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Globe at Night
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In this international citizen science activity, learners measure their night sky brightness and submit their observations into an online database.

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

Seedy Travelers
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In this activity (on pages 18-28), learners explore how the shape of seeds affects how they are dispersed by wind, birds, ocean currents and other means.

Cool Tool
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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.