From: here@is.invalid   
      
   Thermoelectric Heating Comes In From the Cold   
   ...   
   ...   
   A decade ago, thermoelectric heating--which relies on the   
   thermoelectric effect, in which electrons are pulled from one material   
   to an adjacent material when both are heated--still required toxic or   
   rare materials such as lead and tellurium. Because the thermoelectric   
   effect is reversible, it also opens the door to cooling, with none of   
   the environmental impact of using liquid refrigerants, or requiring   
   industrial waste heat to be recovered as electricity.   
      
   https://spectrum.ieee.org/thermoelectric-heating   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)