Their unwillingness to consider almost any conservative sites for listing not only illustrates their biased leftwing perspective, it also shows us their deep-seated close-mindedness. They believe in liberalism/socialism/big government so much they make it a point to refuse to even read opposing sites, no less deny access to them.
The story includes some nice history behind the invention of the GUI.
Interestingly, I could probably count on one hand the times I have double-clicked on a computer, since I rarely use the mouse at all. Instead, I have found it is far faster to use the keyboard to access commands, files, programs, etc.