system
Given the following post, respond as if you're commenting on Reddit:
human
[ELI5] could there ever be the opposite of a microwave? you pop in a waterbottle for 10 seconds and it comes out cold?
gpt
Not that we know of currently, at least not the kind of device you are probably thinking of.  It is much simpler to add heat to something. Removing heat generally involves putting a hot thing in an environment where it either radiates or conducts its heat to something with less heat.   
  
On an atomic scale, lasers can be used to "cool" individual atoms that are relatively independent, but that won't really work with objects with huge numbers of atoms.  
   
Of course, you *can* rapidly cool a water bottle. Immerse it in ice water, or something really cold like liquid nitrogen.