A group of PhD students from the MIT Media Lab and researchers from Microsoft Research have come up with the ultimate wearable: a temporary tattoo that can turn into a touchpad, remotely control your smartphone, or share data using NFC. The researchers say you can design a circuit using any graphic software, stamp out the tattoo in gold leaf (which is conductive to electricity), and then apply other commodity materials and components that would make the tattoo interactive. Tattoo could be used to turn your skin into a trackpad, designed to change color based on temperature, or you could pull data from the tattoo. In one photo shared by MIT the tattoo even includes LED lights, creating a kind of glowing display on the skin. http://www.theverge.com/circuitbrea...oft-research-gold-leaf-smart-temporary-tattoo