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    The Exploratorium
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    This activity shows you how to make a mold terrarium using a jar and leftover food. Learners explore mold, an "icky but necessary" thing that helps living matter rot, return to the soil,...

    1 cent - $1 per group Ages 8 - 14 1 to 4 weeks
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    Oregon Museum of Science and Industry
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    In this activity (on pages 19-24 of PDF), learners soak chicken bones or eggshells in vinegar for several days. Learners observe what happens to the material as the acid dissolves the calcium that...

    1 cent - $1 per student Ages 8 - 14 1 to 4 weeks

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