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In this activity, learners estimate risks associated with different events and compare their estimates to the real possibilities.

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 about how the body regulates blood pressure (page 117 of the PDF), learners make and compare measurements of heart rate and blood pressure from three body positions: sitting, standing

In this activity, learners investigate the olfactory system by conducting several experiments.

In this activity (26th on the page), learners construct an easy-to-build device and test motor learning.

In this activity (1st on the page), learners explore circadian rhythms by keeping track of their body temperature.

In this activity (18th on the page), learners conduct an experiment to examine memory.

In this activity (on page 134 of the PDF), learners explore reaction time.

In this activity (23rd on the page), learners conduct an experiment to examine memory and learning.

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

In this activity (on page 146 of the PDF), learners will explore the effects of increased carbon dioxide in the bloodstream.

In this activity (page 105 of the PDF), learners measure heart rate and blood pressure and learn how to obtain consistent measurements during repeated tests.

In this activity (page 26 of the PDF), learners make observations, formulate hypotheses and design a controlled experiment, based on the reaction of carbon dioxide with calcium hydroxide.

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.