I hear it from older people, mostly. “Oh, I know about quantum physics, it’s about how everything is connected!” “String theory: that’s the one that says everything is connected, right?” “Carl Sagan said we are all stardust. So really, everything is connected.” I always cringe a little when I hear this. There’s a misunderstanding here, but it’s not a nice clean one I can clear up in a few sentences. It’s a bunch of interconnected misunderstandings, mixing some real science with a lot of confusion.