From: helbig@asclothestro.multivax.de   
      
   In article <9393a67c-112a-4e94-a04c-88e295b23456@googlegroups.com>, John   
   Heath  writes:   
      
   > I would like it if you start a thread on neutrinos as I have a beef with   
   > kids today going on and on about what a neutrino is while ignoring   
   > flavor change problem. A tauon neutrino mass is in the 18 MeV range so   
   > how could a neutrino going through flavor changes be clocked at almost c   
   > with a massive 18 MeV boat anchor on it?   
      
   IIRC, the 18 MeV is the upper limit from nuclear-physics experiments.   
   Other bounds, from cosmology and astrophysics, are much tighter.   
      
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