Some extract more energy from the environment than others; some reproduce more than others; some are more curious, creative, clever, or practical than others. But the third consequence of our animalness is that large groups of humans, as opposed to individual humans, are all much the same. If you pluck two random people from a crowd, they may be as different as can be imagined, but if you round up two complete crowds they will tend to mirror each other rather closely. And if you compare groups millions strong, as I do in this book, they are likely to have very similar proportions of energetic,
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