I’m past the point of being able to hear most of it. We have neighbors with one of those high pitched devices to keep teens from loitering: my teens were driven crazy but I couldn’t hear at all.

But my ex is a teacher and I went to see her new classroom. The WiFi had a high pitched whine that drove me crazy yet she couldn’t hear it. I tried to get her to do something about it because I don’t see how anyone can learn with that, especially since students can hear so much better than I.