system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: why do our noses get runny after spending time outside in chilly weather? (Is it related to having a cold)?
gpt
Hey hon!

You know how, when you put your hand in really hot water, you pull away real fast cause it felt super hot? It's cause water is really good at making things super hot or super cold really fast. Our noses do this too.

If your lips get too dry, sometimes it can crack and hurt a lot, right? We really don't want that to happen inside us, so we have to keep our insides wet.

When it's really cold out, the water in our noses run out really quickly. This is no good, so our noses decide to make a ton more!

This is great, lots of wetness, but it's a little too great, which gets bad. There's no rulers or measuring clocks in our noses. Once it gets started, it works too hard. Now we have all this water overflowing, like when we pour too much water in the sink and it goes over the sides.

That's your runny nose.