From: nicolaas.vroom@pandora.be   
      
   On Thursday, 4 July 2019 09:19:55 UTC+2, Tom Roberts  wrote:   
      
   > Ultimately, the twin paradox displays the basic geometrical fact that   
   > different paths between a given pair of points can have different path   
   > lengths.   
   >   
   > Tom Roberts   
      
   This is a 'difficult' explanation.   
   The easiest explanation is (?) that this is a physical issue which   
   depends on the inner workings of the clock.   
   More or less the same why moving pendulum clocks on a moving ship don't   
   work properly (moving from A to B and back).   
   Moving clocks working on light signals have the same problem. When such   
   a clock moves with the speed of light, the clock does not tick at all.   
      
   Nicolaas Vroom.   
      
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