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    American Chemical Society
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    In this activity on page 9 of the PDF, learners test how flavoring extracts move through the walls of a balloon. Learners discover that the extracts' motion is similar to the way that oxygen...

    $5 - $10 per student Ages 8 - 14 10 to 30 minutes
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    Science Friday
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    In this activity, learners conduct a series of hands-on experiments that demonstrate how the working of plants' veins, known as capillary action, enables water to travel throughout the length...

    $5 - $10 per student Ages 11 - 14 1 to 7 days
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    The Exploratorium
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    In this quick optics activity, learners use a dim point of light (a disassembled Mini MagLite and dowel set-up) to cast a shadow of the blood supply in their retina onto the retina itself. This...

    $1 - $5 per student Ages 8 - 14 Under 5 minutes