A new invention called the Joulie is specifically designed to keep your coffee at a Joulie is made of a metal shell that releases a phase-change material that melts at exactly 140 degrees. The Joulie, or Joulies, depending on your mug size, will use the heat absorbed from the beverage to keep it at an optimal temperature.
It is unknown how putting a piece of metal in your coffee will effect it's taste.
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