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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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    New York Hall of Science
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    In this fun hands-on activity, learners create a safety device to protect an egg "passenger" in a toy car crash. Learners experiment with different solutions to this very problem....

    $1 - $5 per student Ages 6 - 11 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