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Why do we yawn?

Sulfux

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Answer down below why humans yawn without googling it!

(I already know the answer )​
 
Last edited by a moderator:
Because we are yet to find the ultimate question to the ultimate answer.
 
Because it is what the secret evil society that runs the world wants.
 
Contraction of pharyngeal muscles opens the Eustachian tubes which equalize air pressure between the middle ear and the external environment. Subtle differences in air pressure are what cause reflexive spontaneous yawning.
 
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