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This activity (8th activity on the page) tests learners' ability to identify things using only the sense of hearing.

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

This activity is designed to let learners measure their reaction time or response time to something they see.

In this activity, learners make a Benham Top to explore visual illusions and optics.

In this activity, learners investigate visual perception as well as plan and conduct their own experiments.

In this activity, learners investigate the sense of hearing and plan and conduct their own experiments.