Graphene electronic tattoos can be applied to the skin with water
(PHYSorg.com Nanotechnology)

Researchers have designed a graphene-based tattoo that can be directly laminated onto the skin with water, similar to a temporary tattoo. But instead of featuring artistic or colorful designs, the new tattoo is nearly transparent. Its main attraction is that graphene`s unique electronic properties enable the tattoo to function as a wearable electronic device, with potential applications including biometric uses (such as measuring the electrical activity of the heart, brain, and muscles), as well as human-machine interactions.