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    NISE Network
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    In this activity, learners discover that nanoparticles of gold can appear red, orange or even blue. They learn that a material can act differently when it’s nanometer-sized. Use this activity to...

    Over $20 per group Ages 4 - adult 5 to 10 minutes
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    The Exploratorium
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    In this optics activity, learners explore why the sky is blue and the sunset is red, using a simple setup comprising a transparent plastic box, water, and powdered milk. Learners use a flashlight...

    $1 - $5 per group Ages 8 - 14 30 to 45 minutes
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    The Exploratorium
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    In this activity, learners explore why the sky is blue. Learners model the scattering of light by the atmosphere, which creates the blue sky and red sunset, using a flashlight and clear glue sticks...

    $1 - $5 per student Ages 8 - 14 5 to 10 minutes
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    Community Science Workshop Network
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    In this activity, learners build inexpensive kaleidoscopes using transparency paper and foil (instead of mirrors). Use this activity to introduce learners to concepts related to optics, light,...

    $1 - $5 per student Ages 8 - 14 10 to 30 minutes
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    Colorado State University
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    This simple hands-on activity demonstrates why the sky appears blue on a sunny day and red during sunrise and sunset. Learners observe as a special "sunset egg" and a white light reveal...

    $1 - $5 per student Ages 8 - 14 5 to 10 minutes
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    Colorado State University
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    This is a quick activity/demonstration that introduces learners to the concept of index of refraction. Learners place stirring rods in a jar of water and notice they can see them clearly. They will...

    1 cent - $1 per group Ages 8 - 18 Under 5 minutes
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    The Exploratorium
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    In this STEAM activity, learners create a "pixel tube" to explore reflections of light and color mixing. This device, made of rolled up shiny materials inside of a carboard tube, allows...

    $5 - $10 per group Ages 4 - 14 10 to 30 minutes