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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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    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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    Science Museum of Minnesota
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    Make a quick and easy filter from household materials. A filter will catch any solids suspended in a liquid and filter them out. By using a filter, learners can discover amazing things. Try...

    1 cent - $1 per student Ages 4 - 8 5 to 10 minutes
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    Science Museum of Minnesota
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    How many colors make black? Gather as many water soluble black markers as you can find. You will be amazed as black magically turns into vibrant purples, blues, greens, magenta, and more with just...

    1 cent - $1 per student Ages 4 - 18 10 to 30 minutes
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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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