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

Eyepatch Challenge
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In this activity, learners construct an indoors obstacle course and discover how using an eye patch can help them complete the course in the dark.

Globe at Night
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In this international citizen science activity, learners measure their night sky brightness and submit their observations into an online database.