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The human mind can do some amazing things. But it can also play tricks on you. See below:
Read quickly the following text and say how many "F"s did you saw:
FINISHED FILES ARE THE RE-
SULT OF YEARS OF SCIENTI-
FIC STUDY COMBINED WITH
THE EXPERIENCE OF YEARS
How many?
3?
4?
There are six F letters ... the human mind doesn't "see" the connecting words - of. The one who sees 6 Fs is a genius, 4 or 5 is rather rare, usually you see 3 and if you see less than 3 ... you need to change your glasses .
Kids, around six year learn to read and they will see all the Fs because they are in the faze of reading letter by letter.