From: tkoenig@netcologne.de   
      
   Christian Weisgerber  schrieb:   
   > On 2025-12-17, Bobbie Sellers  wrote:   
   >   
   >>> BTW, where did this trope start?  It appears early in _Perry Rhodan_,   
   >>> where genocidal wars between the two are part of the historical   
   >>> background, but nothing is ever original in _PR_.   
   >>   
   >> 	Methane breathers in the Lensman stories by Doc E.E. Smith.   
   >   
   > I seem to recall that there were various "poison gas" breathers and   
   > Smith was oddly unspecific about the makeup of their air.   
      
   Methane isn't toxic, but it is of course asphyxiating and burns   
   (or explodes) with oxygen.   
      
   But that reminds me of the description of a very persuasive salesman   
   (was it in Perry Rhodan? It's been so many decade since I last read   
   that...) "He could sell an oxygen apparatus to a methane breather".   
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