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How to Make Roller Coasters for a Science Fair Project | Sciencing
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Marbulous Structures! This term's focus is to build a roller coaster for a marble. We will be learning to design a marble roll
/cdn.vox-cdn.com/uploads/chorus_asset/file/15999574/RollercoasterTychoon.jpg "Time's a Flat Ferris Wheel: Enduring Legacy of 'RollerCoaster Tycoon' - The Ringer")