It can be more than a little frustrating when your glasses fog up — just ask anyone who has worn a face mask over the past two years of the pandemic.ETH Zurich researchers have developed a gold nanocoating that heats glass by up to 46F by absorbing a large amount of infrared radiation, keeping your glasses fog-free in many humid conditions.And unlike conventional approaches, which merely spread water around using hydrophilic molecules, this prevents the condensation from even starting.The 10nm thick coating sandwiches gold between layers of titanium oxide that not only amplify the heating effect through refraction, but protect the gold against wear.ETH is keen to point out that it made the coating using techniques common to manufacturing, such as vacuum-based vapor deposition in a clean room."