R.I.P. Douglas Engelbart.
Here is a Playlist with the Higlights of his 1968 Demo, The Dawn of Interactive Computer
Douglas Carl Engelbart (January 30, 1925 - July 2, 2013) was an American inventor, and an early computer and internet pioneer. He is best known for his work on the challenges of human–computer interaction, particularly while at his Augmentation Research Center Lab in SRI International, resulting in the invention of the computer mouse, and the development of hypertext, networked computers, and precursors to graphical user interfaces.