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In this activity, learners investigate whether more people are squares or rectangles. People with similarly sized heights and arm spans are classified as squares.

free Ages 6 - 11 10 to 30 minutes
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Get a roll of pennies, throw them on the ground, then remove those that only show tails, and repeat with the ones left over.

free Ages 8 - 18 5 to 10 minutes
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In this activity, learners use a string and pair of scissors to find pi in the world all around them. Take the circumference of a round object with string and cut the string to that length.

1 cent - $1 per group Ages 11 - adult 5 to 10 minutes
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This three-part activity shows learners how to build three meteorology tools: a wind vane, a rain gauge, and a barometer.

$1 - $5 per student Ages 8 - 14 1 to 7 days
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This is a quick game about self-assembly (page 2 of PDF under Self-Assembly Activity). Like the molecules of DNA, learners will self-assemble into a pattern by following a simple set of rules.

free Ages 8 - 14 10 to 30 minutes