This is not mine.
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Ask a friend to count the number of F's in the following text.
FINISHED FILES ARE THE
RESULT OF YEARS OF SCIENTIFIC
STUDY COMED WITH THE EXPERIENCE
OF THE YEARS.
Ther are six F's in the sentence, but most people only count three.
This is because many people's brains do'nt register that the word of contains an F.
Anyone who counts all six on the first try is a genius.