For not spoiling the surprise, please follow exactly the instructions.
Please do not scroll down before you've finished every step.
Please read the following text and count how many F it contains:
FINISHED FILES ARE THE RE-
SULT OF YEARS OF SCIENTI-
FIC STUDY COMBINED WITH THE
EXPERIENCE OF YEARS
Finished ? Please scroll down only after you're sure you got the correct number.
OK.
How many ? Three ?
Wrong, it's six !!! Not a joke - count again !
Normally the brain doesn't recognize "OF".
Whoever got all six F right away is genius - recognizing only three is normal.
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