The broaden-and-build theory of positive emotions stems from a set of twin hypotheses. First, the broaden hypothesis proposes that positive emotions momentarily expand our perception of the world in ways that facilitate global visual processing, better attentional flexibility, and larger thought-action repertoires. The build hypothesis purports that, over time, these fleeting experiences of expanded awareness that accompany positive emotions such as joy and excitement accumulate over time to facilitate growth of a person's social, cognitive, emotional, and physical resources. Empirical evidence supporting these hypotheses is discussed, as well as the theory's implications for behavior, psychological resilience, social interaction, and health.