Tutorial on F Stops

OK folks, 

I know I am going to lose some of you on this one. 

I am going to write a four letter word:

"MATH."

I hate math.

But if you can watch this video 

and do NOT worry about the math - 

you'll learn a lot of valuable information about your camera. 

You do not need to understand the math to 

grasp the concept of f stops. 

But understanding f stops is key to improving your photography! 

This is the best tutorial I have ever seen on this topic. 

I never knew how the f numbers were derived before.