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This activity (on page 3 of the PDF) has learners create models of butterfly wings.

1 cent - $1 per student Ages 4 - 6 10 to 30 minutes
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This is an activity exploring color and color mixing.

$5 - $10 per group Ages 4 - 6 10 to 30 minutes
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Learners observe different light sources, outdoors and indoors, using prism glasses (diffraction glasses) and color filters.

$5 - $10 per student Ages 4 - 8 10 to 30 minutes
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This is an online exhibit about color perception. Learners set a random background color and then try to mix red, blue, and green light to match.

free Ages 6 - 18 5 to 10 minutes