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With a bit of PVC, a laser, a can/cup, and a small mirror, you can make a device that visualizes you voice or any sound transmitted into the cup/can.

free Ages 8 - adult 10 to 30 minutes
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In this four-part activity, learners explore light and sound through a variety of hands-on investigations.

$5 - $10 per group Ages 8 - 14 1 to 2 hours