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In this activity, learners compare and contrast their own skin (including the area covered) with that of an orange.

Learners design their own experiment to investigate how pollution diffuses through ground material.

In this physical sciences activity, learners explore how passive solar design increases energy efficiency.

In this activity, learners build penetrometers to test leaf toughness. Biologists measure leaf toughness to study the feeding preferences of insects and bugs.

In this activity (on pages 10-17), learners discover how scientists study biodiversity and the health of the environment based on inspection of small areas—a process known as sampling.

In this activity, learners examine nanoscale structures of common things.