The How of Happiness: A Scientific Approach to Getting the Life You Want

by Sonja Lyubomirsky

Thus the key to happiness lies not in changing our genetic makeup (which is impossible) and not in changing our circumstances (i.e., seeking wealth or attractiveness or better colleagues, which is usually impractical), but in our daily intentional activities.

Human happiness, like height or temperature or IQ, lies on a continuum, a numerical scale that ranges from very, very low to very, very high.