On the evening of October 29, 1969 the first data travelled between two nodes of the ARPANET, a key ancestor of the Internet. Even more important, this was one of the first big trials of a then-radical idea: Networking computers to each other. The men who symbolically turned the key on the connected world we know today were two young programmers, Charley Kline at UCLA and Bill Duvall at SRI in Northern California, using special equipment made by BBN in Cambridge, Massachussetts.