Augmented reality, computational physics, engaging students

Just in time for the weekend, here are a few brief items that contain interesting reads and food for thought on physics education: 

"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."