When Martin Seligman founded positive psychology in the late 1990s, one of his first moves was to bring together small groups of experts to tackle specific problems. One group was created to study the externals that matter for happiness. Three psychologists, Sonja Lyubomirsky, Ken Sheldon, and David Schkade, reviewed the available evidence and realized that there are two fundamentally different kinds of externals: the conditions of your life and the voluntary activities that you undertake.33 Conditions include facts about your life that you can’t change (race, sex, age, disability) as well as
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