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In this activity, learners investigate color vision as well as plan and conduct their own experiments.

In this activity (6th on the page), learners investigate how photoreceptors in the eye (rods and cones) "adapt" to low light conditions.

In this activity (1st on the page), learners find their blind spot--the area on the retina without receptors that respond to light.

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

In this activity, learners will explore how their own eyes work by experimenting with their photoreceptors.