What's something you just learned, that you should have known for a while?

https://lemmy.world/post/5566950

What's something you just learned, that you should have known for a while? - Lemmy.world

I just learned that in the sky there are things called contrails, and they are made by machines that fly high in the air called aeroplanes.
I told my nephew that’s how they make the isobar lines for TV News weather maps, but he didn’t believe me. Little dude’s awfully cynical for a six-year old.