If one attaches two different sorts of metal together then due to differences in expansion coefficient together they’ll curl (a bimetallic strip). If one then cuts them into a shape so that they’ll inch across a surface if you change the ambient temperature then you may call that a robot? (“eh give it up, some words just kinda lose their meaning; can’t fight linguistics.” but but to decimate just means to destroy a tenth, just a tenth i tells ya! “[eyes-skyward emoji]”)
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