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    University of Washington
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    In this activity, learners calculate the width (horizontal diameter) of the blind spot on their retina. Learners make a blind spot tester using a piece of notebook paper. They use simple geometry...

    1 cent - $1 per student Ages 11 - 18 5 to 10 minutes
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    University of Minnesota
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    In this activity, learners discover that the human brain is highly adaptable. Learners try to toss beanbags at a target while wearing prism goggles. Learners collect and interpret data and then...

    $10 - $20 per group Ages 8 - 18 45 to 60 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, learners overlap the three primary colors to see how all other colors are made. This activity also explains how color can be explained by the subtraction of colors of light,...

    free Ages 11 - 18 10 to 30 minutes
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    WGBH
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    In this optics activity, learners build a spy tool to secretly view things over walls or around corners. Learners discover that the mirrors inside the periscope reflect light to help you see what&...

    $5 - $10 per student Ages 6 - 11 10 to 30 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