XPost: alt.usage.english   
   From: nospam@de-ster.demon.nl   
      
   Peter Moylan  wrote:   
      
   > On 20/09/24 19:30, Helmut Richter wrote:   
   >   
   > > I like much more those thumb rules that actually allow you to estimate   
   > > orders of magnitude, e.g.:   
   > >   
   > > 1 year ? π · 10? sec ? 31415926.54 sec   
   > >   
   > > or   
   > >   
   > > 1 year ? √10 · 10? sec ? 31622776.60 sec   
   > >   
   > > or, only for those wanting more precision, the arithmetic mean of the two   
   > > which has three leading digits correct.   
   >   
   > The one non-metric measurement that I find useful is "one foot per   
   > nanosecond".   
      
   Impossible to go that fast,   
      
   Jan   
      
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