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Perfect Pearl, The
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Viewing Ideas
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Before Watching
Collect some bivalve shells, such as oysters, clams, or mussels, and a fake
pearl. Using hand lenses, have students investigate the nacre, or
mother-of-pearl lining, from which pearls are made. Compare the colors of the
nacre inside different shells. Compare the nacre to fake pearls. How does it
differ? Put a bit of vinegar on both the nacre and the fake pearl. What
happens? (The nacre, which is calcium carbonate, will bubble. The fake pearl
will have no reaction to the vinegar.)
After Watching
Have students identify the ways in which science, technology, and society intersected in this program.
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