I think I'm smart, and I know I was a good mom. But there wasn't a lot I could point to and say, that's why I'm special.

A movement starts because of the social habits of friendship and the strong ties between close acquaintances. It grows because of the habits of a community, and the weak ties that hold neighborhoods and clans together. And it endures because a movement's leaders give participants new habits that create a fresh sense of identity and a feeling of ownership.

Typically, people who exercise start eating better and becoming more productive at work. They smoke less and show more patience with colleagues and family. They use their credit cards less frequently and say they feel less stressed. It's not completely clear why. But for many people, exercise is a keystone habit that triggers widespread change.

Willpower isn’t just a skill. It’s a muscle, like the muscles in your arms or legs, and it gets tired as it works harder, so there’s less power left over for other things.

Some say because music is as much about personal expression as listening pleasure, sharing is integral to why songs have value in the first place.

America is the Saudi Arabia of coal.

Companies aren’t families. They’re battlefields in a civil war.