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        Roller Coaster | DragonFly TV: Solve a Science Mystery

        There's nothing like the thrill of a roller coaster ride. There's the long slow ride up to the top of the launch hill, the anticipation and then off you go through twists, turns, loops and hills. Gravity does all the work so your car coasts the whole way. Now here's a riddle: How do you launch a roller coaster without a launch hill?

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