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Can gelatin (like Jell-O ®) change the speed of light?

$5 - $10 per group Ages 14 - 18 1 to 2 hours
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In this activity, learners use tsunami time travel maps to predict how long it will take a tsunami to reach the shore.

free Ages 14 - adult 1 to 2 hours
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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