Open your mouth wide, stretch the muscles of your jaw and upper body, take a slow breath in, and then exhale quickly. What have you done? You have yawned. Many animals, including humans, yawn. They do ...
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Ask the Doctors: The Reason for Yawning Still Being Researched
Dear Doctors: I have always liked how yawning feels and wondered what it's for. I just read there is new information about how yawning affects your brain. Do you know anything about that?
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