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Bend It, Break It
Source Institutions
In this activity (on pages 25-32 of PDF), learners make models of the inner ear out of pipe cleaners.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-001-416.gif?itok=uNvIrPFs)
Build a Band
Source Institutions
In this design challenge activity, learners build a four-stringed instrument that can play a tune.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-000-732.jpg?itok=zz-17kJq)
Good Vibrations
Source Institutions
This lesson (on pages 15-24 of PDF) explores how sound is caused by vibrating objects. It explains that we hear by feeling vibrations passing through the air.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-001-911.gif?itok=AK2t3Qk_)
Headphone Helper
Source Institutions
In this design challenge activity, learners add headphones to a previously built instrument (see "Build a Band" activity) to make it easier to hear.