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In this optics activity, learners explore diffraction by adding wax blocks to a ripple tank. The wedge-shaped blocks act as obstacles that the wave must bend around.

$1 - $5 per student Ages 14 - adult 5 to 10 minutes
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In this optics activity, learners explore interference by adding wax blocks to a ripple tank.

$1 - $5 per student Ages 14 - adult 5 to 10 minutes
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In this physics activity (page 4 of the PDF), learners will--using nothing more than a coat hanger and some string--explore and understand sound energy and how it moves.

$1 - $5 per student Ages 6 - 11 5 to 10 minutes