XPost: sci.math   
   From: osu@ssscos.gr   
      
   Jan Panteltje wrote:   
      
   >  Researchers are testing how turbulence behaves at extreme speeds, a   
   >  critical hurdle for designing these aircraft. Their laser-based krypton   
   >  experiments suggest turbulence at Mach 6 behaves more like slower   
   >  airflow than expected.   
      
   you talk about air density, my friend, which is optional auxiliary.   
      
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