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In this optics activity, learners explore color by examining color dots through colored water and the light of a flashlight.

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

Learners explore their surroundings while reasoning about categories and counting.

In this activity about bones (page 12 of PDF), learners investigate and compare the weight-bearing capacity of solid and hollow cylinders.

In this activity, learners explore how light and dark colored objects absorb the Sun's radiations at different rates.