Cardboard Catapult. If you have some cardboard around you, don't turn them into the trash. Here is a good idea for you to change them into a great toy with other materials like, a sturdy box, thick strong rubber band, a pencil, toothpicks and a matchbox, or a small shallow box. Learn how to do it.
This simple catapult will provide you with entertainment. You can launch it with your foot. It works great for launching small items. Learn how to do it here. http://hative.com/catapult-projects-for-kids/