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Marble Run!
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This activity (on page 2 of the PDF under SciGirls Activity: Luge) is a full inquiry-based challenge related to motion and design optimization.
Roller Coasters
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In this activity learners will build roller coasters and test them using small balls or marbles.
Tracking Otters
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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.
Build Your Own Marble Machine
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In this activity, learners will build a ball run contraption.