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In this activity (described on pages 39-42 of PDF), learners make a paper wheel (on pages 57-60 of PDF) that shows them the relative loudness of different sounds.

1 cent - $1 per student Ages 8 - 18 10 to 30 minutes
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In this activity (on pages 25-32 of PDF), learners make models of the inner ear out of pipe cleaners.

1 cent - $1 per student Ages 8 - 18 10 to 30 minutes