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A yawn is a reflex action characterized by the opening of the mouth and a deep inhalation, often followed by a long exhalation. It is commonly associated with tiredness, boredom, or the need for increased oxygen intake. While the exact reasons for yawning are still debated, it is thought to help regulate brain temperature and alertness. Yawning can also be contagious, often prompting others to yawn in response.

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1d ago

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