The original Ethernet specification was signed on this day in 1980. The fact that it has lasted 32 years is a statement of just how good the design was. Having lived through the Ethernet vs. Token Ring battle, and then the FDDI vs. Ethernet battle, the fact that Ethernet continued to evolve to take on higher speed and more convenient cabling while keeping compatible with drivers across a spectrum of Operating Systems is pretty amazing.
Trivia: I think that I've worked on all the different Ethernet media types: DIX coax (with vampire taps!), BNC coax, fiber optic, and twisted pair. Back in the 80's it didn't seem that the future would belong to Ethernet and TCP/IP, but both of those have scaled beyond what any of us expected. Yay, Ethernet!