Some people love to take their beverages when too hot and some just can’t stand beverages being too hot. But at times your tongue becomes the victim of a third degree burn all because naively you take a very hot sip, right? However, you can avoid that if you have some colored LEDs and a temperature sensor, because that’s all you need to build a handy temperature sensitive coaster. A red light signifies the drink being very hot, green if it’s just right and white when your tea/coffee goes too cold. Also, there is a tilt switch that re-calibrates the “just right” setting every time you make a drink. It’s a DIY project. You can get the step by step instructions at Instructables. Innovatively nifty kitchen ware!