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What happens when two wave pulses meet in the middle? Send waves down a spring to watch them travel and interact.

1 cent - $1 per student Ages 4 - 18 Under 5 minutes
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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.

$1 - $5 per group Ages 4 - 18 10 to 30 minutes