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In this activity about light and refraction, learners discover how a lens creates an image that hangs in midair.

$5 - $10 per student Ages 8 - 14 30 to 45 minutes
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In this activity, learners discover that it's difficult to distinguish between two different shades of gray when they aren't separated by a boundary.

$1 - $5 per group Ages 8 - 14 5 to 10 minutes