Douglas Lenat trained computers to think the old-fashioned way

The two of them, Douglas Lenat and his wife Mary, were driving innocently along last year when the trash truck in front of them started to shed its load. Great! Bags of garbage bounced all over the road. What were they to do? With cars all round them, they couldn’t swerve, change lanes, or jam on the brakes. They would have to drive over the bags. Which to drive over? Instant decision: not the household ones, because families threw away broken glass and sharp opened cans. But that restaurant one would be fine, because there would be nothing much in it but waste food and styrofoam plates. He was right. The car lived.