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Plica Semilunaris

The Plica Semilunaris is in the corner of your eye. It’s a leftover part of a nictitating membrane seen in other mammals and vertebrates that acts as a third eyelid. Over time, humans have lost the use of this feature, but the Plica Semilunaris is the evidence we once had it.

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How You Can Find Evolution On Your Own Body
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