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In this activity, learners use two different techniques to estimate how many little things fit into one bigger thing.

In this activity about the brain and sleep (on page 138 of the PDF), learners measure their resting breathing rates. Learners will discover that breathing frequencies vary amongst individuals.

In this activity, learners will explore how the human brain interprets environmental stimuli.

In this activity, learners play a series of simple games to investigate navigation without visual and sound cues.

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

In this activity (on page 142 of the PDF), learners will compare breathing rates before and after hyperventilation to explore how reduced carbon dioxide levels in the blood lower the need to breathe.