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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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    The Exploratorium
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    In this activity, learners construct a device out of a piezoelectric igniter, like those used as barbecue lighters. Learners use the device to remotely start current flowing in a simple series...

    $5 - $10 per student Ages 11 - 18 30 to 45 minutes
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    Lawrence Hall of Science
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    This activity has learners interacting with live crayfish, but could be adapted for a variety of similar hardy and interesting organisms. Instructions are provided for facilitating free and guided...

    Over $20 per group Ages 4 - adult 10 to 30 minutes