When you put all the five year olds on earth in one room, every one of you would be able to compare two blocks, a rod and a ball. Depending on how you were thought you either pass the rod along or the ball. Then some very smart people came up with special ways to do very hard maths using those blocks.

Now, in the olden days they kept the way they thought those kids a secret. But we knew what the results were, so we could all do much harder math then we could do in our heads. So while the other adults knew how to pack you all closer together and needed new ways to do even harder math, there was a group of good people who didn't really like all the secrecy and thought that they were doing it way to complicated but couldn't do anything about it.

Like it always is, years went by and the world changed, they kept making up new rules on how the blocks should be passed around so it became slower. Those good people then decided we should be simplifying, to make it faster yet again! "And no more secrecy!" - They said. "So everyone can build their own mini five year old sweat shops and it would cost significantly less then it does now!"