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    American Museum of Natural History
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    In this activity, pairs of learners will create two make-believe dig sites by burying chicken bones in plaster of Paris--a powder that hardens when wet. Then, learners try to excavate (dig out)...

    $5 - $10 per group Ages 8 - 14 2 to 4 hours
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    American Chemical Society
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    In this activity on page 7 of the PDF, learners experiment with the interesting designs that can be made by painting on plaster. Learners discover the chemistry behind fresco, an art technique made...

    $10 - $20 per student Ages 6 - 14 10 to 30 minutes

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