X, the windowing system for Unix (and other OSs), based on when you count it from is 40 years old, and its still in use. As Wayland looks ready to take over...
With Wayland becoming more and more popular, it’s interesting to look at the around 40 year history of X.
That was much better than what I expected going in knowing only that it was a youtube video about the history of X. Informative and enjoyable.