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This activity (on page 2 of the PDF under SciGirls Activity: Hovercraft) is a full inquiry investigation into hovercraft engineering and design optimization.

Over $20 per group Ages 8 - 14 1 to 7 days
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Using simple, inexpensive items, learners build and test submarine models.

$10 - $20 per group Ages 11 - 18 45 to 60 minutes