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 ca… - Malcolm Gladwell

It is those who are successful, in other words, who are most likely to be given the kinds of special opportunities that lead to further success. It’s the rich who get the biggest tax breaks. It’s the best students who get the best teaching and most attention. And it’s the biggest nine-and ten-year-olds who get the most coaching and practice. Success is the result of what sociologists like to call “accumulative advantage.

For half the young men, that was it. They were the control group. For the other half, there was a catch. As they walked down the hallway with their questionnaire, a man — a confederate of the experimenters — walked past them and pulled out a drawer in one of the filing cabinets. The already narrow hallway now became even narrower. As the young men tried to squeeze by, the confederate looked up, annoyed. He slammed the filing cabinet drawer shut, jostled the young men with his shoulder, and, in a low but audible voice, said the trigger word: “Asshole.” Cohen and Nisbett wanted to measure, as precisely as possible, what being called that word meant. They looked at the faces of their subjects and rated how much anger they saw. They shook the young men’s hands to see if their grip was firmer than usual. They took saliva samples from the students, both before and after the insult, to see if being called an asshole caused their levels of testosterone and cortisol — the hormones that drive arousal and aggression — to go up. Finally they asked the students to read the following story and supply a conclusion: It had only been about twenty minutes since they had arrived at the party when Jill pulled Steve aside, obviously bothered about something. “What’s wrong?” asked Steve. “It’s Larry. I mean, he knows that you and I are engaged, but he’s already made two passes at me tonight.” Jill walked back into the crowd, and Steve decided to keep his eye on Larry. Sure enough, within five minutes, Larry was reaching over and trying to kiss Jill. If you’ve been insulted, are you more likely to imagine Steve doing something violent to Larry?

A study at the University of Utah found that if you ask someone why he is friendly with someone else, he’ll say it is because he and his friend share similar attitudes. But if you actually quiz the two of them on their attitudes, you’ll find out that what they actually share is similar activities. We’re friends with the people we do things with, as much as we are with the people we resemble. We don’t seek out friends, in other words. We associate with the people who occupy the same small, physical spaces that we do.