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Why Are Two Eyes Better Than One?
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In this activity, learners explore how their depth perception would be affected if they only had one eye. Learners work in pairs and attempt to drop a penny in a cup with one eye covered.

Seeing in the Dark
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In this activity (17th on the page), learners investigate why you cannot see colors in dim light.

Afterimage
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In this optics activity, learners investigate afterimages.