Not A Typical Post, But...

Read this sentence several times:

FINISHED FILES ARE THE RESULT
OF YEARS OF SCIENTIFIC STUDY
COMBINED WITH THE
EXPERIENCE OF YEARS.

Make sure you have read it several times before continuing.

Now count the number of F's in that sentence. Count them ONLY ONCE.
Do not go back and count them again. Then see below:
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There are six F's in the sentence. The majority of people only count three of them. Most people forget the Fs in the word OF. The human brain tends to see them as Vs instead of F's because of how they sound.

This test was in one of my textbooks. I only counted 3 and I thought it was insane and interesting so I thought I'd share the experience with you!