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    Twin Cities Public Television
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    In this environmental engineering activity, learners build windmills using everyday items. The first challenge is to build windmills that spin when placed in front of a fan. The second challenge is...

    $10 - $20 per group Ages 8 - 14 2 to 4 hours
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    WGBH
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    In this design challenge activity, learners add a jet-propulsion system (i.e. a balloon) to a blimp so it flies straight and far under its own power. This lesson guide includes links to video clips...

    $5 - $10 per group Ages 8 - 14 45 to 60 minutes
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    Center for Engineering Educational Outreach, Tufts University
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    Learners work with plastic sheeting, masking tape, and string to design the perfect material for plastic chair webbing, and then construct their webbing. Since the best webbing would resist...

    $10 - $20 per group Ages 11 - 14 1 to 2 hours
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    Make
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    In this activity, learners build a miniature wind tunnel to measure force. Learners construct the model out of Lexan plastic, a fan, and a precise digital scale. When wind pushes against a model...

    Over $20 per group Ages 11 - adult 2 to 4 hours
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    Chicago Children's Museum
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    In this activity, learners use cardboard bases and track tubes to make a ball run to explore the properties of mass, force, and motion. Learners test their ball runs using balls of various sizes,...

    $10 - $20 per group Ages 4 - 6 10 to 30 minutes