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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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    New York Hall of Science
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    Create 3D glasses and use them to explore color, light and optics. Fool your brain into 'seeing' three dimensions on a flat surface!

    1 cent - $1 per student Ages 6 - 18 10 to 30 minutes
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    Oregon Museum of Science and Industry
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    Learners analyze mixtures of dyes using filter paper chromatography. They place spots of the different dyes at the bottom of a piece of filter paper, and hang the paper to touch the surface of...

    $1 - $5 per group Ages 8 - adult Under 5 minutes
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    Aquarium of the Pacific
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    In this activity, learners interact with whale artifacts such as replicas of skulls, bones, teeth, and baleen (hair-like plates that form a feeding filter). Guiding questions help learners...

    Over $20 per group Ages 4 - adult 10 to 30 minutes
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    IEEE
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    In this activity, learners explore how engineering has developed various means to remove impurities from water. Learners work in teams of "engineers" to design and build their own "...

    $10 - $20 per group Ages 8 - 18 1 to 2 hours
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    Integrated Teaching and Learning Program, College of Engineering, University of Colorado at Boulder
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    Learners observe and discuss a vacuum cleaner as a model of a baghouse, a device used in cleaning industrial air pollution. In this demonstration, learners observe the inside of a used vacuum...

    $1 - $5 per group Ages 8 - 14 10 to 30 minutes
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    Mount Holyoke College
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    In this four-part activity, learners explore light and sound through a variety of hands-on investigations. First, learners explore sound waves and observe how sound can travel through other...

    $5 - $10 per group Ages 8 - 14 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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    The Exploratorium
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    In this activity, learners use gelatin as a lens to investigate the properties of laser light. Learners can view total internal reflection of a beam of light and investigate angles of reflection...

    $5 - $10 per student Ages 8 - 18 5 to 10 minutes
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    Integrated Teaching and Learning Program, College of Engineering, University of Colorado at Boulder
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    Learners take on the role of environmental engineers as they design water filters. Learners see how polluted water (water with chocolate powder mix) can become clearer when passed through their...

    $5 - $10 per group Ages 11 - 14 45 to 60 minutes

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