Tattoos in future can do a lot more than just embellish your skin for eternity. Dr. Heather Clark, associate professor of pharmaceutical sciences at Northeastern University and her research team are now working on digital tattoos that could help save lives in future. These tattoos will use nanosensors capable of reading the wearer’s blood levels of sodium, glucose and even alcohol level, using an iPhone camera. The tattoo will basically send information in regards to the wearer’s blood to a smartphone. In short, this could very well be an information-keeping technology that remains embedded in your skin forever. And yes, these aren’t really visible, if you’re too worried about wrecking your skin, unless you really look for it the digital tattoo that is.