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    American Physical Society
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    In this simple demonstration, learners investigate the properties of air pressure. Learners place an index card on top of a glass full of water, then invert the glass. The surface tension of the...

    free Ages 8 - 14 5 to 10 minutes
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    WGBH
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    In this activity, challenge learners to predict and investigate how many water drops they can fit on one penny. Learners conduct the test three times to find the average number of drops they can...

    free Ages 6 - 11 10 to 30 minutes