History was made on October 29, 1969.
On this day, the first packet-switching network transmitted information between UCLA and SRI, in what was then known as ARPAnet, a project of the Advanced Research Projects Association, or ARPA.
In today's black box society, it's difficult to give just one person the credit for such an important milestone. Vinton Cerf was largely responsible for the logistics, but Leonard Kleinrock researched the theoretical math that made the data transmission possible. Of course, after some twenty years of being a wonky academic service, Tim Berners-Lee germinated the Worldwide Web at the particle physics labs of CERN. Each of these fine gentlemen also had help.
To all those at ARPA and CERN, to all those at the ISP's and telecom companies that make this wonderful and wonderfully uncertain world possible, Happy 40th Birthday.