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4-6

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Part of SciGirls
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Kart Racing

Kart racers Allie and Paige like to beat the boys on the racetrack. In fact, they call their team "Beat the Boys!" They race on different tracks with different conditions, so they have to adjust their karts before each race. The gears are the main thing they change. Each gear has a different number of teeth and each gear changes the way it drives. So the question is: Which gear gives them the best performance?

http://pbskids.org/dragonflytv/

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