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    American Chemical Society
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    In this activity on page 10 of the PDF, learners develop an experiment to answer the following question: "How much water can the hydrogel in a baby diaper hold?" Use this activity to...

    $1 - $5 per student Ages 8 - 18 10 to 30 minutes
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    The Exploratorium
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    In this math activity, learners observe and sketch cracking patterns in pavement. Learners use a protractor to measure and label the angles of their sketches and conclude if some angles are more...

    1 cent - $1 per student Ages 11 - 18 10 to 30 minutes
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    PhET
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    In this online activity, learners adjust mountain snowfall and temperature to see how glaciers grow and shrink. They will use scientific tools to measure thickness, velocity and glacial budget....

    free Ages 8 - adult 10 to 30 minutes
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    National Optical Astronomy Observatory
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    In this international citizen science activity, learners measure their night sky brightness and submit their observations into an online database. This popular program has generated 100,000...

    free Ages 4 - adult 10 to 30 minutes
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    PhET
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    In this online activity, learners use a realistic mass and spring laboratory. They hang masses from springs and adjust the spring stiffness and damping. Learners can even slow time and transport...

    free Ages 8 - adult 10 to 30 minutes
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    PhET
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    In this online interactive simulation, learners will add different salts to water and then watch the salts dissolve and achieve a dynamic equilibrium with solid precipitate. Learners will also...

    free Ages 8 - adult 10 to 30 minutes
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    PhET
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    In this online interactive simulation, learners will test the pH of liquids like coffee, spit, and soap to determine whether each is acidic, basic, or neutral. Learners will visualize the relative...

    free Ages 11 - adult 10 to 30 minutes
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    NISE Network
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    This hands-on activity demonstrates how a material can act differently when it's nanometer-sized. Learners compare the reaction rate of an effervescent antacid tablet that is broken in half...

    $1 - $5 per group Ages 6 - adult Under 5 minutes
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    NISE Network
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    This is an activity in which learners will find that they can detect differences in concentration better with their nose (smelling) than with their eyes (seeing). Our sense of smell allows us to...

    $5 - $10 per group Ages 4 - adult 5 to 10 minutes
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    NISE Network
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    In this nanoscience activity, learners discover that it's easy to pour water out of a regular-sized cup, but not out of a miniature cup. They learn that size can affect the way materials like...

    $5 - $10 per group Ages 4 - adult 5 to 10 minutes

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