“After 40 years, 30 million rules, 200 million dollars, 2000 person-years, and many promises, Cyc has failed to reach intellectual maturity, and may never will.”
Cyc spent 40 years, $200 million, and 30 million hand-written rules chasing general intelligence. Much of its early money came from military and intelligence sources. Outside the company, almost nobody used it. Hand-coding common sense did not work.