This week Eli was learning about Newton's law (I do not remember that until middle school at the earliest...) and they had to make a balloon powered car incorporating Newton's law. Daddy worked late this week so it ended up being something that mommy helped with. I told him to look around and see what he wanted to use for wheels and cut out some sort of shape from the cardboard and this is what we ended up with. He was pleased with it especially after his went the farthest at school. Kiley loved watching it race across the floor too.