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Why is it that when you yawn your eyes tear up?

I often wondered what yawning and tearing eyes have in common. It doesn't make sense. With your mouth wide open, you breath in deeply, filling your lungs with air and then exhale............why would your eyes tear up........

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Abhijith Bob Babu (aj's) says

7 years ago
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Barbara C (Suki C) says

6 years ago
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