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Learn · Why do humans have a third eyelid?

Talk5 min

Why do humans have a third eyelid?

Dorsa Amir · TED

At TED

Credits and licence

From
Why do humans have a third eyelid?, TED (at TED)
Licence
CC BY-NC-ND 4.0, as TED states it. Non-commercial use only, and no changed versions.
Attribution
TED Talks are licensed by TED under Creative Commons BY-NC-ND 4.0 International and are shown here in TED's own player, as TED's usage policy asks.
Who can watch
Teens profiles and older. How courses are placed