Biologists often talk about the “ecology” of an organism: the tallest oak in the forest is the tallest not just because it grew from the hardiest acorn; it is the tallest also because no other trees blocked its sunlight, the soil around it was deep and rich, no rabbit chewed through its bark as a sapling, and no lumberjack cut it down before it matured. We all know that successful people come from hardy seeds. But do we know enough about the sunlight that warmed them, the soil in which they put down the roots, and the rabbits and lumberjacks they were lucky enough to avoid?

Our first impressions are generated by our experiences and our environment, which means that we can change our first impressions . . . by changing the experiences that comprise those impressions.

All good parents understand these three principles implicitly. If you want to stop little Johnnie from hitting his sister, you can’t look away one time and scream at him another. You can’t treat his sister differently when she hits him. And if he says he really didn’t hit his sister, you have to give him a chance to explain himself. How you punish is as important as the act of punishing itself.

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Criminals were people who operated outside social constraint. They were driven by their own dark impulses: mental illness, greed, despair, anger. Weisburd had been taught that the best way to understand why criminals did what they did was to understand who they were. “I call it the Dracula model,” Weisburd said. “There are people and they’re like Dracula. They have to commit crime. It’s a model that says that people are so highly motivated to commit crime, nothing else really matters.” Yet if criminals were like Dracula, driven by an insatiable desire to create mayhem, they should have been roaming throughout the 72nd. The kinds of social conditions that Draculas feed on were everywhere. But the Draculas weren’t everywhere. They were only on particular streets.

The conviction that we know others better than they know us — and that we may have insights about them they lack (but not vice versa) — leads us to talk when we would do well to listen and to be less patient than we ought to be when others express the conviction that they are the ones who are being misunderstood or judged unfairly.

We normally think of the expressions on our face as the reflection of an inner state. I feel happy, so I smile. I feel sad, so I frown. Emotion goes inside-out. Emotional contagion, though, suggests that the opposite is also true. If I can make you smile, I can make you happy. If I can make you frown, I can make you sad. Emotion, in this sense, goes outside-in.

learn better skills; and the next year, because they are in the higher groups, they do even better; and the next year, the same thing happens, and they do even better again. The only country we don’t see this going on is Denmark. They have a national policy where they have no ability grouping until the age of

If suicide is coupled, then it isn’t simply the act of depressed people. It’s the act of depressed people at a particular moment of extreme vulnerability and in combination with a particular, readily available lethal means.

We spend a lot of time thinking about the ways that prestige and resources and belonging to elite institutions make us better off. We don’t spend enough time thinking about the ways in which those kinds of material advantages limit our options.

Historians start with Cleopatra and the pharaohs and comb through every year in human history ever since, looking in every corner of the world for evidence of extraordinary wealth, and almost 20 percent of the names they end up with come from a single generation in a single country.

Pronin calls this phenomenon the “illusion of asymmetric insight.” She writes: The conviction that we know others better than they know us — and that we may have insights about them they lack (but not vice versa) — leads us to talk when we would do well to listen and to be less patient than we ought to be when others express the conviction that they are the ones who are being misunderstood or judged unfairly.