Read this sentence:
 
                FINISHED FILES ARE THE RE-
                SULT OF YEARS OF SCIENTIF-
                IC STUDY COMBINED WITH
                THE EXPERIENCE OF YEARS.
 
 
  Now count the the F's in that sentence.  Count them  ONLY ONCE: do
  not go back and count them again.  See below...
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  Answer below:
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  There are six F's in the sentence.  One of average intelligence
  finds three of them.  If you spotted four, you're above average.
  If you got five, you can turn your nose at most anybody.
  If you caught six, you are a genius.
 
  There is no catch.  Many people forget the "OF"'s.
  The human brain tends to see them as V's and not F's.
  Pretty weird, uh?
  It fools almost everybody.

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