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        Ask a Scientist: What is an Optical Illusion?

        This video features Dr. Matt McMahon discussing optical illusions and how they play tricks on our eyes. In the National Eye Institute Ask a Scientist video series, NEI scientists answer questions from kids about vision, optical illusions, science careers, and more.  If you or your children have questions to ask our scientists, tell us on Twitter! You can tweet your questions to @NatEyeInstitute with the hashtag #AskAScientist.

        https://nei.nih.gov/kids

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