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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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    University of Washington
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    In this activity (1st on the page), learners find their blind spot--the area on the retina without receptors that respond to light. Learners can draw their own blind spot testers, use the provided...

    1 cent - $1 per group Ages 8 - 18 10 to 30 minutes
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    Howard Hughes Medical Institute
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    In this experiment with planaria (a type of flatworm), learners will investigate the capability of different body sections to regenerate. When a planaria’s head is cut off, the remaining tail...

    $5 - $10 per student Ages 11 - 18 1 to 4 weeks
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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 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 Washington
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    In this activity, learners investigate color vision as well as plan and conduct their own experiments. In "CLASS EXPERIMENT," learners discover that afterimages occur because of...

    $5 - $10 per group Ages 8 - 18 1 to 2 hours