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In this optics activity, learners experiment with polarizers (small dark rectangles) to examine light intensity.

In this activity, learners overlap the three primary colors to see how all other colors are made.

In this activity, learners explore their eye pupils and how they change.

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

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

In this activity, learners explore a scale by comparing objects, which look similar but have different weights. Learners predict and then measure the weights of various objects using a scale.