From Spiegel Online:
Materials to keep drinks cold or hot for longer have been around for quite a while. Now a pair of German scientists has come up with a high-tech mug they claim keeps coffee at the perfect temperature.
The idea came to the researchers at the Christmas market in the Bavarian town of Rosenhiem. "We got upset because the mulled wine" -- Glühwein, in German -- "was always either too hot or too cold," say Klaus Sedlbauer, the head of the Fraunhofer Institute for Building Physics (IBP), and his colleague Herbert Sinnesbichler. "We had to find a solution."
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