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In this version of tag, a large group of learners model how the body fights infection. Learners act as germs, as lymphocytes, and as the body's cells threatened by germs.

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

A group of learners simulates the spread of disease by trading slips of paper, one set of which has been treated with a baking soda solution.