The cars have a big computer inside them, which acts sort of like a brain. This computer has the ability to learn and make small changes to itself in order to make itself better.  Before the cars are made, the computer is shown lots of images of cars, people, street signs, and other things, as well as driving in pretend roads, like playing a video game, except it's very realistic.  Every time it makes a mistake, it changes how it acts to try and avoid it.  Eventually, the car can tell what things are, and drive on real roads!
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