Read the text below and count the number of F's in it (the letter F).
FINISHED FILES ARE THE RE
SULT OF YEARS OF SCIENTI
FIC STUDY COMBINED WITH
THE EXPERIENCE OF YEARS...
Ok, how many did you count? 3?
WRONG! Count again? It should be 6.
Reasoning further down:
The brain cannot process "OF".
Mysterious, or what? Go back and look again!! Anyone who counts all 6 "F's" on the first go is a genius. Three is normal, four or more is quite rare.