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In this activity (on pages 26-33), learners play parasitologists, solving several "mysteries" about people who got sick from various parasites. In teams of four, each member solves one mystery.

1 cent - $1 per student Ages 8 - 14 45 to 60 minutes
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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.

$1 - $5 per group Ages 4 - 8 10 to 30 minutes
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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.

$1 - $5 per group Ages 8 - 14 45 to 60 minutes