I now know what clouds are. I know what a ruler is. A ruler is twelve inches. If you sawed a ruler into inches there would only be twelve pieces. You could saw some of these pieces into smaller pieces and have more pieces, but there would still only be twelve inches in a ruler no matter how many pieces you sawed it into.
Some rulers are bigger than others but they are all marked off in inches.
If you didn't have rulers, you couldn't measure anything, and then you would never know how big anything was. You do learn a lot in school. One of the important things you learn is that the things you knew before were not right. That's how the school decides when you have learned enough, and they send cards home to your parents that tell them how many times you were right and whether you were right more than other kids your age and whether you need improvement in being right. There is one kid in my class who isn't right very much, and my teacher gets upset about it and his parents worry all the time.