Give this a shot. If it takes you more than 20 minutes, you are trying too hard (or you're unconscious).
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LOCKHEED SECURITY CLASSIFICATION:
SUBJECT: Test!
READ this sentence:
SULT OF YEARS OF SCIENTIF-
IC STUDY COMBINED WITH
THE EXPERIENCE OF YEARS.
Now count aloud the F's in that sentence. Count them ONLY ONCE; do not go back and count them again. See below...
ANSWER:
There are six F's in the sentence. One of average intelligence finds
three of them. If you spotted four, you're above average. If you
got
five, you can turn your nose at most anybody. If you caught six,
you
are a genius. There is no catch. Many people forget the OFs. The
human brain tends to see them as "V's" instead of "F's".