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This activity (on page 2 of the PDF under SciGirls Activity: Extreme Sounds) is a full inquiry investigation into sound.

Over $20 per group Ages 8 - 14 2 to 4 hours
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This activity (9th activity on the page) about hearing demonstrates to learners the importance of having two ears.

1 cent - $1 per group Ages 6 - 18 5 to 10 minutes