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These three short activities challenge groups to fit objects through paper and index cards: "Slots" presents the challenge for one learner to figure out which objects fit through a hole cut by another

1 cent - $1 per group Ages 4 - 14 10 to 30 minutes
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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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In this engineering activity, challenge learners to construct a paper bridge that can support 100 pennies.

1 cent - $1 per student Ages 6 - 11 10 to 30 minutes
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In this engineering activity, challenge learners to build a tower out of 10 sheets of newspaper and 3 feet of masking tape, which can hold a golf ball balancing at the top.

1 cent - $1 per group Ages 6 - 11 10 to 30 minutes