All around, I think I'm a pretty bright girl. I read newspapers. I do crossword puzzles. I watch Jeopardy and can get about half of the answers right in the first round and at least a few in the second. I know stuff.
But there is one thing that I can't believe I, a capable human adult, have not learned. I have no idea why my nose runs when it's cold. Not a clue. I know why it runs when I cry. I know why it runs when I eat spicy foods. When I'm sick, I can say, "Well, my nose is running and it is very uncomfortable yet I still have the presence of mind to know why it is running." But cold? Nope. No idea.
I asked a guy I was dating once about it and he was all, "Eww. Gross. Why do you think about these things?" all condescending-like and all I could think was "Seriously, dude, if you don't know just say so."
We broke up shortly afterward for obvious reasons.