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    Science Friday
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    In this activity, learners explore how an electromagnet works by making a simple one. Using this knowledge, learners design a diagram to make a working speaker using household materials. Then...

    $10 - $20 per group Ages 11 - 14 45 to 60 minutes
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    University of Nebraska State Museum
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    This activity (on pages 38-43) has learners simulate the way scientists track and map the movement of otters in the wild using radio trackers. One learner plays the role of Sea Otter, and other...

    $1 - $5 per group Ages 8 - 14 45 to 60 minutes
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    NOAA
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    In this activity, learners will listen to as many radio stations as possible to discover that AM radio signals can travel many hundreds of miles at night. Learners log the call signs, locations,...

    free Ages 8 - 18 1 to 2 hours