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When in a café, there are cases, in which one raises his or her eyebrow because of the coffee that has cooled down when he or she was concentrating on work or having a conversation with another Although one would like to heat up the coffee which has cooled down, there are cases in which he or she does not drink the coffee because it is cumbersome to do so.
The sunlight which blazes the window of a café is one kind of natural energy that is given to us.
Would not it be possible to always keep coffee warm through this energy? The energy of “WARMER TABLE” is supplied through solar heat.