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    The Exploratorium
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    Before there were clocks, people used shadows to tell time. In this outdoor activity, learners will discover how to tell time using only a compass, a pencil, a handy printout, and a sunny day....

    $5 - $10 per group Ages 8 - 14 10 to 30 minutes
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    American Association for the Advancement of Science
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    A group of learners models the Sun shining on the Earth. By rotating the Earth, they demonstrate how the Sun only shines on a portion of the Earth at a time. Learners understand why there are...

    free Ages 8 - 11 10 to 30 minutes
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    NSBRI
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    In this activity (on page 1 of the PDF), learners make a "mini-globe" to investigate the causes of day and night on our planet. This is an introductory activity in a guide related to the...

    $1 - $5 per group Ages 8 - 14 30 to 45 minutes