YOUTUBE VIDEO TIP

You can play any video as audio only.

Just add to youtube url:
&listen=true

For example:

https://yewtu.be/watch?v=8_wpcmpPhZ4&listen=true <---- add this part

Helps for listening or minimizing distraction during presentations.

Technical Reasons:
- save bandwidth
- less disposable bits (when you close bits disappear)
- save processing power / heat generation

WHY I SAY THIS?
The example video shows just a face who doesn't have much expression or animation so it makes sense after having a look initially to switch to audio or if your browser is slow with many videos open or buggy just reduce demand overall.