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In this activity, learners explore how nanosized structures can create brilliant color.

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

In this activity, learners use earthworms as "unknown creatures" from the South American jungle to find out how animals use senses.

In this geography investigation, learners use a nighttime satellite image to observe areas of light across the United States and to identify patterns and spatial distributions of human settlements.

In this sunny day experiment, learners measure and compare how quickly light and dark colored materials absorb heat.