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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 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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    • Oregon Museum of Science and Industry (remove)
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