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Why do humans have a third eyelid? - Dorsa Amin

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TEDEd Animation

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You know that little pink thing nestled in the corner of your eye? It’s actually the remnant of a third eyelid. In humans, it’s vestigial, meaning it no longer serves its original purpose. There are several other vestigial structures in the human body, quietly riding along from one of our ancestor species to the next. But why have they stuck around for so long? Dorsa Amir investigates.

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TED-Ed Animations feature the words and ideas of educators brought to life by professional animators. Are you an educator or animator interested in creating a TED-Ed Animation? Nominate yourself here »

Meet The Creators

  • Educator Dorsa Amir
  • Director Avi Ofer
  • Narrator Addison Anderson
  • Animator Avi Ofer
  • Illustrator Avi Ofer
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Lesson completed

Why do humans have a third eyelid

Because it will help people see better

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Lesson in progress

NO! Your wrong! it keeps dust and debris out of your eyes I disagree

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