Oh those industrial designers always seem to impress me... This time it's the portable beverage heater designed by Seungheon Lee. The molded plastic, single-use device is clipped to the side of a mug and creates heat via fuel cells. The long portion stays immersed in the liquid and thermographic ink changes the logo when the beverage is hot. It's just a concept design at the moment, but I can see something like this coming to market in the future.
Source: Yanko Design
The Portable Beverage Heater allows a sleeker, cleaner alternative to heating up your coffee with a USB pad. It also solves the constant reheating the cup issue that us tea and coffee drinkers tackle far too often. It's made of a molded plastic, but it's a single-use device that can be clipped to the side of a mug. According to its designer, Seungheon Lee, it creates heat from solid and organic body form using fuel cell and its thermographic ink changes color to indicate when the beverage is hot. Portable Beverage Heater will keep your coffee warm, until your long and tired conference is ended. I could use a handful of those. 
