James Hoskin's

Read the following sentence once:

FINISHED FILES ARE THE RE- SULT OF YEARS OF SCIENTIF- IC STUDY COMBINED WITH THE EXPERIENCE OF YEARS.

Now go back and count aloud the number of F's in that sentence (only count them once), then click the button depending on how many you counted:

There are actually six F's in the sentence.

• If you saw one or two, you need glasses.
• People of average intelligence find three.
• 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.
• Any more than six, means you must have double vision.

There is no catch, most people miss the three OF's.