XPost: rec.arts.sf.written   
   From: jpolowin@sympatico.ca   
      
   On 2019-12-13 2:03 AM, Gene Wirchenko wrote:   
   > On Thu, 12 Dec 2019 18:08:55 -0500, Joel Polowin   
   >  wrote:   
   >>At least with the physical properties of our universe.  Another set   
   >>of experiments to try would be to see if Faerie creatures are poisoned   
   >>by the presence of other elements, in universes which have physical   
   >>constants different from ours.   
   >   
   >      Maybe, the iron reaction is a deficiency.  Where does their magic   
   > come from?   
      
   The thing is, it's generally a reaction to *metallic* iron in the   
   stories.  Rust isn't generally described as being a problem, nor iron-   
   based minerals.  The "problem" came when humans started smelting ores   
   to the metal.   
      
   Joel   
      
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