system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: when one has a cold, how does snot keep regenerating even shortly after blowing one's nose?
gpt
You've got eight sinuses connected by nasal passages, spread out over the whole top half of your face, and they can all produce and store snot. So, after you've blown your nose, more snot just runs down from another sinus, and you have to blow your nose again almost immediately. Repeat until you've cleared all four pairs of sinuses. Your mucous membranes can produce watery stuff relatively quickly, which dilutes the snot and helps it run faster, and also adds to the volume of stuff you're sneezing out.

There's also a psychological factor- you're not actually blowing out as much snot as it feels like with each sneeze. Same as how when you have a nosebleed or a papercut, it can feel like you're losing gallons of blood- but actually if you put it all in a shotglass you'd realize it's a pretty small amount. This principle also applies to certain other bodily emissions, whose volume men tend to greatly overestimate...