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    American Museum of Natural History
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    In this experiment, pairs of learners explore how cold water affects circulation. The mammalian diving reflex (MDR) slows circulation when the body is exposed to cold water. Learners measure their...

    free Ages 8 - 18 30 to 45 minutes
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    Twin Cities Public Television
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    This outdoor activity (on page 2 of the PDF under SciGirls Activity: Sand Dunes) is a full inquiry investigation into how the amount of moisture in a sand dune relates to the number of plants...

    $10 - $20 per group Ages 8 - 14 2 to 4 hours