Spell Checking Activity

This has got to be one of the most interesting tests ever. It's very short so try it—you may be amazed. Don't cheat, because if you do the test would be no fun. There are no tricks to the test.

Read the following sentence:

FINISHED FILES ARE THE RE-
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 (that would be cheating.)