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    IEEE
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    In this activity, learners explore how watermills have helped harness energy from water through the ages. Learners work in teams of "engineers" to design and build their own watermill out...

    $10 - $20 per group Ages 8 - 18 1 to 2 hours
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    Twin Cities Public Television
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    In this engineering activity, learners examine bicycle mechanics and gear ratios. Learners determine which gears will help them bike a set course in the shortest amount of time.

    1 cent - $1 per group Ages 8 - 14 1 to 2 hours
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    National Geographic Society
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    In this activity, learners experiment with gear motion to understand how gears work to change the amount of force, speed, or direction of motion in machines. Learners discover that gears allow for...

    $10 - $20 per group Ages 8 - 14 30 to 45 minutes