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In this engineering activity, challenge learners to invent a water filter that cleans dirty water.

$1 - $5 per student Ages 6 - 11 10 to 30 minutes
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In this activity, learners consider the water features they might enjoy at a community park--a pond, brook, water playground (or "sprayground"), or pool--and what happens to the water over time.

Over $20 per group Ages 4 - 14 10 to 30 minutes