Read the following ONCE and count the number of 'F' in the text: FINISHED FILES ARE THE RE- SULT OF YEARS OF SCIENTIF- IC STUDY COMBINED WITH THE EXPERIENCE OF YEARS Managed it? Scroll down only after you have counted them! OK? How many? Three? Wrong, there are six - no joke! Read again! The reasoning is further down... The brain cannot process “OF“. Incredible or what? Anyone who counts all six 'F' on the first go is a genius - three is normal,four quite rare.