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    The Exploratorium
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    In this activity, learners build large-scale structures and cantilevers in a series of "building out" challenges with garden poles and tape. In doing so, learners will experience many of...

    $10 - $20 per group Ages 6 - 14 2 to 4 hours
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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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