by 
twotim221
ANSWERS: 4
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something to do with the water from your eyes wetting the mucus in your nose. since your tear ducts are actually connected to your nose, and throat valves. That's why when you hold your nose and blow, you can sometimes feel air comming out of you tear ducts
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it just does
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The tear ducts are interconnected with a few of our snot ducts. For example if you are somewhere where there's alot of dust being kicked up in the air odds are it's not only getting in your eyes but you are breathing it in as well. So if your eyes begin to water it triggers the snot ducts to open up, likewise if your nose is running to clean out that dust from your nostrils, a message is sent to the tear ducts, the body's way of killing two birds with one stone. I actually don't cry myself, but there have been times when my girlfriend was crying because she's a little crybaby, and sometimes I just can't take it so I punch her in the nose, well she says that makes her eyes tear up worse. So I looked into that and that's when I learned about the interchangeable ducts.
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The mucus sees the tears escaping and figure that, since everyone else is doing it, then they had better get going too.
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