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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...

    Ages 6 - adult
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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...

    Ages 8 - adult
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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,...

    Ages 8 - adult
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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...

    Ages 8 - adult
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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...

    Ages 11 - adult
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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...

    Ages 11 - adult
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    Computer Science Unplugged
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    This activity introduces the idea that computer scientists measure information by how "surprising" a message is. Learners play the game "20 Questions" and use the number of...

    Ages 8 - 14
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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....

    Ages 8 - adult
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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...

    Ages 8 - adult