The invention of the computer mouse by Douglas Engelbart (November 17) took place on November 17, 1968. On this day, Douglas Engelbart and his team at the Stanford Research Institute introduced the first operational computer mouse. This small handheld device allowed users to control a cursor on a computer screen, marking a major milestone in human-computer interaction. The original mouse was a small wooden box with two metal wheels, designed as an innovative tool to make working with computers easier. This invention was demonstrated during a public presentation later known as "The Mother of All Demos," where Engelbart and his colleagues showcased the mouse alongside other pioneering technologies such as text editing and video conferencing. The invention of the computer mouse had a profound impact on the development of information technology and user interface design. It quickly became an essential component of personal computers and graphical environments. This date was designated in the Gregorian calendar to commemorate the historical significance of the mouse’s invention and Douglas Engelbart’s pivotal role in advancing computer science, serving as a reminder of technological progress and innovation in the 1960s.