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    Science Friday
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    In this activity, learners examine how colored lenses act like filters and absorb all colors of light except for the color of the lenses. Learners explore this phenomenon by making a cool pair of...

    $5 - $10 per student Ages 8 - 14 10 to 30 minutes
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    The Exploratorium
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    If you had a long tube with a 5 millimeter wide slit, would you see the entire Golden Gate Bridge? Of course not, but if you moved that slit back and forth rapidly, you might see how your brain...

    1 cent - $1 per student Ages 6 - 14 Under 5 minutes
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    The Exploratorium
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    In this activity, learners conduct a simple test to find their blind spot. This guide includes a variation of the main activity as well as instructions on how to find the approximate size of the...

    1 cent - $1 per student Ages 8 - 14 Under 5 minutes
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    University of Washington
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    In this activity (16th on the page), learners play a variation of the "I Spy" game to explore color. Learners work in teams with each team assigned a color. Learners are given 10 minutes...

    1 cent - $1 per group Ages 4 - 11 10 to 30 minutes
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    The Exploratorium
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    In this activity about light and refraction, learners discover how a lens creates an image that hangs in midair. A large Fresnel lens creates upside-down images of distant objects and right-side-up...

    $5 - $10 per student Ages 8 - 14 30 to 45 minutes
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    The Exploratorium
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    In this activity, learners create a simple “top” from a CD, marble and bottle cap, and use it as a spinning platform for a variety of illusion-generating patterns. Learners will use Benham's...

    $1 - $5 per student Ages 8 - 18 10 to 30 minutes
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    WGBH
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    This activity is designed to accompany the PBS documentary about African-American chemist "Percy Julian: Forgotten Genius." Learners look through two cups with small holes in them to...

    1 cent - $1 per group Ages 6 - adult 5 to 10 minutes
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    The Exploratorium
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    In this optics activity, learners discover that when they rotate a special black and white pattern called a Benham's Disk, it produces the illusion of colored rings. Learners experiment with...

    $1 - $5 per group Ages 8 - 14 10 to 30 minutes
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    The Exploratorium
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    Spin a short piece of PVC pipe that's been marked up, and watch a triangle appear. Enjoy this optical illusion from the Exploratorium's Science Snack series.

    free Ages 4 - 18 5 to 10 minutes
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    The Exploratorium
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    In this activity about light and perception, learners create pictures in thin air. Using a simple set up of a slide projector, slide, moveable screen or poster board, and a "wand",...

    1 cent - $1 per group Ages 8 - 14 10 to 30 minutes

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