Boost their learning trajectory with an authentic catapult! Kids can build their own with planks, a little glue and the help of easy, step-by-step instructions. What shoots farther, a marshmallow or a piece of macaroni? How does the object's course change when you pull the arm back to different points? If you make the flight deck higher, how does it affect the hurl? Includes pre-drilled planks, wood glue, leather strap, ruler, rubber bands, cup, 2 balls, target mat, fasteners and instructions.