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As a model of acid rain, learners water plants with three different solutions: water only, vinegar only, vinegar-water mixture.

$10 - $20 per group Ages 8 - 14 1 to 4 weeks
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Learners build devices from rubber bands to test for invisible air pollutants.

$1 - $5 per group Ages 8 - 14 45 to 60 minutes