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

In this activity, learners investigate how some butterfly wings get their color.

In this optics activity, learners build a spy tool to secretly view things over walls or around corners.

In this activity on page 13 of the PDF, use a special plastic card that has been painted with a chemical that changes color when it is in UV light.

This fun activity uses simple materials such as milk cartons and mirrors to introduce the ideas of optics and visual perception.