When are humans most happy? To gather data on this question, Matt Killingsworth built an app, Track Your Happiness, that let people report their feelings in real time. Among the surprising results: We're often happiest when we're lost in the moment.
For decades, politicians and economists believed that happiness is linked with macroeconomic factors in modern societies. As this view began to change over the past few years, researchers started wondering about what actually makes people happy.