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MAKE Magazine

• 

  Heatswell - heat activated coffee cup insulation

  Posted: March 30th, 2010, 10:00pm MDT

  
  Heatswell via NOTCOT.

  Pour a hot beverage like coffee, tea, hot chocolate or soup into this thin stackable coffee cup and watch its midsection swell to form a cool insulating collar – a 100% genuine endothermic reaction.

  
  
  

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