From: fortunati.luigi@gmail.com   
      
   The traveling twin starts and goes back to Earth where he finds his   
   80-year-old brother aged as he is only 10 years old.   
      
   The wristwatch on the twin traveler's wrist marks (of course) the   
   10-year time.   
      
   The earth twin during the years of the trip has been flashing every 10   
   years (his).   
      
   The last lightning is emitted at the time of the return of the ship,   
   when the Earth clock marks the 80-year time and the wrist watch on   
   the twin traveler marks 10 years.   
      
   Calculation (perhaps) impossible is this: at the ejection of the   
   penultimate lightning (when the Earth clock marked 70 years) what time   
   was the watch on the wrist of the traveling twin?   
      
   --   
   Luigi Fortunati   
      
   Credere e' piu' facile che pensare   
   Believing is easier than thinking   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)