Try it.

Count every " F " in the following text:

FINISHED FILES ARE THE RE
SULT OF YEARS OF SCIENTI
FIC STUDY COMBINED WITH
THE EXPERIENCE OF YEARS...

(See next tweet in this thread)

How many?

3....4....?

Wrong. Answer is 6.

Go back to 1st tweet and try to find the 6 F& #39;s before you move to next tweet in this thread.

The brain cannot process "OF".
Go back and look again!
Anyone who counts all 6 "F& #39;s" on the first go is a genius.