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Learners investigate the concept of humidity by using a dry and wet sponge as a model. They determine a model for 100% humidity, a sponge saturated with water.

1 cent - $1 per group Ages 8 - 14 30 to 45 minutes
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Learners make their own paper. They start by shredding old newspaper, clean toilet paper, and clean paper towels.

$1 - $5 per student Ages 8 - 11 30 to 45 minutes