7:10am: Before making breakfast you run your forearm across an ultraviolet reader on your wall to check your glucose levels. Your “nano-tattoo” shines back a reading that shows you are in the healthy blood-sugar range. As a diabetic, you used to have to prick your finger and take a blood sample to find out how your blood sugar was, but with the development of a nano-tattoo you now simply have to place your invisible tattoo under an ultraviolet reader.

Heather Clark, inventor of nano-tattoos and an associate professor of pharmaceutical sciences in Northeastern University’s Bouvé College of Health Sciences in Boston, explains that such technology “could be very user friendly, because once the sensor ‘tattoo’ was inserted, it would be easy and painless to take a reading using just light through the skin.” Nano-tattoos are still a long way off but Clark estimates that, if they do become commercially available, they would be very cheap.