A Swedish company called Intellego Technologies is set to commercialize a special wristband, much like the kind wrapped around your wrist at concerts and music festivals, that can alert its wearer when it’s time to get out of the sun so as to avoid burning or potentially carcinogenic sun damage. The wristband works through an acid-release agent that picks up UV light, and a dye that responds to pH levels in the indicator, starting out yellow and turning pink as exposure time goes on. Read the full story at Gizmodo.