Build three amazing self-powered machines—a motorized robot, race car, and countdown timer—all without batteries or electricity! The secret behind these fascinating models is the mainspring, a spiral-shaped spring that stores energy when wound up and then releases it to power motion. Watch as the robot marches forward, the race car zooms up to 45 feet, and the countdown timer ticks down for up to six minutes using a clever system of gears, ratchets, and linkages. As you assemble over 130 snap-together pieces, you’ll explore the physics behind potential and kinetic energy while learning how wind-up toys and mechanical clocks work. Step-by-step illustrated instructions make it easy to build and experiment! Why You'll Love This: 3-in-1 kit—build a robot, race car, and countdown timer No batteries or electricity needed—just wind them up and go! Learn about springs, gears, and mechanical energy through hands-on play Race car speeds up to 45 feet, robot walks 20 inches, and timer runs for 6 minutes Encourages STEM learning and engineering skills Perfect for budding engineers and curious minds!
