https://kidshealth.org/ChildrensWI/en/kids/nose-run.html
You may have heard the old joke: If your nose is running and your feet smell, you must be upside down! But did you ever wonder why your nose runs?
nose runfor kidschildrenwi
https://www.sciencealert.com/why-does-your-nose-run-when-it-s-cold
About 50-90 percent of people get a runny nose when it's cold.
nose runcoldsciencealert