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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, learners investigate parallax, a method used to measure distances to stars and planets in the solar system.

In this activity (12th activity on the page), learners conduct an experiment to demonstrate how muscles are constantly feeding information to the brain about what they are doing.

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 calculate the width (horizontal diameter) of the blind spot on their retina. Learners make a blind spot tester using a piece of notebook paper.

In this activity (9th activity on the page), learners work in pairs to see how their perception of touch differs from reality.

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.

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

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 and game, learners will train to improve balance and spatial awareness by performing throwing and catching techniques on one foot.

In this activity about flight, learners explore how high they can jump. Learners dip their finger in ink or dirt, then jump as high as they can and mark paper attached to the wall.

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.