Patrick Guilfoile: Why people yawn
Yawning is a common yet odd phenomenon. Without warning, we open our mouths wide, and take in a large gulp of air.
Yet, in spite of how frequently we yawn, there hasn’t been a compelling understanding about this behavior until recently.
A common explanation for yawning is that it allows more oxygen to get to the brain.
Yet previous research showed this was not the case.
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