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Tall Building

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> OK, this is probably not the forum for this, but it has been bugging
> me for a while.  Since there are so many brilliant minds on the listserv,
> and the problem does involve "buildings":
> Lateral Thinking Exercises
> 1) There is a man that lives on the top floor of a very tall building.
> Everyday he gets the elevator down to the ground floor to leave 
> the  building to go to work.  Upon returning from work though, he can 
> only  travel half way up in the lift and has to walk the rest of the 
> way unless it's raining!
> WHY?
> Thanks in advance.