On Dec 9, 1968, the American engineer Douglas Engelbart (1925-2013) gave a computer demonstration. In 90 minutes, Engelbart demonstrated the use of graphics, windows, hypertext, command input, video conferencing and even the computer mouse.
This presentation was one of most important ones in the history of computing and is actually known as “The Mother of all Demos”. It showed many aspects of computing as it is known today and established Engelbart as a true icon of computing.
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By Michael Hicks from Saint Paul, MN, USA (img_7820) [CC BY 2.0 (http://creativecommons.org/licenses/by/2.0)], via Wikimedia Commons