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Pressure (Plastic Bottle Rocket) | Simple Machines (Levers)
Solids, Liquids & Gasses (Cornstarch Mud, Giant Rock Candy) | Air and Flight (Giant Paper Airplane)
Balance (Tightrope, Gyroscopic Stabilization Backpack) | Inertia (Drag Racer)
Earthquakes! (Earthquake-Proof Structures)