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About one in every 100 people doesn’t care what others think of him. These people are hard to spot. They are usually physically healthy, and their intelligence is often above average. Yet, in the words of one psychiatrist, they lie without compunction, cheat, steal, and casually violate any and all norms of social conduct whenever it suits their whim. They have no concern for others’ suffering, no remorse when caught, and punishment does little to change them. They are called psychopaths.