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    The Exploratorium
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    In this activity, learners build bridges out of newspaper and tape to explore how structures are designed to bear loads. Learners adjust and modify their designs to accommodate a certain amount of...

    1 cent - $1 per group Ages 4 - 11 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