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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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    WGBH
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    In this activity, learners conduct an experiment to test how fast they can react. Learners try to catch a piece of paper with a ruler printed on it (or a ruler) as quickly as they can. Learners...

    free Ages 6 - 11 5 to 10 minutes
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    University of Washington
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    In this activity (6th on the page), learners investigate how photoreceptors in the eye (rods and cones) "adapt" to low light conditions. Learners sort similar bottle caps in a well-lit...

    free Ages 8 - 18 10 to 30 minutes
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    The Exploratorium
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    This online exhibit is a visual illusion in which a fuzzy blue dot disappears into a green background. The illusion is created by the tiny jittering movements that your eyes are continually making....

    free Ages 6 - 14 5 to 10 minutes
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    Oregon Museum of Science and Industry
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    This is an online activity where learners can virtually mix different colors of light or paint (you can switch between them) and see how the colors combine. It demonstrates how millions of colors...

    free Ages 6 - adult 5 to 10 minutes
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    University of Washington
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    In this quick activity/demonstration (5th on the page), learners explore depth perception. Learners look at an object in the distance, close one eye, hold up their finger in line with the object,...

    free Ages 6 - 18 Under 5 minutes
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    University of Washington
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    In this demonstration (18th on the page), learners conduct a simple test to explore how the cornea refracts light, which is further bent by the eye lens through a process known as accommodation....

    free Ages 8 - 18 Under 5 minutes
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    University of Washington
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    In this easy demonstration (3rd on the page), learners explore depth perception by conducting a test with two pencils. Learners hold the ends of two pencils, one in each hand at arm's-length...

    free Ages 4 - 18 Under 5 minutes
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    Science Museum of Minnesota
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    This online activity lets learners explore how computer programs called "CAPTCHAS" work to test whether you are a human or a computer. Learners will be tested with a series of visual...

    free Ages 6 - adult 5 to 10 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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