From: gossg@gossg.org   
      
   MrAnderson  wrote:   
      
   >So, is it possible to make hybrid atoms with the neutron or proton replaced   
   by different particle? I know you can switch electrons with muons, but is it   
   possible with nucleons? And also, would it allow us to make some interesting   
   materials?   
   >   
   >This question came to me When I was thinking about airships in my sf   
   universe, and which gas would be best for lifting them. Because I don't like   
   neither hydrogen (flammable) or helium (makes many flight procedures more   
   complicated and adds a lot of    
   equipment)   
   >   
   >Any ideas if that would work out?   
      
   "flammable" is nothing compared to the gamma that positronium   
   produces.   
      
   https://en.wikipedia.org/wiki/Exotic_atom   
   --   
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