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    COSI
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    In this activity (page 6 of the PDF), learners will observe both a chemical and a physical change. By experimenting with plaster of paris, students will differentiate between these types of changes...

    Over $20 per group Ages 8 - 18 4 to 24 hours
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    COSI
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    In this activity (page 3 of the PDF), learners will observe a physical change. They will be astounded to find out that pens and markers of a seemingly single color can actually be made of multiple...

    $1 - $5 per group Ages 6 - 14 10 to 30 minutes

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