Find the letter F
This is a very interesting test that might have a suprising outcome. The test is “Count all letters F in the text below”.
SULT OF YEARS OF SCIENTI
FIC STUDY COMBINED WITH
THE EXPERIENCE OF YEARS…
So please count the number of Fs in the paragraph above.
Done? Then click read more….
How much?
Wrong! There are more than 3 or 4. This is not a joke. Read the paragraph again. There should be 6 Fs within the paragraph….retry before you read the solution below.
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Solution: your brain cannot process the word “OF”. Interesting, not?






I got only 5 the first time. I missed the second "of" in "of years of". If you read the paragraph then you would miss an f or two, but if you just look for the "f" I think you won’t miss any.
I think it’s too early for me to see all the Fs.
Almost got me. I had to recount several time and keep in mind that I need to count ALL the letter F. I almost didn’t count the F from word OF.
i was going to say 3, but noticed to more at teh very end so FIVE!! =)
oops got me…wrong again…hahaha 6
This is one of the best optical illusion. Thanks. I counted 6 the first time. Guess how I did it - count backward. Why would I count backward? Because there was a hint of a trick question. When I look specifically for the letter "F" (not reading but forward) for the first time, I got 5. A blind spot had been created..neat trick.