People do things, we say, “out of the blue,” “all of a sudden,” “out of nowhere.” These phrases support the popular myth that predicting human behavior isn’t possible. Yet to successfully navigate through morning traffic, we make amazingly accurate high-stakes predictions about the behavior of literally thousands of people. We unconsciously read tiny untaught signals: the slight tilt of a stranger’s head or the momentarily sustained glance of a person a hundred feet away tells us it is safe to pass in front of his two-ton monster. We expect all the drivers to act just as we would, but we still
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