Please read this sentence.
.
FINISHED FILES ARE THE RE-
SULT OF YEARS OF SCIENTIF-
IC STUDY COMBINED WITH
THE EXPERIENCE OF YEARS.
Count the F’s.
How many did you find?
To see the answer, scroll down the page until it appears.
Most people, myself included, only see 3 Fs at first. That’s why it’s an interesting puzzle. It teaches us about our ability to see what’s right before our eyes. Don’t feel bad if you got it wrong; you have a lot of company.

I have seen this twice before and knew there were six, but only counted five. When I counted again, I saw I missed one of the of’s. I hope other people comment on their replies.
Wow, that is so weird. I looked at the puzzle carefully and only found three. Finally, with Linda’s helpful comment I was able to have the other “F”s reveal themselves.
Susy
I just looked at that puzzle for 5 minutes and could only find 3, I had to come to the comments to figure it out. I am going to blame it on speaking so much Spanish, haha. Keep up the good work.
this really freaked me out.