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So If You Put An Ice Pack On Your Head, You Won't Yawn?
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Here's something I bet you didn't know: You don't yawn because you're necessarily tired, you yawn to keep your brain cool, according to research. Your sinuses act like bellows to direct the air to your brain. That's fine, but then why don't you yawn when you're not tired? (HealthDay via Philadelphia Inquirer)
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