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    Twin Cities Public Television
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    In this engineering activity, learners explore simple machines and then build cardboard automata using cams. Learners are also challenged to build a complex machine--a moving sculpture that tells a...

    $5 - $10 per group Ages 8 - 14 2 to 4 hours
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    IEEE
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    In this activity, learners review the history of gumball machines and explore potential and kinetic energy, while working in teams to build a gumball slide. Teams then design and build their own...

    Over $20 per group Ages 8 - 18 2 to 4 hours