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    COSI
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    In this health activity (page 7 of the PDF), learners will discover the importance of handwashing as a factor in reducing the spread of pathogens. Using a sponge (or sponge-like ball) and flour,...

    $1 - $5 per group Ages 4 - 11 5 to 10 minutes
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    American Association for the Advancement of Science
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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. After playing one...

    $1 - $5 per group Ages 8 - 11 30 to 45 minutes
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    Oregon Museum of Science and Industry
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    In this activity, learners grow germs collected from their hands and other objects. They cultivate the germs on a growth medium (such as slices of grapefruit or processed cheese) for a week....

    1 cent - $1 per student Ages 6 - 14 1 to 7 days