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    Hello. I wonder if anybody could help me. Perhaps assist in my challenge. I have been on the hunt for any sort of thermo-dynamic compounds, elements or materials. Now, specifically i am interested in those that can ultimately reduce their temperature and the space around them to that of "cold - freezing", either by reaction with another substance, element or force etc. The substance must be able to return back to room temperature or above (without input, just on its own) and must have a very large frequency of uses, goes or shelf life in a way. Must be able to go to cold with input, return to room or above temperature on its own in time and must be able to do undergo these processes alot more than once. Ideas would be very helpful. Thank you.
 
 
 
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