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        4-6

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        Part of DragonflyTV
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        Ice Bike

        Bob and Brennan are into a very cool, very slick sport: ice biking! Their school holds an annual ice bike race, and the goal is to design and build the winning bike. They want to modify one of last year's top models by adding studs to the tires. The studs will add traction, kind of like cleats do on shoes. Their DragonflyTV question is: How many studs should we add for maximum speed on ice?

        http://pbskids.org/dragonflytv/

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