And perhaps there was a back button on the video?

(This is not to ding you for this, but to acknowledge that you are helping to make an important point for our times.)

I've been amazed and depressed to find that CS majors in major universities have vaguely heard of Doug Engelbart but virtually none have taken the trouble to type "Engelbart" into Google and follow up on the first 5 hits. (Depressing, because we put in a lot of effort back when things were much more difficult to get most people in the world within a few typed characters and button clicks of most of the important ideas and knowledge in the world -- but ... ?????)