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This activity investigates how bark beetles can threaten forests by having learners estimate the number of infected trees from a photo.

In this four-part activity, learners explore how the body works and the chemistry that happens inside living things.

Learners observe different light sources, outdoors and indoors, using prism glasses (diffraction glasses) and color filters.

In this four-part activity, learners explore light and sound through a variety of hands-on investigations.