It was the birth of what we know as the personal computer now: It had a screen, a keyboard, a mouse, and a graphical interface -- the very first time all four of these came together in the same machine. Honestly, if the thing had been capable of rendering full color boobs PC evolution could have just stopped right then. And this happened in freaking 1973. Almost a decade before the first Mac would hit store shelves.
But that's just the tip of the iceberg.
Basically everything you're using to read this article, and the devices that most of your lives revolve around, can be credited to a building full of geniuses in Palo Alto, California. It was the Xerox PARC (Palo Alto Research Center), which was set up four decades ago to think up ways to make computers actually useful to the average person, rather than being huge, bulky machines that ran on diesel fuel.
Here's a short but fucking startling list of things that PARC invented:
1. Graphical user interfaces, so you could finally look at something other than letters on your computer screen;
2. Laser printers, for printing things that weren't blocky pieces of shit;
3. Computer-generated bitmap images, which eventually led to video animation, the precursor to GIFs of skateboarders crushing their nuts on handrails;
4. WYSIWYG (What You See Is What You Get) text editors, which let you see what your text documents actually looked like as you typed them. Before this, you literally could not see what you were typing until you printed it;
5. Object-oriented programming, which meant that you could add features to a program without rewriting the whole thing.
It was the birth of a bold new era in masturbation.