THE GOAL IN HACKING is to find a weak point in a system and then exploit that vulnerability. In psychological warfare, the weak points are flaws in how people think. If you’re trying to hack a person’s mind, you need to identify cognitive biases and then exploit them. If you walk up to a random person on the street and ask, “Are you happy?” the chances are high that she will say yes. If, however, you walk up to that same person and first ask, “Have you gained weight in the last few years?” or “Are any people from your high school more successful than you?” and then you ask “Are you
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