Facts

• While running tests for the first mouse, Mr. Engelbart and Bill English were also running test on a form of the mouse controlled by the knee. But the mouse "beat out" the device controlled by the knee but only by a small margin.
• The invention of the mouse was "a result of analyzing the various characteristics of other pointing/input devices" as Douglas Engelbart said in an interview.
• Engelbart himself didn't patent the mouse, SRI (Stanford Research Institute) patented it and then sold it to Apple for a measly $40,000.00
• The mouse's motions typically translate into a pointer (unless changed by the user) which allows for fine motions in Graphical User Interface