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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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    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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