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Screaming Balloon
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  In this quick activity (page 1 of the PDF under SciGirls Activity: Extreme Sounds) about sound vibrations, learners will investigate which small objects, such as coins, hex nuts, or marbles, produce t
  
Tune Booster
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  In this activity, learners build unique sound enhancing inventions with items from around the house to amplify sound from their smart phone's speakers.