A: Palo Alto, California, United States
In 1970 Xerox opened the Palo Alto Research Center (PARC). PARC became the incubator of the Graphical User Interface (GUI), the mouse, the WYSIWYG text editor, the laser printer, the desktop computer, the Smalltalk programming language and integrated development environment, Interpress (a resolution-independent graphical page description language and the precursor to PostScript), and Ethernet.