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    The Exploratorium
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    This is an online exhibit about color perception. Learners set a random background color and then try to mix red, blue, and green light to match. Although this is a perception activity, it also...

    free Ages 6 - 18 5 to 10 minutes
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    Oregon Museum of Science and Industry
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    This display shows slow chemical reactions in colorful crystal formations known as Liesegang Rings. These reactions are similar to those forming the rings in agates. This activity is recommended...

    $5 - $10 per student Ages 14 - adult 1 to 4 weeks
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    Oregon Museum of Science and Industry
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    Learners place their hands on different metals and use an ammeter to monitor the flow of electricity from one metal to another. They become part of a complete circuit, allowing electrons to flow...

    $10 - $20 per group Ages 8 - 18 5 to 10 minutes
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    Oregon Museum of Science and Industry
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    This is written as a static display, but can easily be adapted to a hands-on experiment for learners to conduct. Sodium phosphate, a clear colorless solution, is combined with six different metal...

    $5 - $10 per group Ages 11 - adult 10 to 30 minutes
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    The Exploratorium
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    In this optics activity, learners discover that not all shadows are black. Learners explore human color perception by using colored lights to make additive color mixtures. With three colored lights...

    $5 - $10 per group Ages 6 - 18 5 to 10 minutes
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    The Exploratorium
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    In this fun and interactive online exhibit, the straight lines of a tile wall appear to curve. The learner moves the rows of tiles and changes the color of the grout to achieve the intriguing...

    free Ages 4 - 18 5 to 10 minutes
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    The Exploratorium
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    In this fun optics activity, learners explore principles of light, reflection (mirrors), and perception. Learners work in pairs and sit on opposite sides of a "two-way" mirror. Both...

    Over $20 per group Ages 6 - 18 10 to 30 minutes
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    Oregon Museum of Science and Industry
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    Learners observe working lava lamps to understand how they work (included in PDF link). Learners discover that liquids may not be miscible, or won't mix together, because of differences in...

    $10 - $20 per group Ages 8 - adult 10 to 30 minutes
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    Lawrence Hall of Science
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    This is a guide for facilitating interaction at a touch tank with marine animals. The instructions are for setting up a display in an informal science center, but could work anywhere. Both...

    $1 - $5 per group Ages 4 - adult 10 to 30 minutes
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    Oregon Museum of Science and Industry
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    Learners observe two joined glass tubes containing a conductive salt solution. Electrodes are passing an electric current through the water. Oxygen gas is formed in the tube connected to the...

    $10 - $20 per group Ages 11 - adult Under 5 minutes

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