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These build-and-discover kits are designed to help kids learn the basics of classical mechanics in a playful way. Each set includes easy-to-follow, illustrated building instructions that explain the scientific principles behind each build, plus experimental activities for hands-on learning.Includes 2 kits:In Newton's Laws Engineering Kit, kids learn how to transform potential energy to kinetic energy with eight working models. Build a ballistic catapult, a balloon-powered plane, a dragster car and more! Includes 121 pieces.STEM Machines Engineering Kit builds 60 working models of working tools including levers, the wedge, the wheel and axle, the screw, the inclined plane and the pulley as well as more advanced gears and linkages. Includes 197 pieces.- These build-and-discover kits are designed to help kids learn the basics of classical mechanics in a playful way- Kits include all necessary pieces and instructions