Kid's Life Hack - Phone speakers (think practical engineering for kids!)

My oldest found this idea on youtube and it works! For more info, watch below (it's the first hack). The third hack works well too - it's kid tested!

Good questions to ask kids:

* Why does this work?

* Does the material type matter?

* Does the size of the cup/toilet roll matter?

* Do you have suggestions to improve this design?


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