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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
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Make a one-string "guitar" by stringing a cup with some fishing line. You amplify the plucking of the string by placing a piezo contact microphone and mini battery powered amplifier inside the cup.

$5 - $10 per student Ages 6 - 18 1 to 2 hours