NOW here's a funny thing from Dave Townend - and a quick way to discover whether you are a genius. Count every “f” in the following text:

“Finished files are the result of years of scientific study combined with the experience of years.”

How many fs did you spot? Three is normal, four is quite rare. But there are actually six. The reasoning behind the it, is that the brain does not process “of” and three of the fs are in the word of.

“Anyone who counts all six fs at the first go is a genius,” says Dave.

I got three.