Post-lecture emails to students

A few days ago, I came across the following blog post by Dr. Brokk Toggerson, a physics lecturer from the University of Massachusetts, Amherst: 

"Reflections on Physics 132 Spring ’22 Part II – Something that has been evolving for a few semesters: After-class broadcasts"

This post really resonated with me, and I am glad to share it on my own Physics Education blog along with a few comments of mine. I started following a similar approach back when I was a teaching assistant for various physics, mathematics and computer science courses during my undergraduate and graduate studies, and to this day I am strongly convinced that this is a great way to enhance the students' learning experience. Personally, I think that this approach is applicable both for large enrollment courses (such as Dr. Toggerson's 600-student lecture) and smaller classes.      

"Any questions? No? Great, let's move on." -- Wait time and awkward silence in the classroom

I have no doubt that every educator is familiar with the following situation:

 "Are there any questions?"

"What is a harmonic oscillator?"

 "What is the difference between a metal and an insulator?"

etc.

We ask an (open-ended) question to engage our students and start looking around at their faces in the lecture hall or classroom. Most students seem to look down at their desk or simply stare into space. After what feels like eternity, we decide to break the awkward silence and answer the question ourselves -- or, in the case of the "Are there any questions?"-question, we would say something along the line of "No? Great, let's move on to the next chapter."