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In this activity related to indoor air pollution, learners build take-home dust catchers with wax paper and petroleum jelly.

$5 - $10 per group Ages 8 - 14 1 to 2 hours
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In this activity learners observe mold growth on different types of bread by measuring and recording the growth rate.

$5 - $10 per group Ages 8 - 14 1 to 4 weeks