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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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    American Association for the Advancement of Science
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    Learners estimate how many small triangles will fill a larger shape. Then they use a triangle stamp (or stencil made from a file folder) to fill the larger shape with triangles. This activity is...

    $1 - $5 per student Ages 8 - 11 10 to 30 minutes
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    NISE Network
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    "Exploring the Universe: Filtered Light" demonstrates how scientists can use telescopes and other tools to capture and filter different energies of light to study the universe. Most...

    1 cent - $1 per student Ages 6 - 14 5 to 10 minutes
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    Twin Cities Public Television
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    This is an activity (located on page 3 of PDF under Hockey Sticks Activity) about composites, materials made of 2 or more different components. Learners will be challenged to build the best mud...

    $1 - $5 per group Ages 8 - 14 1 to 7 days