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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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    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 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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    PhET
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    In this online activity, learners will brush up on their multiplication, division, and factoring skills with this exciting game. This activity includes an online simulation, sample learning goals,...

    free Ages 8 - adult 10 to 30 minutes
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    PhET
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    In this online activity, learners build their own system of heavenly bodies and watch the gravitational ballet. With this orbit simulator, learners can set initial positions, velocities, and masses...

    free Ages 11 - adult 10 to 30 minutes
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    PhET
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    In this online activity, learners will explore size estimation in one, two and three dimensions. Multiple levels of difficulty allow for progressive skill improvement. This activity includes an...

    free Ages 6 - adult 10 to 30 minutes
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    The Exploratorium
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    In this activity, learners build bridges using paper and explore how much weight each bridge design can support. There is an element of surprise, which increases learners' interest in the...

    1 cent - $1 per group Ages 4 - 11 45 to 60 minutes
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    The Exploratorium
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    In this activity, learners make bridges using an oil-based modeling clay (plasticene). The instructions include discussion questions for both before and after bridge building. Key learning ideas...

    $1 - $5 per group Ages 4 - 11 30 to 45 minutes
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    Computer Science Unplugged
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    This activity shows learners how computers use numbers to represent pictures. A grid is used to represent the pixels (short for picture elements) of a computer screen. Numbers indicate whether...

    1 cent - $1 per student Ages 6 - adult 30 to 45 minutes
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    Computer Science Unplugged
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    This magic trick is based on how computers detect and correct data errors. In the trick, a volunteer lays out a 5 x 5 square of identical cards colored on one side, with a random mix of sides...

    1 cent - $1 per group Ages 8 - adult 30 to 45 minutes

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