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In this activity about vision and optical illusions, learners conduct a simple test to demonstrate how our eyes create "afterimages." Learners stare at a black cardboard bat for at least 30 seconds an

1 cent - $1 per student Ages 8 - 18 Under 5 minutes
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This activity is a fun way to show two stages in a Monarch butterfly's life cycle. Learners will create an optical illusion that can be flipped from caterpillar to butterfly.

1 cent - $1 per student Ages 4 - 8 10 to 30 minutes