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In this activity (on pages 29-35), learners examine water pollution and filtration.

$1 - $5 per group Ages 8 - 14 45 to 60 minutes
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In this activity, learners construct bug models that "jitter" all over the table with just a battery, motor, and counterweight.

$5 - $10 per student Ages 8 - 14 30 to 45 minutes