Some people don’t experience stress. Are they happier?

For eight days in a row, participants at each wave of the midlife study spoke to a researcher over the phone about their day. Respondents shared whether or not they experienced any stressors, such as getting into an argument with a friend or having a problem at work—the kinds of stressors that aren’t life-threatening but can be disruptive. Charles dug into these surveys, wanting to learn from the answers how different people react to and handle stress. But she kept having to throw out a small portion of the data.