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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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    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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    Computer Science Unplugged
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    In this activity about computer programming, learners follow instructions in a variety of ways in order to successfully draw figures. Through these exercises, learners will experience some of the...

    1 cent - $1 per group Ages 6 - 18 45 to 60 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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    The Exploratorium
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    In this activity, learners build bridges using paper and explore how much weight each bridge design can support. There is an element of surprise, which increases learners' interest in the...

    1 cent - $1 per group Ages 4 - 11 45 to 60 minutes
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    Computer Science Unplugged
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    This activity shows learners how computers use numbers to represent pictures. A grid is used to represent the pixels (short for picture elements) of a computer screen. Numbers indicate whether...

    1 cent - $1 per student Ages 6 - adult 30 to 45 minutes