 In 1966, Stanford University student Bill Pitts, who had a hobby of exploring the steam tunnels and buildings of the campus, broke into a building he found out to be the location of the Stanford Artificial Intelligence Project, which held a DEC PDP-6 time-sharing computer system with 20 Teletype consoles connected to it.Fascinated by the computer and having taken several introductory computer classes, Pitts convinced the head of the project, Lester Earnest, to let him use the computer after hours.Soon, Pitts had ceased going to classes, instead spending his nights in the computer lab interacting with the graduate and postgraduate students and playing "Spacewar" on the PDP-6.