daniel_i_l
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How come standing outside in cold weather makes my nose run?
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Why Does Cold Weather Make My Nose Run?
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[guess]Perhaps the tissues in your respiratory tract generate mucus to protect themselves from the cold temperatures (a little layer of insulation). Given the quantity of mucus that the body produces it must be one of the most useful substances in the world![/guess]
Danger
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Because if it walked, it would be outside too long... 
Invictious
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Danger said:Because if it walked, it would be outside too long...
Haha very humurous, it will get detached from the coldness!
As DaleSpam said, your nose will create a layer of mucus as insulation (before your nose starts cracking), and then it starts dripping out...creating symptoms similar to rhinorrhea...