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Heat-Sensitive Mug Shows the Northern Lights When You Pour in Hot Liquid

It’s not hard to find a heat-changing mug that displays an impressive picture, but this design really reaches for the sky. ThinkGeek recently released a $15 mug that reveals the aurora borealis, the astronomical event often called the northern lights. When empty, the outside of the ceramic cup shows a blank night sky—but add a little coffee, and the mug brightens right up. The heat from your beverage causes a stream of vibrant green colors to appear along the container’s side. (Source)