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    American Chemical Society
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    In this activity on page 15 of the PDF, learners measure the amount of bubbles that they make using a detergent. Learners investigate whether adding Epsom salt to the solution affects its "...

    $1 - $5 per student Ages 8 - 14 30 to 45 minutes
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    Lawrence Hall of Science
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    In this earth science/math/art activity, learners use simple ingredients to grow crystals and examine the repeating geometric shapes and patterns. Learners compare the growth of crystals from four...

    $5 - $10 per group Ages 6 - 14 1 to 4 weeks