How many Fs do you see in the text below?
FINISHED FILES ARE THE RE-
SULT OF YEARS OF SCIENTIF-
IC STUDY COMBINED WITH THE
EXPERIENCE OF YEARS.
After you counted the Fs, scroll down...
How many did you count? 3?
Wrong, there were 6. Don't believe it?
Scroll back up and check. Or scroll down
for the solution...
Our brains are trained to overlook the word OF.
If you saw all 6 Fs right away, you're a genius.
Most people see only 3 Fs. Some people see 4.