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Millions of organisms can live in and around a body of water.

In this math lesson (page 2 of the PDF), learners use bottles of various shapes to explore the abstract concept of rate of change.

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.

This fun and simple hands-on astronomy activity lets learners build a scale model of the universe with little more than adding machine tape.

Learners construct and launch paper helicopters.

In this activity, learners investigate how geometry plays a role in perspective.

In this lab activity, learners explore how to initiate a density current. Learners measure six flasks with different concentrations of salt and water (colored blue).