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Homemade Hovercraft!

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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

Percentage of Oxygen in the Air

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In this activity, learners calculate the percentage of oxygen in the atmosphere by using steel wool's ability to rust.
1 cent - $1 per student Ages 11 - 18 1 to 7 days