Science & technology

The first message is sent over ARPANET

29 October 1969

On the evening of 29 October 1969, a student programmer at the University of California, Los Angeles, Charley Kline, tried to log in to a computer at the Stanford Research Institute 560 km away, over the ARPANET, the experimental network funded by the US Defense Department's research agency. He typed 'L' and 'O' before the system crashed; he had meant to send 'LOGIN'. An hour later the full message was sent. By the end of the year four sites were linked. The network adopted TCP/IP on 1 January 1983 and grew into the Internet. Ray Tomlinson sent the first email on it in 1971.

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