Levels: Grades 2-6
Topics: eyes, vision, biology
Description: No materials are required for this online experiment from the Little Shop of Physics -- just endurance. Stare at the flag of cyan, black, and yellow for thirty seconds. Then look at a white surface and view the "afterimage" of an American flag in its proper colors. The experiment is an easy way to explore how the eyes function.
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Article by Cara Bafile
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