From: tkoenig@netcologne.de   
      
   J. J. Lodder  schrieb:   
      
   > For example, is a centimeter compatible with a nanosecond?   
   > No, of course not, well indoctrinated kiddies will tell you   
   > with the wisdom of 1793.   
   > However, these days the nanosecond equals 29.9792458 cm (exactly)   
      
   Time certainly doesn't equal length, and trying to use definitions   
   of units in such a way is misleading at best.   
      
   Otherwise, tell me what reasonable result you get if you add a   
   second to a meter.   
      
   > This is what your little GPS unit is doing for you:   
   > it counts, adds, and multiplies with all those nanoseconds,   
   > and presents the results of it all in meters or miles.   
      
   It converts the results.   
      
   > In a very real sense the metric system came too early.   
   > (before the relevant physics was well enough understood)   
   > If we could start all over again   
   > there wouldn't be a separate length unit at all.   
      
   It is certainly useful to have both; if only to avoid the mistake   
   of adding a length to a time.   
      
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