This document summarizes a talk about the connections between intentional communities, happiness, and quality of life. It discusses how human behavior and feelings evolved to promote behaviors that help pass on genes, with happiness as an accidental byproduct. Intentional communities may help exercise "good mood apps" in the brain and avoid "bad mood apps" by providing a social structure more aligned with how humans evolved. A study of over 1,000 individuals in 170 intentional communities found high levels of life satisfaction, social support, and other measures of well-being and quality of life. The talk suggests intentional communities provide an environment that may avoid "discords" or mismatches with human nature that can cause mental health problems in modern societies.