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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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In this engineering activity, learners explore simple machines and then build cardboard automata using cams.

$5 - $10 per group Ages 8 - 14 2 to 4 hours