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In this optics activity, learners explore why the sky is blue and the sunset is red, using a simple setup comprising a transparent plastic box, water, and powdered milk.

$1 - $5 per group Ages 8 - 14 30 to 45 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