Water Rocket: The combination of water, compressed air, and a plastic soda bottle serves as a great source of propulsion for a water rocket. Alternate way (without tape) to fix up those water bottle rockets. by elsa
Marshmallow Catapult: I thought this would be a fun and great idea for students to make in class. The project of the marshmallow catapult incorporates both art and science.when you can't buy them all a marshmallow gun!