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    BioEd
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    In this activity, learners estimate risks associated with different events and compare their estimates to the real possibilities. Use this activity to investigate how chemicals influence the...

    1 cent - $1 per group Ages 11 - 14 45 to 60 minutes
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    The Exploratorium
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    In this quick optics activity, learners use a dim point of light (a disassembled Mini MagLite and dowel set-up) to cast a shadow of the blood supply in their retina onto the retina itself. This...

    $1 - $5 per student Ages 8 - 14 Under 5 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! <b>[Activity is publicly available through a web...

    1 cent - $1 per student Ages 6 - 18 10 to 30 minutes
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    New York Hall of Science
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    This is an activity about our sense of smell and how it compares to sharks' super noses. Learners will create varying solutions of water and perfume. Can you smell a single drop of perfume in...

    1 cent - $1 per student Ages 6 - 11 10 to 30 minutes
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    WGBH
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    In this artistic activity, learners blow up a smaller picture into a larger one, by using a grid. The activity prompts students to think about how their eyes and brain work together to make sense...

    1 cent - $1 per group Ages 6 - 11 30 to 45 minutes
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    Twin Cities Public Television
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    In this activity (on page 2 of the PDF under GPS: Light and Color Activity), learners will see the illusion of colors produced by a rotating black and white image known as Benham’s Disk. They will...

    $1 - $5 per group Ages 8 - 14 45 to 60 minutes
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    Lawrence Hall of Science
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    Learners will explore the concept of angular distance, and investigate why the moon appears to be the same size as the sun during a solar eclipse, despite the sun being much larger. Learners will...

    1 cent - $1 per group Ages 6 - adult 5 to 10 minutes