Genius: a cup sleeve that expands via endothermic reaction when the cup is filled with hot liquid, insulating your hot coffee and keeping your hand from getting roasted. Utterly horrifying: the end of this video. [Heatswell]
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Genius: a cup sleeve that expands via endothermic reaction when the cup is filled with hot liquid, insulating your hot coffee and keeping your hand from getting roasted. Utterly horrifying: the end of this video. [Heatswell]
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