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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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    University of Washington
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    In this activity (17th on the page), learners investigate why you cannot see colors in dim light. With five pieces of paper of different colors in front of them, learners sit in the dark for about...

    $1 - $5 per group Ages 4 - 18 5 to 10 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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    The Exploratorium
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    Make a camouflage cut-out animal! Using patterned paper or magazine pictures from around the house, use your craft skills to make a paper animal that blends into its background.

    1 cent - $1 per student Ages 4 - 11 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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    NISE Network
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    In this story time program, young learners listen to the Dr. Seuss book "Horton Hears a Who." Learners use their eyes to look at small things using lenses and use their sense of smell to...

    Over $20 per group Ages 4 - 11 10 to 30 minutes