Thoughts
"Are there any questions?" can be such a crutch. Confused people aren't good at asking questions.
I had one teacher who would ask, "is anybody lost?" Intro chemistry, 150+ people in the classroom. Someone would nod or raise their hand, and he'd point at them and ask "Where did I lose you?" It was unreasonably effective. You lose people in weird places, and oftentimes going back and connecting topics is more effective and more helpful than re-explaining them.