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Build ten sleek and updated models of catapults and crossbows. These classic siege weapons from the Middle Ages also happen to be great tools for teaching physics, including lessons in force, energy, motion, and projectiles. Experiment with 5 different types of crossbows safely - the projectile, called the bolt, has a safe foam tip and a special cross-section that prevents other projectiles from being launched. Can also build 5 different catapults that use mechanical rubber bands and counterweights to fling projectiles into the air. The 32-page, full-color manual has illustrated step-by-step instructions.
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