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    Twin Cities Public Television
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    In this quick activity (located on page 2 of the PDF), learners will model how wetlands act as natural filters for the environment. Learners prepare a mixture of water, soil, gravel, and leaves and...

    $5 - $10 per group Ages 8 - 14 10 to 30 minutes
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    PBS
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    In this "Sid the Science Kid" activity, learners get their hands dirty by playing in a container of soil. Then they compare the effectiveness of cleaning their hands with just a paper...

    1 cent - $1 per group Ages 4 - 6 10 to 30 minutes
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    Oregon Museum of Science and Industry
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    Learners build a filter from old soda bottles and dirt. They create polluted water, and pour it through their filter to clean it. Leaners discover earth materials such as sand and dirt can be used...

    $1 - $5 per group Ages 11 - 18 30 to 45 minutes
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    Oregon Museum of Science and Industry
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    In this activity (on page 2 of PDF), learners mix oil and water. Then, they add soap and observe what changes! The activity demonstrates how oil and water don't mix, except when soap is added....

    1 cent - $1 per student Ages 4 - 11 Under 5 minutes
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    National Health Museum
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    In this lab (Activity #1 on page), learners compare bacteria growth on two petri dishes containing nutrient agar: one that has been touched by a finger washed only with water and one that has been...

    $1 - $5 per group Ages 8 - 18 1 to 7 days
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    National Health Museum
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    In this lab (Activity #2 on page), learners compare bacteria growth on two petri dishes containing nutrient agar. Learners touch the doors, faucets, etc. in bathroom and then immerse their hands in...

    $1 - $5 per group Ages 8 - 18 1 to 7 days