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In this activity, learners create a soil and water model of a single-cell life environment and study living microorganisms.

$5 - $10 per group Ages 8 - 18 1 to 7 days
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In this activity (page 4), learners work in groups to plan and build large structures using recyclable materials they have brought from home.

$1 - $5 per group Ages 6 - 14 30 to 45 minutes