At 10:30 PM, computer science student Charley Kline attempted to transmit the word 'LOGIN' from a UCLA computer to a Stanford Research Institute machine 350 miles away. The system crashed after the letters 'L' and 'O' went through, producing an accidental but fitting first message: 'LO'. The connection was fixed within the hour, marking the birth of the network that would evolve into the internet.
The setup was almost comically fragile by modern standards. Two bulky Interface Message Processors, each the size of a refrigerator, sat at UCLA and SRI, connected by a leased telephone line. Kline, a 21-year-old graduate student working under professor Leonard Kleinrock, wore a telephone headset connected to a colleague at SRI so the two could talk through each step of the transmission in real time.
Kline typed 'L', and his SRI counterpart confirmed it arrived. He typed 'O', confirmed again. Then the SRI system, anticipating the rest of the command and trying to auto-complete it, crashed. The full word 'LOGIN' finally went through about an hour later once the glitch was fixed.
No one popped champagne or thought they were witnessing history; it was routine debugging for an obscure Pentagon-funded research project called ARPANET, designed to let scattered research computers share processing time. Kleinrock kept the logbook recording the exact minute in a drawer for decades before it became a treasured artifact, evidence of the first flicker of the network that would eventually connect billions of devices worldwide.