Why do nation yawn? i stipulation the proven motivation?
Answers: If the amount of oxygen contained by your bloodstream drops to a lower than normal stratum a yawn opens your airways allowing more nouns, and therefore more oxygen into your lungs . This like greased lightning restores your oxygen level to run of the mill.
Ian M
I once heard that yawning sends oxygen to your brain. I don't know if that's true, but that's what I hear.
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