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    COSI
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    In this ecology activity (page 8 of the PDF), learners explore how to filter contaminated water using a variety of materials. They discover that the water they drink goes through a long process to...

    $10 - $20 per group Ages 11 - 14 45 to 60 minutes
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    Oregon Museum of Science and Industry
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    Using household materials, learners can make white gooey globs from clear solutions. Alum, dissolved in water, reacts with the hydroxide in ammonia to create aluminum hydroxide. This creates a soft...

    1 cent - $1 per student Ages 8 - 14 5 to 10 minutes
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    Lawrence Hall of Science
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    In this outdoor activity, learners make their own organic-rich soil. Depending on where this activity is done, learners will probably discover that their local soil is low in organic matter. Then...

    $10 - $20 per group Ages 8 - 18 45 to 60 minutes
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    University of Nebraska State Museum
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    In this two-day activity (on pages 16-22), learners use a process like that of the Yoruba people of Nigeria to create an African symbol on cloth. Learners first make cassava gel, then paint...

    $10 - $20 per group Ages 8 - 14 1 to 7 days
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    Biotechnology and Biological Sciences Research Council
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    In this activity (p.23 of PDF), learners dye wool with fungi. Learners discover that natural chemicals in fungi can dye wool different colors. Note: Natural dyeing normally requires a color...

    $10 - $20 per group Ages 11 - 14 2 to 4 hours
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    The Exploratorium
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    In this activity, learners stain fabrics--on purpose! Learners explore the art of natural dyeing by using dyes and substrates that are both derived from plant or animal sources as well as mordant...

    Over $20 per group Ages 11 - 18 1 to 2 hours
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    New Jersey Department of Education
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    Water treatment on a large scale enables the supply of clean drinking water to communities. In this activity, learners develop methods to clean a polluted water sample, describe components of a...

    $5 - $10 per group Ages 11 - adult 45 to 60 minutes
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    Twin Cities Public Television
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    In this technology activity, learners light up the room with electrifying play dough creations. Learners use conductive and insulating homemade play dough to build simple circuits. Learners then...

    Over $20 per group Ages 8 - 14 1 to 2 hours
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    University of Nebraska State Museum
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    In this activity (on pages 30-36), learners simulate a dig for ancient pollen, to experience how paleobotanists study fossilized pollen in rocks to learn about early geological and climatological...

    $10 - $20 per group Ages 8 - 14 1 to 2 hours