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

In this activity, learners construct hand-held altitude trackers. The device is a sighting tube with a marked water level that permits measurement of the inclination of the tube.

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 test the rate of ripening fruit and vegetables and use a chemical to inhibit the ripening process.