I just learned something helpful about Zoom. If you have been using it, you know that pressing and holding the spacebar is supposed to let you speak. But sometimes it doesn't.

What I learned is that you have just done something special, such as changing the view or the volume, then the trick of pressing the space bar may not work. In my case, I then click on the Unmute button, which is unreliable and may not respond. By that time, people are shouting advice at me.

Everybody please remember that methods of unmuting may or may not be reliable, and give people a chance. You can assume that somebody whose face has become familiar knows what to do.