Criticism is a privilege that you earn — it shouldn’t be your opening move in an interaction… - Malcolm Gladwell

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.

All war is absurd. For thousands of years, human beings have chosen to settle their differences by obliterating one another. And when we are not obliterating one another, we spend an enormous amount of time and attention coming up with better ways to obliterate one another the next time around. It’s all a little strange, if you think about it.

Living a long life, the conventional wisdom at the time said, depended to a great extent on who we were — that is, our genes. It depended on the decisions we made — on what we chose to eat, and how much we chose to exercise, and how effectively we were treated by the medical system. No one was used to thinking about health in terms of community.