diabetes) you need. The patch's microneedle array then injects the right amount into your body.