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In this activity (14th activity on the page) about the sense of touch, learners examine if it is easier or harder to identify an object if they move their hands over it.

In this activity (11th activity on the page), learners use pennies to test their hearing acuity.

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

In this activity (3rd on the page), learners investigate circadian rhythms by examining how well people do with estimating time.

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.

This is an activity (located on page 131 of the PDF) related to sleep and circadian rhythms as well as space travel.