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    WGBH
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    In this physics activity, challenge learners to lift a book with just air using a plastic bag and a straw. This activity demonstrates compressed air and forces.

    1 cent - $1 per student Ages 6 - 11 Under 5 minutes
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    The Exploratorium
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    What happens when two wave pulses meet in the middle? Send waves down a spring to watch them travel and interact. This activity, developed by the Exploratorium, uses an old fashioned phone cord and...

    1 cent - $1 per student Ages 4 - 18 Under 5 minutes