> My science teacher once insisted rivers couldn't flow north because on a globe, north is up.

That one seems to be common, oddly enough:

http://machall.com/view.php?date=2005-04-06

EDIT: After doing some web searches, it seems that this myth, just like robocalls, is also a uniquely U.S. phenomenon, possibly caused by the fact that U.S. geography causes many (possibly most) U.S. rivers to run southwards, even though contrary examples (even within the U.S.) are legion.

> My science teacher once insisted rivers couldn't flow north because on a globe, north is up.

Did he just not consider, say, the Nile?

Or the Rhine. Maybe there is no north bound river where the GP lived?

The closest large one I’m aware of is the Maumee, and that’s a few hours away.

We pointed out the Nile on the globe. Even that wasn’t convincing apparently.