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    NASA
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    In this activity (on pages 19-21 of the PDF) learners observe mold growing on potatoes. Preparation for this activity has to start a week before, to allow time for the mold to grow on the potatoes....

    1 cent - $1 per group Ages 4 - 14 30 to 45 minutes
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    WGBH
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    Learners explore soybeans, soak them in water to remove their coat, and then split them open to look inside. They also make a musical shaker out of paper cups, a cardboard tube, and soybeans. This...

    1 cent - $1 per student Ages 4 - 11 45 to 60 minutes