On this day in 1983, the US military Advanced Research Projects Agency Network (ARPAnet) changed the protocol it was using for communications between computers, adopting the Internet Protocol (TCP/IP). Given the ubiquity of the Internet now, this is a critical date. To be sure, there had been lots of work on inter-computer communication prior to 1 Jan 1983, but that was the day it was all put into place.
See the fine 1996 book by Katie Hafner and Matthew Lyon, Where Wizards Stay up Late: The Origins of the Internet, and the Internet Society’s history by Barry M. Leiner, Vinton G. Cerf, David D. Clark, Robert E. Kahn, Leonard Kleinrock, Daniel C. Lynch, Jon Postel, Larry G. Roberts, and Stephen Wolff.
I wonder what an original one of the buttons saying “I survived the TCP/IP transition” is worth these 25 years later.