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In this activity, learners repeat patterns in two and three dimensions to create tessellations.

$1 - $5 per group Ages 8 - 11 1 to 2 hours
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In this design and physics challenge, learners construct a cylindrical wing, fly it, make modifications, and determine how the changes affect flight patterns.

1 cent - $1 per student Ages 8 - 18 45 to 60 minutes
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Spin a short piece of PVC pipe that's been marked up, and watch a triangle appear. Enjoy this optical illusion from the Exploratorium's Science Snack series.

free Ages 4 - 18 5 to 10 minutes
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In this group activity, learners make multi-sided polygons with string.

1 cent - $1 per group Ages 8 - 11 30 to 45 minutes